/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/half_2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 23:30:58,742 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 23:30:58,744 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 23:30:58,773 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 23:30:58,803 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 23:30:58,804 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 23:30:58,805 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 23:30:58,809 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 23:30:58,821 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 23:30:58,822 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 23:30:58,823 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 23:30:58,823 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 23:30:58,823 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 23:30:58,823 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 23:30:58,823 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 23:30:58,823 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 23:30:58,824 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 23:30:58,824 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 23:30:58,824 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 23:30:58,824 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 23:30:58,824 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 23:30:58,824 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 23:30:58,824 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 23:30:58,824 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 23:30:58,825 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 23:30:58,825 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 23:30:58,825 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 23:30:58,825 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 23:30:58,825 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-02 23:30:58,825 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 23:30:58,825 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-02 23:30:58,825 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 23:30:59,142 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 23:30:59,158 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 23:30:59,161 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 23:30:59,162 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 23:30:59,162 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 23:30:59,163 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/half_2.i [2021-05-02 23:30:59,236 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/31d1f57c8/a96cae4b4cfd4ac0a5c7ec652c668445/FLAGd0b9f4e69 [2021-05-02 23:30:59,662 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 23:30:59,663 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/half_2.i [2021-05-02 23:30:59,669 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/31d1f57c8/a96cae4b4cfd4ac0a5c7ec652c668445/FLAGd0b9f4e69 [2021-05-02 23:31:00,064 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/31d1f57c8/a96cae4b4cfd4ac0a5c7ec652c668445 [2021-05-02 23:31:00,067 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 23:31:00,072 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 23:31:00,074 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 23:31:00,074 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 23:31:00,077 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 23:31:00,079 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:31:00" (1/1) ... [2021-05-02 23:31:00,080 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@18bd6e84 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:31:00, skipping insertion in model container [2021-05-02 23:31:00,080 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:31:00" (1/1) ... [2021-05-02 23:31:00,086 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 23:31:00,100 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 23:31:00,230 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/half_2.i[893,906] [2021-05-02 23:31:00,254 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 23:31:00,262 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 23:31:00,273 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/half_2.i[893,906] [2021-05-02 23:31:00,281 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 23:31:00,296 INFO L208 MainTranslator]: Completed translation [2021-05-02 23:31:00,296 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:31:00 WrapperNode [2021-05-02 23:31:00,296 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 23:31:00,297 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 23:31:00,297 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 23:31:00,297 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 23:31:00,304 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:31:00" (1/1) ... [2021-05-02 23:31:00,305 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:31:00" (1/1) ... [2021-05-02 23:31:00,309 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:31:00" (1/1) ... [2021-05-02 23:31:00,310 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:31:00" (1/1) ... [2021-05-02 23:31:00,346 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:31:00" (1/1) ... [2021-05-02 23:31:00,349 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:31:00" (1/1) ... [2021-05-02 23:31:00,350 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:31:00" (1/1) ... [2021-05-02 23:31:00,351 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 23:31:00,352 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 23:31:00,352 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 23:31:00,352 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 23:31:00,352 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:31:00" (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 23:31:00,422 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 23:31:00,423 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 23:31:00,423 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 23:31:00,423 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 23:31:00,423 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 23:31:00,423 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 23:31:00,424 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 23:31:00,424 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 23:31:00,424 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 23:31:00,424 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 23:31:00,424 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 23:31:00,424 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 23:31:00,425 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 23:31:00,425 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 23:31:00,425 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 23:31:00,425 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 23:31:00,425 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 23:31:00,426 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 23:31:00,426 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 23:31:00,427 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 23:31:00,427 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 23:31:00,427 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 23:31:00,639 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 23:31:00,639 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 23:31:00,640 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:31:00 BoogieIcfgContainer [2021-05-02 23:31:00,640 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 23:31:00,641 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 23:31:00,641 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 23:31:00,643 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 23:31:00,643 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 11:31:00" (1/3) ... [2021-05-02 23:31:00,644 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61a106b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:31:00, skipping insertion in model container [2021-05-02 23:31:00,644 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:31:00" (2/3) ... [2021-05-02 23:31:00,644 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61a106b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:31:00, skipping insertion in model container [2021-05-02 23:31:00,644 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:31:00" (3/3) ... [2021-05-02 23:31:00,645 INFO L111 eAbstractionObserver]: Analyzing ICFG half_2.i [2021-05-02 23:31:00,648 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-02 23:31:00,650 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 23:31:00,661 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 23:31:00,673 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 23:31:00,673 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 23:31:00,673 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-02 23:31:00,673 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 23:31:00,673 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 23:31:00,673 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 23:31:00,673 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 23:31:00,673 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 23:31:00,681 INFO L276 IsEmpty]: Start isEmpty. Operand has 23 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 16 states have internal predecessors, (22), 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 23:31:00,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 23:31:00,685 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:00,686 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:00,686 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:00,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:00,689 INFO L82 PathProgramCache]: Analyzing trace with hash 21938802, now seen corresponding path program 1 times [2021-05-02 23:31:00,694 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:00,694 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [366519634] [2021-05-02 23:31:00,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:00,732 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:31:00,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:00,906 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:00,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:00,916 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:31:00,917 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:00,917 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [366519634] [2021-05-02 23:31:00,918 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [366519634] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:00,919 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:00,919 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 23:31:00,919 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675469652] [2021-05-02 23:31:00,921 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 23:31:00,922 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:00,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 23:31:00,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-05-02 23:31:00,931 INFO L87 Difference]: Start difference. First operand has 23 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 16 states have internal predecessors, (22), 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 1.6666666666666667) internal successors, (10), 5 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 23:31:01,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:01,121 INFO L93 Difference]: Finished difference Result 44 states and 56 transitions. [2021-05-02 23:31:01,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 23:31:01,122 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 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 23:31:01,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:01,126 INFO L225 Difference]: With dead ends: 44 [2021-05-02 23:31:01,126 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 23:31:01,128 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 136.6ms TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2021-05-02 23:31:01,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 23:31:01,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-02 23:31:01,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 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 23:31:01,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-02 23:31:01,165 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2021-05-02 23:31:01,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:01,165 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-02 23:31:01,166 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 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 23:31:01,166 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-02 23:31:01,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 23:31:01,166 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:01,167 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:01,167 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 23:31:01,168 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:01,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:01,169 INFO L82 PathProgramCache]: Analyzing trace with hash -1438800602, now seen corresponding path program 1 times [2021-05-02 23:31:01,169 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:01,170 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [787389112] [2021-05-02 23:31:01,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:01,203 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_7 v_main_~n~0_10) InVars {main_~i~0=v_main_~i~0_7, main_~n~0=v_main_~n~0_10} OutVars{main_~i~0=v_main_~i~0_7, main_~n~0=v_main_~n~0_10} AuxVars[] AssignedVars[] [2021-05-02 23:31:01,216 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:31:01,220 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:01,233 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:31:01,273 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:31:01,299 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:01,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:01,401 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:01,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:01,408 INFO 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 23:31:01,493 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:01,494 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [787389112] [2021-05-02 23:31:01,494 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [787389112] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:01,494 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:01,494 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-02 23:31:01,494 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826113499] [2021-05-02 23:31:01,495 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 23:31:01,495 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:01,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 23:31:01,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-02 23:31:01,496 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:31:02,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:02,008 INFO L93 Difference]: Finished difference Result 35 states and 39 transitions. [2021-05-02 23:31:02,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 23:31:02,008 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 23:31:02,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:02,012 INFO L225 Difference]: With dead ends: 35 [2021-05-02 23:31:02,012 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 23:31:02,014 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 483.9ms TimeCoverageRelationStatistics Valid=107, Invalid=355, Unknown=0, NotChecked=0, Total=462 [2021-05-02 