/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/down.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 23:30:56,896 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 23:30:56,898 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 23:30:56,934 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 23:30:56,987 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 23:30:57,000 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 23:30:57,000 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 23:30:57,002 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 23:30:57,003 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 23:30:57,003 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 23:30:57,003 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 23:30:57,003 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 23:30:57,003 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 23:30:57,003 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 23:30:57,003 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 23:30:57,004 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 23:30:57,004 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 23:30:57,004 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 23:30:57,004 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 23:30:57,004 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 23:30:57,005 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 23:30:57,005 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 23:30:57,005 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 23:30:57,005 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 23:30:57,005 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 23:30:57,005 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-02 23:30:57,005 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 23:30:57,005 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-02 23:30:57,005 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 23:30:57,306 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 23:30:57,349 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 23:30:57,352 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 23:30:57,353 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 23:30:57,354 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 23:30:57,355 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/down.i [2021-05-02 23:30:57,439 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a57e43052/0a75662163254509bac0ee08dbfb4e60/FLAGeff174fc0 [2021-05-02 23:30:57,889 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 23:30:57,889 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/down.i [2021-05-02 23:30:57,895 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a57e43052/0a75662163254509bac0ee08dbfb4e60/FLAGeff174fc0 [2021-05-02 23:30:57,924 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a57e43052/0a75662163254509bac0ee08dbfb4e60 [2021-05-02 23:30:57,927 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 23:30:57,930 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 23:30:57,936 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 23:30:57,936 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 23:30:57,940 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 23:30:57,941 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:30:57" (1/1) ... [2021-05-02 23:30:57,942 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7ad68a0b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:30:57, skipping insertion in model container [2021-05-02 23:30:57,942 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:30:57" (1/1) ... [2021-05-02 23:30:57,948 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 23:30:57,962 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 23:30:58,095 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/down.i[893,906] [2021-05-02 23:30:58,108 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 23:30:58,115 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 23:30:58,124 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/down.i[893,906] [2021-05-02 23:30:58,128 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 23:30:58,173 INFO L208 MainTranslator]: Completed translation [2021-05-02 23:30:58,174 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:30:58 WrapperNode [2021-05-02 23:30:58,174 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 23:30:58,175 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 23:30:58,175 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 23:30:58,176 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 23:30:58,183 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:30:58" (1/1) ... [2021-05-02 23:30:58,183 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:30:58" (1/1) ... [2021-05-02 23:30:58,190 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:30:58" (1/1) ... [2021-05-02 23:30:58,190 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:30:58" (1/1) ... [2021-05-02 23:30:58,195 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:30:58" (1/1) ... [2021-05-02 23:30:58,202 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:30:58" (1/1) ... [2021-05-02 23:30:58,217 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:30:58" (1/1) ... [2021-05-02 23:30:58,220 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 23:30:58,222 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 23:30:58,222 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 23:30:58,222 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 23:30:58,222 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:30:58" (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 23:30:58,287 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 23:30:58,287 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 23:30:58,287 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 23:30:58,287 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 23:30:58,287 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 23:30:58,287 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 23:30:58,288 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 23:30:58,288 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 23:30:58,288 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 23:30:58,288 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 23:30:58,288 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 23:30:58,288 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 23:30:58,289 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 23:30:58,289 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 23:30:58,289 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 23:30:58,289 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 23:30:58,289 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 23:30:58,290 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 23:30:58,290 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 23:30:58,290 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 23:30:58,290 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 23:30:58,291 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 23:30:58,529 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 23:30:58,529 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 23:30:58,530 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:30:58 BoogieIcfgContainer [2021-05-02 23:30:58,530 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 23:30:58,532 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 23:30:58,532 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 23:30:58,534 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 23:30:58,534 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 11:30:57" (1/3) ... [2021-05-02 23:30:58,535 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7aefd88d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:30:58, skipping insertion in model container [2021-05-02 23:30:58,535 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:30:58" (2/3) ... [2021-05-02 23:30:58,535 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7aefd88d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:30:58, skipping insertion in model container [2021-05-02 23:30:58,535 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:30:58" (3/3) ... [2021-05-02 23:30:58,536 INFO L111 eAbstractionObserver]: Analyzing ICFG down.i [2021-05-02 23:30:58,540 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-02 23:30:58,543 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 23:30:58,555 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 23:30:58,573 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 23:30:58,573 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 23:30:58,573 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-02 23:30:58,573 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 23:30:58,573 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 23:30:58,573 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 23:30:58,573 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 23:30:58,573 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 23:30:58,597 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 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 23:30:58,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 23:30:58,602 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:30:58,603 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:30:58,603 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:30:58,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:30:58,607 INFO L82 PathProgramCache]: Analyzing trace with hash 991123303, now seen corresponding path program 1 times [2021-05-02 23:30:58,630 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:30:58,631 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [794834729] [2021-05-02 23:30:58,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:30:58,701 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:30:58,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:30:58,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:30:58,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:30:58,895 INFO 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 23:30:58,897 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:30:58,897 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [794834729] [2021-05-02 23:30:58,898 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [794834729] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:30:58,899 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:30:58,899 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 23:30:58,899 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270053368] [2021-05-02 23:30:58,902 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 23:30:58,902 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:30:58,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 23:30:58,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 23:30:58,912 INFO L87 Difference]: Start difference. First operand has 22 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 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 23:30:59,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:30:59,127 INFO L93 Difference]: Finished difference Result 43 states and 54 transitions. [2021-05-02 23:30:59,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 23:30:59,129 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 23:30:59,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:30:59,133 INFO L225 Difference]: With dead ends: 43 [2021-05-02 23:30:59,134 INFO L226 Difference]: Without dead ends: 18 [2021-05-02 23:30:59,137 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 137.8ms TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2021-05-02 23:30:59,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-05-02 23:30:59,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-05-02 23:30:59,168 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 23:30:59,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2021-05-02 23:30:59,170 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2021-05-02 23:30:59,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:30:59,171 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2021-05-02 23:30:59,171 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 23:30:59,171 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2021-05-02 23:30:59,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 23:30:59,172 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:30:59,172 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:30:59,172 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 23:30:59,172 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:30:59,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:30:59,174 INFO L82 PathProgramCache]: Analyzing trace with hash -1458852147, now seen corresponding path program 1 times [2021-05-02 23:30:59,174 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:30:59,174 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1191923129] [2021-05-02 23:30:59,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:30:59,222 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_6 v_main_~n~0_7) InVars {main_~i~0=v_main_~i~0_6, main_~n~0=v_main_~n~0_7} OutVars{main_~i~0=v_main_~i~0_6, main_~n~0=v_main_~n~0_7} AuxVars[] AssignedVars[] [2021-05-02 23:30:59,245 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:30:59,253 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:30:59,278 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:30:59,305 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:30:59,372 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:30:59,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:30:59,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:30:59,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:30:59,476 INFO 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 23:30:59,550 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:30:59,551 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1191923129] [2021-05-02 23:30:59,551 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1191923129] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:30:59,551 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:30:59,551 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-02 23:30:59,551 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992619482] [2021-05-02 23:30:59,552 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 23:30:59,552 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:30:59,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 23:30:59,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-05-02 23:30:59,553 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 23:30:59,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:30:59,932 INFO L93 Difference]: Finished difference Result 35 states and 39 transitions. [2021-05-02 23:30:59,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 23:30:59,933 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 23:30:59,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:30:59,934 INFO L225 Difference]: With dead ends: 35 [2021-05-02 23:30:59,934 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 23:30:59,935 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 377.6ms TimeCoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2021-05-02 23:30:59,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 23:30:59,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2021-05-02 23:30:59,941 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 23:30:59,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2021-05-02 23:30:59,942 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 14 [2021-05-02 23:30:59,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:30:59,942 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2021-05-02 23:30:59,942 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 23:30:59,942 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2021-05-02 23:30:59,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 23:30:59,943 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:30:59,943 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 23:30:59,943 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 23:30:59,943 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:30:59,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:30:59,944 INFO L82 PathProgramCache]: Analyzing trace with hash -1400088084, now seen corresponding path program 1 times [2021-05-02 23:30:59,944 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:30:59,944 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1068427001] [2021-05-02 23:30:59,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:30:59,948 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_10 v_main_~n~0_8) InVars {main_~i~0=v_main_~i~0_10, main_~n~0=v_main_~n~0_8} OutVars{main_~i~0=v_main_~i~0_10, main_~n~0=v_main_~n~0_8} AuxVars[] AssignedVars[] [2021-05-02 23:30:59,952 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:30:59,953 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:30:59,959 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:30:59,982 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:30:59,996 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:00,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:00,093 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:00,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:00,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:00,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:00,102 INFO 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 23:31:00,171 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:00,171 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1068427001] [2021-05-02 23:31:00,172 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1068427001] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:00,172 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:00,172 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-02 23:31:00,172 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865376263] [2021-05-02 23:31:00,172 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 23:31:00,172 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:00,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 23:31:00,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2021-05-02 23:31:00,173 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 23:31:00,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:00,576 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2021-05-02 23:31:00,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 23:31:00,576 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 23:31:00,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:00,577 INFO L225 Difference]: With dead ends: 41 [2021-05-02 23:31:00,577 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 23:31:00,578 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 395.0ms TimeCoverageRelationStatistics Valid=111, Invalid=489, Unknown=0, NotChecked=0, Total=600 [2021-05-02 23:31:00,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 23:31:00,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-05-02 23:31:00,582 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 23:31:00,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2021-05-02 23:31:00,582 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 22 [2021-05-02 23:31:00,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:00,583 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2021-05-02 23:31:00,583 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 23:31:00,583 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2021-05-02 23:31:00,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 23:31:00,583 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:00,583 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 23:31:00,583 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 23:31:00,583 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:00,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:00,584 INFO L82 PathProgramCache]: Analyzing trace with hash -1068960442, now seen corresponding path program 2 times [2021-05-02 23:31:00,584 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:00,584 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2043984553] [2021-05-02 23:31:00,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:00,588 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_15 v_main_~n~0_9) InVars {main_~i~0=v_main_~i~0_15, main_~n~0=v_main_~n~0_9} OutVars{main_~i~0=v_main_~i~0_15, main_~n~0=v_main_~n~0_9} AuxVars[] AssignedVars[] [2021-05-02 23:31:00,591 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:00,604 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:00,611 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:00,622 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:00,639 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:00,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:00,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:00,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:00,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:00,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:00,733 INFO 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 23:31:00,823 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:00,823 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2043984553] [2021-05-02 23:31:00,824 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2043984553] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:00,824 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:00,824 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-02 23:31:00,824 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256156122] [2021-05-02 23:31:00,824 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 23:31:00,824 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:00,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 23:31:00,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-05-02 23:31:00,825 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 23:31:01,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:01,212 INFO L93 Difference]: Finished difference Result 42 states and 45 transitions. [2021-05-02 23:31:01,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 23:31:01,213 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 23:31:01,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:01,213 INFO L225 Difference]: With dead ends: 42 [2021-05-02 23:31:01,214 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 23:31:01,214 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 392.0ms TimeCoverageRelationStatistics Valid=122, Invalid=580, Unknown=0, NotChecked=0, Total=702 [2021-05-02 23:31:01,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 23:31:01,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2021-05-02 23:31:01,218 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 23:31:01,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-05-02 23:31:01,219 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 23 [2021-05-02 23:31:01,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:01,219 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-05-02 23:31:01,219 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 23:31:01,219 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-05-02 23:31:01,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 23:31:01,220 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:01,220 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 23:31:01,220 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 23:31:01,220 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:01,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:01,220 INFO L82 PathProgramCache]: Analyzing trace with hash 606061868, now seen corresponding path program 3 times [2021-05-02 23:31:01,220 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:01,221 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [24434055] [2021-05-02 23:31:01,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:01,225 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_21 v_main_~n~0_10) InVars {main_~i~0=v_main_~i~0_21, main_~n~0=v_main_~n~0_10} OutVars{main_~i~0=v_main_~i~0_21, main_~n~0=v_main_~n~0_10} AuxVars[] AssignedVars[] [2021-05-02 23:31:01,227 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:01,243 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:01,248 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:01,265 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:01,278 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:01,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:01,368 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:01,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:01,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:01,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:01,375 INFO 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 23:31:01,473 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:01,473 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [24434055] [2021-05-02 23:31:01,474 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [24434055] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:01,474 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:01,474 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-02 23:31:01,474 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029228141] [2021-05-02 23:31:01,474 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 23:31:01,474 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:01,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 23:31:01,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 23:31:01,475 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 23:31:01,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:01,933 INFO L93 Difference]: Finished difference Result 43 states and 46 transitions. [2021-05-02 23:31:01,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 23:31:01,934 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 23:31:01,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:01,934 INFO L225 Difference]: With dead ends: 43 [2021-05-02 23:31:01,934 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 23:31:01,935 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 447.3ms TimeCoverageRelationStatistics Valid=133, Invalid=679, Unknown=0, NotChecked=0, Total=812 [2021-05-02 23:31:01,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 23:31:01,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2021-05-02 23:31:01,938 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 23:31:01,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2021-05-02 23:31:01,939 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 24 [2021-05-02 23:31:01,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:01,939 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2021-05-02 23:31:01,939 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 23:31:01,939 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2021-05-02 23:31:01,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 23:31:01,939 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:01,939 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 23:31:01,940 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-02 23:31:01,940 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:01,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:01,940 INFO L82 PathProgramCache]: Analyzing trace with hash 992145926, now seen corresponding path program 4 times [2021-05-02 23:31:01,940 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:01,940 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [378484588] [2021-05-02 23:31:01,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:01,944 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_28 v_main_~n~0_11) InVars {main_~i~0=v_main_~i~0_28, main_~n~0=v_main_~n~0_11} OutVars{main_~i~0=v_main_~i~0_28, main_~n~0=v_main_~n~0_11} AuxVars[] AssignedVars[] [2021-05-02 23:31:01,947 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:01,958 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:01,963 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:01,973 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:01,987 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:01,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:02,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:02,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:02,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:02,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:02,080 INFO 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 23:31:02,210 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:02,210 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [378484588] [2021-05-02 23:31:02,210 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [378484588] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:02,210 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:02,210 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-02 23:31:02,210 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298305784] [2021-05-02 23:31:02,211 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 23:31:02,211 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:02,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 23:31:02,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=232, Unknown=0, NotChecked=0, Total=272 [2021-05-02 23:31:02,212 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 23:31:02,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:02,692 INFO L93 Difference]: Finished difference Result 44 states and 47 transitions. [2021-05-02 23:31:02,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 23:31:02,693 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 23:31:02,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:02,693 INFO L225 Difference]: With dead ends: 44 [2021-05-02 23:31:02,694 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 23:31:02,694 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 499.8ms TimeCoverageRelationStatistics Valid=134, Invalid=796, Unknown=0, NotChecked=0, Total=930 [2021-05-02 23:31:02,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 23:31:02,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2021-05-02 23:31:02,698 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 23:31:02,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2021-05-02 23:31:02,698 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 25 [2021-05-02 23:31:02,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:02,698 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2021-05-02 23:31:02,698 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 23:31:02,698 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2021-05-02 23:31:02,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 23:31:02,699 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:02,699 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 23:31:02,699 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-02 23:31:02,699 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:02,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:02,700 INFO L82 PathProgramCache]: Analyzing trace with hash 75849836, now seen corresponding path program 5 times [2021-05-02 23:31:02,700 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:02,700 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [495464009] [2021-05-02 23:31:02,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:02,704 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_36 v_main_~n~0_12) InVars {main_~i~0=v_main_~i~0_36, main_~n~0=v_main_~n~0_12} OutVars{main_~i~0=v_main_~i~0_36, main_~n~0=v_main_~n~0_12} AuxVars[] AssignedVars[] [2021-05-02 23:31:02,706 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:02,707 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:02,712 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:02,732 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:02,746 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:02,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:02,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:02,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:02,829 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:02,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:02,832 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:31:02,988 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:02,988 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [495464009] [2021-05-02 23:31:02,988 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [495464009] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:02,989 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:02,989 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-02 23:31:02,989 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112551596] [2021-05-02 23:31:02,989 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 23:31:02,989 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:02,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 23:31:02,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-05-02 23:31:02,990 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 23:31:03,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:03,554 INFO L93 Difference]: Finished difference Result 45 states and 48 transitions. [2021-05-02 23:31:03,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 23:31:03,555 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 23:31:03,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:03,556 INFO L225 Difference]: With dead ends: 45 [2021-05-02 23:31:03,556 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 23:31:03,557 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 589.3ms TimeCoverageRelationStatistics Valid=155, Invalid=901, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 23:31:03,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 23:31:03,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2021-05-02 23:31:03,561 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 23:31:03,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2021-05-02 23:31:03,562 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 26 [2021-05-02 23:31:03,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:03,562 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2021-05-02 23:31:03,562 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 23:31:03,563 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2021-05-02 23:31:03,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 23:31:03,563 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:03,563 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 23:31:03,563 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-02 23:31:03,564 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:03,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:03,564 INFO L82 PathProgramCache]: Analyzing trace with hash 1735442118, now seen corresponding path program 6 times [2021-05-02 23:31:03,564 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:03,564 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [929980628] [2021-05-02 23:31:03,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:03,570 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_45 v_main_~n~0_13) InVars {main_~i~0=v_main_~i~0_45, main_~n~0=v_main_~n~0_13} OutVars{main_~i~0=v_main_~i~0_45, main_~n~0=v_main_~n~0_13} AuxVars[] AssignedVars[] [2021-05-02 23:31:03,573 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:03,575 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:03,582 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:03,608 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:03,625 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:03,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:03,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:03,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:03,739 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:03,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:03,741 INFO 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 23:31:03,902 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:03,903 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [929980628] [2021-05-02 23:31:03,903 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [929980628] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:03,903 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:03,903 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-02 23:31:03,903 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543009922] [2021-05-02 23:31:03,903 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 23:31:03,903 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:03,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 23:31:03,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=289, Unknown=0, NotChecked=0, Total=342 [2021-05-02 23:31:03,904 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 23:31:04,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:04,523 INFO L93 Difference]: Finished difference Result 46 states and 49 transitions. [2021-05-02 23:31:04,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 23:31:04,524 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 23:31:04,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:04,524 INFO L225 Difference]: With dead ends: 46 [2021-05-02 23:31:04,524 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 23:31:04,525 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 634.1ms TimeCoverageRelationStatistics Valid=166, Invalid=1024, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 23:31:04,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 23:31:04,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2021-05-02 23:31:04,529 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 23:31:04,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2021-05-02 23:31:04,529 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 27 [2021-05-02 23:31:04,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:04,529 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2021-05-02 23:31:04,529 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 23:31:04,529 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2021-05-02 23:31:04,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 23:31:04,530 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:04,530 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 23:31:04,530 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-02 23:31:04,530 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:04,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:04,531 INFO L82 PathProgramCache]: Analyzing trace with hash 1643195308, now seen corresponding path program 7 times [2021-05-02 23:31:04,531 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:04,531 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [210538400] [2021-05-02 23:31:04,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:04,535 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_55 v_main_~n~0_14) InVars {main_~i~0=v_main_~i~0_55, main_~n~0=v_main_~n~0_14} OutVars{main_~i~0=v_main_~i~0_55, main_~n~0=v_main_~n~0_14} AuxVars[] AssignedVars[] [2021-05-02 23:31:04,537 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:04,538 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:04,545 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:04,568 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:04,582 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:04,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:04,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:04,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:04,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:04,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:04,665 INFO 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 23:31:04,881 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:04,882 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [210538400] [2021-05-02 23:31:04,882 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [210538400] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:04,882 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:04,882 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-02 23:31:04,882 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1453919291] [2021-05-02 23:31:04,882 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 23:31:04,882 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:04,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 23:31:04,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=331, Unknown=0, NotChecked=0, Total=380 [2021-05-02 23:31:04,883 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 23:31:05,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:05,542 INFO L93 Difference]: Finished difference Result 47 states and 50 transitions. [2021-05-02 23:31:05,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 23:31:05,542 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 23:31:05,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:05,543 INFO L225 Difference]: With dead ends: 47 [2021-05-02 23:31:05,543 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 23:31:05,544 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 708.8ms TimeCoverageRelationStatistics Valid=161, Invalid=1171, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 23:31:05,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 23:31:05,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2021-05-02 