23:31:02,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 23:31:02,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 28. [2021-05-02 23:31:02,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.2) internal successors, (24), 21 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 23:31:02,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2021-05-02 23:31:02,025 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 15 [2021-05-02 23:31:02,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:02,025 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2021-05-02 23:31:02,025 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:31:02,025 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2021-05-02 23:31:02,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 23:31:02,026 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:02,026 INFO L523 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:02,026 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 23:31:02,026 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:02,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:02,027 INFO L82 PathProgramCache]: Analyzing trace with hash 1206656678, now seen corresponding path program 2 times [2021-05-02 23:31:02,027 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:02,027 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [180644370] [2021-05-02 23:31:02,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:02,033 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_11 v_main_~n~0_11) InVars {main_~i~0=v_main_~i~0_11, main_~n~0=v_main_~n~0_11} OutVars{main_~i~0=v_main_~i~0_11, main_~n~0=v_main_~n~0_11} AuxVars[] AssignedVars[] [2021-05-02 23:31:02,039 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:31:02,059 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:02,067 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:31:02,080 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:31:02,107 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:02,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:02,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:02,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:02,224 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:31:02,345 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:02,345 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [180644370] [2021-05-02 23:31:02,345 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [180644370] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:02,345 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:02,346 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-02 23:31:02,346 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666213377] [2021-05-02 23:31:02,346 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 23:31:02,346 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:02,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 23:31:02,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-02 23:31:02,347 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:31:03,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:03,177 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2021-05-02 23:31:03,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 23:31:03,178 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 23:31:03,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:03,179 INFO L225 Difference]: With dead ends: 52 [2021-05-02 23:31:03,179 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 23:31:03,179 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 744.8ms TimeCoverageRelationStatistics Valid=174, Invalid=696, Unknown=0, NotChecked=0, Total=870 [2021-05-02 23:31:03,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 23:31:03,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 41. [2021-05-02 23:31:03,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 30 states have (on average 1.2) internal successors, (36), 32 states have internal predecessors, (36), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 23:31:03,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 47 transitions. [2021-05-02 23:31:03,188 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 47 transitions. Word has length 17 [2021-05-02 23:31:03,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:03,189 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 47 transitions. [2021-05-02 23:31:03,189 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:31:03,189 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 47 transitions. [2021-05-02 23:31:03,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 23:31:03,190 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:03,190 INFO L523 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:03,191 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 23:31:03,191 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:03,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:03,191 INFO L82 PathProgramCache]: Analyzing trace with hash 870463526, now seen corresponding path program 3 times [2021-05-02 23:31:03,191 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:03,192 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1891714790] [2021-05-02 23:31:03,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:03,197 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_17 v_main_~n~0_12) InVars {main_~i~0=v_main_~i~0_17, main_~n~0=v_main_~n~0_12} OutVars{main_~i~0=v_main_~i~0_17, main_~n~0=v_main_~n~0_12} AuxVars[] AssignedVars[] [2021-05-02 23:31:03,201 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:31:03,213 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:03,221 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:31:03,234 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:31:03,249 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:03,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:03,342 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:03,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:03,349 INFO 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 23:31:03,523 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:03,523 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1891714790] [2021-05-02 23:31:03,524 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1891714790] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:03,524 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:03,524 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-02 23:31:03,524 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1704873939] [2021-05-02 23:31:03,526 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 23:31:03,526 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:03,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 23:31:03,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-02 23:31:03,528 INFO L87 Difference]: Start difference. First operand 41 states and 47 transitions. Second operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 12 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:31:04,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:04,868 INFO L93 Difference]: Finished difference Result 68 states and 80 transitions. [2021-05-02 23:31:04,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 23:31:04,869 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 12 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-02 23:31:04,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:04,873 INFO L225 Difference]: With dead ends: 68 [2021-05-02 23:31:04,873 INFO L226 Difference]: Without dead ends: 66 [2021-05-02 23:31:04,874 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 301 ImplicationChecksByTransitivity, 1132.4ms TimeCoverageRelationStatistics Valid=248, Invalid=1158, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 23:31:04,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-02 23:31:04,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 43. [2021-05-02 23:31:04,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 32 states have (on average 1.25) internal successors, (40), 34 states have internal predecessors, (40), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 23:31:04,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2021-05-02 23:31:04,897 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 19 [2021-05-02 23:31:04,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:04,898 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2021-05-02 23:31:04,898 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 12 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:31:04,898 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2021-05-02 23:31:04,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 23:31:04,899 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:04,900 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:04,900 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 23:31:04,900 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:04,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:04,900 INFO L82 PathProgramCache]: Analyzing trace with hash 810760849, now seen corresponding path program 1 times [2021-05-02 23:31:04,901 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:04,901 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1233389188] [2021-05-02 23:31:04,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:04,909 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_25 v_main_~n~0_13) InVars {main_~i~0=v_main_~i~0_25, main_~n~0=v_main_~n~0_13} OutVars{main_~i~0=v_main_~i~0_25, main_~n~0=v_main_~n~0_13} AuxVars[] AssignedVars[] [2021-05-02 23:31:04,917 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:31:04,931 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:04,940 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:31:04,957 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:31:04,980 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:05,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:05,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:05,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:05,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:31:05,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:05,231 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:31:05,320 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:05,320 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1233389188] [2021-05-02 23:31:05,321 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1233389188] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:05,321 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:05,321 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-02 23:31:05,321 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [582791670] [2021-05-02 23:31:05,322 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 23:31:05,322 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:05,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 23:31:05,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2021-05-02 23:31:05,323 INFO L87 Difference]: Start difference. First operand 43 states and 51 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 23:31:05,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:05,939 INFO L93 Difference]: Finished difference Result 57 states and 66 transitions. [2021-05-02 23:31:05,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 23:31:05,945 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 23:31:05,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:05,946 INFO L225 Difference]: With dead ends: 57 [2021-05-02 23:31:05,946 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 23:31:05,947 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 627.5ms TimeCoverageRelationStatistics Valid=120, Invalid=480, Unknown=0, NotChecked=0, Total=600 [2021-05-02 23:31:05,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 23:31:05,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-02 23:31:05,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 27 states have (on average 1.2222222222222223) internal successors, (33), 28 states have internal predecessors, (33), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:31:05,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2021-05-02 23:31:05,953 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 22 [2021-05-02 23:31:05,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:05,953 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2021-05-02 23:31:05,953 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 23:31:05,953 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2021-05-02 23:31:05,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 23:31:05,955 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:05,955 INFO L523 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:05,955 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-02 23:31:05,955 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:05,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:05,968 INFO L82 PathProgramCache]: Analyzing trace with hash -88608346, now seen corresponding path program 4 times [2021-05-02 23:31:05,968 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:05,968 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [962113285] [2021-05-02 23:31:05,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:05,974 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_29 v_main_~n~0_14) InVars {main_~i~0=v_main_~i~0_29, main_~n~0=v_main_~n~0_14} OutVars{main_~i~0=v_main_~i~0_29, main_~n~0=v_main_~n~0_14} AuxVars[] AssignedVars[] [2021-05-02 23:31:05,977 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:31:05,994 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:06,001 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:31:06,017 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:31:06,033 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:06,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:06,131 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:06,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:06,145 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:31:06,347 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:06,348 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [962113285] [2021-05-02 23:31:06,348 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [962113285] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:06,348 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:06,348 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-02 23:31:06,348 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274365062] [2021-05-02 23:31:06,348 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 23:31:06,348 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:06,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 23:31:06,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-05-02 23:31:06,349 INFO L87 Difference]: Start difference. First operand 36 states and 42 transitions. Second operand has 16 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 14 states have internal predecessors, (17), 2 states have call successors, (3), 3 states 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 23:31:07,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:07,641 INFO L93 Difference]: Finished difference Result 66 states and 79 transitions. [2021-05-02 23:31:07,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 23:31:07,641 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 14 states have internal predecessors, (17), 2 states have call successors, (3), 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 21 [2021-05-02 23:31:07,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:07,642 INFO L225 Difference]: With dead ends: 66 [2021-05-02 23:31:07,642 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 23:31:07,643 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 340 ImplicationChecksByTransitivity, 1112.0ms TimeCoverageRelationStatistics Valid=264, Invalid=1376, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 23:31:07,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 23:31:07,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 38. [2021-05-02 23:31:07,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 30 states have internal predecessors, (37), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:31:07,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2021-05-02 23:31:07,651 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 21 [2021-05-02 23:31:07,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:07,651 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2021-05-02 23:31:07,651 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 14 states have internal predecessors, (17), 2 states have call successors, (3), 3 states 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 23:31:07,652 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2021-05-02 23:31:07,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 23:31:07,652 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:07,652 INFO L523 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:07,652 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-02 23:31:07,653 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:07,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:07,653 INFO L82 PathProgramCache]: Analyzing trace with hash 1661291302, now seen corresponding path program 5 times [2021-05-02 23:31:07,653 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:07,653 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [332781703] [2021-05-02 23:31:07,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:07,659 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_39 v_main_~n~0_15) InVars {main_~i~0=v_main_~i~0_39, main_~n~0=v_main_~n~0_15} OutVars{main_~i~0=v_main_~i~0_39, main_~n~0=v_main_~n~0_15} AuxVars[] AssignedVars[] [2021-05-02 23:31:07,662 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:31:07,664 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:07,672 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:31:07,699 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:31:07,716 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:07,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:07,822 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:07,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:07,828 INFO 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 23:31:08,081 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:08,082 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [332781703] [2021-05-02 23:31:08,082 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [332781703] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:08,082 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:08,082 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-02 23:31:08,082 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311900306] [2021-05-02 23:31:08,082 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 23:31:08,082 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:08,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 23:31:08,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=309, Unknown=0, NotChecked=0, Total=380 [2021-05-02 23:31:08,083 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand has 18 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 16 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:31:09,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:09,858 INFO L93 Difference]: Finished difference Result 76 states and 93 transitions. [2021-05-02 23:31:09,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 23:31:09,859 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 16 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-02 23:31:09,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:09,860 INFO L225 Difference]: With dead ends: 76 [2021-05-02 23:31:09,861 INFO L226 Difference]: Without dead ends: 74 [2021-05-02 23:31:09,862 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 534 ImplicationChecksByTransitivity, 1517.7ms TimeCoverageRelationStatistics Valid=379, Invalid=2071, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 23:31:09,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-02 23:31:09,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 40. [2021-05-02 23:31:09,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 31 states have (on average 1.3225806451612903) internal successors, (41), 32 states have internal predecessors, (41), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:31:09,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2021-05-02 23:31:09,877 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 23 [2021-05-02 23:31:09,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:09,877 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2021-05-02 23:31:09,877 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 16 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:31:09,877 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2021-05-02 23:31:09,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 23:31:09,878 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:09,878 INFO L523 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:09,878 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-02 23:31:09,878 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:09,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:09,879 INFO L82 PathProgramCache]: Analyzing trace with hash -312327002, now seen corresponding path program 6 times [2021-05-02 23:31:09,879 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:09,879 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [129339806] [2021-05-02 23:31:09,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:09,889 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_51 v_main_~n~0_16) InVars {main_~i~0=v_main_~i~0_51, main_~n~0=v_main_~n~0_16} OutVars{main_~i~0=v_main_~i~0_51, main_~n~0=v_main_~n~0_16} AuxVars[] AssignedVars[] [2021-05-02 23:31:09,894 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:31:09,895 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:09,903 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:31:09,927 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:31:09,943 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:09,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:10,051 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:10,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:10,060 INFO 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 23:31:10,357 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:10,357 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [129339806] [2021-05-02 23:31:10,358 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [129339806] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:10,358 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:10,360 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-02 23:31:10,360 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [433370692] [2021-05-02 23:31:10,360 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 23:31:10,360 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:10,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 23:31:10,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-05-02 23:31:10,361 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 18 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:31:12,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:12,346 INFO L93 Difference]: Finished difference Result 86 states and 107 transitions. [2021-05-02 23:31:12,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 23:31:12,347 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 18 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-05-02 23:31:12,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:12,349 INFO L225 Difference]: With dead ends: 86 [2021-05-02 23:31:12,349 INFO L226 Difference]: Without dead ends: 84 [2021-05-02 23:31:12,352 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 740 ImplicationChecksByTransitivity, 1771.1ms TimeCoverageRelationStatistics Valid=461, Invalid=2845, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 23:31:12,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-02 23:31:12,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 42. [2021-05-02 23:31:12,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 33 states have (on average 1.3636363636363635) internal successors, (45), 34 states have internal predecessors, (45), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:31:12,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 54 transitions. [2021-05-02 23:31:12,365 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 54 transitions. Word has length 25 [2021-05-02 23:31:12,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:12,365 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 54 transitions. [2021-05-02 23:31:12,365 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 18 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:31:12,365 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 54 transitions. [2021-05-02 23:31:12,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 23:31:12,367 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:12,367 INFO L523 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:12,367 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-02 23:31:12,367 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:12,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:12,368 INFO L82 PathProgramCache]: Analyzing trace with hash 1416027686, now seen corresponding path program 7 times [2021-05-02 23:31:12,368 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:12,368 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1514425467] [2021-05-02 23:31:12,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:12,373 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_65 v_main_~n~0_17) InVars {main_~i~0=v_main_~i~0_65, main_~n~0=v_main_~n~0_17} OutVars{main_~i~0=v_main_~i~0_65, main_~n~0=v_main_~n~0_17} AuxVars[] AssignedVars[] [2021-05-02 23:31:12,375 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:31:12,376 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:12,382 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:31:12,400 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:31:12,414 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:12,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:12,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:12,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:12,503 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:31:12,808 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:12,808 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1514425467] [2021-05-02 23:31:12,808 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1514425467] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:12,808 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:12,808 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-02 23:31:12,809 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275941261] [2021-05-02 23:31:12,809 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 23:31:12,809 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:12,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 23:31:12,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=461, Unknown=0, NotChecked=0, Total=552 [2021-05-02 23:31:12,809 INFO L87 Difference]: Start difference. First operand 42 states and 54 transitions. Second operand has 22 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 20 states have internal predecessors, (23), 2 states have call successors, (3), 3 states 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 23:31:15,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:15,172 INFO L93 Difference]: Finished difference Result 96 states and 121 transitions. [2021-05-02 23:31:15,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 23:31:15,173 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 20 states have internal predecessors, (23), 2 states have call successors, (3), 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 27 [2021-05-02 23:31:15,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:15,174 INFO L225 Difference]: With dead ends: 96 [2021-05-02 23:31:15,174 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 23:31:15,175 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 977 ImplicationChecksByTransitivity, 2033.7ms TimeCoverageRelationStatistics Valid=543, Invalid=3747, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 23:31:15,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 23:31:15,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 44. [2021-05-02 23:31:15,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 35 states have (on average 1.4) internal successors, (49), 36 states have internal predecessors, (49), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:31:15,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 58 transitions. [2021-05-02 23:31:15,181 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 58 transitions. Word has length 27 [2021-05-02 23:31:15,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:15,182 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 58 transitions. [2021-05-02 23:31:15,182 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 20 states have internal predecessors, (23), 2 states have call successors, (3), 3 states 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 23:31:15,182 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 58 transitions. [2021-05-02 23:31:15,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 23:31:15,182 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:15,182 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:15,183 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-02 23:31:15,183 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:15,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:15,183 INFO L82 PathProgramCache]: Analyzing trace with hash -889872314, now seen corresponding path program 2 times [2021-05-02 23:31:15,183 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:15,183 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1162569341] [2021-05-02 23:31:15,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:15,188 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_81 v_main_~n~0_18) InVars {main_~i~0=v_main_~i~0_81, main_~n~0=v_main_~n~0_18} OutVars{main_~i~0=v_main_~i~0_81, main_~n~0=v_main_~n~0_18} AuxVars[] AssignedVars[] [2021-05-02 23:31:15,190 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:31:15,190 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:15,195 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:31:15,212 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:31:15,224 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:15,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:15,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:15,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:15,488 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:31:15,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:15,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:31:15,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:15,501 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:31:15,606 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:15,607 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1162569341] [2021-05-02 23:31:15,607 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1162569341] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:15,607 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:15,607 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-02 23:31:15,607 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365568063] [2021-05-02 23:31:15,607 