23:31:05,548 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 23:31:05,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2021-05-02 23:31:05,549 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 28 [2021-05-02 23:31:05,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:05,549 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2021-05-02 23:31:05,549 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 23:31:05,549 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2021-05-02 23:31:05,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 23:31:05,550 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:05,550 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 23:31:05,550 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-02 23:31:05,550 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:05,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:05,550 INFO L82 PathProgramCache]: Analyzing trace with hash -1216455802, now seen corresponding path program 8 times [2021-05-02 23:31:05,551 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:05,551 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1474017394] [2021-05-02 23:31:05,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:05,555 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_66 v_main_~n~0_15) InVars {main_~i~0=v_main_~i~0_66, main_~n~0=v_main_~n~0_15} OutVars{main_~i~0=v_main_~i~0_66, main_~n~0=v_main_~n~0_15} AuxVars[] AssignedVars[] [2021-05-02 23:31:05,557 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:05,570 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:05,575 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:05,585 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:05,599 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:05,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:05,681 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:05,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:05,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:05,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:05,688 INFO 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 23:31:05,932 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:05,932 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1474017394] [2021-05-02 23:31:05,932 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1474017394] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:05,932 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:05,932 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-02 23:31:05,932 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390746605] [2021-05-02 23:31:05,933 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 23:31:05,933 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:05,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 23:31:05,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2021-05-02 23:31:05,934 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 23:31:06,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:06,644 INFO L93 Difference]: Finished difference Result 48 states and 51 transitions. [2021-05-02 23:31:06,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 23:31:06,644 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 23:31:06,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:06,645 INFO L225 Difference]: With dead ends: 48 [2021-05-02 23:31:06,645 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 23:31:06,646 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 270 ImplicationChecksByTransitivity, 772.1ms TimeCoverageRelationStatistics Valid=188, Invalid=1294, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 23:31:06,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 23:31:06,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2021-05-02 23:31:06,649 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 23:31:06,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2021-05-02 23:31:06,650 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 29 [2021-05-02 23:31:06,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:06,650 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2021-05-02 23:31:06,650 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 23:31:06,650 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2021-05-02 23:31:06,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 23:31:06,651 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:06,651 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 23:31:06,651 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-02 23:31:06,651 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:06,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:06,651 INFO L82 PathProgramCache]: Analyzing trace with hash 328673004, now seen corresponding path program 9 times [2021-05-02 23:31:06,652 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:06,652 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [44176654] [2021-05-02 23:31:06,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:06,655 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_78 v_main_~n~0_16) InVars {main_~i~0=v_main_~i~0_78, main_~n~0=v_main_~n~0_16} OutVars{main_~i~0=v_main_~i~0_78, main_~n~0=v_main_~n~0_16} AuxVars[] AssignedVars[] [2021-05-02 23:31:06,657 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:06,658 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:06,663 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:06,682 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:06,701 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:06,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:06,815 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:06,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:06,819 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:06,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:06,821 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:31:07,068 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:07,068 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [44176654] [2021-05-02 23:31:07,069 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [44176654] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:07,069 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:07,069 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-02 23:31:07,069 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [943437345] [2021-05-02 23:31:07,070 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 23:31:07,070 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:07,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 23:31:07,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=406, Unknown=0, NotChecked=0, Total=462 [2021-05-02 23:31:07,071 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 23:31:07,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:07,920 INFO L93 Difference]: Finished difference Result 49 states and 52 transitions. [2021-05-02 23:31:07,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 23:31:07,920 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 23:31:07,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:07,921 INFO L225 Difference]: With dead ends: 49 [2021-05-02 23:31:07,921 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 23:31:07,922 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 331 ImplicationChecksByTransitivity, 909.5ms TimeCoverageRelationStatistics Valid=180, Invalid=1460, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 23:31:07,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 23:31:07,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2021-05-02 23:31:07,925 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 23:31:07,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2021-05-02 23:31:07,926 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 30 [2021-05-02 23:31:07,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:07,926 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2021-05-02 23:31:07,926 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 23:31:07,926 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2021-05-02 23:31:07,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 23:31:07,926 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:07,926 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 23:31:07,927 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-05-02 23:31:07,927 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:07,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:07,927 INFO L82 PathProgramCache]: Analyzing trace with hash 983025734, now seen corresponding path program 10 times [2021-05-02 23:31:07,927 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:07,927 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1275341791] [2021-05-02 23:31:07,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:07,930 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_91 v_main_~n~0_17) InVars {main_~i~0=v_main_~i~0_91, main_~n~0=v_main_~n~0_17} OutVars{main_~i~0=v_main_~i~0_91, main_~n~0=v_main_~n~0_17} AuxVars[] AssignedVars[] [2021-05-02 23:31:07,932 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:07,933 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:07,938 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:07,959 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:07,973 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:07,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:08,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:08,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:08,051 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:08,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:08,053 INFO 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 23:31:08,322 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:08,323 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1275341791] [2021-05-02 23:31:08,323 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1275341791] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:08,323 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:08,323 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-02 23:31:08,323 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891339915] [2021-05-02 23:31:08,323 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 23:31:08,323 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:08,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 23:31:08,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2021-05-02 23:31:08,324 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 23:31:09,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:09,123 INFO L93 Difference]: Finished difference Result 50 states and 53 transitions. [2021-05-02 23:31:09,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 23:31:09,124 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 23:31:09,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:09,124 INFO L225 Difference]: With dead ends: 50 [2021-05-02 23:31:09,125 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 23:31:09,125 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 329 ImplicationChecksByTransitivity, 874.4ms TimeCoverageRelationStatistics Valid=210, Invalid=1596, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 23:31:09,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 23:31:09,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2021-05-02 23:31:09,129 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 23:31:09,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2021-05-02 23:31:09,131 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 31 [2021-05-02 23:31:09,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:09,131 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2021-05-02 23:31:09,132 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 23:31:09,132 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2021-05-02 23:31:09,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 23:31:09,132 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:09,132 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 23:31:09,133 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-02 23:31:09,133 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:09,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:09,133 INFO L82 PathProgramCache]: Analyzing trace with hash -206876116, now seen corresponding path program 11 times [2021-05-02 23:31:09,133 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:09,133 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2031300136] [2021-05-02 23:31:09,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:09,138 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_105 v_main_~n~0_18) InVars {main_~i~0=v_main_~i~0_105, main_~n~0=v_main_~n~0_18} OutVars{main_~i~0=v_main_~i~0_105, main_~n~0=v_main_~n~0_18} AuxVars[] AssignedVars[] [2021-05-02 23:31:09,140 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:09,152 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:09,157 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:09,167 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:09,183 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:09,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:09,256 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:09,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:09,260 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:09,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:09,264 INFO 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 23:31:09,556 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:09,556 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2031300136] [2021-05-02 23:31:09,556 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2031300136] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:09,556 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:09,556 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-02 23:31:09,557 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1587844901] [2021-05-02 23:31:09,557 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 23:31:09,557 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:09,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 23:31:09,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=490, Unknown=0, NotChecked=0, Total=552 [2021-05-02 23:31:09,558 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 23:31:10,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:10,475 INFO L93 Difference]: Finished difference Result 51 states and 54 transitions. [2021-05-02 23:31:10,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 23:31:10,476 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 23:31:10,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:10,477 INFO L225 Difference]: With dead ends: 51 [2021-05-02 23:31:10,477 INFO L226 Difference]: Without dead ends: 37 [2021-05-02 23:31:10,477 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 396 ImplicationChecksByTransitivity, 955.9ms TimeCoverageRelationStatistics Valid=198, Invalid=1782, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 23:31:10,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-02 23:31:10,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2021-05-02 23:31:10,483 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 23:31:10,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2021-05-02 23:31:10,483 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 32 [2021-05-02 23:31:10,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:10,484 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2021-05-02 23:31:10,484 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 23:31:10,484 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2021-05-02 23:31:10,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 23:31:10,484 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:10,484 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 23:31:10,484 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-05-02 23:31:10,484 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:10,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:10,485 INFO L82 PathProgramCache]: Analyzing trace with hash 1560872198, now seen corresponding path program 12 times [2021-05-02 23:31:10,485 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:10,485 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [204479404] [2021-05-02 23:31:10,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:10,499 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_120 v_main_~n~0_19) InVars {main_~i~0=v_main_~i~0_120, main_~n~0=v_main_~n~0_19} OutVars{main_~i~0=v_main_~i~0_120, main_~n~0=v_main_~n~0_19} AuxVars[] AssignedVars[] [2021-05-02 23:31:10,500 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:10,501 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:10,506 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:10,529 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:10,546 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:10,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:10,618 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:10,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:10,622 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:10,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:10,624 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 23:31:10,969 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:10,969 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [204479404] [2021-05-02 23:31:10,969 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [204479404] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:10,969 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:10,969 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-02 23:31:10,969 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092552123] [2021-05-02 23:31:10,969 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 23:31:10,970 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:10,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 23:31:10,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2021-05-02 23:31:10,970 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 23:31:11,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:11,880 INFO L93 Difference]: Finished difference Result 52 states and 55 transitions. [2021-05-02 23:31:11,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 23:31:11,881 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 23:31:11,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:11,881 INFO L225 Difference]: With dead ends: 52 [2021-05-02 23:31:11,881 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 23:31:11,882 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 392 ImplicationChecksByTransitivity, 1002.8ms TimeCoverageRelationStatistics Valid=232, Invalid=1930, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 23:31:11,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 23:31:11,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2021-05-02 23:31:11,886 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 23:31:11,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2021-05-02 23:31:11,886 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 33 [2021-05-02 23:31:11,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:11,886 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2021-05-02 23:31:11,886 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 23:31:11,886 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2021-05-02 23:31:11,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 23:31:11,887 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:11,887 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 23:31:11,887 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-02 23:31:11,887 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:11,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:11,887 INFO L82 PathProgramCache]: Analyzing trace with hash 526495084, now seen corresponding path program 13 times [2021-05-02 23:31:11,887 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:11,887 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [369031170] [2021-05-02 23:31:11,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:11,892 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_136 v_main_~n~0_20) InVars {main_~i~0=v_main_~i~0_136, main_~n~0=v_main_~n~0_20} OutVars{main_~i~0=v_main_~i~0_136, main_~n~0=v_main_~n~0_20} AuxVars[] AssignedVars[] [2021-05-02 23:31:11,893 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:11,904 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:11,908 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:11,917 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:11,930 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:11,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:12,009 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:12,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:12,014 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:12,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:12,020 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:31:12,375 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:12,375 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [369031170] [2021-05-02 23:31:12,375 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [369031170] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:12,375 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:12,375 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-02 23:31:12,375 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666130882] [2021-05-02 23:31:12,376 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 23:31:12,376 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:12,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 23:31:12,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=569, Unknown=0, NotChecked=0, Total=650 [2021-05-02 23:31:12,376 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 23:31:13,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:13,358 INFO L93 Difference]: Finished difference Result 53 states and 56 transitions. [2021-05-02 23:31:13,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 23:31:13,359 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 23:31:13,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:13,360 INFO L225 Difference]: With dead ends: 53 [2021-05-02 23:31:13,360 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 23:31:13,361 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 425 ImplicationChecksByTransitivity, 1064.8ms TimeCoverageRelationStatistics Valid=243, Invalid=2109, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 23:31:13,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 23:31:13,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2021-05-02 23:31:13,365 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 23:31:13,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2021-05-02 23:31:13,365 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 34 [2021-05-02 23:31:13,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:13,365 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2021-05-02 23:31:13,365 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 23:31:13,365 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2021-05-02 23:31:13,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 23:31:13,366 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:13,366 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 23:31:13,366 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-02 23:31:13,366 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:13,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:13,366 INFO L82 PathProgramCache]: Analyzing trace with hash -1474424378, now seen corresponding path program 14 times [2021-05-02 23:31:13,366 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:13,366 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [806893660] [2021-05-02 23:31:13,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:13,370 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_153 v_main_~n~0_21) InVars {main_~i~0=v_main_~i~0_153, main_~n~0=v_main_~n~0_21} OutVars{main_~i~0=v_main_~i~0_153, main_~n~0=v_main_~n~0_21} AuxVars[] AssignedVars[] [2021-05-02 23:31:13,371 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:13,372 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:13,378 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:13,399 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:13,413 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:13,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:13,490 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:13,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:13,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:13,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:13,495 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:31:13,884 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:13,884 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [806893660] [2021-05-02 23:31:13,884 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [806893660] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:13,884 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:13,884 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-02 23:31:13,884 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [68408892] [2021-05-02 23:31:13,884 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 23:31:13,885 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:13,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 23:31:13,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=617, Unknown=0, NotChecked=0, Total=702 [2021-05-02 23:31:13,885 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 23:31:14,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:14,956 INFO L93 Difference]: Finished difference Result 54 states and 57 transitions. [2021-05-02 23:31:14,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 23:31:14,957 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 23:31:14,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:14,957 INFO L225 Difference]: With dead ends: 54 [2021-05-02 23:31:14,957 INFO L226 Difference]: Without dead ends: 40 [2021-05-02 23:31:14,958 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 459 ImplicationChecksByTransitivity, 1117.2ms TimeCoverageRelationStatistics Valid=254, Invalid=2296, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 23:31:14,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-02 23:31:14,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2021-05-02 23:31:14,964 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 23:31:14,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2021-05-02 23:31:14,965 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 35 [2021-05-02 23:31:14,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:14,965 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2021-05-02 23:31:14,965 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 23:31:14,965 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2021-05-02 23:31:14,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 23:31:14,965 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:14,965 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 23:31:14,966 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-05-02 23:31:14,966 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:14,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:14,966 INFO L82 PathProgramCache]: Analyzing trace with hash 921581740, now seen corresponding path program 15 times [2021-05-02 23:31:14,966 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:14,966 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1391864479] [2021-05-02 23:31:14,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:14,972 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_171 v_main_~n~0_22) InVars {main_~i~0=v_main_~i~0_171, main_~n~0=v_main_~n~0_22} OutVars{main_~i~0=v_main_~i~0_171, main_~n~0=v_main_~n~0_22} AuxVars[] AssignedVars[] [2021-05-02 23:31:14,974 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:14,985 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:14,991 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:15,002 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:15,016 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:15,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:15,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:15,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:15,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:15,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:15,104 INFO 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 23:31:15,543 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:15,543 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1391864479] [2021-05-02 23:31:15,543 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1391864479] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:15,543 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:15,543 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-02 23:31:15,543 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603787080] [2021-05-02 23:31:15,543 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 23:31:15,543 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:15,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 23:31:15,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=667, Unknown=0, NotChecked=0, Total=756 [2021-05-02 23:31:15,544 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 23:31:16,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:16,711 INFO L93 Difference]: Finished difference Result 55 states and 58 transitions. [2021-05-02 23:31:16,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 23:31:16,712 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 23:31:16,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:16,712 INFO L225 Difference]: With dead ends: 55 [2021-05-02 23:31:16,713 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 23:31:16,713 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 1283.9ms TimeCoverageRelationStatistics Valid=265, Invalid=2491, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 23:31:16,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 23:31:16,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2021-05-02 23:31:16,717 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 23:31:16,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2021-05-02 23:31:16,717 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 36 [2021-05-02 23:31:16,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:16,718 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2021-05-02 23:31:16,718 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 23:31:16,718 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2021-05-02 23:31:16,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 23:31:16,718 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:16,718 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 23:31:16,718 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-05-02 23:31:16,718 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:16,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:16,718 INFO L82 PathProgramCache]: Analyzing trace with hash -2111639930, now seen corresponding path program 16 times [2021-05-02 23:31:16,719 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:16,719 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1991332871] [2021-05-02 23:31:16,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:16,723 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_190 v_main_~n~0_23) InVars {main_~i~0=v_main_~i~0_190, main_~n~0=v_main_~n~0_23} OutVars{main_~i~0=v_main_~i~0_190, main_~n~0=v_main_~n~0_23} AuxVars[] AssignedVars[] [2021-05-02 23:31:16,725 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:16,726 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:16,733 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:16,758 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:16,775 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:16,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:16,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:16,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:16,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:16,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:16,879 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 23:31:17,261 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:17,262 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1991332871] [2021-05-02 23:31:17,262 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1991332871] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:17,262 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:17,262 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-02 23:31:17,262 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738482609] [2021-05-02 23:31:17,263 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 23:31:17,263 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:17,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 23:31:17,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=719, Unknown=0, NotChecked=0, Total=812 [2021-05-02 23:31:17,263 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 23:31:18,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:18,289 INFO L93 Difference]: Finished difference Result 56 states and 59 transitions. [2021-05-02 23:31:18,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 23:31:18,290 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 23:31:18,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:18,290 INFO L225 Difference]: With dead ends: 56 [2021-05-02 23:31:18,290 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 23:31:18,291 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 530 ImplicationChecksByTransitivity, 1117.0ms TimeCoverageRelationStatistics Valid=276, Invalid=2694, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 23:31:18,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 23:31:18,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2021-05-02 23:31:18,297 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 23:31:18,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2021-05-02 23:31:18,298 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 37 [2021-05-02 23:31:18,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:18,298 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2021-05-02 23:31:18,298 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 23:31:18,298 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2021-05-02 23:31:18,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 23:31:18,299 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:18,299 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 23:31:18,299 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-02 23:31:18,299 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:18,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:18,300 INFO L82 PathProgramCache]: Analyzing trace with hash -1652231188, now seen corresponding path program 17 times [2021-05-02 23:31:18,300 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:18,300 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2086254765] [2021-05-02 23:31:18,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:18,311 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_210 v_main_~n~0_24) InVars {main_~i~0=v_main_~i~0_210, main_~n~0=v_main_~n~0_24} OutVars{main_~i~0=v_main_~i~0_210, main_~n~0=v_main_~n~0_24} AuxVars[] AssignedVars[] [2021-05-02 23:31:18,314 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:18,328 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:18,335 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:18,348 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:18,364 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:18,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:18,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:18,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:18,452 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:18,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:18,456 INFO 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 23:31:18,968 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:18,968 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2086254765] [2021-05-02 23:31:18,968 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2086254765] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:18,968 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:18,968 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-02 23:31:18,969 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1212368435] [2021-05-02 23:31:18,969 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 23:31:18,969 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:18,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 23:31:18,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=790, Unknown=0, NotChecked=0, Total=870 [2021-05-02 23:31:18,970 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 23:31:20,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:20,267 INFO L93 Difference]: Finished difference Result 57 states and 60 transitions. [2021-05-02 23:31:20,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 23:31:20,268 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 23:31:20,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:20,269 INFO L225 Difference]: With dead ends: 57 [2021-05-02 23:31:20,269 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 23:31:20,270 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 615 ImplicationChecksByTransitivity, 1383.2ms TimeCoverageRelationStatistics Valid=252, Invalid=2940, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 23:31:20,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 23:31:20,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2021-05-02 23:31:20,274 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 23:31:20,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2021-05-02 23:31:20,274 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 38 [2021-05-02 23:31:20,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:20,274 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2021-05-02 23:31:20,274 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 23:31:20,275 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2021-05-02 23:31:20,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 23:31:20,275 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:20,275 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 23:31:20,275 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-05-02 23:31:20,275 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:20,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:20,275 INFO L82 PathProgramCache]: Analyzing trace with hash -295462074, now seen corresponding path program 18 times [2021-05-02 23:31:20,276 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:20,276 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [606861263] [2021-05-02 23:31:20,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:20,291 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_231 v_main_~n~0_25) InVars {main_~i~0=v_main_~i~0_231, main_~n~0=v_main_~n~0_25} OutVars{main_~i~0=v_main_~i~0_231, main_~n~0=v_main_~n~0_25} AuxVars[] AssignedVars[] [2021-05-02 23:31:20,294 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:20,307 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:20,314 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:20,326 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:20,343 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:20,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:20,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:20,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:20,431 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:20,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:20,435 INFO 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 23:31:20,964 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:20,964 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [606861263] [2021-05-02 23:31:20,965 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [606861263] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:20,965 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:20,965 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-02 23:31:20,965 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597462707] [2021-05-02 23:31:20,965 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 23:31:20,965 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:20,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 23:31:20,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=829, Unknown=0, NotChecked=0, Total=930 [2021-05-02 23:31:20,966 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 23:31:22,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:22,320 INFO L93 Difference]: Finished difference Result 58 states and 61 transitions. [2021-05-02 23:31:22,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 23:31:22,321 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 23:31:22,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:22,321 INFO L225 Difference]: With dead ends: 58 [2021-05-02 23:31:22,322 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 23:31:22,322 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 605 ImplicationChecksByTransitivity, 1494.5ms TimeCoverageRelationStatistics Valid=298, Invalid=3124, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 