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 23:31:15,607 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:15,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 23:31:15,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 23:31:15,608 INFO L87 Difference]: Start difference. First operand 44 states and 58 transitions. Second operand has 15 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 13 states have internal predecessors, (20), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:31:16,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:16,189 INFO L93 Difference]: Finished difference Result 68 states and 84 transitions. [2021-05-02 23:31:16,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 23:31:16,189 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 13 states have internal predecessors, (20), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 31 [2021-05-02 23:31:16,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:16,190 INFO L225 Difference]: With dead ends: 68 [2021-05-02 23:31:16,190 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 23:31:16,190 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 697.9ms TimeCoverageRelationStatistics Valid=137, Invalid=675, Unknown=0, NotChecked=0, Total=812 [2021-05-02 23:31:16,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 23:31:16,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-05-02 23:31:16,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 36 states have internal predecessors, (47), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:31:16,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 56 transitions. [2021-05-02 23:31:16,196 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 56 transitions. Word has length 31 [2021-05-02 23:31:16,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:16,196 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 56 transitions. [2021-05-02 23:31:16,196 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 13 states have internal predecessors, (20), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:31:16,196 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 56 transitions. [2021-05-02 23:31:16,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 23:31:16,196 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:16,197 INFO L523 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:16,197 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-02 23:31:16,197 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:16,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:16,197 INFO L82 PathProgramCache]: Analyzing trace with hash 212539302, now seen corresponding path program 8 times [2021-05-02 23:31:16,197 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:16,197 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [801521393] [2021-05-02 23:31:16,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:16,203 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_87 v_main_~n~0_19) InVars {main_~i~0=v_main_~i~0_87, main_~n~0=v_main_~n~0_19} OutVars{main_~i~0=v_main_~i~0_87, main_~n~0=v_main_~n~0_19} AuxVars[] AssignedVars[] [2021-05-02 23:31:16,205 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:31:16,206 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:16,210 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:31:16,228 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:31:16,241 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:16,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:16,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:16,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:16,307 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:31:16,680 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:16,681 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [801521393] [2021-05-02 23:31:16,681 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [801521393] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:16,681 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:16,681 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-02 23:31:16,681 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221818735] [2021-05-02 23:31:16,681 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 23:31:16,681 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:16,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 23:31:16,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=520, Unknown=0, NotChecked=0, Total=600 [2021-05-02 23:31:16,682 INFO L87 Difference]: Start difference. First operand 44 states and 56 transitions. Second operand has 24 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 22 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:31:19,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:19,076 INFO L93 Difference]: Finished difference Result 98 states and 123 transitions. [2021-05-02 23:31:19,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 23:31:19,076 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 22 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 23:31:19,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:19,077 INFO L225 Difference]: With dead ends: 98 [2021-05-02 23:31:19,077 INFO L226 Difference]: Without dead ends: 96 [2021-05-02 23:31:19,078 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1052 ImplicationChecksByTransitivity, 2126.6ms TimeCoverageRelationStatistics Valid=510, Invalid=4182, Unknown=0, NotChecked=0, Total=4692 [2021-05-02 23:31:19,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-02 23:31:19,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 46. [2021-05-02 23:31:19,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 37 states have (on average 1.3783783783783783) internal successors, (51), 38 states have internal predecessors, (51), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:31:19,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 60 transitions. [2021-05-02 23:31:19,085 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 60 transitions. Word has length 29 [2021-05-02 23:31:19,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:19,086 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 60 transitions. [2021-05-02 23:31:19,086 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 22 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:31:19,086 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 60 transitions. [2021-05-02 23:31:19,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 23:31:19,086 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:19,086 INFO L523 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:19,087 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-05-02 23:31:19,087 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:19,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:19,087 INFO L82 PathProgramCache]: Analyzing trace with hash -343860794, now seen corresponding path program 3 times [2021-05-02 23:31:19,087 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:19,087 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1628030553] [2021-05-02 23:31:19,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:19,091 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_105 v_main_~n~0_20) InVars {main_~i~0=v_main_~i~0_105, main_~n~0=v_main_~n~0_20} OutVars{main_~i~0=v_main_~i~0_105, main_~n~0=v_main_~n~0_20} AuxVars[] AssignedVars[] [2021-05-02 23:31:19,093 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:31:19,102 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:19,112 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:31:19,124 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:31:19,140 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:19,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:19,390 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:19,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:19,395 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:31:19,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:19,398 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:31:19,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:19,416 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:31:19,573 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:19,573 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1628030553] [2021-05-02 23:31:19,574 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1628030553] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:19,574 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:19,574 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-02 23:31:19,574 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108479696] [2021-05-02 23:31:19,574 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 23:31:19,574 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:19,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 23:31:19,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-05-02 23:31:19,575 INFO L87 Difference]: Start difference. First operand 46 states and 60 transitions. Second operand has 17 states, 16 states have (on average 1.375) internal successors, (22), 15 states have internal predecessors, (22), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:31:20,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:20,182 INFO L93 Difference]: Finished difference Result 70 states and 86 transitions. [2021-05-02 23:31:20,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 23:31:20,183 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.375) internal successors, (22), 15 states have internal predecessors, (22), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 33 [2021-05-02 23:31:20,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:20,183 INFO L225 Difference]: With dead ends: 70 [2021-05-02 23:31:20,184 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 23:31:20,184 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 778.0ms TimeCoverageRelationStatistics Valid=159, Invalid=897, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 23:31:20,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 23:31:20,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-05-02 23:31:20,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 37 states have (on average 1.3243243243243243) internal successors, (49), 38 states have internal predecessors, (49), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:31:20,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 58 transitions. [2021-05-02 23:31:20,190 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 58 transitions. Word has length 33 [2021-05-02 23:31:20,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:20,190 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 58 transitions. [2021-05-02 23:31:20,190 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 1.375) internal successors, (22), 15 states have internal predecessors, (22), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:31:20,190 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 58 transitions. [2021-05-02 23:31:20,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 23:31:20,191 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:20,191 INFO L523 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:20,191 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-02 23:31:20,191 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:20,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:20,191 INFO L82 PathProgramCache]: Analyzing trace with hash -993595098, now seen corresponding path program 9 times [2021-05-02 23:31:20,191 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:20,191 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1757818662] [2021-05-02 23:31:20,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:20,195 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_113 v_main_~n~0_21) InVars {main_~i~0=v_main_~i~0_113, main_~n~0=v_main_~n~0_21} OutVars{main_~i~0=v_main_~i~0_113, main_~n~0=v_main_~n~0_21} AuxVars[] AssignedVars[] [2021-05-02 23:31:20,196 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:31:20,206 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:20,211 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:31:20,219 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:31:20,233 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:20,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:20,301 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:20,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:20,307 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:31:20,787 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:20,787 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1757818662] [2021-05-02 23:31:20,787 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1757818662] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:20,787 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:20,787 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-02 23:31:20,787 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805815181] [2021-05-02 23:31:20,788 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 23:31:20,788 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:20,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 23:31:20,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=614, Unknown=0, NotChecked=0, Total=702 [2021-05-02 23:31:20,789 INFO L87 Difference]: Start difference. First operand 46 states and 58 transitions. Second operand has 26 states, 25 states have (on average 1.08) internal successors, (27), 24 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:31:23,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:23,353 INFO L93 Difference]: Finished difference Result 100 states and 125 transitions. [2021-05-02 23:31:23,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 23:31:23,353 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.08) internal successors, (27), 24 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-02 23:31:23,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:23,354 INFO L225 Difference]: With dead ends: 100 [2021-05-02 23:31:23,354 INFO L226 Difference]: Without dead ends: 98 [2021-05-02 23:31:23,355 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1157 ImplicationChecksByTransitivity, 2385.6ms TimeCoverageRelationStatistics Valid=534, Invalid=4722, Unknown=0, NotChecked=0, Total=5256 [2021-05-02 23:31:23,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-02 23:31:23,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 48. [2021-05-02 23:31:23,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 39 states have (on average 1.358974358974359) internal successors, (53), 40 states have internal predecessors, (53), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:31:23,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 62 transitions. [2021-05-02 23:31:23,362 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 62 transitions. Word has length 31 [2021-05-02 23:31:23,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:23,363 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 62 transitions. [2021-05-02 23:31:23,363 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 1.08) internal successors, (27), 24 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:31:23,363 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 62 transitions. [2021-05-02 23:31:23,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 23:31:23,363 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:23,363 INFO L523 BasicCegarLoop]: trace histogram [7, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:23,363 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-05-02 23:31:23,364 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:23,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:23,364 INFO L82 PathProgramCache]: Analyzing trace with hash 387199814, now seen corresponding path program 4 times [2021-05-02 23:31:23,364 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:23,364 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [535465860] [2021-05-02 23:31:23,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:23,367 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_133 v_main_~n~0_22) InVars {main_~i~0=v_main_~i~0_133, main_~n~0=v_main_~n~0_22} OutVars{main_~i~0=v_main_~i~0_133, main_~n~0=v_main_~n~0_22} AuxVars[] AssignedVars[] [2021-05-02 23:31:23,369 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:31:23,369 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:23,374 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:31:23,391 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:31:23,404 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:23,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:23,645 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:23,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:23,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:31:23,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:23,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:31:23,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:23,659 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:31:23,843 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:23,843 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [535465860] [2021-05-02 23:31:23,843 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [535465860] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:23,844 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:23,844 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-02 23:31:23,844 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148207483] [2021-05-02 23:31:23,844 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 23:31:23,844 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:23,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 23:31:23,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2021-05-02 23:31:23,845 INFO L87 Difference]: Start difference. First operand 48 states and 62 transitions. Second operand has 19 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 17 states have internal predecessors, (24), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:31:24,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:24,523 INFO L93 Difference]: Finished difference Result 72 states and 88 transitions. [2021-05-02 23:31:24,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 23:31:24,523 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 17 states have internal predecessors, (24), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 35 [2021-05-02 23:31:24,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:24,524 INFO L225 Difference]: With dead ends: 72 [2021-05-02 23:31:24,524 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 23:31:24,525 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 267 ImplicationChecksByTransitivity, 858.6ms TimeCoverageRelationStatistics Valid=181, Invalid=1151, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 23:31:24,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 23:31:24,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-05-02 23:31:24,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 39 states have (on average 1.3076923076923077) internal successors, (51), 40 states have internal predecessors, (51), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:31:24,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 60 transitions. [2021-05-02 23:31:24,532 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 60 transitions. Word has length 35 [2021-05-02 23:31:24,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:24,532 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 60 transitions. [2021-05-02 23:31:24,532 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 17 states have internal predecessors, (24), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:31:24,532 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 60 transitions. [2021-05-02 23:31:24,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 23:31:24,533 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:24,533 INFO L523 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:24,533 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-02 23:31:24,533 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:24,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:24,533 INFO L82 PathProgramCache]: Analyzing trace with hash -447583578, now seen corresponding path program 10 times [2021-05-02 23:31:24,533 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:24,534 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1956327870] [2021-05-02 23:31:24,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:24,537 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_143 v_main_~n~0_23) InVars {main_~i~0=v_main_~i~0_143, main_~n~0=v_main_~n~0_23} OutVars{main_~i~0=v_main_~i~0_143, main_~n~0=v_main_~n~0_23} AuxVars[] AssignedVars[] [2021-05-02 23:31:24,539 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:31:24,539 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:24,544 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:31:24,565 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:31:24,578 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:24,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:24,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:24,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:24,651 INFO 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 23:31:25,129 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:25,129 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1956327870] [2021-05-02 23:31:25,130 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1956327870] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:25,130 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:25,130 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-02 23:31:25,130 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [475565071] [2021-05-02 23:31:25,130 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 23:31:25,130 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:25,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 23:31:25,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=749, Unknown=0, NotChecked=0, Total=870 [2021-05-02 23:31:25,131 INFO L87 Difference]: Start difference. First operand 48 states and 60 transitions. Second operand has 28 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 26 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:31:27,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:27,848 INFO L93 Difference]: Finished difference Result 102 states and 127 transitions. [2021-05-02 23:31:27,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 23:31:27,848 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 26 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-05-02 23:31:27,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:27,849 INFO L225 Difference]: With dead ends: 102 [2021-05-02 23:31:27,849 INFO L226 Difference]: Without dead ends: 100 [2021-05-02 23:31:27,850 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1298 ImplicationChecksByTransitivity, 2447.7ms TimeCoverageRelationStatistics Valid=627, Invalid=5379, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 23:31:27,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-05-02 23:31:27,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 50. [2021-05-02 23:31:27,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 41 states have (on average 1.3414634146341464) internal successors, (55), 42 states have internal predecessors, (55), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:31:27,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 64 transitions. [2021-05-02 23:31:27,858 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 64 transitions. Word has length 33 [2021-05-02 23:31:27,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:27,858 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 64 transitions. [2021-05-02 23:31:27,858 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 26 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:31:27,858 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 64 transitions. [2021-05-02 23:31:27,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 23:31:27,859 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:27,859 INFO L523 BasicCegarLoop]: trace histogram [9, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:27,859 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-02 23:31:27,859 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:27,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:27,859 INFO L82 PathProgramCache]: Analyzing trace with hash -1438192442, now seen corresponding path program 5 times [2021-05-02 23:31:27,859 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:27,859 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2018745485] [2021-05-02 23:31:27,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:27,863 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_165 v_main_~n~0_24) InVars {main_~i~0=v_main_~i~0_165, main_~n~0=v_main_~n~0_24} OutVars{main_~i~0=v_main_~i~0_165, main_~n~0=v_main_~n~0_24} AuxVars[] AssignedVars[] [2021-05-02 23:31:27,864 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:31:27,865 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:27,870 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:31:27,887 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:31:27,901 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:27,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:28,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:28,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:28,106 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:31:28,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:28,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:31:28,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:28,125 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:31:28,378 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:28,379 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2018745485] [2021-05-02 23:31:28,379 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2018745485] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:28,379 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:28,379 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-02 23:31:28,379 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188709646] [2021-05-02 23:31:28,379 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 23:31:28,379 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:28,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 23:31:28,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=426, Unknown=0, NotChecked=0, Total=506 [2021-05-02 23:31:28,380 INFO L87 Difference]: Start difference. First operand 50 states and 64 transitions. Second operand has 21 states, 20 states have (on average 1.3) internal successors, (26), 19 states have internal predecessors, (26), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:31:29,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:29,182 INFO L93 Difference]: Finished difference Result 74 states and 90 transitions. [2021-05-02 23:31:29,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 23:31:29,182 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.3) internal successors, (26), 19 states have internal predecessors, (26), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 37 [2021-05-02 23:31:29,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:29,183 INFO L225 Difference]: With dead ends: 74 [2021-05-02 23:31:29,183 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 23:31:29,184 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 357 ImplicationChecksByTransitivity, 972.3ms TimeCoverageRelationStatistics Valid=232, Invalid=1490, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 23:31:29,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 23:31:29,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-05-02 23:31:29,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 41 states have (on average 1.2926829268292683) internal successors, (53), 42 states have internal predecessors, (53), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:31:29,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 62 transitions. [2021-05-02 23:31:29,190 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 62 transitions. Word has length 37 [2021-05-02 23:31:29,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:29,190 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 62 transitions. [2021-05-02 23:31:29,190 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 1.3) internal successors, (26), 19 states have internal predecessors, (26), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:31:29,191 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 62 transitions. [2021-05-02 23:31:29,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 23:31:29,191 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:29,191 INFO L523 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:29,191 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-05-02 23:31:29,191 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:29,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:29,191 INFO L82 PathProgramCache]: Analyzing trace with hash 283477030, now seen corresponding path program 11 times [2021-05-02 23:31:29,191 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:29,191 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1636579714] [2021-05-02 23:31:29,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:29,195 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_177 v_main_~n~0_25) InVars {main_~i~0=v_main_~i~0_177, main_~n~0=v_main_~n~0_25} OutVars{main_~i~0=v_main_~i~0_177, main_~n~0=v_main_~n~0_25} AuxVars[] AssignedVars[] [2021-05-02 23:31:29,203 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:31:29,208 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:29,213 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:31:29,232 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:31:29,245 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:29,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:29,303 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:29,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:29,313 INFO 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 23:31:29,869 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:29,869 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1636579714] [2021-05-02 23:31:29,869 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1636579714] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:29,869 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:29,869 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-02 23:31:29,870 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398419476] [2021-05-02 23:31:29,870 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 23:31:29,870 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:29,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 23:31:29,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=826, Unknown=0, NotChecked=0, Total=930 [2021-05-02 23:31:29,871 INFO L87 Difference]: Start difference. First operand 50 states and 62 transitions. Second operand has 30 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 28 states have internal predecessors, (31), 2 states have call successors, (3), 3 states 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 23:31:32,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:32,775 INFO L93 Difference]: Finished difference Result 104 states and 129 transitions. [2021-05-02 23:31:32,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 23:31:32,775 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 28 states have