23:31:22,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 23:31:22,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2021-05-02 23:31:22,327 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 23:31:22,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2021-05-02 23:31:22,327 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 39 [2021-05-02 23:31:22,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:22,327 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2021-05-02 23:31:22,327 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 23:31:22,327 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2021-05-02 23:31:22,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 23:31:22,328 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:22,328 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 23:31:22,328 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-05-02 23:31:22,328 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:22,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:22,328 INFO L82 PathProgramCache]: Analyzing trace with hash -1185292500, now seen corresponding path program 19 times [2021-05-02 23:31:22,328 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:22,328 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [315706915] [2021-05-02 23:31:22,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:22,332 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_253 v_main_~n~0_26) InVars {main_~i~0=v_main_~i~0_253, main_~n~0=v_main_~n~0_26} OutVars{main_~i~0=v_main_~i~0_253, main_~n~0=v_main_~n~0_26} AuxVars[] AssignedVars[] [2021-05-02 23:31:22,333 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:22,345 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:22,351 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:22,360 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:22,374 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:22,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:22,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:22,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:22,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:22,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:22,455 INFO 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 23:31:23,029 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:23,030 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [315706915] [2021-05-02 23:31:23,030 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [315706915] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:23,030 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:23,030 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-02 23:31:23,030 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985719844] [2021-05-02 23:31:23,030 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 23:31:23,030 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:23,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 23:31:23,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=906, Unknown=0, NotChecked=0, Total=992 [2021-05-02 23:31:23,031 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 23:31:24,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:24,402 INFO L93 Difference]: Finished difference Result 59 states and 62 transitions. [2021-05-02 23:31:24,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 23:31:24,403 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 23:31:24,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:24,403 INFO L225 Difference]: With dead ends: 59 [2021-05-02 23:31:24,403 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 23:31:24,404 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 696 ImplicationChecksByTransitivity, 1523.9ms TimeCoverageRelationStatistics Valid=270, Invalid=3390, Unknown=0, NotChecked=0, Total=3660 [2021-05-02 23:31:24,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 23:31:24,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2021-05-02 23:31:24,407 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 23:31:24,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions. [2021-05-02 23:31:24,408 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 40 [2021-05-02 23:31:24,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:24,408 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 45 transitions. [2021-05-02 23:31:24,408 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 23:31:24,408 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions. [2021-05-02 23:31:24,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 23:31:24,408 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:24,408 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 23:31:24,408 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-05-02 23:31:24,408 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:24,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:24,409 INFO L82 PathProgramCache]: Analyzing trace with hash 1294735366, now seen corresponding path program 20 times [2021-05-02 23:31:24,409 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:24,409 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [654397433] [2021-05-02 23:31:24,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:24,413 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_276 v_main_~n~0_27) InVars {main_~i~0=v_main_~i~0_276, main_~n~0=v_main_~n~0_27} OutVars{main_~i~0=v_main_~i~0_276, main_~n~0=v_main_~n~0_27} AuxVars[] AssignedVars[] [2021-05-02 23:31:24,414 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:24,415 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:24,420 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:24,440 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:24,454 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:24,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:24,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:24,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:24,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:24,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:24,544 INFO 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 23:31:25,192 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:25,192 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [654397433] [2021-05-02 23:31:25,193 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [654397433] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:25,193 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:25,193 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-02 23:31:25,193 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490468476] [2021-05-02 23:31:25,193 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 23:31:25,193 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:25,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 23:31:25,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=947, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 23:31:25,194 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 23:31:26,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:26,567 INFO L93 Difference]: Finished difference Result 60 states and 63 transitions. [2021-05-02 23:31:26,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 23:31:26,568 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 23:31:26,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:26,571 INFO L225 Difference]: With dead ends: 60 [2021-05-02 23:31:26,571 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 23:31:26,573 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 684 ImplicationChecksByTransitivity, 1559.3ms TimeCoverageRelationStatistics Valid=320, Invalid=3586, Unknown=0, NotChecked=0, Total=3906 [2021-05-02 23:31:26,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 23:31:26,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2021-05-02 23:31:26,584 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 23:31:26,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2021-05-02 23:31:26,585 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 41 [2021-05-02 23:31:26,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:26,585 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2021-05-02 23:31:26,585 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 23:31:26,585 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2021-05-02 23:31:26,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 23:31:26,585 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:26,586 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 23:31:26,586 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-05-02 23:31:26,586 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:26,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:26,586 INFO L82 PathProgramCache]: Analyzing trace with hash 866187884, now seen corresponding path program 21 times [2021-05-02 23:31:26,586 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:26,586 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [18286385] [2021-05-02 23:31:26,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:26,591 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_300 v_main_~n~0_28) InVars {main_~i~0=v_main_~i~0_300, main_~n~0=v_main_~n~0_28} OutVars{main_~i~0=v_main_~i~0_300, main_~n~0=v_main_~n~0_28} AuxVars[] AssignedVars[] [2021-05-02 23:31:26,592 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:26,613 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:26,619 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:26,628 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:26,645 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:26,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:26,768 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:26,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:26,772 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:26,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:26,774 INFO 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 23:31:27,475 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:27,475 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [18286385] [2021-05-02 23:31:27,475 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [18286385] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:27,475 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:27,475 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-02 23:31:27,475 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722044602] [2021-05-02 23:31:27,476 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 23:31:27,476 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:27,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 23:31:27,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1009, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 23:31:27,476 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 23:31:29,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:29,069 INFO L93 Difference]: Finished difference Result 61 states and 64 transitions. [2021-05-02 23:31:29,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 23:31:29,069 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 23:31:29,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:29,070 INFO L225 Difference]: With dead ends: 61 [2021-05-02 23:31:29,070 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 23:31:29,071 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 725 ImplicationChecksByTransitivity, 1799.2ms TimeCoverageRelationStatistics Valid=331, Invalid=3829, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 23:31:29,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 23:31:29,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2021-05-02 23:31:29,074 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 23:31:29,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2021-05-02 23:31:29,075 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 42 [2021-05-02 23:31:29,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:29,075 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2021-05-02 23:31:29,075 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 23:31:29,075 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2021-05-02 23:31:29,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 23:31:29,075 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:29,075 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 23:31:29,076 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-05-02 23:31:29,076 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:29,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:29,076 INFO L82 PathProgramCache]: Analyzing trace with hash 466117830, now seen corresponding path program 22 times [2021-05-02 23:31:29,076 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:29,076 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [526510650] [2021-05-02 23:31:29,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:29,104 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_325 v_main_~n~0_29) InVars {main_~i~0=v_main_~i~0_325, main_~n~0=v_main_~n~0_29} OutVars{main_~i~0=v_main_~i~0_325, main_~n~0=v_main_~n~0_29} AuxVars[] AssignedVars[] [2021-05-02 23:31:29,106 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:29,117 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:29,121 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:29,131 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:29,143 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:29,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:29,230 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:29,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:29,251 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:29,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:29,254 INFO 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 23:31:29,811 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:29,811 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [526510650] [2021-05-02 23:31:29,811 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [526510650] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:29,811 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:29,811 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-02 23:31:29,811 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562057935] [2021-05-02 23:31:29,811 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 23:31:29,811 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:29,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 23:31:29,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1073, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 23:31:29,812 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 23:31:31,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:31,235 INFO L93 Difference]: Finished difference Result 62 states and 65 transitions. [2021-05-02 23:31:31,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 23:31:31,235 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 23:31:31,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:31,236 INFO L225 Difference]: With dead ends: 62 [2021-05-02 23:31:31,236 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 23:31:31,240 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 767 ImplicationChecksByTransitivity, 1504.5ms TimeCoverageRelationStatistics Valid=342, Invalid=4080, Unknown=0, NotChecked=0, Total=4422 [2021-05-02 23:31:31,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 23:31:31,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2021-05-02 23:31:31,244 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 23:31:31,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2021-05-02 23:31:31,245 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 43 [2021-05-02 23:31:31,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:31,245 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2021-05-02 23:31:31,245 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 23:31:31,245 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2021-05-02 23:31:31,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 23:31:31,245 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:31,245 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 23:31:31,245 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-05-02 23:31:31,245 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:31,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:31,246 INFO L82 PathProgramCache]: Analyzing trace with hash 948848044, now seen corresponding path program 23 times [2021-05-02 23:31:31,246 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:31,246 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1052481995] [2021-05-02 23:31:31,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:31,251 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_351 v_main_~n~0_30) InVars {main_~i~0=v_main_~i~0_351, main_~n~0=v_main_~n~0_30} OutVars{main_~i~0=v_main_~i~0_351, main_~n~0=v_main_~n~0_30} AuxVars[] AssignedVars[] [2021-05-02 23:31:31,253 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:31,264 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:31,271 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:31,281 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:31,294 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:31,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:31,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:31,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:31,371 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:31,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:31,374 INFO 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 23:31:31,940 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:31,940 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1052481995] [2021-05-02 23:31:31,940 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1052481995] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:31,940 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:31,940 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-02 23:31:31,940 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351391374] [2021-05-02 23:31:31,941 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 23:31:31,941 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:31,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 23:31:31,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=1139, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 23:31:31,941 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 23:31:33,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:33,404 INFO L93 Difference]: Finished difference Result 63 states and 66 transitions. [2021-05-02 23:31:33,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 23:31:33,405 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 23:31:33,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:33,406 INFO L225 Difference]: With dead ends: 63 [2021-05-02 23:31:33,406 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 23:31:33,407 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 810 ImplicationChecksByTransitivity, 1522.4ms TimeCoverageRelationStatistics Valid=353, Invalid=4339, Unknown=0, NotChecked=0, Total=4692 [2021-05-02 23:31:33,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 23:31:33,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2021-05-02 23:31:33,413 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 23:31:33,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2021-05-02 23:31:33,414 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 44 [2021-05-02 23:31:33,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:33,414 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2021-05-02 23:31:33,414 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 23:31:33,415 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2021-05-02 23:31:33,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 23:31:33,415 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:33,415 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 23:31:33,415 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-05-02 23:31:33,415 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:33,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:33,416 INFO L82 PathProgramCache]: Analyzing trace with hash -1266384506, now seen corresponding path program 24 times [2021-05-02 23:31:33,416 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:33,416 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1500094122] [2021-05-02 23:31:33,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:33,421 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_378 v_main_~n~0_31) InVars {main_~i~0=v_main_~i~0_378, main_~n~0=v_main_~n~0_31} OutVars{main_~i~0=v_main_~i~0_378, main_~n~0=v_main_~n~0_31} AuxVars[] AssignedVars[] [2021-05-02 23:31:33,426 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:33,427 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:33,433 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:33,454 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:33,467 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:33,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:33,568 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:33,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:33,591 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:33,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:33,595 INFO 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 23:31:34,389 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:34,389 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1500094122] [2021-05-02 23:31:34,389 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1500094122] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:34,389 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:34,389 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-02 23:31:34,389 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472167762] [2021-05-02 23:31:34,389 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 23:31:34,389 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:34,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 23:31:34,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1207, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 23:31:34,390 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 23:31:36,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:36,199 INFO L93 Difference]: Finished difference Result 64 states and 67 transitions. [2021-05-02 23:31:36,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-02 23:31:36,200 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 23:31:36,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:36,200 INFO L225 Difference]: With dead ends: 64 [2021-05-02 23:31:36,200 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 23:31:36,201 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 854 ImplicationChecksByTransitivity, 1927.7ms TimeCoverageRelationStatistics Valid=364, Invalid=4606, Unknown=0, NotChecked=0, Total=4970 [2021-05-02 23:31:36,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 23:31:36,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2021-05-02 23:31:36,204 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 23:31:36,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2021-05-02 23:31:36,205 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 45 [2021-05-02 23:31:36,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:36,205 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2021-05-02 23:31:36,205 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 23:31:36,205 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2021-05-02 23:31:36,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 23:31:36,205 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:36,205 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 23:31:36,205 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-05-02 23:31:36,206 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:36,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:36,206 INFO L82 PathProgramCache]: Analyzing trace with hash -1219116820, now seen corresponding path program 25 times [2021-05-02 23:31:36,206 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:36,206 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1670151557] [2021-05-02 23:31:36,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:36,210 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_406 v_main_~n~0_32) InVars {main_~i~0=v_main_~i~0_406, main_~n~0=v_main_~n~0_32} OutVars{main_~i~0=v_main_~i~0_406, main_~n~0=v_main_~n~0_32} AuxVars[] AssignedVars[] [2021-05-02 23:31:36,214 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:36,228 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:36,235 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:36,247 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:36,263 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:36,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:36,356 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:36,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:36,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:36,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:36,364 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:31:37,150 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:37,150 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1670151557] [2021-05-02 23:31:37,151 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1670151557] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:37,151 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:37,151 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-02 23:31:37,151 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684869806] [2021-05-02 23:31:37,151 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 23:31:37,151 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:37,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 23:31:37,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1277, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 23:31:37,152 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 23:31:38,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:38,897 INFO L93 Difference]: Finished difference Result 65 states and 68 transitions. [2021-05-02 23:31:38,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 23:31:38,897 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 23:31:38,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:38,898 INFO L225 Difference]: With dead ends: 65 [2021-05-02 23:31:38,898 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 23:31:38,899 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 899 ImplicationChecksByTransitivity, 1974.9ms TimeCoverageRelationStatistics Valid=375, Invalid=4881, Unknown=0, NotChecked=0, Total=5256 [2021-05-02 23:31:38,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 23:31:38,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2021-05-02 23:31:38,902 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 23:31:38,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2021-05-02 23:31:38,902 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 46 [2021-05-02 23:31:38,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:38,903 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2021-05-02 23:31:38,903 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 23:31:38,903 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2021-05-02 23:31:38,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 23:31:38,903 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:38,903 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 23:31:38,903 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-05-02 23:31:38,903 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:38,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:38,903 INFO L82 PathProgramCache]: Analyzing trace with hash 246181446, now seen corresponding path program 26 times [2021-05-02 23:31:38,903 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:38,903 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1052485361] [2021-05-02 23:31:38,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:38,907 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_435 v_main_~n~0_33) InVars {main_~i~0=v_main_~i~0_435, main_~n~0=v_main_~n~0_33} OutVars{main_~i~0=v_main_~i~0_435, main_~n~0=v_main_~n~0_33} AuxVars[] AssignedVars[] [2021-05-02 23:31:38,909 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:38,921 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:38,926 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:38,936 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:38,952 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:38,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:39,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:39,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:39,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:39,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:39,030 INFO 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 23:31:39,782 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:39,783 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1052485361] [2021-05-02 23:31:39,783 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1052485361] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:39,783 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:39,783 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-02 23:31:39,783 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688834016] [2021-05-02 23:31:39,783 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 23:31:39,783 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:39,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 23:31:39,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=1349, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 23:31:39,784 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 23:31:41,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:41,576 INFO L93 Difference]: Finished difference Result 66 states and 69 transitions. [2021-05-02 23:31:41,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 23:31:41,576 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 23:31:41,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:41,577 INFO L225 Difference]: With dead ends: 66 [2021-05-02 23:31:41,577 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 23:31:41,577 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 945 ImplicationChecksByTransitivity, 1951.5ms TimeCoverageRelationStatistics Valid=386, Invalid=5164, Unknown=0, NotChecked=0, Total=5550 [2021-05-02 23:31:41,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 23:31:41,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2021-05-02 23:31:41,581 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 23:31:41,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2021-05-02 23:31:41,581 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 47 [2021-05-02 23:31:41,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:41,581 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2021-05-02 23:31:41,581 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 23:31:41,581 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2021-05-02 23:31:41,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-02 23:31:41,582 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:41,582 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 23:31:41,582 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-05-02 23:31:41,582 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:41,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:41,582 INFO L82 PathProgramCache]: Analyzing trace with hash -1574212564, now seen corresponding path program 27 times [2021-05-02 23:31:41,582 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:41,582 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1704281577] [2021-05-02 23:31:41,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:41,586 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_465 v_main_~n~0_34) InVars {main_~i~0=v_main_~i~0_465, main_~n~0=v_main_~n~0_34} OutVars{main_~i~0=v_main_~i~0_465, main_~n~0=v_main_~n~0_34} AuxVars[] AssignedVars[] [2021-05-02 23:31:41,587 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:41,587 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:41,593 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:41,613 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:41,628 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:41,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:41,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:41,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:41,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:41,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:41,703 INFO 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 23:31:42,546 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:42,546 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1704281577] [2021-05-02 23:31:42,546 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1704281577] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:42,546 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:42,546 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-02 23:31:42,546 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [11408195] [2021-05-02 23:31:42,546 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 23:31:42,546 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:42,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 23:31:42,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=1423, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 23:31:42,547 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 23:31:44,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:44,482 INFO L93 Difference]: Finished difference Result 67 states and 70 transitions. [2021-05-02 23:31:44,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 23:31:44,483 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 23:31:44,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:44,483 INFO L225 Difference]: With dead ends: 67 [2021-05-02 23:31:44,483 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 23:31:44,484 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 992 ImplicationChecksByTransitivity, 2117.9ms TimeCoverageRelationStatistics Valid=397, Invalid=5455, Unknown=0, NotChecked=0, Total=5852 [2021-05-02 23:31:44,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 23:31:44,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2021-05-02 23:31:44,487 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 23:31:44,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2021-05-02 23:31:44,487 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 48 [2021-05-02 23:31:44,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:44,488 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2021-05-02 23:31:44,488 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 23:31:44,488 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2021-05-02 23:31:44,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 23:31:44,488 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:44,488 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 23:31:44,488 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-05-02 23:31:44,488 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:44,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:44,488 INFO L82 PathProgramCache]: Analyzing trace with hash 2123115270, now seen corresponding path program 28 times [2021-05-02 23:31:44,489 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:44,489 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1358298980] [2021-05-02 23:31:44,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:44,492 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_496 v_main_~n~0_35) InVars {main_~i~0=v_main_~i~0_496, main_~n~0=v_main_~n~0_35} OutVars{main_~i~0=v_main_~i~0_496, main_~n~0=v_main_~n~0_35} AuxVars[] AssignedVars[] [2021-05-02 23:31:44,494 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:44,495 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:44,500 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:44,522 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:44,539 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:44,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:44,619 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:44,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:44,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:44,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:44,625 INFO 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 23:31:45,517 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:45,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1358298980] [2021-05-02 23:31:45,517 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1358298980] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:45,518 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:45,518 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-02 23:31:45,518 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039319398] [2021-05-02 23:31:45,518 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 23:31:45,518 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:45,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 23:31:45,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=1499, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 23:31:45,541 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 23:31:47,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:47,612 INFO L93 Difference]: Finished difference Result 68 states and 71 transitions. [2021-05-02 23:31:47,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 23:31:47,612 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 23:31:47,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:47,613 INFO L225 Difference]: With dead ends: 68 [2021-05-02 23:31:47,613 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 23:31:47,614 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1040 ImplicationChecksByTransitivity, 2231.4ms TimeCoverageRelationStatistics Valid=408, Invalid=5754, Unknown=0, NotChecked=0, Total=6162 [2021-05-02 23:31:47,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 23:31:47,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2021-05-02 23:31:47,618 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 23:31:47,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2021-05-02 23:31:47,618 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 49 [2021-05-02 23:31:47,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:47,618 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2021-05-02 23:31:47,618 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 23:31:47,618 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2021-05-02 23:31:47,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 23:31:47,619 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:47,619 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 23:31:47,619 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-05-02 23:31:47,619 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:47,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:47,619 INFO L82 PathProgramCache]: Analyzing trace with hash 776161132, now seen corresponding path program 29 times [2021-05-02 23:31:47,619 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:47,620 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1050870544] [2021-05-02 23:31:47,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:47,624 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_528 v_main_~n~0_36) InVars {main_~i~0=v_main_~i~0_528, main_~n~0=v_main_~n~0_36} OutVars{main_~i~0=v_main_~i~0_528, main_~n~0=v_main_~n~0_36} AuxVars[] AssignedVars[] [2021-05-02 23:31:47,625 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:47,639 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:47,651 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:47,662 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:47,677 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:47,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:47,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:47,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:47,779 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:47,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:47,781 INFO 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 23:31:48,620 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:48,620 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1050870544] [2021-05-02 23:31:48,620 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1050870544] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:48,620 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:48,620 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-02 23:31:48,621 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415485514] [2021-05-02 23:31:48,621 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-02 23:31:48,621 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:48,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-02 23:31:48,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1577, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 23:31:48,621 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 23:31:50,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:50,584 INFO L93 Difference]: Finished difference Result 69 states and 72 transitions. [2021-05-02 23:31:50,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-02 23:31:50,585 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 