internal predecessors, (31), 2 states have call successors, (3), 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 35 [2021-05-02 23:31:32,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:32,776 INFO L225 Difference]: With dead ends: 104 [2021-05-02 23:31:32,776 INFO L226 Difference]: Without dead ends: 102 [2021-05-02 23:31:32,778 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1379 ImplicationChecksByTransitivity, 2619.0ms TimeCoverageRelationStatistics Valid=582, Invalid=5898, Unknown=0, NotChecked=0, Total=6480 [2021-05-02 23:31:32,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-05-02 23:31:32,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 52. [2021-05-02 23:31:32,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 43 states have (on average 1.3255813953488371) internal successors, (57), 44 states have internal predecessors, (57), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:31:32,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 66 transitions. [2021-05-02 23:31:32,785 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 66 transitions. Word has length 35 [2021-05-02 23:31:32,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:32,786 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 66 transitions. [2021-05-02 23:31:32,786 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 28 states have internal predecessors, (31), 2 states have call successors, (3), 3 states 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 23:31:32,786 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 66 transitions. [2021-05-02 23:31:32,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 23:31:32,786 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:32,786 INFO L523 BasicCegarLoop]: trace histogram [11, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:32,786 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-05-02 23:31:32,786 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:32,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:32,787 INFO L82 PathProgramCache]: Analyzing trace with hash 1001473606, now seen corresponding path program 6 times [2021-05-02 23:31:32,787 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:32,787 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [331568681] [2021-05-02 23:31:32,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:32,792 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_201 v_main_~n~0_26) InVars {main_~i~0=v_main_~i~0_201, main_~n~0=v_main_~n~0_26} OutVars{main_~i~0=v_main_~i~0_201, main_~n~0=v_main_~n~0_26} AuxVars[] AssignedVars[] [2021-05-02 23:31:32,794 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:31:32,803 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:32,808 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:31:32,826 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:31:32,840 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:32,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:33,051 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:33,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:33,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:31:33,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:33,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:31:33,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:33,066 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:31:33,351 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:33,351 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [331568681] [2021-05-02 23:31:33,351 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [331568681] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:33,351 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:33,351 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-02 23:31:33,351 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632725912] [2021-05-02 23:31:33,352 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 23:31:33,352 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:33,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 23:31:33,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=479, Unknown=0, NotChecked=0, Total=552 [2021-05-02 23:31:33,352 INFO L87 Difference]: Start difference. First operand 52 states and 66 transitions. Second operand has 23 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 21 states have internal predecessors, (28), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:31:34,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:34,263 INFO L93 Difference]: Finished difference Result 76 states and 92 transitions. [2021-05-02 23:31:34,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 23:31:34,264 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 21 states have internal predecessors, (28), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 39 [2021-05-02 23:31:34,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:34,264 INFO L225 Difference]: With dead ends: 76 [2021-05-02 23:31:34,264 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 23:31:34,265 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 393 ImplicationChecksByTransitivity, 1092.2ms TimeCoverageRelationStatistics Valid=225, Invalid=1755, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 23:31:34,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 23:31:34,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-05-02 23:31:34,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 44 states have internal predecessors, (55), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:31:34,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 64 transitions. [2021-05-02 23:31:34,272 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 64 transitions. Word has length 39 [2021-05-02 23:31:34,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:34,272 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 64 transitions. [2021-05-02 23:31:34,272 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 21 states have internal predecessors, (28), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:31:34,272 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 64 transitions. [2021-05-02 23:31:34,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 23:31:34,272 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:34,273 INFO L523 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:34,273 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-02 23:31:34,273 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:34,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:34,273 INFO L82 PathProgramCache]: Analyzing trace with hash -1541915226, now seen corresponding path program 12 times [2021-05-02 23:31:34,273 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:34,273 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [259939500] [2021-05-02 23:31:34,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:34,278 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_215 v_main_~n~0_27) InVars {main_~i~0=v_main_~i~0_215, main_~n~0=v_main_~n~0_27} OutVars{main_~i~0=v_main_~i~0_215, main_~n~0=v_main_~n~0_27} AuxVars[] AssignedVars[] [2021-05-02 23:31:34,279 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:31:34,281 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:34,286 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:31:34,304 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:31:34,317 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:34,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:34,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:34,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:34,393 INFO 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 23:31:35,021 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:35,022 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [259939500] [2021-05-02 23:31:35,022 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [259939500] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:35,022 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:35,022 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-02 23:31:35,022 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750814097] [2021-05-02 23:31:35,022 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 23:31:35,022 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:35,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 23:31:35,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 23:31:35,023 INFO L87 Difference]: Start difference. First operand 52 states and 64 transitions. Second operand has 32 states, 31 states have (on average 1.064516129032258) internal successors, (33), 30 states have internal predecessors, (33), 2 states have call successors, (3), 3 states 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 23:31:38,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:38,384 INFO L93 Difference]: Finished difference Result 106 states and 131 transitions. [2021-05-02 23:31:38,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 23:31:38,385 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 1.064516129032258) internal successors, (33), 30 states have internal predecessors, (33), 2 states have call successors, (3), 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 37 [2021-05-02 23:31:38,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:38,386 INFO L225 Difference]: With dead ends: 106 [2021-05-02 23:31:38,386 INFO L226 Difference]: Without dead ends: 104 [2021-05-02 23:31:38,387 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1532 ImplicationChecksByTransitivity, 3015.9ms TimeCoverageRelationStatistics Valid=683, Invalid=6627, Unknown=0, NotChecked=0, Total=7310 [2021-05-02 23:31:38,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-05-02 23:31:38,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 54. [2021-05-02 23:31:38,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 45 states have (on average 1.3111111111111111) internal successors, (59), 46 states have internal predecessors, (59), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:31:38,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 68 transitions. [2021-05-02 23:31:38,408 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 68 transitions. Word has length 37 [2021-05-02 23:31:38,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:38,408 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 68 transitions. [2021-05-02 23:31:38,408 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 31 states have (on average 1.064516129032258) internal successors, (33), 30 states have internal predecessors, (33), 2 states have call successors, (3), 3 states 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 23:31:38,408 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 68 transitions. [2021-05-02 23:31:38,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 23:31:38,408 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:38,408 INFO L523 BasicCegarLoop]: trace histogram [13, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:38,408 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-05-02 23:31:38,408 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:38,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:38,409 INFO L82 PathProgramCache]: Analyzing trace with hash 468402118, now seen corresponding path program 7 times [2021-05-02 23:31:38,409 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:38,409 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1235571757] [2021-05-02 23:31:38,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:38,422 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_241 v_main_~n~0_28) InVars {main_~i~0=v_main_~i~0_241, main_~n~0=v_main_~n~0_28} OutVars{main_~i~0=v_main_~i~0_241, main_~n~0=v_main_~n~0_28} AuxVars[] AssignedVars[] [2021-05-02 23:31:38,426 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:31:38,426 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:38,431 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:31:38,469 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:31:38,483 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:38,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:38,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:38,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:38,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:31:38,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:38,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:31:38,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:38,733 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:31:39,117 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:39,118 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1235571757] [2021-05-02 23:31:39,118 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1235571757] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:39,118 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:39,118 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-02 23:31:39,118 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956881917] [2021-05-02 23:31:39,118 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 23:31:39,118 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:39,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 23:31:39,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=602, Unknown=0, NotChecked=0, Total=702 [2021-05-02 23:31:39,119 INFO L87 Difference]: Start difference. First operand 54 states and 68 transitions. Second operand has 25 states, 24 states have (on average 1.25) internal successors, (30), 23 states have internal predecessors, (30), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:31:40,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:40,334 INFO L93 Difference]: Finished difference Result 78 states and 94 transitions. [2021-05-02 23:31:40,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 23:31:40,335 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.25) internal successors, (30), 23 states have internal predecessors, (30), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 41 [2021-05-02 23:31:40,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:40,335 INFO L225 Difference]: With dead ends: 78 [2021-05-02 23:31:40,335 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 23:31:40,336 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 495 ImplicationChecksByTransitivity, 1440.6ms TimeCoverageRelationStatistics Valid=284, Invalid=2166, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 23:31:40,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 23:31:40,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-05-02 23:31:40,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 45 states have (on average 1.2666666666666666) internal successors, (57), 46 states have internal predecessors, (57), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:31:40,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 66 transitions. [2021-05-02 23:31:40,343 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 66 transitions. Word has length 41 [2021-05-02 23:31:40,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:40,343 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 66 transitions. [2021-05-02 23:31:40,343 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 24 states have (on average 1.25) internal successors, (30), 23 states have internal predecessors, (30), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:31:40,343 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 66 transitions. [2021-05-02 23:31:40,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 23:31:40,343 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:40,343 INFO L523 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:40,343 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-05-02 23:31:40,343 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:40,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:40,344 INFO L82 PathProgramCache]: Analyzing trace with hash 897750822, now seen corresponding path program 13 times [2021-05-02 23:31:40,344 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:40,344 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1725502644] [2021-05-02 23:31:40,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:40,360 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_257 v_main_~n~0_29) InVars {main_~i~0=v_main_~i~0_257, main_~n~0=v_main_~n~0_29} OutVars{main_~i~0=v_main_~i~0_257, main_~n~0=v_main_~n~0_29} AuxVars[] AssignedVars[] [2021-05-02 23:31:40,361 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:31:40,372 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:40,378 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:31:40,388 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:31:40,404 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:40,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:40,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:40,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:40,505 INFO 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 23:31:41,229 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:41,229 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1725502644] [2021-05-02 23:31:41,229 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1725502644] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:41,229 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:41,229 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-02 23:31:41,229 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1736884681] [2021-05-02 23:31:41,230 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 23:31:41,230 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:41,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 23:31:41,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1070, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 23:31:41,230 INFO L87 Difference]: Start difference. First operand 54 states and 66 transitions. Second operand has 34 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 32 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:31:44,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:44,982 INFO L93 Difference]: Finished difference Result 108 states and 133 transitions. [2021-05-02 23:31:44,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-02 23:31:44,983 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 32 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2021-05-02 23:31:44,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:44,983 INFO L225 Difference]: With dead ends: 108 [2021-05-02 23:31:44,983 INFO L226 Difference]: Without dead ends: 106 [2021-05-02 23:31:44,984 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1617 ImplicationChecksByTransitivity, 3171.6ms TimeCoverageRelationStatistics Valid=630, Invalid=7202, Unknown=0, NotChecked=0, Total=7832 [2021-05-02 23:31:44,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-05-02 23:31:44,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 56. [2021-05-02 23:31:44,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 47 states have (on average 1.297872340425532) internal successors, (61), 48 states have internal predecessors, (61), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:31:44,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 70 transitions. [2021-05-02 23:31:44,993 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 70 transitions. Word has length 39 [2021-05-02 23:31:44,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:44,993 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 70 transitions. [2021-05-02 23:31:44,993 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 32 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:31:44,993 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 70 transitions. [2021-05-02 23:31:44,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 23:31:44,994 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:44,994 INFO L523 BasicCegarLoop]: trace histogram [15, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:44,994 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-05-02 23:31:44,994 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:44,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:44,994 INFO L82 PathProgramCache]: Analyzing trace with hash -712189626, now seen corresponding path program 8 times [2021-05-02 23:31:44,994 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:44,994 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [984079967] [2021-05-02 23:31:44,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:44,998 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_285 v_main_~n~0_30) InVars {main_~i~0=v_main_~i~0_285, main_~n~0=v_main_~n~0_30} OutVars{main_~i~0=v_main_~i~0_285, main_~n~0=v_main_~n~0_30} AuxVars[] AssignedVars[] [2021-05-02 23:31:44,999 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:31:45,002 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:45,009 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:31:45,027 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:31:45,041 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:45,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:45,273 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:45,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:45,289 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:31:45,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:45,292 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:31:45,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:45,296 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:31:45,685 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:45,685 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [984079967] [2021-05-02 23:31:45,685 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [984079967] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:45,685 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:45,685 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-02 23:31:45,685 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433019653] [2021-05-02 23:31:45,686 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 23:31:45,686 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:45,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 23:31:45,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=667, Unknown=0, NotChecked=0, Total=756 [2021-05-02 23:31:45,686 INFO L87 Difference]: Start difference. First operand 56 states and 70 transitions. Second operand has 27 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 25 states have internal predecessors, (32), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:31:46,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:46,802 INFO L93 Difference]: Finished difference Result 80 states and 96 transitions. [2021-05-02 23:31:46,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 23:31:46,803 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 25 states have internal predecessors, (32), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 43 [2021-05-02 23:31:46,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:46,803 INFO L225 Difference]: With dead ends: 80 [2021-05-02 23:31:46,803 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 23:31:46,804 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 535 ImplicationChecksByTransitivity, 1358.1ms TimeCoverageRelationStatistics Valid=269, Invalid=2487, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 23:31:46,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 23:31:46,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-05-02 23:31:46,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 47 states have (on average 1.2553191489361701) internal successors, (59), 48 states have internal predecessors, (59), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:31:46,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 68 transitions. [2021-05-02 23:31:46,811 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 68 transitions. Word has length 43 [2021-05-02 23:31:46,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:46,812 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 68 transitions. [2021-05-02 23:31:46,812 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 25 states have internal predecessors, (32), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:31:46,812 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 68 transitions. [2021-05-02 23:31:46,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 23:31:46,812 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:46,812 INFO L523 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:46,812 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-05-02 23:31:46,812 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:46,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:46,812 INFO L82 PathProgramCache]: Analyzing trace with hash 364679334, now seen corresponding path program 14 times [2021-05-02 23:31:46,813 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:46,813 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1532297999] [2021-05-02 23:31:46,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:46,817 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_303 v_main_~n~0_31) InVars {main_~i~0=v_main_~i~0_303, main_~n~0=v_main_~n~0_31} OutVars{main_~i~0=v_main_~i~0_303, main_~n~0=v_main_~n~0_31} AuxVars[] AssignedVars[] [2021-05-02 23:31:46,818 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:31:46,829 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:46,834 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:31:46,844 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:31:46,858 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:46,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:46,912 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:46,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:46,929 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:31:47,676 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:47,676 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1532297999] [2021-05-02 23:31:47,676 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1532297999] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:47,676 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:47,676 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-02 23:31:47,676 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743306611] [2021-05-02 23:31:47,676 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 23:31:47,677 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:47,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 23:31:47,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1204, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 23:31:47,677 INFO L87 Difference]: Start difference. First operand 56 states and 68 transitions. Second operand has 36 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 34 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:31:51,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:51,456 INFO L93 Difference]: Finished difference Result 110 states and 135 transitions. [2021-05-02 23:31:51,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-02 23:31:51,456 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 34 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-02 23:31:51,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:51,457 INFO L225 Difference]: With dead ends: 110 [2021-05-02 23:31:51,457 INFO L226 Difference]: Without dead ends: 108 [2021-05-02 23:31:51,457 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1742 ImplicationChecksByTransitivity, 3282.7ms TimeCoverageRelationStatistics Valid=654, Invalid=7902, Unknown=0, NotChecked=0, Total=8556 [2021-05-02 23:31:51,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-02 23:31:51,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 58. [2021-05-02 23:31:51,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 49 states have (on average 1.2857142857142858) internal successors, (63), 50 states have internal predecessors, (63), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:31:51,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 72 transitions. [2021-05-02 23:31:51,466 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 72 transitions. Word has length 41 [2021-05-02 23:31:51,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:51,466 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 72 transitions. [2021-05-02 23:31:51,466 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 34 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:31:51,466 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 72 transitions. [2021-05-02 23:31:51,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 23:31:51,466 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:51,467 INFO L523 BasicCegarLoop]: trace histogram [17, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:51,467 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-05-02 23:31:51,467 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:51,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:51,467 INFO L82 PathProgramCache]: Analyzing trace with hash -1389489466, now seen corresponding path program 9 times [2021-05-02 23:31:51,467 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:51,467 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1765144945] [2021-05-02 23:31:51,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:51,470 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_333 v_main_~n~0_32) InVars {main_~i~0=v_main_~i~0_333, main_~n~0=v_main_~n~0_32} OutVars{main_~i~0=v_main_~i~0_333, main_~n~0=v_main_~n~0_32} AuxVars[] AssignedVars[] [2021-05-02 23:31:51,472 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:31:51,472 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:51,477 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:31:51,495 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:31:51,509 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:51,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:51,714 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:51,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:51,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:31:51,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:51,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:31:51,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:51,721 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:31:52,189 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:52,190 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1765144945] [2021-05-02 23:31:52,190 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1765144945] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:52,190 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:52,190 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-02 23:31:52,190 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531293689] [2021-05-02 23:31:52,190 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 23:31:52,190 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:52,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 23:31:52,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=810, Unknown=0, NotChecked=0, Total=930 [2021-05-02 23:31:52,191 INFO L87 Difference]: Start difference. First operand 58 states and 72 transitions. Second operand has 29 states, 28 states have (on average 1.2142857142857142) internal successors, (34), 27 states have internal predecessors, (34), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:31:53,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:53,490 INFO L93 Difference]: Finished difference Result 82 states and 98 transitions. [2021-05-02 23:31:53,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 23:31:53,490 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 