23:31:50,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:50,585 INFO L225 Difference]: With dead ends: 69 [2021-05-02 23:31:50,585 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 23:31:50,586 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1089 ImplicationChecksByTransitivity, 2154.6ms TimeCoverageRelationStatistics Valid=419, Invalid=6061, Unknown=0, NotChecked=0, Total=6480 [2021-05-02 23:31:50,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 23:31:50,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2021-05-02 23:31:50,589 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 23:31:50,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2021-05-02 23:31:50,590 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 50 [2021-05-02 23:31:50,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:50,590 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2021-05-02 23:31:50,590 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 23:31:50,590 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2021-05-02 23:31:50,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 23:31:50,590 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:50,590 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 23:31:50,590 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-05-02 23:31:50,590 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:50,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:50,591 INFO L82 PathProgramCache]: Analyzing trace with hash 1970255814, now seen corresponding path program 30 times [2021-05-02 23:31:50,591 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:50,591 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [928387147] [2021-05-02 23:31:50,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:50,594 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_561 v_main_~n~0_37) InVars {main_~i~0=v_main_~i~0_561, main_~n~0=v_main_~n~0_37} OutVars{main_~i~0=v_main_~i~0_561, main_~n~0=v_main_~n~0_37} AuxVars[] AssignedVars[] [2021-05-02 23:31:50,595 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:50,596 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:50,600 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:50,620 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:50,634 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:50,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:50,711 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:50,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:50,713 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:50,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:50,715 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 23:31:51,652 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:51,652 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [928387147] [2021-05-02 23:31:51,652 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [928387147] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:51,652 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:51,652 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-02 23:31:51,652 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610566841] [2021-05-02 23:31:51,653 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 23:31:51,653 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:51,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 23:31:51,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1657, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 23:31:51,653 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 23:31:53,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:53,861 INFO L93 Difference]: Finished difference Result 70 states and 73 transitions. [2021-05-02 23:31:53,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 23:31:53,862 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 23:31:53,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:53,862 INFO L225 Difference]: With dead ends: 70 [2021-05-02 23:31:53,862 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 23:31:53,863 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1139 ImplicationChecksByTransitivity, 2420.9ms TimeCoverageRelationStatistics Valid=430, Invalid=6376, Unknown=0, NotChecked=0, Total=6806 [2021-05-02 23:31:53,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 23:31:53,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2021-05-02 23:31:53,867 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 23:31:53,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2021-05-02 23:31:53,868 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 51 [2021-05-02 23:31:53,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:53,868 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2021-05-02 23:31:53,868 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 23:31:53,868 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2021-05-02 23:31:53,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-02 23:31:53,868 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:53,868 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 23:31:53,868 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-05-02 23:31:53,869 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:53,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:53,869 INFO L82 PathProgramCache]: Analyzing trace with hash 332485292, now seen corresponding path program 31 times [2021-05-02 23:31:53,869 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:53,869 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [33600333] [2021-05-02 23:31:53,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:53,880 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_595 v_main_~n~0_38) InVars {main_~i~0=v_main_~i~0_595, main_~n~0=v_main_~n~0_38} OutVars{main_~i~0=v_main_~i~0_595, main_~n~0=v_main_~n~0_38} AuxVars[] AssignedVars[] [2021-05-02 23:31:53,882 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:53,893 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:53,898 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:53,908 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:53,935 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:53,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:54,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:54,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:54,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:54,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:54,032 INFO 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 23:31:54,957 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:54,958 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [33600333] [2021-05-02 23:31:54,958 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [33600333] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:54,958 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:54,958 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-02 23:31:54,958 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1990695183] [2021-05-02 23:31:54,958 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 23:31:54,958 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:54,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 23:31:54,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1770, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 23:31:54,973 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 23:31:57,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:57,230 INFO L93 Difference]: Finished difference Result 71 states and 74 transitions. [2021-05-02 23:31:57,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 23:31:57,230 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 23:31:57,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:57,231 INFO L225 Difference]: With dead ends: 71 [2021-05-02 23:31:57,231 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 23:31:57,231 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1266 ImplicationChecksByTransitivity, 2415.9ms TimeCoverageRelationStatistics Valid=378, Invalid=6762, Unknown=0, NotChecked=0, Total=7140 [2021-05-02 23:31:57,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 23:31:57,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2021-05-02 23:31:57,235 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 23:31:57,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2021-05-02 23:31:57,235 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 52 [2021-05-02 23:31:57,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:57,235 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2021-05-02 23:31:57,235 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 23:31:57,235 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2021-05-02 23:31:57,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 23:31:57,236 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:57,236 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 23:31:57,236 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-05-02 23:31:57,236 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:57,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:57,236 INFO L82 PathProgramCache]: Analyzing trace with hash 1101206662, now seen corresponding path program 32 times [2021-05-02 23:31:57,236 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:57,236 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1959356613] [2021-05-02 23:31:57,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:57,239 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_630 v_main_~n~0_39) InVars {main_~i~0=v_main_~i~0_630, main_~n~0=v_main_~n~0_39} OutVars{main_~i~0=v_main_~i~0_630, main_~n~0=v_main_~n~0_39} AuxVars[] AssignedVars[] [2021-05-02 23:31:57,240 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:31:57,251 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:57,256 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:31:57,265 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:31:57,279 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:57,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:57,350 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:57,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:57,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:31:57,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:57,354 INFO 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 23:31:58,365 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:58,366 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1959356613] [2021-05-02 23:31:58,366 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1959356613] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:58,366 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:58,366 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-02 23:31:58,366 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038567706] [2021-05-02 23:31:58,366 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 23:31:58,366 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:58,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 23:31:58,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1855, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 23:31:58,367 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 23:32:00,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:00,680 INFO L93 Difference]: Finished difference Result 72 states and 75 transitions. [2021-05-02 23:32:00,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 23:32:00,680 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 23:32:00,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:00,681 INFO L225 Difference]: With dead ends: 72 [2021-05-02 23:32:00,681 INFO L226 Difference]: Without dead ends: 58 [2021-05-02 23:32:00,681 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1320 ImplicationChecksByTransitivity, 2536.7ms TimeCoverageRelationStatistics Valid=387, Invalid=7095, Unknown=0, NotChecked=0, Total=7482 [2021-05-02 23:32:00,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-02 23:32:00,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2021-05-02 23:32:00,685 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 23:32:00,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2021-05-02 23:32:00,685 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 53 [2021-05-02 23:32:00,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:00,685 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2021-05-02 23:32:00,685 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 23:32:00,685 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2021-05-02 23:32:00,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 23:32:00,685 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:00,685 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 23:32:00,686 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-05-02 23:32:00,686 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:00,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:00,686 INFO L82 PathProgramCache]: Analyzing trace with hash -838234644, now seen corresponding path program 33 times [2021-05-02 23:32:00,686 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:00,686 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1612405834] [2021-05-02 23:32:00,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:00,689 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_666 v_main_~n~0_40) InVars {main_~i~0=v_main_~i~0_666, main_~n~0=v_main_~n~0_40} OutVars{main_~i~0=v_main_~i~0_666, main_~n~0=v_main_~n~0_40} AuxVars[] AssignedVars[] [2021-05-02 23:32:00,690 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:00,690 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:00,695 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:00,722 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:00,737 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:00,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:00,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:00,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:00,829 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:00,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:00,830 INFO 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 23:32:01,887 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:01,888 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1612405834] [2021-05-02 23:32:01,888 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1612405834] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:01,888 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:01,888 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-02 23:32:01,888 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1035687698] [2021-05-02 23:32:01,888 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 23:32:01,888 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:01,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 23:32:01,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=1909, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 23:32:01,888 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 23:32:04,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:04,394 INFO L93 Difference]: Finished difference Result 73 states and 76 transitions. [2021-05-02 23:32:04,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 23:32:04,395 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 23:32:04,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:04,396 INFO L225 Difference]: With dead ends: 73 [2021-05-02 23:32:04,396 INFO L226 Difference]: Without dead ends: 59 [2021-05-02 23:32:04,396 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1295 ImplicationChecksByTransitivity, 2684.3ms TimeCoverageRelationStatistics Valid=463, Invalid=7369, Unknown=0, NotChecked=0, Total=7832 [2021-05-02 23:32:04,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-02 23:32:04,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2021-05-02 23:32:04,401 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 23:32:04,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2021-05-02 23:32:04,402 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 54 [2021-05-02 23:32:04,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:04,402 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2021-05-02 23:32:04,402 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 23:32:04,402 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2021-05-02 23:32:04,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 23:32:04,402 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:04,403 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 23:32:04,403 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-05-02 23:32:04,403 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:04,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:04,403 INFO L82 PathProgramCache]: Analyzing trace with hash -831372986, now seen corresponding path program 34 times [2021-05-02 23:32:04,403 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:04,403 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1803680987] [2021-05-02 23:32:04,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:04,407 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_703 v_main_~n~0_41) InVars {main_~i~0=v_main_~i~0_703, main_~n~0=v_main_~n~0_41} OutVars{main_~i~0=v_main_~i~0_703, main_~n~0=v_main_~n~0_41} AuxVars[] AssignedVars[] [2021-05-02 23:32:04,411 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:04,424 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:04,449 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:04,467 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:04,491 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:04,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:04,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:04,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:04,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:04,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:04,595 INFO 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 23:32:05,876 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:05,876 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1803680987] [2021-05-02 23:32:05,876 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1803680987] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:05,876 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:05,876 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2021-05-02 23:32:05,876 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489929705] [2021-05-02 23:32:05,876 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 23:32:05,876 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:05,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 23:32:05,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=1997, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 23:32:05,877 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 23:32:08,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:08,655 INFO L93 Difference]: Finished difference Result 74 states and 77 transitions. [2021-05-02 23:32:08,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 23:32:08,656 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 23:32:08,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:08,656 INFO L225 Difference]: With dead ends: 74 [2021-05-02 23:32:08,656 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 23:32:08,657 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1349 ImplicationChecksByTransitivity, 3045.5ms TimeCoverageRelationStatistics Valid=474, Invalid=7716, Unknown=0, NotChecked=0, Total=8190 [2021-05-02 23:32:08,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 23:32:08,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2021-05-02 23:32:08,660 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 23:32:08,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2021-05-02 23:32:08,660 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 55 [2021-05-02 23:32:08,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:08,660 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2021-05-02 23:32:08,661 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 23:32:08,661 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2021-05-02 23:32:08,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 23:32:08,661 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:08,661 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 23:32:08,661 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-05-02 23:32:08,661 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:08,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:08,661 INFO L82 PathProgramCache]: Analyzing trace with hash -618661588, now seen corresponding path program 35 times [2021-05-02 23:32:08,661 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:08,661 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [446356874] [2021-05-02 23:32:08,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:08,664 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_741 v_main_~n~0_42) InVars {main_~i~0=v_main_~i~0_741, main_~n~0=v_main_~n~0_42} OutVars{main_~i~0=v_main_~i~0_741, main_~n~0=v_main_~n~0_42} AuxVars[] AssignedVars[] [2021-05-02 23:32:08,665 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:08,677 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:08,682 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:08,693 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:08,708 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:08,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:08,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:08,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:08,794 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:08,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:08,795 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:09,981 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:09,981 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [446356874] [2021-05-02 23:32:09,981 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [446356874] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:09,981 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:09,981 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2021-05-02 23:32:09,981 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791688750] [2021-05-02 23:32:09,982 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 23:32:09,982 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:09,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 23:32:09,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=2087, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 23:32:09,982 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 23:32:12,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:12,424 INFO L93 Difference]: Finished difference Result 75 states and 78 transitions. [2021-05-02 23:32:12,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-02 23:32:12,425 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 23:32:12,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:12,425 INFO L225 Difference]: With dead ends: 75 [2021-05-02 23:32:12,425 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 23:32:12,425 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1404 ImplicationChecksByTransitivity, 2792.3ms TimeCoverageRelationStatistics Valid=485, Invalid=8071, Unknown=0, NotChecked=0, Total=8556 [2021-05-02 23:32:12,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 23:32:12,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2021-05-02 23:32:12,430 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 23:32:12,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2021-05-02 23:32:12,431 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 56 [2021-05-02 23:32:12,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:12,431 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2021-05-02 23:32:12,431 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 23:32:12,431 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2021-05-02 23:32:12,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 23:32:12,432 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:12,432 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 23:32:12,432 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2021-05-02 23:32:12,432 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:12,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:12,437 INFO L82 PathProgramCache]: Analyzing trace with hash 1680424454, now seen corresponding path program 36 times [2021-05-02 23:32:12,437 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:12,437 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [235585880] [2021-05-02 23:32:12,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:12,449 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_780 v_main_~n~0_43) InVars {main_~i~0=v_main_~i~0_780, main_~n~0=v_main_~n~0_43} OutVars{main_~i~0=v_main_~i~0_780, main_~n~0=v_main_~n~0_43} AuxVars[] AssignedVars[] [2021-05-02 23:32:12,453 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:12,467 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:12,472 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:12,484 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:12,502 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:12,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:12,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:12,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:12,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:12,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:12,585 INFO 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 23:32:13,820 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:13,820 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [235585880] [2021-05-02 23:32:13,820 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [235585880] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:13,820 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:13,820 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2021-05-02 23:32:13,820 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174004533] [2021-05-02 23:32:13,821 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 23:32:13,821 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:13,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 23:32:13,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=2215, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 23:32:13,821 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 23:32:16,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:16,658 INFO L93 Difference]: Finished difference Result 76 states and 79 transitions. [2021-05-02 23:32:16,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 23:32:16,659 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 23:32:16,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:16,659 INFO L225 Difference]: With dead ends: 76 [2021-05-02 23:32:16,659 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 23:32:16,660 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1546 ImplicationChecksByTransitivity, 3041.6ms TimeCoverageRelationStatistics Valid=423, Invalid=8507, Unknown=0, NotChecked=0, Total=8930 [2021-05-02 23:32:16,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 23:32:16,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2021-05-02 23:32:16,663 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 23:32:16,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2021-05-02 23:32:16,664 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 57 [2021-05-02 23:32:16,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:16,664 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2021-05-02 23:32:16,664 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 23:32:16,664 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2021-05-02 23:32:16,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 23:32:16,664 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:16,666 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 23:32:16,666 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-05-02 23:32:16,666 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:16,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:16,666 INFO L82 PathProgramCache]: Analyzing trace with hash -62352276, now seen corresponding path program 37 times [2021-05-02 23:32:16,666 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:16,666 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [365710750] [2021-05-02 23:32:16,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:16,695 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_820 v_main_~n~0_44) InVars {main_~i~0=v_main_~i~0_820, main_~n~0=v_main_~n~0_44} OutVars{main_~i~0=v_main_~i~0_820, main_~n~0=v_main_~n~0_44} AuxVars[] AssignedVars[] [2021-05-02 23:32:16,697 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:16,708 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:16,713 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:16,722 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:16,737 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:16,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:16,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:16,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:16,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:16,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:16,848 INFO 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 23:32:18,234 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:18,234 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [365710750] [2021-05-02 23:32:18,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [365710750] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:18,234 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:18,234 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2021-05-02 23:32:18,234 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205833755] [2021-05-02 23:32:18,235 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-02 23:32:18,235 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:18,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-02 23:32:18,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=2273, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 23:32:18,235 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 23:32:21,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:21,161 INFO L93 Difference]: Finished difference Result 77 states and 80 transitions. [2021-05-02 23:32:21,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 23:32:21,162 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 23:32:21,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:21,164 INFO L225 Difference]: With dead ends: 77 [2021-05-02 23:32:21,164 INFO L226 Difference]: Without dead ends: 63 [2021-05-02 23:32:21,164 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1517 ImplicationChecksByTransitivity, 3225.7ms TimeCoverageRelationStatistics Valid=507, Invalid=8805, Unknown=0, NotChecked=0, Total=9312 [2021-05-02 23:32:21,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-02 23:32:21,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2021-05-02 23:32:21,169 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 23:32:21,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2021-05-02 23:32:21,169 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 58 [2021-05-02 23:32:21,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:21,169 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2021-05-02 23:32:21,169 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 23:32:21,169 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2021-05-02 23:32:21,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 23:32:21,170 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:21,170 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 23:32:21,170 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-05-02 23:32:21,170 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:21,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:21,170 INFO L82 PathProgramCache]: Analyzing trace with hash 1746143942, now seen corresponding path program 38 times [2021-05-02 23:32:21,170 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:21,170 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [706189994] [2021-05-02 23:32:21,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:21,193 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_861 v_main_~n~0_45) InVars {main_~i~0=v_main_~i~0_861, main_~n~0=v_main_~n~0_45} OutVars{main_~i~0=v_main_~i~0_861, main_~n~0=v_main_~n~0_45} AuxVars[] AssignedVars[] [2021-05-02 23:32:21,195 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:21,195 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:21,200 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:21,220 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:21,234 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:21,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:21,301 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:21,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:21,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:21,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:21,306 INFO 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 23:32:22,644 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:22,644 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [706189994] [2021-05-02 23:32:22,645 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [706189994] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:22,645 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:22,645 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2021-05-02 23:32:22,645 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640717238] [2021-05-02 23:32:22,645 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 23:32:22,645 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:22,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 23:32:22,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2407, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 23:32:22,646 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 23:32:26,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:26,035 INFO L93 Difference]: Finished difference Result 78 states and 81 transitions. [2021-05-02 23:32:26,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 23:32:26,036 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 23:32:26,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:26,036 INFO L225 Difference]: With dead ends: 78 [2021-05-02 23:32:26,037 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 23:32:26,037 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1665 ImplicationChecksByTransitivity, 3373.8ms TimeCoverageRelationStatistics Valid=441, Invalid=9261, Unknown=0, NotChecked=0, Total=9702 [2021-05-02 23:32:26,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 23:32:26,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2021-05-02 23:32:26,043 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 23:32:26,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2021-05-02 23:32:26,043 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 59 [2021-05-02 23:32:26,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:26,043 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2021-05-02 23:32:26,043 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 23:32:26,043 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2021-05-02 23:32:26,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-02 23:32:26,044 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:26,044 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 23:32:26,044 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-05-02 23:32:26,044 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:26,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:26,044 INFO L82 PathProgramCache]: Analyzing trace with hash 1974951852, now seen corresponding path program 39 times [2021-05-02 23:32:26,044 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:26,044 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1189751956] [2021-05-02 23:32:26,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:26,048 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_903 v_main_~n~0_46) InVars {main_~i~0=v_main_~i~0_903, main_~n~0=v_main_~n~0_46} OutVars{main_~i~0=v_main_~i~0_903, main_~n~0=v_main_~n~0_46} AuxVars[] AssignedVars[] [2021-05-02 23:32:26,049 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:26,064 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:26,070 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:26,083 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:26,102 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:26,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:26,195 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:26,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:26,198 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:26,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:26,201 INFO 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 23:32:27,727 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:27,727 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1189751956] [2021-05-02 23:32:27,727 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1189751956] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:27,727 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:27,727 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2021-05-02 23:32:27,727 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599850990] [2021-05-02 23:32:27,728 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 23:32:27,728 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:27,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 23:32:27,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=2467, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 23:32:27,728 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 23:32:31,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:31,202 INFO L93 Difference]: Finished difference Result 79 states and 82 transitions. [2021-05-02 23:32:31,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-02 23:32:31,203 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 23:32:31,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:31,203 INFO L225 Difference]: With dead ends: 79 [2021-05-02 23:32:31,203 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 23:32:31,204 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1634 ImplicationChecksByTransitivity, 3670.4ms TimeCoverageRelationStatistics Valid=529, Invalid=9571, Unknown=0, NotChecked=0, Total=10100 [2021-05-02 23:32:31,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 23:32:31,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2021-05-02 23:32:31,208 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 23:32:31,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2021-05-02 23:32:31,208 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 60 [2021-05-02 23:32:31,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:31,209 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2021-05-02 23:32:31,209 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 23:32:31,209 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2021-05-02 23:32:31,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 23:32:31,209 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:31,209 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 23:32:31,209 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-05-02 23:32:31,209 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:31,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:31,209 INFO L82 PathProgramCache]: Analyzing trace with hash 478062470, now seen corresponding path program 40 times [2021-05-02 23:32:31,209 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:31,209 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1053833232] [2021-05-02 23:32:31,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:31,218 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_946 v_main_~n~0_47) InVars {main_~i~0=v_main_~i~0_946, main_~n~0=v_main_~n~0_47} OutVars{main_~i~0=v_main_~i~0_946, main_~n~0=v_main_~n~0_47} AuxVars[] AssignedVars[] [2021-05-02 23:32:31,219 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:31,230 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:31,235 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:31,244 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:31,259 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:31,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:31,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:31,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:31,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:31,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:31,331 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:32,505 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:32,505 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1053833232] [2021-05-02 23:32:32,505 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1053833232] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:32,505 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:32,505 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2021-05-02 23:32:32,505 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197051398] [2021-05-02 23:32:32,505 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 23:32:32,506 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:32,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 23:32:32,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=2567, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 23:32:32,506 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 23:32:35,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:35,820 INFO L93 Difference]: Finished difference Result 80 states and 83 transitions. [2021-05-02 23:32:35,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 23:32:35,821 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 23:32:35,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:35,821 INFO L225 Difference]: With dead ends: 80 [2021-05-02 23:32:35,821 INFO L226 Difference]: Without dead ends: 66 [2021-05-02 23:32:35,822 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1694 ImplicationChecksByTransitivity, 3289.2ms TimeCoverageRelationStatistics Valid=540, Invalid=9966, Unknown=0, NotChecked=0, Total=10506 [2021-05-02 23:32:35,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-02 23:32:35,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2021-05-02 23:32:35,826 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 23:32:35,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 66 transitions. [2021-05-02 23:32:35,826 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 66 transitions. Word has length 61 [2021-05-02 23:32:35,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:35,827 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 66 transitions. [2021-05-02 23:32:35,827 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 23:32:35,827 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 66 transitions. [2021-05-02 23:32:35,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 23:32:35,827 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:35,827 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 23:32:35,827 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-05-02 23:32:35,827 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:35,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:35,827 INFO L82 PathProgramCache]: Analyzing trace with hash 1319131884, now seen corresponding path program 41 times [2021-05-02 23:32:35,828 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:35,828 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1141165937] [2021-05-02 23:32:35,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:35,831 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_990 v_main_~n~0_48) InVars {main_~i~0=v_main_~i~0_990, main_~n~0=v_main_~n~0_48} OutVars{main_~i~0=v_main_~i~0_990, main_~n~0=v_main_~n~0_48} AuxVars[] AssignedVars[] [2021-05-02 23:32:35,844 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:35,845 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:35,851 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:35,885 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:35,903 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:35,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:35,995 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:35,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:35,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:36,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:36,001 INFO 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 23:32:37,670 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:37,671 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1141165937] [2021-05-02 23:32:37,671 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1141165937] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:37,671 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:37,671 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2021-05-02 23:32:37,671 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798543950] [2021-05-02 23:32:37,671 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-02 23:32:37,671 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:37,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-02 23:32:37,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=2710, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 23:32:37,672 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 23:32:40,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:40,958 INFO L93 Difference]: Finished difference Result 81 states and 84 transitions. [2021-05-02 23:32:40,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-02 23:32:40,959 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 23:32:40,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:40,959 INFO L225 Difference]: With dead ends: 81 [2021-05-02 23:32:40,959 INFO L226 Difference]: Without dead ends: 67 [2021-05-02 23:32:40,960 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1851 ImplicationChecksByTransitivity, 3646.7ms TimeCoverageRelationStatistics Valid=468, Invalid=10452, Unknown=0, NotChecked=0, Total=10920 [2021-05-02 23:32:40,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-05-02 23:32:40,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2021-05-02 23:32:40,963 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 23:32:40,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2021-05-02 23:32:40,963 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 62 [2021-05-02 23:32:40,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:40,964 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2021-05-02 23:32:40,964 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 23:32:40,964 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2021-05-02 23:32:40,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 23:32:40,964 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:40,964 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 23:32:40,964 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2021-05-02 23:32:40,964 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:40,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:40,964 INFO L82 PathProgramCache]: Analyzing trace with hash 1622479942, now seen corresponding path program 42 times [2021-05-02 23:32:40,964 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:40,964 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1683160622] [2021-05-02 23:32:40,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:40,968 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1035 v_main_~n~0_49) InVars {main_~i~0=v_main_~i~0_1035, main_~n~0=v_main_~n~0_49} OutVars{main_~i~0=v_main_~i~0_1035, main_~n~0=v_main_~n~0_49} AuxVars[] AssignedVars[] [2021-05-02 23:32:40,969 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:40,970 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:40,990 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:41,012 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:41,029 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:41,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:41,112 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:41,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:41,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:41,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:41,117 INFO 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 23:32:42,710 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:42,710 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1683160622] [2021-05-02 23:32:42,710 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1683160622] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:42,710 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:42,710 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2021-05-02 23:32:42,710 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590879905] [2021-05-02 23:32:42,711 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-02 23:32:42,711 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:42,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-02 23:32:42,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=2816, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 23:32:42,711 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 23:32:46,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:46,219 INFO L93 Difference]: Finished difference Result 82 states and 85 transitions. [2021-05-02 23:32:46,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 23:32:46,220 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 23:32:46,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:46,220 INFO L225 Difference]: With dead ends: 82 [2021-05-02 23:32:46,220 INFO L226 Difference]: Without dead ends: 68 [2021-05-02 23:32:46,221 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1817 ImplicationChecksByTransitivity, 3838.9ms TimeCoverageRelationStatistics Valid=476, Invalid=10866, Unknown=0, NotChecked=0, Total=11342 [2021-05-02 23:32:46,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-02 23:32:46,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2021-05-02 23:32:46,225 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 23:32:46,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2021-05-02 23:32:46,225 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 63 [2021-05-02 23:32:46,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:46,225 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2021-05-02 23:32:46,225 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 23:32:46,225 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2021-05-02 23:32:46,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-02 23:32:46,226 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:46,226 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 23:32:46,226 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2021-05-02 23:32:46,226 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:46,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:46,226 INFO L82 PathProgramCache]: Analyzing trace with hash -1858632148, now seen corresponding path program 43 times [2021-05-02 23:32:46,226 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:46,226 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1575609223] [2021-05-02 23:32:46,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:46,229 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1081 v_main_~n~0_50) InVars {main_~i~0=v_main_~i~0_1081, main_~n~0=v_main_~n~0_50} OutVars{main_~i~0=v_main_~i~0_1081, main_~n~0=v_main_~n~0_50} AuxVars[] AssignedVars[] [2021-05-02 23:32:46,231 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:46,231 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:46,236 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:46,258 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:46,274 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:46,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:46,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:46,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:46,370 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:46,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:46,371 INFO 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 23:32:48,057 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:48,057 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1575609223] [2021-05-02 23:32:48,057 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1575609223] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:48,057 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:48,057 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2021-05-02 23:32:48,057 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068998750] [2021-05-02 23:32:48,058 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-02 23:32:48,058 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:48,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-02 23:32:48,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=2879, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 23:32:48,058 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 23:32:51,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:51,698 INFO L93 Difference]: Finished difference Result 83 states and 86 transitions. [2021-05-02 23:32:51,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-02 23:32:51,698 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 23:32:51,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:51,699 INFO L225 Difference]: With dead ends: 83 [2021-05-02 23:32:51,699 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 23:32:51,699 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1880 ImplicationChecksByTransitivity, 3988.0ms TimeCoverageRelationStatistics Valid=573, Invalid=11199, Unknown=0, NotChecked=0, Total=11772 [2021-05-02 23:32:51,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 23:32:51,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2021-05-02 23:32:51,703 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 23:32:51,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 69 transitions. [2021-05-02 23:32:51,704 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 69 transitions. Word has length 64 [2021-05-02 23:32:51,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:51,704 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 69 transitions. [2021-05-02 23:32:51,704 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 23:32:51,704 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 69 transitions. [2021-05-02 23:32:51,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 23:32:51,704 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:51,704 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 23:32:51,704 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-05-02 23:32:51,704 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:51,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:51,705 INFO L82 PathProgramCache]: Analyzing trace with hash 1896042758, now seen corresponding path program 44 times [2021-05-02 23:32:51,705 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:51,705 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [359225016] [2021-05-02 23:32:51,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:51,708 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1128 v_main_~n~0_51) InVars {main_~i~0=v_main_~i~0_1128, main_~n~0=v_main_~n~0_51} OutVars{main_~i~0=v_main_~i~0_1128, main_~n~0=v_main_~n~0_51} AuxVars[] AssignedVars[] [2021-05-02 23:32:51,709 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:51,723 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:51,730 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:51,744 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:51,766 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:51,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:51,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:51,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:51,865 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:51,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:51,867 INFO 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 23:32:53,571 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:53,571 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [359225016] [2021-05-02 23:32:53,571 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [359225016] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:53,571 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:53,571 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [55] imperfect sequences [] total 55 [2021-05-02 23:32:53,571 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32427872] [2021-05-02 23:32:53,571 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-02 23:32:53,571 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:53,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-02 23:32:53,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=2987, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 23:32:53,572 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 23:32:57,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:57,521 INFO L93 Difference]: Finished difference Result 84 states and 87 transitions. [2021-05-02 23:32:57,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-02 23:32:57,522 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 23:32:57,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:57,522 INFO L225 Difference]: With dead ends: 84 [2021-05-02 23:32:57,522 INFO L226 Difference]: Without dead ends: 70 [2021-05-02 23:32:57,523 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1944 ImplicationChecksByTransitivity, 4137.6ms TimeCoverageRelationStatistics Valid=584, Invalid=11626, Unknown=0, NotChecked=0, Total=12210 [2021-05-02 23:32:57,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-05-02 23:32:57,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2021-05-02 23:32:57,527 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 23:32:57,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2021-05-02 23:32:57,527 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 65 [2021-05-02 23:32:57,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:57,528 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2021-05-02 23:32:57,528 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 23:32:57,528 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2021-05-02 23:32:57,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-02 23:32:57,528 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:57,528 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 23:32:57,528 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2021-05-02 23:32:57,528 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:57,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:57,528 INFO L82 PathProgramCache]: Analyzing trace with hash -1968119444, now seen corresponding path program 45 times [2021-05-02 23:32:57,528 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:57,528 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1435006196] [2021-05-02 23:32:57,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:57,541 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1176 v_main_~n~0_52) InVars {main_~i~0=v_main_~i~0_1176, main_~n~0=v_main_~n~0_52} OutVars{main_~i~0=v_main_~i~0_1176, main_~n~0=v_main_~n~0_52} AuxVars[] AssignedVars[] [2021-05-02 23:32:57,542 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:57,556 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:57,561 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:57,573 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:57,591 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:57,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:57,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:57,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:57,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:57,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:57,681 INFO 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 23:32:59,438 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:59,438 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1435006196] [2021-05-02 23:32:59,438 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1435006196] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:59,438 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:59,438 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [56] imperfect sequences [] total 56 [2021-05-02 23:32:59,438 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1833219564] [2021-05-02 23:32:59,438 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-02 23:32:59,438 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:59,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-02 23:32:59,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=3097, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 23:32:59,439 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 23:33:03,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:03,363 INFO L93 Difference]: Finished difference Result 85 states and 88 transitions. [2021-05-02 23:33:03,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-02 23:33:03,364 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 23:33:03,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:03,364 INFO L225 Difference]: With dead ends: 85 [2021-05-02 23:33:03,364 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 23:33:03,365 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2009 ImplicationChecksByTransitivity, 4213.6ms TimeCoverageRelationStatistics Valid=595, Invalid=12061, Unknown=0, NotChecked=0, Total=12656 [2021-05-02 23:33:03,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 23:33:03,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2021-05-02 23:33:03,369 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 23:33:03,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 71 transitions. [2021-05-02 23:33:03,369 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 71 transitions. Word has length 66 [2021-05-02 23:33:03,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:03,369 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 71 transitions. [2021-05-02 23:33:03,369 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 23:33:03,370 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 71 transitions. [2021-05-02 23:33:03,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-02 23:33:03,370 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:03,370 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 23:33:03,370 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2021-05-02 23:33:03,370 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:03,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:03,370 INFO L82 PathProgramCache]: Analyzing trace with hash -1498063418, now seen corresponding path program 46 times [2021-05-02 23:33:03,370 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:03,370 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [589354315] [2021-05-02 23:33:03,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:03,374 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1225 v_main_~n~0_53) InVars {main_~i~0=v_main_~i~0_1225, main_~n~0=v_main_~n~0_53} OutVars{main_~i~0=v_main_~i~0_1225, main_~n~0=v_main_~n~0_53} AuxVars[] AssignedVars[] [2021-05-02 23:33:03,375 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:33:03,376 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:03,381 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:33:03,403 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:33:03,420 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:03,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:03,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:03,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:03,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:33:03,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:03,507 INFO 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 23:33:05,404 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:05,404 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [589354315] [2021-05-02 23:33:05,405 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [589354315] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:05,405 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:05,405 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2021-05-02 23:33:05,405 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1858417793] [2021-05-02 23:33:05,405 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-02 23:33:05,405 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:05,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-02 23:33:05,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=3209, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 23:33:05,406 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 23:33:10,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:10,368 INFO L93 Difference]: Finished difference Result 86 states and 89 transitions. [2021-05-02 23:33:10,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-02 23:33:10,369 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 23:33:10,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:10,370 INFO L225 Difference]: With dead ends: 86 [2021-05-02 23:33:10,370 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 23:33:10,371 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2075 ImplicationChecksByTransitivity, 4963.6ms TimeCoverageRelationStatistics Valid=606, Invalid=12504, Unknown=0, NotChecked=0, Total=13110 [2021-05-02 23:33:10,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 23:33:10,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2021-05-02 23:33:10,375 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 23:33:10,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2021-05-02 23:33:10,376 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 67 [2021-05-02 23:33:10,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:10,376 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2021-05-02 23:33:10,376 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 23:33:10,376 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2021-05-02 23:33:10,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 23:33:10,376 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:10,376 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 23:33:10,376 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2021-05-02 23:33:10,376 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:10,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:10,377 INFO L82 PathProgramCache]: Analyzing trace with hash 188771500, now seen corresponding path program 47 times [2021-05-02 23:33:10,377 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:10,377 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1494992427] [2021-05-02 23:33:10,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:10,381 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1275 v_main_~n~0_54) InVars {main_~i~0=v_main_~i~0_1275, main_~n~0=v_main_~n~0_54} OutVars{main_~i~0=v_main_~i~0_1275, main_~n~0=v_main_~n~0_54} AuxVars[] AssignedVars[] [2021-05-02 23:33:10,382 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:33:10,397 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:10,403 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:33:10,416 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:33:10,435 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:10,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:10,528 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:10,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:10,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:33:10,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:10,534 INFO 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 23:33:12,527 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:12,527 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1494992427] [2021-05-02 23:33:12,527 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1494992427] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:12,527 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:12,527 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [58] imperfect sequences [] total 58 [2021-05-02 23:33:12,527 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826563153] [2021-05-02 23:33:12,528 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-02 23:33:12,528 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:12,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-02 23:33:12,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=3370, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 23:33:12,528 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 23:33:17,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:17,660 INFO L93 Difference]: Finished difference Result 87 states and 90 transitions. [2021-05-02 23:33:17,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-05-02 23:33:17,661 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 23:33:17,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:17,661 INFO L225 Difference]: With dead ends: 87 [2021-05-02 23:33:17,661 INFO L226 Difference]: Without dead ends: 73 [2021-05-02 23:33:17,662 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2250 ImplicationChecksByTransitivity, 5142.5ms TimeCoverageRelationStatistics Valid=522, Invalid=13050, Unknown=0, NotChecked=0, Total=13572 [2021-05-02 23:33:17,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-02 23:33:17,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2021-05-02 23:33:17,667 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 23:33:17,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2021-05-02 23:33:17,667 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 68 [2021-05-02 23:33:17,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:17,668 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2021-05-02 23:33:17,668 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 23:33:17,668 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2021-05-02 23:33:17,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-02 23:33:17,668 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:17,668 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 23:33:17,668 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2021-05-02 23:33:17,668 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:17,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:17,668 INFO L82 PathProgramCache]: Analyzing trace with hash 941046406, now seen corresponding path program 48 times [2021-05-02 23:33:17,669 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:17,669 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1502873082] [2021-05-02 23:33:17,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:17,673 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1326 v_main_~n~0_55) InVars {main_~i~0=v_main_~i~0_1326, main_~n~0=v_main_~n~0_55} OutVars{main_~i~0=v_main_~i~0_1326, main_~n~0=v_main_~n~0_55} AuxVars[] AssignedVars[] [2021-05-02 23:33:17,675 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:33:17,691 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:17,697 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:33:17,710 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:33:17,730 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:17,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:17,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:17,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:17,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:33:17,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:17,833 INFO 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 23:33:20,106 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:20,107 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1502873082] [2021-05-02 23:33:20,107 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1502873082] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:20,107 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:20,107 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [59] imperfect sequences [] total 59 [2021-05-02 23:33:20,107 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729736389] [2021-05-02 23:33:20,107 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-02 23:33:20,107 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:20,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-02 23:33:20,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=3487, Unknown=0, NotChecked=0, Total=3660 [2021-05-02 23:33:20,108 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 23:33:25,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:25,705 INFO L93 Difference]: Finished difference Result 88 states and 91 transitions. [2021-05-02 23:33:25,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-02 23:33:25,707 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 23:33:25,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:25,707 INFO L225 Difference]: With dead ends: 88 [2021-05-02 23:33:25,707 INFO L226 Difference]: Without dead ends: 74 [2021-05-02 23:33:25,708 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2320 ImplicationChecksByTransitivity, 5720.3ms TimeCoverageRelationStatistics Valid=531, Invalid=13511, Unknown=0, NotChecked=0, Total=14042 [2021-05-02 23:33:25,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-02 23:33:25,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2021-05-02 23:33:25,713 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 23:33:25,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 74 transitions. [2021-05-02 23:33:25,714 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 74 transitions. Word has length 69 [2021-05-02 23:33:25,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:25,714 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 74 transitions. [2021-05-02 23:33:25,714 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 23:33:25,714 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 74 transitions. [2021-05-02 23:33:25,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-02 23:33:25,714 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:25,714 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 23:33:25,714 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2021-05-02 23:33:25,714 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:25,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:25,715 INFO L82 PathProgramCache]: Analyzing trace with hash -1508235284, now seen corresponding path program 49 times [2021-05-02 23:33:25,715 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:25,715 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1501228504] [2021-05-02 23:33:25,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:25,719 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1378 v_main_~n~0_56) InVars {main_~i~0=v_main_~i~0_1378, main_~n~0=v_main_~n~0_56} OutVars{main_~i~0=v_main_~i~0_1378, main_~n~0=v_main_~n~0_56} AuxVars[] AssignedVars[] [2021-05-02 23:33:25,721 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:33:25,737 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:25,744 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:33:25,757 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:33:25,777 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:25,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:25,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:25,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:25,881 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:33:25,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:25,884 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 23:33:28,333 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:28,333 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1501228504] [2021-05-02 23:33:28,333 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1501228504] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:28,333 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:28,333 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [60] imperfect sequences [] total 60 [2021-05-02 23:33:28,333 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171501621] [2021-05-02 23:33:28,333 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-02 23:33:28,333 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:28,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-02 23:33:28,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=3606, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 23:33:28,334 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 23:33:33,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:33,754 INFO L93 Difference]: Finished difference Result 89 states and 92 transitions. [2021-05-02 23:33:33,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-02 23:33:33,755 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 23:33:33,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:33,756 INFO L225 Difference]: With dead ends: 89 [2021-05-02 23:33:33,756 INFO L226 Difference]: Without dead ends: 75 [2021-05-02 23:33:33,757 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2391 ImplicationChecksByTransitivity, 5754.7ms TimeCoverageRelationStatistics Valid=540, Invalid=13980, Unknown=0, NotChecked=0, Total=14520 [2021-05-02 23:33:33,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-05-02 23:33:33,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2021-05-02 23:33:33,761 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 23:33:33,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 75 transitions. [2021-05-02 23:33:33,762 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 75 transitions. Word has length 70 [2021-05-02 23:33:33,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:33,762 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 75 transitions. [2021-05-02 23:33:33,762 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 23:33:33,762 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 75 transitions. [2021-05-02 23:33:33,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 23:33:33,762 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:33,763 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 23:33:33,763 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2021-05-02 23:33:33,763 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:33,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:33,763 INFO L82 PathProgramCache]: Analyzing trace with hash -126556346, now seen corresponding path program 50 times [2021-05-02 23:33:33,763 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:33,763 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [286403834] [2021-05-02 23:33:33,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:33,767 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1431 v_main_~n~0_57) InVars {main_~i~0=v_main_~i~0_1431, main_~n~0=v_main_~n~0_57} OutVars{main_~i~0=v_main_~i~0_1431, main_~n~0=v_main_~n~0_57} AuxVars[] AssignedVars[] [2021-05-02 23:33:33,769 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:33:33,785 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:33,791 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:33:33,805 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:33:33,826 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:33,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:33,920 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:33,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:33,923 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:33:33,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:33,926 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:33:35,954 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:35,955 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [286403834] [2021-05-02 23:33:35,955 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [286403834] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:35,955 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:35,955 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [61] imperfect sequences [] total 61 [2021-05-02 23:33:35,955 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077263114] [2021-05-02 23:33:35,955 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2021-05-02 23:33:35,955 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:35,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-05-02 23:33:35,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=3727, Unknown=0, NotChecked=0, Total=3906 [2021-05-02 23:33:35,956 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 23:33:40,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:40,734 INFO L93 Difference]: Finished difference Result 90 states and 93 transitions. [2021-05-02 23:33:40,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-02 23:33:40,735 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 23:33:40,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:40,735 INFO L225 Difference]: With dead ends: 90 [2021-05-02 23:33:40,735 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 23:33:40,736 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2463 ImplicationChecksByTransitivity, 4975.5ms TimeCoverageRelationStatistics Valid=549, Invalid=14457, Unknown=0, NotChecked=0, Total=15006 [2021-05-02 23:33:40,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 23:33:40,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2021-05-02 23:33:40,740 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 23:33:40,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2021-05-02 23:33:40,740 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 71 [2021-05-02 23:33:40,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:40,741 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2021-05-02 23:33:40,741 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 23:33:40,741 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2021-05-02 23:33:40,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-02 23:33:40,741 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:40,741 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 23:33:40,741 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2021-05-02 23:33:40,741 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:40,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:40,741 INFO L82 PathProgramCache]: Analyzing trace with hash -244182228, now seen corresponding path program 51 times [2021-05-02 23:33:40,741 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:40,741 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1054993220] [2021-05-02 23:33:40,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:40,752 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1485 v_main_~n~0_58) InVars {main_~i~0=v_main_~i~0_1485, main_~n~0=v_main_~n~0_58} OutVars{main_~i~0=v_main_~i~0_1485, main_~n~0=v_main_~n~0_58} AuxVars[] AssignedVars[] [2021-05-02 23:33:40,755 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:33:40,756 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:40,762 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:33:40,783 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:33:40,799 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:40,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:40,938 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:40,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:40,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:33:40,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:40,945 INFO 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 23:33:43,186 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:43,186 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1054993220] [2021-05-02 23:33:43,186 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1054993220] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:43,186 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:43,186 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [62] imperfect sequences [] total 62 [2021-05-02 23:33:43,186 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367136643] [2021-05-02 23:33:43,186 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-02 23:33:43,186 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:43,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-02 23:33:43,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=3799, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 23:33:43,187 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 23:33:47,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:47,984 INFO L93 Difference]: Finished difference Result 91 states and 94 transitions. [2021-05-02 23:33:47,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-05-02 23:33:47,995 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 23:33:47,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:47,996 INFO L225 Difference]: With dead ends: 91 [2021-05-02 23:33:47,996 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 23:33:47,996 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2420 ImplicationChecksByTransitivity, 5198.7ms TimeCoverageRelationStatistics Valid=661, Invalid=14839, Unknown=0, NotChecked=0, Total=15500 [2021-05-02 23:33:47,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 23:33:48,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2021-05-02 23:33:48,001 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 23:33:48,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 77 transitions. [2021-05-02 23:33:48,001 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 77 transitions. Word has length 72 [2021-05-02 23:33:48,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:48,002 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 77 transitions. [2021-05-02 23:33:48,002 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 23:33:48,002 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 77 transitions. [2021-05-02 23:33:48,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 23:33:48,002 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:48,002 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 23:33:48,002 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2021-05-02 23:33:48,002 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:48,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:48,002 INFO L82 PathProgramCache]: Analyzing trace with hash 404382726, now seen corresponding path program 52 times [2021-05-02 23:33:48,002 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:48,003 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [18186044] [2021-05-02 23:33:48,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:48,022 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1540 v_main_~n~0_59) InVars {main_~i~0=v_main_~i~0_1540, main_~n~0=v_main_~n~0_59} OutVars{main_~i~0=v_main_~i~0_1540, main_~n~0=v_main_~n~0_59} AuxVars[] AssignedVars[] [2021-05-02 23:33:48,024 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:33:48,025 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:48,032 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:33:48,063 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:33:48,089 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:48,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:48,229 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:48,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:48,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:33:48,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:48,237 INFO 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 23:33:50,510 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:50,511 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [18186044] [2021-05-02 23:33:50,511 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [18186044] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:50,511 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:50,511 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [63] imperfect sequences [] total 63 [2021-05-02 23:33:50,511 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020911421] [2021-05-02 23:33:50,511 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-02 23:33:50,511 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:50,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-02 23:33:50,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=3923, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 23:33:50,512 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 23:33:55,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:55,768 INFO L93 Difference]: Finished difference Result 92 states and 95 transitions. [2021-05-02 23:33:55,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-05-02 23:33:55,768 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 23:33:55,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:55,769 INFO L225 Difference]: With dead ends: 92 [2021-05-02 23:33:55,769 INFO L226 Difference]: Without dead ends: 78 [2021-05-02 23:33:55,770 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2492 ImplicationChecksByTransitivity, 5463.0ms TimeCoverageRelationStatistics Valid=672, Invalid=15330, Unknown=0, NotChecked=0, Total=16002 [2021-05-02 23:33:55,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-02 23:33:55,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2021-05-02 23:33:55,774 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 23:33:55,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 78 transitions. [2021-05-02 23:33:55,775 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 78 transitions. Word has length 73 [2021-05-02 23:33:55,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:55,775 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 78 transitions. [2021-05-02 23:33:55,775 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 23:33:55,775 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 78 transitions. [2021-05-02 23:33:55,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-02 23:33:55,775 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:55,775 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 23:33:55,775 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2021-05-02 23:33:55,775 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:55,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:55,776 INFO L82 PathProgramCache]: Analyzing trace with hash -964940180, now seen corresponding path program 53 times [2021-05-02 23:33:55,776 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:55,776 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1007094714] [2021-05-02 23:33:55,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:55,800 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1596 v_main_~n~0_60) InVars {main_~i~0=v_main_~i~0_1596, main_~n~0=v_main_~n~0_60} OutVars{main_~i~0=v_main_~i~0_1596, main_~n~0=v_main_~n~0_60} AuxVars[] AssignedVars[] [2021-05-02 23:33:55,801 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:33:55,815 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:55,821 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:33:55,844 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:33:55,870 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:55,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:55,993 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:55,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:55,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:33:55,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:55,997 INFO 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 23:33:59,128 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:59,128 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1007094714] [2021-05-02 23:33:59,129 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1007094714] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:59,129 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:59,129 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [64] imperfect sequences [] total 64 [2021-05-02 23:33:59,129 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2106083952] [2021-05-02 23:33:59,129 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-02 23:33:59,129 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:59,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-02 23:33:59,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=4102, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 23:33:59,130 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 23:34:06,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:34:06,090 INFO L93 Difference]: Finished difference Result 93 states and 96 transitions. [2021-05-02 23:34:06,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-05-02 23:34:06,091 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 23:34:06,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:34:06,092 INFO L225 Difference]: With dead ends: 93 [2021-05-02 23:34:06,092 INFO L226 Difference]: Without dead ends: 79 [2021-05-02 23:34:06,092 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2685 ImplicationChecksByTransitivity, 7281.6ms TimeCoverageRelationStatistics Valid=576, Invalid=15936, Unknown=0, NotChecked=0, Total=16512 [2021-05-02 23:34:06,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-02 23:34:06,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2021-05-02 23:34:06,098 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 23:34:06,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2021-05-02 23:34:06,098 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 74 [2021-05-02 23:34:06,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:34:06,098 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2021-05-02 23:34:06,098 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 23:34:06,098 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2021-05-02 23:34:06,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 23:34:06,099 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:34:06,099 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 23:34:06,099 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2021-05-02 23:34:06,099 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:34:06,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:34:06,099 INFO L82 PathProgramCache]: Analyzing trace with hash -464277306, now seen corresponding path program 54 times [2021-05-02 23:34:06,099 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:34:06,099 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [429392118] [2021-05-02 23:34:06,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:34:06,105 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1653 v_main_~n~0_61) InVars {main_~i~0=v_main_~i~0_1653, main_~n~0=v_main_~n~0_61} OutVars{main_~i~0=v_main_~i~0_1653, main_~n~0=v_main_~n~0_61} AuxVars[] AssignedVars[] [2021-05-02 23:34:06,106 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:34:06,107 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:34:06,113 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:34:06,132 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:34:06,147 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:34:06,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:06,219 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:34:06,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:06,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:34:06,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:06,230 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:34:08,999 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:34:09,000 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [429392118] [2021-05-02 23:34:09,000 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [429392118] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:34:09,000 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:34:09,000 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [65] imperfect sequences [] total 65 [2021-05-02 23:34:09,000 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665631879] [2021-05-02 23:34:09,000 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-02 23:34:09,000 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:34:09,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-02 23:34:09,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=4177, Unknown=0, NotChecked=0, Total=4422 [2021-05-02 23:34:09,001 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 23:34:14,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:34:14,536 INFO L93 Difference]: Finished difference Result 94 states and 97 transitions. [2021-05-02 23:34:14,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-05-02 23:34:14,537 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 23:34:14,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:34:14,537 INFO L225 Difference]: With dead ends: 94 [2021-05-02 23:34:14,537 INFO L226 Difference]: Without dead ends: 80 [2021-05-02 23:34:14,538 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2639 ImplicationChecksByTransitivity, 6002.1ms TimeCoverageRelationStatistics Valid=694, Invalid=16336, Unknown=0, NotChecked=0, Total=17030 [2021-05-02 23:34:14,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-05-02 23:34:14,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2021-05-02 23:34:14,543 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 23:34:14,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2021-05-02 23:34:14,543 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 75 [2021-05-02 23:34:14,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:34:14,543 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2021-05-02 23:34:14,543 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 23:34:14,543 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2021-05-02 23:34:14,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-02 23:34:14,544 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:34:14,544 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 23:34:14,544 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2021-05-02 23:34:14,544 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:34:14,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:34:14,544 INFO L82 PathProgramCache]: Analyzing trace with hash -2123597396, now seen corresponding path program 55 times [2021-05-02 23:34:14,544 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:34:14,544 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [555275925] [2021-05-02 23:34:14,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:34:14,554 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1711 v_main_~n~0_62) InVars {main_~i~0=v_main_~i~0_1711, main_~n~0=v_main_~n~0_62} OutVars{main_~i~0=v_main_~i~0_1711, main_~n~0=v_main_~n~0_62} AuxVars[] AssignedVars[] [2021-05-02 23:34:14,555 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:34:14,573 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:34:14,581 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:34:14,596 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:34:14,620 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:34:14,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:14,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:34:14,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:14,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:34:14,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:14,738 INFO 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 23:34:18,163 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:34:18,163 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [555275925] [2021-05-02 23:34:18,163 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [555275925] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:34:18,163 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:34:18,163 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [66] imperfect sequences [] total 66 [2021-05-02 23:34:18,163 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143709686] [2021-05-02 23:34:18,163 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-02 23:34:18,163 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:34:18,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-02 23:34:18,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=4307, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 23:34:18,164 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 23:34:24,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:34:24,337 INFO L93 Difference]: Finished difference Result 95 states and 98 transitions. [2021-05-02 23:34:24,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-05-02 23:34:24,339 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 23:34:24,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:34:24,339 INFO L225 Difference]: With dead ends: 95 [2021-05-02 23:34:24,339 INFO L226 Difference]: Without dead ends: 81 [2021-05-02 23:34:24,340 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2714 ImplicationChecksByTransitivity, 6974.0ms TimeCoverageRelationStatistics Valid=705, Invalid=16851, Unknown=0, NotChecked=0, Total=17556 [2021-05-02 23:34:24,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-05-02 23:34:24,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2021-05-02 23:34:24,345 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 23:34:24,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2021-05-02 23:34:24,345 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 76 [2021-05-02 23:34:24,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:34:24,345 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2021-05-02 23:34:24,345 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 23:34:24,345 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2021-05-02 23:34:24,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-02 23:34:24,346 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:34:24,346 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 23:34:24,346 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2021-05-02 23:34:24,346 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:34:24,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:34:24,346 INFO L82 PathProgramCache]: Analyzing trace with hash -2022912634, now seen corresponding path program 56 times [2021-05-02 23:34:24,346 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:34:24,346 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [148731450] [2021-05-02 23:34:24,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:34:24,375 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1770 v_main_~n~0_63) InVars {main_~i~0=v_main_~i~0_1770, main_~n~0=v_main_~n~0_63} OutVars{main_~i~0=v_main_~i~0_1770, main_~n~0=v_main_~n~0_63} AuxVars[] AssignedVars[] [2021-05-02 23:34:24,376 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:34:24,377 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:34:24,384 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:34:24,418 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:34:24,443 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:34:24,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:24,558 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:34:24,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:24,561 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:34:24,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:24,564 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:34:27,891 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:34:27,892 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [148731450] [2021-05-02 23:34:27,892 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [148731450] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:34:27,892 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:34:27,892 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [67] imperfect sequences [] total 67 [2021-05-02 23:34:27,892 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154974407] [2021-05-02 23:34:27,892 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2021-05-02 23:34:27,892 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:34:27,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-05-02 23:34:27,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=4496, Unknown=0, NotChecked=0, Total=4692 [2021-05-02 23:34:27,893 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 23:34:33,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:34:33,792 INFO L93 Difference]: Finished difference Result 96 states and 99 transitions. [2021-05-02 23:34:33,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-05-02 23:34:33,793 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 23:34:33,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:34:33,794 INFO L225 Difference]: With dead ends: 96 [2021-05-02 23:34:33,794 INFO L226 Difference]: Without dead ends: 82 [2021-05-02 23:34:33,794 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2790 ImplicationChecksByTransitivity, 6864.5ms TimeCoverageRelationStatistics Valid=602, Invalid=17488, Unknown=0, NotChecked=0, Total=18090 [2021-05-02 23:34:33,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-02 23:34:33,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2021-05-02 23:34:33,799 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 23:34:33,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 82 transitions. [2021-05-02 23:34:33,799 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 82 transitions. Word has length 77 [2021-05-02 23:34:33,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:34:33,800 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 82 transitions. [2021-05-02 23:34:33,800 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 23:34:33,800 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 82 transitions. [2021-05-02 23:34:33,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-02 23:34:33,800 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:34:33,800 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 23:34:33,800 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2021-05-02 23:34:33,800 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:34:33,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:34:33,813 INFO L82 PathProgramCache]: Analyzing trace with hash 1098314988, now seen corresponding path program 57 times [2021-05-02 23:34:33,813 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:34:33,813 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [492203820] [2021-05-02 23:34:33,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:34:33,829 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1830 v_main_~n~0_64) InVars {main_~i~0=v_main_~i~0_1830, main_~n~0=v_main_~n~0_64} OutVars{main_~i~0=v_main_~i~0_1830, main_~n~0=v_main_~n~0_64} AuxVars[] AssignedVars[] [2021-05-02 23:34:33,831 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:34:33,847 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:34:33,854 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:34:33,867 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:34:33,892 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:34:33,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:34,106 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:34:34,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:34,109 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:34:34,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:34,112 INFO 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 23:34:38,547 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:34:38,547 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [492203820] [2021-05-02 23:34:38,547 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [492203820] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:34:38,547 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:34:38,547 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [68] imperfect sequences [] total 68 [2021-05-02 23:34:38,547 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335790357] [2021-05-02 23:34:38,548 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2021-05-02 23:34:38,548 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:34:38,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-05-02 23:34:38,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=4630, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 23:34:38,549 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 23:34:44,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:34:44,880 INFO L93 Difference]: Finished difference Result 97 states and 100 transitions. [2021-05-02 23:34:44,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-05-02 23:34:44,881 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 23:34:44,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:34:44,881 INFO L225 Difference]: With dead ends: 97 [2021-05-02 23:34:44,881 INFO L226 Difference]: Without dead ends: 83 [2021-05-02 23:34:44,882 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2995 ImplicationChecksByTransitivity, 8148.8ms TimeCoverageRelationStatistics Valid=612, Invalid=18020, Unknown=0, NotChecked=0, Total=18632 [2021-05-02 23:34:44,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-02 23:34:44,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 82. [2021-05-02 23:34:44,887 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 23:34:44,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2021-05-02 23:34:44,887 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 78 [2021-05-02 23:34:44,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:34:44,887 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2021-05-02 23:34:44,888 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 23:34:44,888 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2021-05-02 23:34:44,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-02 23:34:44,888 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:34:44,888 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 23:34:44,888 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2021-05-02 23:34:44,888 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:34:44,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:34:44,900 INFO L82 PathProgramCache]: Analyzing trace with hash -927876538, now seen corresponding path program 58 times [2021-05-02 23:34:44,900 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:34:44,900 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [333908142] [2021-05-02 23:34:44,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:34:44,917 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1891 v_main_~n~0_65) InVars {main_~i~0=v_main_~i~0_1891, main_~n~0=v_main_~n~0_65} OutVars{main_~i~0=v_main_~i~0_1891, main_~n~0=v_main_~n~0_65} AuxVars[] AssignedVars[] [2021-05-02 23:34:44,918 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:34:44,931 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:34:44,937 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:34:44,947 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:34:44,965 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:34:44,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:45,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:34:45,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:45,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:34:45,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:45,110 INFO 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 23:34:48,971 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:34:48,972 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [333908142] [2021-05-02 23:34:48,972 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [333908142] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:34:48,972 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:34:48,972 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [69] imperfect sequences [] total 69 [2021-05-02 23:34:48,972 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616061572] [2021-05-02 23:34:48,972 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2021-05-02 23:34:48,972 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:34:48,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-05-02 23:34:48,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=261, Invalid=4709, Unknown=0, NotChecked=0, Total=4970 [2021-05-02 23:34:48,973 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 23:34:58,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:34:58,560 INFO L93 Difference]: Finished difference Result 98 states and 101 transitions. [2021-05-02 23:34:58,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-02 23:34:58,560 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 23:34:58,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:34:58,561 INFO L225 Difference]: With dead ends: 98 [2021-05-02 23:34:58,561 INFO L226 Difference]: Without dead ends: 84 [2021-05-02 23:34:58,562 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2945 ImplicationChecksByTransitivity, 9273.7ms TimeCoverageRelationStatistics Valid=738, Invalid=18444, Unknown=0, NotChecked=0, Total=19182 [2021-05-02 23:34:58,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-02 23:34:58,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2021-05-02 23:34:58,570 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 23:34:58,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2021-05-02 23:34:58,570 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 79 [2021-05-02 23:34:58,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:34:58,570 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2021-05-02 23:34:58,570 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 23:34:58,570 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2021-05-02 23:34:58,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-02 23:34:58,571 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:34:58,571 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 23:34:58,571 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2021-05-02 23:34:58,571 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:34:58,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:34:58,571 INFO L82 PathProgramCache]: Analyzing trace with hash 684695596, now seen corresponding path program 59 times [2021-05-02 23:34:58,571 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:34:58,571 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2093644075] [2021-05-02 23:34:58,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:34:58,577 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1953 v_main_~n~0_66) InVars {main_~i~0=v_main_~i~0_1953, main_~n~0=v_main_~n~0_66} OutVars{main_~i~0=v_main_~i~0_1953, main_~n~0=v_main_~n~0_66} AuxVars[] AssignedVars[] [2021-05-02 23:34:58,583 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:34:58,584 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:34:58,591 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:34:58,617 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:34:58,637 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:34:58,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:58,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:34:58,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:58,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:34:58,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:58,733 INFO 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 23:35:01,751 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:35:01,751 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2093644075] [2021-05-02 23:35:01,751 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2093644075] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:35:01,751 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:35:01,751 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [70] imperfect sequences [] total 70 [2021-05-02 23:35:01,751 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609283987] [2021-05-02 23:35:01,752 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2021-05-02 23:35:01,752 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:35:01,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-05-02 23:35:01,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=4847, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 23:35:01,753 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 23:35:10,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:35:10,104 INFO L93 Difference]: Finished difference Result 99 states and 102 transitions. [2021-05-02 23:35:10,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-05-02 23:35:10,105 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 23:35:10,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:35:10,105 INFO L225 Difference]: With dead ends: 99 [2021-05-02 23:35:10,105 INFO L226 Difference]: Without dead ends: 85 [2021-05-02 23:35:10,106 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3024 ImplicationChecksByTransitivity, 7821.9ms TimeCoverageRelationStatistics Valid=749, Invalid=18991, Unknown=0, NotChecked=0, Total=19740 [2021-05-02 23:35:10,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-02 23:35:10,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 84. [2021-05-02 23:35:10,112 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 23:35:10,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 85 transitions. [2021-05-02 23:35:10,112 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 85 transitions. Word has length 80 [2021-05-02 23:35:10,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:35:10,112 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 85 transitions. [2021-05-02 23:35:10,112 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 23:35:10,112 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 85 transitions. [2021-05-02 23:35:10,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-02 23:35:10,113 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:35:10,113 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 23:35:10,113 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2021-05-02 23:35:10,113 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:35:10,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:35:10,113 INFO L82 PathProgramCache]: Analyzing trace with hash -865175802, now seen corresponding path program 60 times [2021-05-02 23:35:10,113 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:35:10,113 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1811669749] [2021-05-02 23:35:10,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:35:10,136 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2016 v_main_~n~0_67) InVars {main_~i~0=v_main_~i~0_2016, main_~n~0=v_main_~n~0_67} OutVars{main_~i~0=v_main_~i~0_2016, main_~n~0=v_main_~n~0_67} AuxVars[] AssignedVars[] [2021-05-02 23:35:10,137 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:35:10,150 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:35:10,156 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:35:10,171 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:35:10,193 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:35:10,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:10,286 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:35:10,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:10,289 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:35:10,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:10,291 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:35:15,953 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:35:15,954 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1811669749] [2021-05-02 23:35:15,954 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1811669749] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:35:15,954 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:35:15,954 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [71] imperfect sequences [] total 71 [2021-05-02 23:35:15,954 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [237264724] [2021-05-02 23:35:15,954 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2021-05-02 23:35:15,955 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:35:15,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-05-02 23:35:15,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=5047, Unknown=0, NotChecked=0, Total=5256 [2021-05-02 23:35:15,956 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 23:35:27,575 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 36 [2021-05-02 23:35:28,199 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 38 [2021-05-02 23:35:29,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:35:29,062 INFO L93 Difference]: Finished difference Result 100 states and 103 transitions. [2021-05-02 23:35:29,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-05-02 23:35:29,065 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 23:35:29,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:35:29,066 INFO L225 Difference]: With dead ends: 100 [2021-05-02 23:35:29,066 INFO L226 Difference]: Without dead ends: 86 [2021-05-02 23:35:29,067 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3238 ImplicationChecksByTransitivity, 12833.6ms TimeCoverageRelationStatistics Valid=639, Invalid=19667, Unknown=0, NotChecked=0, Total=20306 [2021-05-02 23:35:29,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-02 23:35:29,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2021-05-02 23:35:29,073 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 23:35:29,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 86 transitions. [2021-05-02 23:35:29,073 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 86 transitions. Word has length 81 [2021-05-02 23:35:29,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:35:29,073 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 86 transitions. [2021-05-02 23:35:29,073 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 23:35:29,074 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 86 transitions. [2021-05-02 23:35:29,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-02 23:35:29,074 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:35:29,074 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 23:35:29,074 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2021-05-02 23:35:29,074 INFO L428 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:35:29,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:35:29,074 INFO L82 PathProgramCache]: Analyzing trace with hash -1666548884, now seen corresponding path program 61 times [2021-05-02 23:35:29,075 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:35:29,075 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1559374492] [2021-05-02 23:35:29,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:35:29,082 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2080 v_main_~n~0_68) InVars {main_~i~0=v_main_~i~0_2080, main_~n~0=v_main_~n~0_68} OutVars{main_~i~0=v_main_~i~0_2080, main_~n~0=v_main_~n~0_68} AuxVars[] AssignedVars[] [2021-05-02 23:35:29,084 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:35:29,085 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:35:29,096 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:35:29,145 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:35:29,192 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:35:29,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:29,419 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:35:29,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:29,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:35:29,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:29,430 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 23:35:34,833 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:35:34,834 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1559374492] [2021-05-02 23:35:34,834 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1559374492] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:35:34,834 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:35:34,834 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [72] imperfect sequences [] total 72 [2021-05-02 23:35:34,834 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691296277] [2021-05-02 23:35:34,834 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2021-05-02 23:35:34,834 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:35:34,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-05-02 23:35:34,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=273, Invalid=5129, Unknown=0, NotChecked=0, Total=5402 [2021-05-02 23:35:34,835 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 23:35:43,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:35:43,791 INFO L93 Difference]: Finished difference Result 101 states and 104 transitions. [2021-05-02 23:35:43,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-05-02 23:35:43,792 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 23:35:43,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:35:43,793 INFO L225 Difference]: With dead ends: 101 [2021-05-02 23:35:43,793 INFO L226 Difference]: Without dead ends: 87 [2021-05-02 23:35:43,795 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3185 ImplicationChecksByTransitivity, 10408.9ms TimeCoverageRelationStatistics Valid=771, Invalid=20109, Unknown=0, NotChecked=0, Total=20880 [2021-05-02 23:35:43,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-02 23:35:43,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2021-05-02 23:35:43,801 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 23:35:43,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 87 transitions. [2021-05-02 23:35:43,802 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 87 transitions. Word has length 82 [2021-05-02 23:35:43,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:35:43,802 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 87 transitions. [2021-05-02 23:35:43,802 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 23:35:43,802 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 87 transitions. [2021-05-02 23:35:43,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 23:35:43,803 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:35:43,803 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 23:35:43,803 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2021-05-02 23:35:43,803 INFO L428 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:35:43,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:35:43,803 INFO L82 PathProgramCache]: Analyzing trace with hash -739310650, now seen corresponding path program 62 times [2021-05-02 23:35:43,803 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:35:43,803 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [104461902] [2021-05-02 23:35:43,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:35:43,823 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2145 v_main_~n~0_69) InVars {main_~i~0=v_main_~i~0_2145, main_~n~0=v_main_~n~0_69} OutVars{main_~i~0=v_main_~i~0_2145, main_~n~0=v_main_~n~0_69} AuxVars[] AssignedVars[] [2021-05-02 23:35:43,824 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:35:43,838 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:35:43,846 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:35:43,871 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:35:43,891 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:35:43,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:44,105 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:35:44,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:44,111 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:35:44,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:44,115 INFO 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 23:35:47,960 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:35:47,961 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [104461902] [2021-05-02 23:35:47,961 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [104461902] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:35:47,961 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:35:47,961 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [73] imperfect sequences [] total 73 [2021-05-02 23:35:47,961 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360343797] [2021-05-02 23:35:47,961 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2021-05-02 23:35:47,961 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:35:47,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-05-02 23:35:47,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=5273, Unknown=0, NotChecked=0, Total=5550 [2021-05-02 23:35:47,962 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 23:35:57,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:35:57,792 INFO L93 Difference]: Finished difference Result 102 states and 105 transitions. [2021-05-02 23:35:57,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-05-02 23:35:57,793 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 23:35:57,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:35:57,793 INFO L225 Difference]: With dead ends: 102 [2021-05-02 23:35:57,793 INFO L226 Difference]: Without dead ends: 88 [2021-05-02 23:35:57,795 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3267 ImplicationChecksByTransitivity, 9404.8ms TimeCoverageRelationStatistics Valid=782, Invalid=20680, Unknown=0, NotChecked=0, Total=21462 [2021-05-02 23:35:57,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-05-02 23:35:57,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2021-05-02 23:35:57,800 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 23:35:57,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2021-05-02 23:35:57,801 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 83 [2021-05-02 23:35:57,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:35:57,801 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2021-05-02 23:35:57,801 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 23:35:57,801 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2021-05-02 23:35:57,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-05-02 23:35:57,802 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:35:57,802 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 23:35:57,802 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63 [2021-05-02 23:35:57,802 INFO L428 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:35:57,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:35:57,802 INFO L82 PathProgramCache]: Analyzing trace with hash -2059696468, now seen corresponding path program 63 times [2021-05-02 23:35:57,802 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:35:57,802 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2087776192] [2021-05-02 23:35:57,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:35:57,827 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2211 v_main_~n~0_70) InVars {main_~i~0=v_main_~i~0_2211, main_~n~0=v_main_~n~0_70} OutVars{main_~i~0=v_main_~i~0_2211, main_~n~0=v_main_~n~0_70} AuxVars[] AssignedVars[] [2021-05-02 23:35:57,831 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:35:57,846 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:35:57,852 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:35:57,866 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:35:57,888 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:35:57,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:57,989 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:35:57,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:58,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:35:58,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:58,020 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:36:03,390 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:36:03,391 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2087776192] [2021-05-02 23:36:03,391 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2087776192] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:36:03,391 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:36:03,391 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [74] imperfect sequences [] total 74 [2021-05-02 23:36:03,391 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [741724214] [2021-05-02 23:36:03,392 INFO L460 AbstractCegarLoop]: Interpolant automaton has 74 states [2021-05-02 23:36:03,392 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:36:03,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-05-02 23:36:03,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=5419, Unknown=0, NotChecked=0, Total=5700 [2021-05-02 23:36:03,394 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 23:36:11,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:36:11,881 INFO L93 Difference]: Finished difference Result 103 states and 106 transitions. [2021-05-02 23:36:11,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-05-02 23:36:11,882 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 23:36:11,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:36:11,883 INFO L225 Difference]: With dead ends: 103 [2021-05-02 23:36:11,883 INFO L226 Difference]: Without dead ends: 89 [2021-05-02 23:36:11,885 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3350 ImplicationChecksByTransitivity, 10200.4ms TimeCoverageRelationStatistics Valid=793, Invalid=21259, Unknown=0, NotChecked=0, Total=22052 [2021-05-02 23:36:11,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-02 23:36:11,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2021-05-02 23:36:11,891 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 23:36:11,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2021-05-02 23:36:11,891 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 84 [2021-05-02 23:36:11,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:36:11,891 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2021-05-02 23:36:11,892 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 23:36:11,892 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2021-05-02 23:36:11,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-02 23:36:11,892 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:36:11,892 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 23:36:11,892 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64 [2021-05-02 23:36:11,892 INFO L428 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:36:11,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:36:11,893 INFO L82 PathProgramCache]: Analyzing trace with hash -41983866, now seen corresponding path program 64 times [2021-05-02 23:36:11,893 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:36:11,893 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1594355928] [2021-05-02 23:36:11,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:36:11,901 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2278 v_main_~n~0_71) InVars {main_~i~0=v_main_~i~0_2278, main_~n~0=v_main_~n~0_71} OutVars{main_~i~0=v_main_~i~0_2278, main_~n~0=v_main_~n~0_71} AuxVars[] AssignedVars[] [2021-05-02 23:36:11,903 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:36:11,909 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:36:11,919 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:36:11,962 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:36:11,984 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:36:12,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:12,112 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:36:12,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:12,116 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:36:12,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:12,119 INFO 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 23:36:16,320 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:36:16,321 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1594355928] [2021-05-02 23:36:16,321 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1594355928] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:36:16,321 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:36:16,321 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [75] imperfect sequences [] total 75 [2021-05-02 23:36:16,321 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845189252] [2021-05-02 23:36:16,321 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2021-05-02 23:36:16,321 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:36:16,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-05-02 23:36:16,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=285, Invalid=5567, Unknown=0, NotChecked=0, Total=5852 [2021-05-02 23:36:16,322 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 23:36:26,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:36:26,573 INFO L93 Difference]: Finished difference Result 104 states and 107 transitions. [2021-05-02 23:36:26,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-05-02 23:36:26,574 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 23:36:26,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:36:26,575 INFO L225 Difference]: With dead ends: 104 [2021-05-02 23:36:26,575 INFO L226 Difference]: Without dead ends: 90 [2021-05-02 23:36:26,576 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3434 ImplicationChecksByTransitivity, 9849.7ms TimeCoverageRelationStatistics Valid=804, Invalid=21846, Unknown=0, NotChecked=0, Total=22650 [2021-05-02 23:36:26,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-02 23:36:26,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2021-05-02 23:36:26,582 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 23:36:26,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 90 transitions. [2021-05-02 23:36:26,582 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 90 transitions. Word has length 85 [2021-05-02 23:36:26,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:36:26,582 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 90 transitions. [2021-05-02 23:36:26,582 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 23:36:26,583 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 90 transitions. [2021-05-02 23:36:26,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-02 23:36:26,583 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:36:26,583 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 23:36:26,583 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2021-05-02 23:36:26,583 INFO L428 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:36:26,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:36:26,583 INFO L82 PathProgramCache]: Analyzing trace with hash -1917402644, now seen corresponding path program 65 times [2021-05-02 23:36:26,583 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:36:26,583 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [921654167] [2021-05-02 23:36:26,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:36:26,588 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2346 v_main_~n~0_72) InVars {main_~i~0=v_main_~i~0_2346, main_~n~0=v_main_~n~0_72} OutVars{main_~i~0=v_main_~i~0_2346, main_~n~0=v_main_~n~0_72} AuxVars[] AssignedVars[] [2021-05-02 23:36:26,589 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:36:26,590 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:36:26,597 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:36:26,623 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:36:26,645 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:36:26,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:26,772 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:36:26,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:26,776 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:36:26,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:26,778 INFO 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 23:36:30,969 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:36:30,969 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [921654167] [2021-05-02 23:36:30,969 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [921654167] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:36:30,969 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:36:30,969 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [76] imperfect sequences [] total 76 [2021-05-02 23:36:30,969 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1203028341] [2021-05-02 23:36:30,970 INFO L460 AbstractCegarLoop]: Interpolant automaton has 76 states [2021-05-02 23:36:30,970 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:36:30,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-05-02 23:36:30,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=289, Invalid=5717, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 23:36:30,970 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 23:36:41,178 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 30 [2021-05-02 23:36:42,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:36:42,277 INFO L93 Difference]: Finished difference Result 105 states and 108 transitions. [2021-05-02 23:36:42,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-05-02 23:36:42,282 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 23:36:42,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:36:42,283 INFO L225 Difference]: With dead ends: 105 [2021-05-02 23:36:42,283 INFO L226 Difference]: Without dead ends: 91 [2021-05-02 23:36:42,285 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3519 ImplicationChecksByTransitivity, 9979.7ms TimeCoverageRelationStatistics Valid=815, Invalid=22441, Unknown=0, NotChecked=0, Total=23256 [2021-05-02 23:36:42,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-05-02 23:36:42,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2021-05-02 23:36:42,292 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 23:36:42,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 91 transitions. [2021-05-02 23:36:42,292 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 91 transitions. Word has length 86 [2021-05-02 23:36:42,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:36:42,292 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 91 transitions. [2021-05-02 23:36:42,292 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 23:36:42,293 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 91 transitions. [2021-05-02 23:36:42,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-05-02 23:36:42,293 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:36:42,293 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 23:36:42,293 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66 [2021-05-02 23:36:42,293 INFO L428 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:36:42,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:36:42,294 INFO L82 PathProgramCache]: Analyzing trace with hash 74157382, now seen corresponding path program 66 times [2021-05-02 23:36:42,294 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:36:42,294 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [804874103] [2021-05-02 23:36:42,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:36:42,303 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2415 v_main_~n~0_73) InVars {main_~i~0=v_main_~i~0_2415, main_~n~0=v_main_~n~0_73} OutVars{main_~i~0=v_main_~i~0_2415, main_~n~0=v_main_~n~0_73} AuxVars[] AssignedVars[] [2021-05-02 23:36:42,306 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:36:42,308 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:36:42,326 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:36:42,418 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:36:42,507 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:36:42,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:42,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:36:42,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:42,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:36:42,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:42,866 INFO 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 23:36:42,993 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 15 [2021-05-02 23:36:52,872 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:36:52,872 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [804874103] [2021-05-02 23:36:52,872 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [804874103] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:36:52,873 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:36:52,873 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [77] imperfect sequences [] total 77 [2021-05-02 23:36:52,873 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124321483] [2021-05-02 23:36:52,873 INFO L460 AbstractCegarLoop]: Interpolant automaton has 77 states [2021-05-02 23:36:52,873 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:36:52,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-05-02 23:36:52,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=5869, Unknown=0, NotChecked=0, Total=6162 [2021-05-02 23:36:52,874 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 23:37:05,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:37:05,009 INFO L93 Difference]: Finished difference Result 106 states and 109 transitions. [2021-05-02 23:37:05,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-05-02 23:37:05,011 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 23:37:05,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:37:05,012 INFO L225 Difference]: With dead ends: 106 [2021-05-02 23:37:05,012 INFO L226 Difference]: Without dead ends: 92 [2021-05-02 23:37:05,013 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3605 ImplicationChecksByTransitivity, 16456.8ms TimeCoverageRelationStatistics Valid=826, Invalid=23044, Unknown=0, NotChecked=0, Total=23870 [2021-05-02 23:37:05,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-02 23:37:05,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2021-05-02 23:37:05,019 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 23:37:05,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2021-05-02 23:37:05,020 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 87 [2021-05-02 23:37:05,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:37:05,020 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2021-05-02 23:37:05,020 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 23:37:05,020 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2021-05-02 23:37:05,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-02 23:37:05,020 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:37:05,021 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 23:37:05,021 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67 [2021-05-02 23:37:05,021 INFO L428 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:37:05,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:37:05,021 INFO L82 PathProgramCache]: Analyzing trace with hash 1682976044, now seen corresponding path program 67 times [2021-05-02 23:37:05,021 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:37:05,021 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [536916465] [2021-05-02 23:37:05,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:37:05,026 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2485 v_main_~n~0_74) InVars {main_~i~0=v_main_~i~0_2485, main_~n~0=v_main_~n~0_74} OutVars{main_~i~0=v_main_~i~0_2485, main_~n~0=v_main_~n~0_74} AuxVars[] AssignedVars[] [2021-05-02 23:37:05,028 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:37:05,029 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:37:05,039 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:37:05,074 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:37:05,098 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:37:05,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:37:05,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:37:05,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:37:05,218 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:37:05,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:37:05,221 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:37:10,039 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:37:10,039 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [536916465] [2021-05-02 23:37:10,039 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [536916465] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:37:10,039 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:37:10,039 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [78] imperfect sequences [] total 78 [2021-05-02 23:37:10,039 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444128648] [2021-05-02 23:37:10,040 INFO L460 AbstractCegarLoop]: Interpolant automaton has 78 states [2021-05-02 23:37:10,040 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:37:10,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-05-02 23:37:10,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=297, Invalid=6023, Unknown=0, NotChecked=0, Total=6320 [2021-05-02 23:37:10,040 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 23:37:20,505 WARN L205 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 30 [2021-05-02 23:37:21,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:37:21,350 INFO L93 Difference]: Finished difference Result 107 states and 110 transitions. [2021-05-02 23:37:21,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-05-02 23:37:21,353 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 23:37:21,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:37:21,354 INFO L225 Difference]: With dead ends: 107 [2021-05-02 23:37:21,354 INFO L226 Difference]: Without dead ends: 93 [2021-05-02 23:37:21,355 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3692 ImplicationChecksByTransitivity, 10888.2ms TimeCoverageRelationStatistics Valid=837, Invalid=23655, Unknown=0, NotChecked=0, Total=24492 [2021-05-02 23:37:21,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-02 23:37:21,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2021-05-02 23:37:21,360 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 23:37:21,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 93 transitions. [2021-05-02 23:37:21,361 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 93 transitions. Word has length 88 [2021-05-02 23:37:21,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:37:21,361 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 93 transitions. [2021-05-02 23:37:21,361 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 23:37:21,361 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 93 transitions. [2021-05-02 23:37:21,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 23:37:21,361 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:37:21,361 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 23:37:21,362 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68 [2021-05-02 23:37:21,362 INFO L428 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:37:21,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:37:21,362 INFO L82 PathProgramCache]: Analyzing trace with hash 16747014, now seen corresponding path program 68 times [2021-05-02 23:37:21,362 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:37:21,362 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [162697724] [2021-05-02 23:37:21,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:37:21,372 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2556 v_main_~n~0_75) InVars {main_~i~0=v_main_~i~0_2556, main_~n~0=v_main_~n~0_75} OutVars{main_~i~0=v_main_~i~0_2556, main_~n~0=v_main_~n~0_75} AuxVars[] AssignedVars[] [2021-05-02 23:37:21,374 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:37:21,402 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:37:21,413 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:37:21,438 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:37:21,496 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:37:21,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:37:21,747 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:37:21,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:37:21,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:37:21,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:37:21,756 INFO 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 23:37:32,594 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:37:32,595 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [162697724] [2021-05-02 23:37:32,595 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [162697724] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:37:32,595 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:37:32,595 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [79] imperfect sequences [] total 79 [2021-05-02 23:37:32,595 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196398759] [2021-05-02 23:37:32,595 INFO L460 AbstractCegarLoop]: Interpolant automaton has 79 states [2021-05-02 23:37:32,595 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:37:32,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-05-02 23:37:32,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=6179, Unknown=0, NotChecked=0, Total=6480 [2021-05-02 23:37:32,596 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 23:37:32,863 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-02 23:37:45,795 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 36 [2021-05-02 23:37:46,700 WARN L205 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 38 [2021-05-02 23:37:47,568 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 30 [2021-05-02 23:37:48,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:37:48,380 INFO L93 Difference]: Finished difference Result 108 states and 111 transitions. [2021-05-02 23:37:48,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-05-02 23:37:48,386 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 23:37:48,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:37:48,387 INFO L225 Difference]: With dead ends: 108 [2021-05-02 23:37:48,387 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 23:37:48,389 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3780 ImplicationChecksByTransitivity, 18920.4ms TimeCoverageRelationStatistics Valid=848, Invalid=24274, Unknown=0, NotChecked=0, Total=25122 [2021-05-02 23:37:48,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 23:37:48,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2021-05-02 23:37:48,399 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 23:37:48,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 94 transitions. [2021-05-02 23:37:48,399 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 94 transitions. Word has length 89 [2021-05-02 23:37:48,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:37:48,400 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 94 transitions. [2021-05-02 23:37:48,400 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 23:37:48,400 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 94 transitions. [2021-05-02 23:37:48,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-05-02 23:37:48,400 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:37:48,401 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 23:37:48,401 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69 [2021-05-02 23:37:48,401 INFO L428 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:37:48,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:37:48,402 INFO L82 PathProgramCache]: Analyzing trace with hash -96745364, now seen corresponding path program 69 times [2021-05-02 23:37:48,402 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:37:48,402 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1056425354] [2021-05-02 23:37:48,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:37:48,439 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2628 v_main_~n~0_76) InVars {main_~i~0=v_main_~i~0_2628, main_~n~0=v_main_~n~0_76} OutVars{main_~i~0=v_main_~i~0_2628, main_~n~0=v_main_~n~0_76} AuxVars[] AssignedVars[] [2021-05-02 23:37:48,443 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:37:48,445 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:37:48,464 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:37:48,541 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:37:48,617 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:37:48,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:37:49,039 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:37:49,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:37:49,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:37:49,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:37:49,054 INFO 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 23:37:49,249 WARN L205 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 15 [2021-05-02 23:38:02,867 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:38:02,867 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1056425354] [2021-05-02 23:38:02,867 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1056425354] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:38:02,868 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:38:02,868 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [80] imperfect sequences [] total 80 [2021-05-02 23:38:02,868 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [641622955] [2021-05-02 23:38:02,868 INFO L460 AbstractCegarLoop]: Interpolant automaton has 80 states [2021-05-02 23:38:02,868 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:38:02,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-05-02 23:38:02,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=6337, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 23:38:02,869 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 23:38:14,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:38:14,977 INFO L93 Difference]: Finished difference Result 109 states and 112 transitions. [2021-05-02 23:38:14,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-05-02 23:38:14,979 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 23:38:14,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:38:14,980 INFO L225 Difference]: With dead ends: 109 [2021-05-02 23:38:14,980 INFO L226 Difference]: Without dead ends: 95 [2021-05-02 23:38:14,982 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3869 ImplicationChecksByTransitivity, 20271.5ms TimeCoverageRelationStatistics Valid=859, Invalid=24901, Unknown=0, NotChecked=0, Total=25760 [2021-05-02 23:38:14,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-02 23:38:14,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2021-05-02 23:38:14,990 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 23:38:14,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2021-05-02 23:38:14,991 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 90 [2021-05-02 23:38:14,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:38:14,991 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2021-05-02 23:38:14,991 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 23:38:14,991 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2021-05-02 23:38:14,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-02 23:38:14,991 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:38:14,992 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 23:38:14,992 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70 [2021-05-02 23:38:14,992 INFO L428 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:38:14,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:38:14,992 INFO L82 PathProgramCache]: Analyzing trace with hash 679958214, now seen corresponding path program 70 times [2021-05-02 23:38:14,992 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:38:15,004 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1916375701] [2021-05-02 23:38:15,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:38:15,014 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2701 v_main_~n~0_77) InVars {main_~i~0=v_main_~i~0_2701, main_~n~0=v_main_~n~0_77} OutVars{main_~i~0=v_main_~i~0_2701, main_~n~0=v_main_~n~0_77} AuxVars[] AssignedVars[] [2021-05-02 23:38:15,016 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:38:15,018 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:38:15,029 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:38:15,060 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:38:15,085 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:38:15,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:38:15,231 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:38:15,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:38:15,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:38:15,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:38:15,239 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 23:38:20,871 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:38:20,872 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1916375701] [2021-05-02 23:38:20,872 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1916375701] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:38:20,872 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:38:20,872 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [81] imperfect sequences [] total 81 [2021-05-02 23:38:20,872 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964080847] [2021-05-02 23:38:20,872 INFO L460 AbstractCegarLoop]: Interpolant automaton has 81 states [2021-05-02 23:38:20,872 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:38:20,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2021-05-02 23:38:20,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=6497, Unknown=0, NotChecked=0, Total=6806 [2021-05-02 23:38:20,875 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 23:38:43,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:38:43,100 INFO L93 Difference]: Finished difference Result 110 states and 113 transitions. [2021-05-02 23:38:43,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-05-02 23:38:43,101 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 23:38:43,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:38:43,102 INFO L225 Difference]: With dead ends: 110 [2021-05-02 23:38:43,102 INFO L226 Difference]: Without dead ends: 96 [2021-05-02 23:38:43,104 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3959 ImplicationChecksByTransitivity, 16668.6ms TimeCoverageRelationStatistics Valid=870, Invalid=25536, Unknown=0, NotChecked=0, Total=26406 [2021-05-02 23:38:43,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-02 23:38:43,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2021-05-02 23:38:43,110 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 23:38:43,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 96 transitions. [2021-05-02 23:38:43,110 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 96 transitions. Word has length 91 [2021-05-02 23:38:43,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:38:43,110 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 96 transitions. [2021-05-02 23:38:43,110 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 23:38:43,110 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 96 transitions. [2021-05-02 23:38:43,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-05-02 23:38:43,111 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:38:43,111 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 23:38:43,111 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71 [2021-05-02 23:38:43,111 INFO L428 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:38:43,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:38:43,111 INFO L82 PathProgramCache]: Analyzing trace with hash -1012034644, now seen corresponding path program 71 times [2021-05-02 23:38:43,111 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:38:43,112 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [688694661] [2021-05-02 23:38:43,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:38:43,118 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2775 v_main_~n~0_78) InVars {main_~i~0=v_main_~i~0_2775, main_~n~0=v_main_~n~0_78} OutVars{main_~i~0=v_main_~i~0_2775, main_~n~0=v_main_~n~0_78} AuxVars[] AssignedVars[] [2021-05-02 23:38:43,137 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:38:43,183 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:38:43,197 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:38:43,239 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:38:43,324 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:38:43,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:38:43,725 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:38:43,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:38:43,751 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:38:43,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:38:43,755 INFO 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 23:38:50,627 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:38:50,628 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [688694661] [2021-05-02 23:38:50,628 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [688694661] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:38:50,628 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:38:50,628 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [82] imperfect sequences [] total 82 [2021-05-02 23:38:50,628 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2040943721] [2021-05-02 23:38:50,628 INFO L460 AbstractCegarLoop]: Interpolant automaton has 82 states [2021-05-02 23:38:50,629 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:38:50,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-05-02 23:38:50,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=313, Invalid=6659, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 23:38:50,629 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 23:39:04,055 WARN L205 SmtUtils]: Spent 289.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 36 [2021-05-02 23:39:05,701 WARN L205 SmtUtils]: Spent 295.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 38 [2021-05-02 23:39:06,736 WARN L205 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 30 [2021-05-02 23:39:07,403 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2021-05-02 23:39:08,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:39:08,092 INFO L93 Difference]: Finished difference Result 111 states and 114 transitions. [2021-05-02 23:39:08,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2021-05-02 23:39:08,103 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 23:39:08,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:39:08,103 INFO L225 Difference]: With dead ends: 111 [2021-05-02 23:39:08,104 INFO L226 Difference]: Without dead ends: 97 [2021-05-02 23:39:08,105 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4050 ImplicationChecksByTransitivity, 16180.8ms TimeCoverageRelationStatistics Valid=881, Invalid=26179, Unknown=0, NotChecked=0, Total=27060 [2021-05-02 23:39:08,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-05-02 23:39:08,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 96. [2021-05-02 23:39:08,115 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 23:39:08,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 97 transitions. [2021-05-02 23:39:08,115 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 97 transitions. Word has length 92 [2021-05-02 23:39:08,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:39:08,115 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 97 transitions. [2021-05-02 23:39:08,115 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 23:39:08,115 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 97 transitions. [2021-05-02 23:39:08,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-02 23:39:08,116 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:39:08,116 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 23:39:08,116 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72 [2021-05-02 23:39:08,116 INFO L428 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:39:08,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:39:08,117 INFO L82 PathProgramCache]: Analyzing trace with hash -1924205690, now seen corresponding path program 72 times [2021-05-02 23:39:08,117 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:39:08,117 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1114445126] [2021-05-02 23:39:08,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:39:08,134 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2850 v_main_~n~0_79) InVars {main_~i~0=v_main_~i~0_2850, main_~n~0=v_main_~n~0_79} OutVars{main_~i~0=v_main_~i~0_2850, main_~n~0=v_main_~n~0_79} AuxVars[] AssignedVars[] [2021-05-02 23:39:08,139 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:39:08,142 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:39:08,173 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:39:08,310 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:39:08,441 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2021-05-02 23:39:08,449 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:39:08,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:39:08,960 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:39:08,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:39:08,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:39:08,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:39:08,976 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:39:09,156 WARN L205 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 15 [2021-05-02 23:39:17,845 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:39:17,845 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1114445126] [2021-05-02 23:39:17,846 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1114445126] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:39:17,846 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:39:17,846 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [83] imperfect sequences [] total 83 [2021-05-02 23:39:17,846 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228508871] [2021-05-02 23:39:17,846 INFO L460 AbstractCegarLoop]: Interpolant automaton has 83 states [2021-05-02 23:39:17,846 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:39:17,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-05-02 23:39:17,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=317, Invalid=6823, Unknown=0, NotChecked=0, Total=7140 [2021-05-02 23:39:17,847 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 23:39:33,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:39:33,029 INFO L93 Difference]: Finished difference Result 112 states and 115 transitions. [2021-05-02 23:39:33,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-05-02 23:39:33,031 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 23:39:33,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:39:33,031 INFO L225 Difference]: With dead ends: 112 [2021-05-02 23:39:33,032 INFO L226 Difference]: Without dead ends: 98 [2021-05-02 23:39:33,033 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4142 ImplicationChecksByTransitivity, 17077.6ms TimeCoverageRelationStatistics Valid=892, Invalid=26830, Unknown=0, NotChecked=0, Total=27722 [2021-05-02 23:39:33,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-02 23:39:33,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2021-05-02 23:39:33,040 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 23:39:33,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2021-05-02 23:39:33,040 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 93 [2021-05-02 23:39:33,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:39:33,040 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2021-05-02 23:39:33,041 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 23:39:33,041 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2021-05-02 23:39:33,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-02 23:39:33,041 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:39:33,041 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 23:39:33,041 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73 [2021-05-02 23:39:33,041 INFO L428 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:39:33,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:39:33,041 INFO L82 PathProgramCache]: Analyzing trace with hash -136737044, now seen corresponding path program 73 times [2021-05-02 23:39:33,042 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:39:33,042 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1268493118] [2021-05-02 23:39:33,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:39:33,051 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2926 v_main_~n~0_80) InVars {main_~i~0=v_main_~i~0_2926, main_~n~0=v_main_~n~0_80} OutVars{main_~i~0=v_main_~i~0_2926, main_~n~0=v_main_~n~0_80} AuxVars[] AssignedVars[] [2021-05-02 23:39:33,059 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:39:33,081 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:39:33,090 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:39:33,107 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:39:33,134 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:39:33,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:39:33,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:39:33,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:39:33,398 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:39:33,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:39:33,401 INFO 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 23:39:40,731 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:39:40,731 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1268493118] [2021-05-02 23:39:40,731 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1268493118] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:39:40,731 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:39:40,732 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [84] imperfect sequences [] total 84 [2021-05-02 23:39:40,732 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1746099410] [2021-05-02 23:39:40,732 INFO L460 AbstractCegarLoop]: Interpolant automaton has 84 states [2021-05-02 23:39:40,732 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:39:40,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-05-02 23:39:40,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=6989, Unknown=0, NotChecked=0, Total=7310 [2021-05-02 23:39:40,733 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 23:39:58,462 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 36 [2021-05-02 23:39:59,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:39:59,849 INFO L93 Difference]: Finished difference Result 113 states and 116 transitions. [2021-05-02 23:39:59,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-05-02 23:39:59,853 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 23:39:59,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:39:59,854 INFO L225 Difference]: With dead ends: 113 [2021-05-02 23:39:59,854 INFO L226 Difference]: Without dead ends: 99 [2021-05-02 23:39:59,855 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4235 ImplicationChecksByTransitivity, 17185.4ms TimeCoverageRelationStatistics Valid=903, Invalid=27489, Unknown=0, NotChecked=0, Total=28392 [2021-05-02 23:39:59,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-05-02 23:39:59,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2021-05-02 23:39:59,862 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 23:39:59,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 99 transitions. [2021-05-02 23:39:59,863 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 99 transitions. Word has length 94 [2021-05-02 23:39:59,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:39:59,863 INFO L480 AbstractCegarLoop]: Abstraction has 98 states and 99 transitions. [2021-05-02 23:39:59,863 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 23:39:59,863 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 99 transitions. [2021-05-02 23:39:59,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-02 23:39:59,864 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:39:59,864 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 23:39:59,864 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74 [2021-05-02 23:39:59,864 INFO L428 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:39:59,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:39:59,864 INFO L82 PathProgramCache]: Analyzing trace with hash -559783866, now seen corresponding path program 74 times [2021-05-02 23:39:59,865 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:39:59,865 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [256868491] [2021-05-02 23:39:59,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:39:59,873 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_3003 v_main_~n~0_81) InVars {main_~i~0=v_main_~i~0_3003, main_~n~0=v_main_~n~0_81} OutVars{main_~i~0=v_main_~i~0_3003, main_~n~0=v_main_~n~0_81} AuxVars[] AssignedVars[] [2021-05-02 23:39:59,875 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:39:59,876 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:39:59,889 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:39:59,957 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:39:59,993 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:39:59,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:40:00,317 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:40:00,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:40:00,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:40:00,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:40:00,326 INFO 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 23:40:10,824 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:40:10,825 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [256868491] [2021-05-02 23:40:10,825 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [256868491] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:40:10,825 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:40:10,825 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [85] imperfect sequences [] total 85 [2021-05-02 23:40:10,825 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [831381765] [2021-05-02 23:40:10,826 INFO L460 AbstractCegarLoop]: Interpolant automaton has 85 states [2021-05-02 23:40:10,826 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:40:10,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-05-02 23:40:10,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=7157, Unknown=0, NotChecked=0, Total=7482 [2021-05-02 23:40:10,827 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 23:40:30,127 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2021-05-02 23:40:32,376 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2021-05-02 23:40:39,877 WARN L205 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 36 [2021-05-02 23:40:41,436 WARN L205 SmtUtils]: Spent 323.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 38 [2021-05-02 23:40:43,401 WARN L205 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 30 [2021-05-02 23:40:43,962 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2021-05-02 23:40:45,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:40:45,340 INFO L93 Difference]: Finished difference Result 114 states and 117 transitions. [2021-05-02 23:40:45,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-05-02 23:40:45,350 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 23:40:45,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:40:45,352 INFO L225 Difference]: With dead ends: 114 [2021-05-02 23:40:45,352 INFO L226 Difference]: Without dead ends: 100 [2021-05-02 23:40:45,354 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4329 ImplicationChecksByTransitivity, 25956.8ms TimeCoverageRelationStatistics Valid=914, Invalid=28156, Unknown=0, NotChecked=0, Total=29070 [2021-05-02 23:40:45,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-05-02 23:40:45,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2021-05-02 23:40:45,368 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 23:40:45,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2021-05-02 23:40:45,368 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 95 [2021-05-02 23:40:45,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:40:45,369 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2021-05-02 23:40:45,369 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 23:40:45,369 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2021-05-02 23:40:45,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-05-02 23:40:45,370 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:40:45,370 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 23:40:45,370 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75 [2021-05-02 23:40:45,370 INFO L428 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:40:45,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:40:45,371 INFO L82 PathProgramCache]: Analyzing trace with hash -789333460, now seen corresponding path program 75 times [2021-05-02 23:40:45,371 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:40:45,371 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [775569202] [2021-05-02 23:40:45,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:40:45,386 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_3081 v_main_~n~0_82) InVars {main_~i~0=v_main_~i~0_3081, main_~n~0=v_main_~n~0_82} OutVars{main_~i~0=v_main_~i~0_3081, main_~n~0=v_main_~n~0_82} AuxVars[] AssignedVars[] [2021-05-02 23:40:45,390 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:40:45,458 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:40:45,489 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:40:45,556 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:40:45,678 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2021-05-02 23:40:45,686 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:40:45,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:40:46,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:40:46,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:40:46,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:40:46,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:40:46,185 INFO 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 23:40:46,382 WARN L205 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 15 [2021-05-02 23:40:46,723 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 10 [2021-05-02 23:41:01,987 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:41:01,987 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [775569202] [2021-05-02 23:41:01,987 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [775569202] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:41:01,987 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:41:01,987 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [86] imperfect sequences [] total 86 [2021-05-02 23:41:01,987 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596788886] [2021-05-02 23:41:01,988 INFO L460 AbstractCegarLoop]: Interpolant automaton has 86 states [2021-05-02 23:41:01,988 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:41:01,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-05-02 23:41:01,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=7402, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 23:41:01,989 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 23:41:02,266 WARN L205 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-02 23:41:06,119 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2021-05-02 23:41:08,923 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2021-05-02 23:41:12,438 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2021-05-02 23:41:16,070 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2021-05-02 23:41:18,596 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2021-05-02 23:41:20,121 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2021-05-02 23:41:23,152 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2021-05-02 23:41:24,044 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2021-05-02 23:41:38,800 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 37 [2021-05-02 23:41:39,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:41:39,945 INFO L93 Difference]: Finished difference Result 115 states and 118 transitions. [2021-05-02 23:41:39,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2021-05-02 23:41:39,950 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 23:41:39,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:41:39,951 INFO L225 Difference]: With dead ends: 115 [2021-05-02 23:41:39,951 INFO L226 Difference]: Without dead ends: 101 [2021-05-02 23:41:39,953 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4588 ImplicationChecksByTransitivity, 33687.4ms TimeCoverageRelationStatistics Valid=774, Invalid=28982, Unknown=0, NotChecked=0, Total=29756 [2021-05-02 23:41:39,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-05-02 23:41:39,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 100. [2021-05-02 23:41:39,961 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 23:41:39,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2021-05-02 23:41:39,963 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 96 [2021-05-02 23:41:39,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:41:39,963 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2021-05-02 23:41:39,963 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 23:41:39,963 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2021-05-02 23:41:39,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-02 23:41:39,964 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:41:39,964 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 23:41:39,964 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76 [2021-05-02 23:41:39,964 INFO L428 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:41:39,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:41:39,965 INFO L82 PathProgramCache]: Analyzing trace with hash 684563718, now seen corresponding path program 76 times [2021-05-02 23:41:39,965 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:41:39,965 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [665053637] [2021-05-02 23:41:39,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:41:39,975 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_3160 v_main_~n~0_83) InVars {main_~i~0=v_main_~i~0_3160, main_~n~0=v_main_~n~0_83} OutVars{main_~i~0=v_main_~i~0_3160, main_~n~0=v_main_~n~0_83} AuxVars[] AssignedVars[] [2021-05-02 23:41:39,978 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:41:39,980 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:41:39,999 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:41:40,087 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:41:40,173 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:41:40,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:41:40,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:41:40,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:41:40,469 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:41:40,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:41:40,471 INFO 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 23:41:51,296 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:41:51,297 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [665053637] [2021-05-02 23:41:51,297 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [665053637] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:41:51,297 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:41:51,297 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [87] imperfect sequences [] total 87 [2021-05-02 23:41:51,297 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034341004] [2021-05-02 23:41:51,297 INFO L460 AbstractCegarLoop]: Interpolant automaton has 87 states [2021-05-02 23:41:51,297 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:41:51,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-05-02 23:41:51,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=333, Invalid=7499, Unknown=0, NotChecked=0, Total=7832 [2021-05-02 23:41:51,298 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 23:41:51,717 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-02 23:42:23,789 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 36 [2021-05-02 23:42:24,731 WARN L205 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 38 [2021-05-02 23:42:26,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:42:26,379 INFO L93 Difference]: Finished difference Result 116 states and 119 transitions. [2021-05-02 23:42:26,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2021-05-02 23:42:26,383 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 23:42:26,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:42:26,384 INFO L225 Difference]: With dead ends: 116 [2021-05-02 23:42:26,384 INFO L226 Difference]: Without dead ends: 102 [2021-05-02 23:42:26,386 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4520 ImplicationChecksByTransitivity, 26738.2ms TimeCoverageRelationStatistics Valid=936, Invalid=29514, Unknown=0, NotChecked=0, Total=30450 [2021-05-02 23:42:26,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-05-02 23:42:26,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2021-05-02 23:42:26,395 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 23:42:26,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 102 transitions. [2021-05-02 23:42:26,407 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 102 transitions. Word has length 97 [2021-05-02 23:42:26,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:42:26,407 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 102 transitions. [2021-05-02 23:42:26,407 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 23:42:26,407 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 102 transitions. [2021-05-02 23:42:26,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-05-02 23:42:26,409 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:42:26,409 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 23:42:26,409 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77 [2021-05-02 23:42:26,409 INFO L428 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:42:26,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:42:26,409 INFO L82 PathProgramCache]: Analyzing trace with hash -869264020, now seen corresponding path program 77 times [2021-05-02 23:42:26,410 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:42:26,410 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1943581264] [2021-05-02 23:42:26,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:42:26,419 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_3240 v_main_~n~0_84) InVars {main_~i~0=v_main_~i~0_3240, main_~n~0=v_main_~n~0_84} OutVars{main_~i~0=v_main_~i~0_3240, main_~n~0=v_main_~n~0_84} AuxVars[] AssignedVars[] [2021-05-02 23:42:26,422 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:42:26,455 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:42:26,469 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:42:26,495 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:42:26,543 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:42:26,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:42:26,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:42:26,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:42:26,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:42:26,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:42:26,818 INFO 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 23:42:26,929 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 15 [2021-05-02 23:42:38,154 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:42:38,154 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1943581264] [2021-05-02 23:42:38,154 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1943581264] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:42:38,154 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:42:38,154 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [88] imperfect sequences [] total 88 [2021-05-02 23:42:38,154 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [429873253] [2021-05-02 23:42:38,155 INFO L460 AbstractCegarLoop]: Interpolant automaton has 88 states [2021-05-02 23:42:38,155 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:42:38,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2021-05-02 23:42:38,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=7673, Unknown=0, NotChecked=0, Total=8010 [2021-05-02 23:42:38,156 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 23:43:02,291 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 35 [2021-05-02 23:43:03,078 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 37 [2021-05-02 23:43:04,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:43:04,193 INFO L93 Difference]: Finished difference Result 117 states and 120 transitions. [2021-05-02 23:43:04,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-05-02 23:43:04,196 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 23:43:04,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:43:04,197 INFO L225 Difference]: With dead ends: 117 [2021-05-02 23:43:04,197 INFO L226 Difference]: Without dead ends: 103 [2021-05-02 23:43:04,199 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4617 ImplicationChecksByTransitivity, 23770.1ms TimeCoverageRelationStatistics Valid=947, Invalid=30205, Unknown=0, NotChecked=0, Total=31152 [2021-05-02 23:43:04,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-05-02 23:43:04,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 102. [2021-05-02 23:43:04,207 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 23:43:04,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 103 transitions. [2021-05-02 23:43:04,207 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 103 transitions. Word has length 98 [2021-05-02 23:43:04,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:43:04,207 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 103 transitions. [2021-05-02 23:43:04,208 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 23:43:04,208 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 103 transitions. [2021-05-02 23:43:04,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-02 23:43:04,208 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:43:04,208 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 23:43:04,208 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78 [2021-05-02 23:43:04,208 INFO L428 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:43:04,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:43:04,209 INFO L82 PathProgramCache]: Analyzing trace with hash -1793283642, now seen corresponding path program 78 times [2021-05-02 23:43:04,209 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:43:04,209 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1290240221] [2021-05-02 23:43:04,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:43:04,218 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_3321 v_main_~n~0_85) InVars {main_~i~0=v_main_~i~0_3321, main_~n~0=v_main_~n~0_85} OutVars{main_~i~0=v_main_~i~0_3321, main_~n~0=v_main_~n~0_85} AuxVars[] AssignedVars[] [2021-05-02 23:43:04,221 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:43:04,250 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:43:04,262 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:43:04,286 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:43:04,339 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:43:04,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:04,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:43:04,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:04,699 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:43:04,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:04,703 INFO 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 23:43:04,844 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 15 [2021-05-02 23:43:20,189 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:43:20,189 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1290240221] [2021-05-02 23:43:20,189 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1290240221] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:43:20,189 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:43:20,189 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [89] imperfect sequences [] total 89 [2021-05-02 23:43:20,189 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [650244333] [2021-05-02 23:43:20,190 INFO L460 AbstractCegarLoop]: Interpolant automaton has 89 states [2021-05-02 23:43:20,190 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:43:20,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2021-05-02 23:43:20,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=7927, Unknown=0, NotChecked=0, Total=8190 [2021-05-02 23:43:20,191 INFO L87 Difference]: Start difference. First operand 102 states and 103 transitions. Second operand has 89 states, 88 states have (on average 1.0568181818181819) internal successors, (93), 87 states have internal predecessors, (93), 3 states have call successors, (4), 3 states 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 23:43:49,818 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 34 [2021-05-02 23:43:51,019 WARN L205 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 36 [2021-05-02 23:43:52,884 WARN L205 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 30 [2021-05-02 23:43:53,406 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2021-05-02 23:43:54,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:43:54,721 INFO L93 Difference]: Finished difference Result 118 states and 121 transitions. [2021-05-02 23:43:54,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2021-05-02 23:43:54,734 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 88 states have (on average 1.0568181818181819) internal successors, (93), 87 states have internal predecessors, (93), 3 states have call successors, (4), 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 99 [2021-05-02 23:43:54,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:43:54,735 INFO L225 Difference]: With dead ends: 118 [2021-05-02 23:43:54,735 INFO L226 Difference]: Without dead ends: 104 [2021-05-02 23:43:54,737 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4885 ImplicationChecksByTransitivity, 30905.4ms TimeCoverageRelationStatistics Valid=801, Invalid=31061, Unknown=0, NotChecked=0, Total=31862 [2021-05-02 23:43:54,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-05-02 23:43:54,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2021-05-02 23:43:54,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 95 states have (on average 1.0210526315789474) internal successors, (97), 96 states have internal predecessors, (97), 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 23:43:54,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 104 transitions. [2021-05-02 23:43:54,746 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 104 transitions. Word has length 99 [2021-05-02 23:43:54,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:43:54,747 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 104 transitions. [2021-05-02 23:43:54,747 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 89 states, 88 states have (on average 1.0568181818181819) internal successors, (93), 87 states have internal predecessors, (93), 3 states have call successors, (4), 3 states 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 23:43:54,747 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 104 transitions. [2021-05-02 23:43:54,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-05-02 23:43:54,748 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:43:54,748 INFO L523 BasicCegarLoop]: trace histogram [80, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:43:54,748 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79 [2021-05-02 23:43:54,748 INFO L428 AbstractCegarLoop]: === Iteration 81 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:43:54,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:43:54,748 INFO L82 PathProgramCache]: Analyzing trace with hash -373120852, now seen corresponding path program 79 times [2021-05-02 23:43:54,749 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:43:54,749 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1444803288] [2021-05-02 23:43:54,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:43:54,767 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_3403 v_main_~n~0_86) InVars {main_~i~0=v_main_~i~0_3403, main_~n~0=v_main_~n~0_86} OutVars{main_~i~0=v_main_~i~0_3403, main_~n~0=v_main_~n~0_86} AuxVars[] AssignedVars[] [2021-05-02 23:43:54,772 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:43:54,845 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:43:54,879 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:43:54,951 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:43:55,107 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2021-05-02 23:43:55,116 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:43:55,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:55,616 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:43:55,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:55,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:43:55,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:55,630 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:43:55,812 WARN L205 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 15 [2021-05-02 23:44:11,133 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:44:11,133 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1444803288] [2021-05-02 23:44:11,133 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1444803288] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:44:11,133 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:44:11,133 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [90] imperfect sequences [] total 90 [2021-05-02 23:44:11,133 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860837622] [2021-05-02 23:44:11,134 INFO L460 AbstractCegarLoop]: Interpolant automaton has 90 states [2021-05-02 23:44:11,134 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:44:11,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2021-05-02 23:44:11,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=8106, Unknown=0, NotChecked=0, Total=8372 [2021-05-02 23:44:11,135 INFO L87 Difference]: Start difference. First operand 103 states and 104 transitions. Second operand has 90 states, 89 states have (on average 1.0561797752808988) internal successors, (94), 88 states have internal predecessors, (94), 3 states have call successors, (4), 3 states 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 23:44:42,745 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 38 [2021-05-02 23:44:43,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:44:43,902 INFO L93 Difference]: Finished difference Result 119 states and 122 transitions. [2021-05-02 23:44:43,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2021-05-02 23:44:43,905 INFO L78 Accepts]: Start accepts. Automaton has has 90 states, 89 states have (on average 1.0561797752808988) internal successors, (94), 88 states have internal predecessors, (94), 3 states have call successors, (4), 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 100 [2021-05-02 23:44:43,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:44:43,905 INFO L225 Difference]: With dead ends: 119 [2021-05-02 23:44:43,905 INFO L226 Difference]: Without dead ends: 105 [2021-05-02 23:44:43,907 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4986 ImplicationChecksByTransitivity, 30609.4ms TimeCoverageRelationStatistics Valid=810, Invalid=31770, Unknown=0, NotChecked=0, Total=32580 [2021-05-02 23:44:43,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-05-02 23:44:43,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 104. [2021-05-02 23:44:43,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 96 states have (on average 1.0208333333333333) internal successors, (98), 97 states have internal predecessors, (98), 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 23:44:43,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 105 transitions. [2021-05-02 23:44:43,920 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 105 transitions. Word has length 100 [2021-05-02 23:44:43,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:44:43,920 INFO L480 AbstractCegarLoop]: Abstraction has 104 states and 105 transitions. [2021-05-02 23:44:43,932 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 90 states, 89 states have (on average 1.0561797752808988) internal successors, (94), 88 states have internal predecessors, (94), 3 states have call successors, (4), 3 states 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 23:44:43,932 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 105 transitions. [2021-05-02 23:44:43,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 23:44:43,933 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:44:43,933 INFO L523 BasicCegarLoop]: trace histogram [81, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:44:43,933 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80 [2021-05-02 23:44:43,933 INFO L428 AbstractCegarLoop]: === Iteration 82 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:44:43,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:44:43,933 INFO L82 PathProgramCache]: Analyzing trace with hash 702252678, now seen corresponding path program 80 times [2021-05-02 23:44:43,933 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:44:43,933 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1826999138] [2021-05-02 23:44:43,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:44:43,941 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_3486 v_main_~n~0_87) InVars {main_~i~0=v_main_~i~0_3486, main_~n~0=v_main_~n~0_87} OutVars{main_~i~0=v_main_~i~0_3486, main_~n~0=v_main_~n~0_87} AuxVars[] AssignedVars[] [2021-05-02 23:44:43,943 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:44:43,984 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:44:43,995 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:44:44,019 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:44:44,064 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:44:44,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:44,251 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:44:44,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:44,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:44:44,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:44,258 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 23:44:57,003 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:44:57,003 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1826999138] [2021-05-02 23:44:57,003 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1826999138] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:44:57,003 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:44:57,003 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [91] imperfect sequences [] total 91 [2021-05-02 23:44:57,003 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698093763] [2021-05-02 23:44:57,004 INFO L460 AbstractCegarLoop]: Interpolant automaton has 91 states [2021-05-02 23:44:57,004 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:44:57,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2021-05-02 23:44:57,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=268, Invalid=8288, Unknown=0, NotChecked=0, Total=8556 [2021-05-02 23:44:57,005 INFO L87 Difference]: Start difference. First operand 104 states and 105 transitions. Second operand has 91 states, 90 states have (on average 1.0555555555555556) internal successors, (95), 89 states have internal predecessors, (95), 3 states have call successors, (4), 3 states 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 23:44:57,741 WARN L205 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 40