1.2142857142857142) internal successors, (34), 27 states have internal predecessors, (34), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 45 [2021-05-02 23:31:53,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:53,491 INFO L225 Difference]: With dead ends: 82 [2021-05-02 23:31:53,491 INFO L226 Difference]: Without dead ends: 58 [2021-05-02 23:31:53,491 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 649 ImplicationChecksByTransitivity, 1492.4ms TimeCoverageRelationStatistics Valid=336, Invalid=2970, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 23:31:53,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-02 23:31:53,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2021-05-02 23:31:53,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 49 states have (on average 1.2448979591836735) internal successors, (61), 50 states have internal predecessors, (61), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:31:53,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 70 transitions. [2021-05-02 23:31:53,499 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 70 transitions. Word has length 45 [2021-05-02 23:31:53,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:53,499 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 70 transitions. [2021-05-02 23:31:53,499 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 28 states have (on average 1.2142857142857142) internal successors, (34), 27 states have internal predecessors, (34), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:31:53,499 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 70 transitions. [2021-05-02 23:31:53,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 23:31:53,500 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:53,500 INFO L523 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:53,500 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-05-02 23:31:53,500 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:53,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:53,500 INFO L82 PathProgramCache]: Analyzing trace with hash -815912410, now seen corresponding path program 15 times [2021-05-02 23:31:53,500 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:53,500 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1416225463] [2021-05-02 23:31:53,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:53,506 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_353 v_main_~n~0_33) InVars {main_~i~0=v_main_~i~0_353, main_~n~0=v_main_~n~0_33} OutVars{main_~i~0=v_main_~i~0_353, main_~n~0=v_main_~n~0_33} AuxVars[] AssignedVars[] [2021-05-02 23:31:53,507 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:31:53,508 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:53,513 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:31:53,532 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:31:53,546 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:53,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:53,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:53,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:53,604 INFO 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 23:31:54,441 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:54,441 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1416225463] [2021-05-02 23:31:54,442 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1416225463] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:54,442 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:54,442 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-02 23:31:54,442 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960109412] [2021-05-02 23:31:54,442 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 23:31:54,442 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:54,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 23:31:54,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=1346, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 23:31:54,443 INFO L87 Difference]: Start difference. First operand 58 states and 70 transitions. Second operand has 38 states, 37 states have (on average 1.054054054054054) internal successors, (39), 36 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:31:58,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:31:58,411 INFO L93 Difference]: Finished difference Result 112 states and 137 transitions. [2021-05-02 23:31:58,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-02 23:31:58,412 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 1.054054054054054) internal successors, (39), 36 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2021-05-02 23:31:58,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:31:58,412 INFO L225 Difference]: With dead ends: 112 [2021-05-02 23:31:58,412 INFO L226 Difference]: Without dead ends: 110 [2021-05-02 23:31:58,413 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1871 ImplicationChecksByTransitivity, 3508.1ms TimeCoverageRelationStatistics Valid=678, Invalid=8634, Unknown=0, NotChecked=0, Total=9312 [2021-05-02 23:31:58,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-02 23:31:58,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 60. [2021-05-02 23:31:58,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 51 states have (on average 1.2745098039215685) internal successors, (65), 52 states have internal predecessors, (65), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:31:58,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 74 transitions. [2021-05-02 23:31:58,423 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 74 transitions. Word has length 43 [2021-05-02 23:31:58,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:31:58,423 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 74 transitions. [2021-05-02 23:31:58,423 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 37 states have (on average 1.054054054054054) internal successors, (39), 36 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:31:58,423 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 74 transitions. [2021-05-02 23:31:58,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 23:31:58,423 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:31:58,423 INFO L523 BasicCegarLoop]: trace histogram [19, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:31:58,423 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-05-02 23:31:58,423 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:31:58,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:31:58,424 INFO L82 PathProgramCache]: Analyzing trace with hash 560393286, now seen corresponding path program 10 times [2021-05-02 23:31:58,424 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:31:58,424 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1927185454] [2021-05-02 23:31:58,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:31:58,432 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_385 v_main_~n~0_34) InVars {main_~i~0=v_main_~i~0_385, main_~n~0=v_main_~n~0_34} OutVars{main_~i~0=v_main_~i~0_385, main_~n~0=v_main_~n~0_34} AuxVars[] AssignedVars[] [2021-05-02 23:31:58,433 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:31:58,442 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:31:58,447 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:31:58,457 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:31:58,471 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:31:58,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:58,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:31:58,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:58,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:31:58,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:58,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:31:58,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:31:58,674 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:31:59,220 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:31:59,220 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1927185454] [2021-05-02 23:31:59,220 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1927185454] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:31:59,220 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:31:59,220 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-02 23:31:59,220 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1367775957] [2021-05-02 23:31:59,220 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 23:31:59,220 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:31:59,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 23:31:59,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=926, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 23:31:59,221 INFO L87 Difference]: Start difference. First operand 60 states and 74 transitions. Second operand has 31 states, 30 states have (on average 1.2) internal successors, (36), 29 states have internal predecessors, (36), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:32:00,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:00,635 INFO L93 Difference]: Finished difference Result 84 states and 100 transitions. [2021-05-02 23:32:00,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 23:32:00,636 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 1.2) internal successors, (36), 29 states have internal predecessors, (36), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 47 [2021-05-02 23:32:00,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:00,636 INFO L225 Difference]: With dead ends: 84 [2021-05-02 23:32:00,636 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 23:32:00,637 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 732 ImplicationChecksByTransitivity, 1671.9ms TimeCoverageRelationStatistics Valid=362, Invalid=3420, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 23:32:00,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 23:32:00,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-05-02 23:32:00,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 51 states have (on average 1.2352941176470589) internal successors, (63), 52 states have internal predecessors, (63), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:32:00,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2021-05-02 23:32:00,645 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 47 [2021-05-02 23:32:00,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:00,645 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2021-05-02 23:32:00,645 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 30 states have (on average 1.2) internal successors, (36), 29 states have internal predecessors, (36), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:32:00,646 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2021-05-02 23:32:00,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 23:32:00,646 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:00,646 INFO L523 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:00,646 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-05-02 23:32:00,646 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:00,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:00,646 INFO L82 PathProgramCache]: Analyzing trace with hash -1493212250, now seen corresponding path program 16 times [2021-05-02 23:32:00,646 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:00,646 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2041880842] [2021-05-02 23:32:00,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:00,651 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_407 v_main_~n~0_35) InVars {main_~i~0=v_main_~i~0_407, main_~n~0=v_main_~n~0_35} OutVars{main_~i~0=v_main_~i~0_407, main_~n~0=v_main_~n~0_35} AuxVars[] AssignedVars[] [2021-05-02 23:32:00,652 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:32:00,662 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:00,667 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:32:00,676 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:32:00,691 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:00,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:00,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:00,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:00,767 INFO 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 23:32:01,730 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:01,730 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2041880842] [2021-05-02 23:32:01,730 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2041880842] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:01,730 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:01,730 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-02 23:32:01,731 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593157252] [2021-05-02 23:32:01,731 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-02 23:32:01,731 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:01,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-02 23:32:01,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=1496, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 23:32:01,731 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 40 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 38 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:32:05,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:05,909 INFO L93 Difference]: Finished difference Result 114 states and 139 transitions. [2021-05-02 23:32:05,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-02 23:32:05,910 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 38 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2021-05-02 23:32:05,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:05,910 INFO L225 Difference]: With dead ends: 114 [2021-05-02 23:32:05,910 INFO L226 Difference]: Without dead ends: 112 [2021-05-02 23:32:05,912 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2004 ImplicationChecksByTransitivity, 3827.0ms TimeCoverageRelationStatistics Valid=702, Invalid=9398, Unknown=0, NotChecked=0, Total=10100 [2021-05-02 23:32:05,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-05-02 23:32:05,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 62. [2021-05-02 23:32:05,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 53 states have (on average 1.2641509433962264) internal successors, (67), 54 states have internal predecessors, (67), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:32:05,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 76 transitions. [2021-05-02 23:32:05,921 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 76 transitions. Word has length 45 [2021-05-02 23:32:05,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:05,921 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 76 transitions. [2021-05-02 23:32:05,921 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 38 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:32:05,922 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 76 transitions. [2021-05-02 23:32:05,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 23:32:05,922 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:05,922 INFO L523 BasicCegarLoop]: trace histogram [21, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:05,922 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-05-02 23:32:05,922 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:05,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:05,922 INFO L82 PathProgramCache]: Analyzing trace with hash 1791976902, now seen corresponding path program 11 times [2021-05-02 23:32:05,922 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:05,923 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1522106882] [2021-05-02 23:32:05,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:05,927 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_441 v_main_~n~0_36) InVars {main_~i~0=v_main_~i~0_441, main_~n~0=v_main_~n~0_36} OutVars{main_~i~0=v_main_~i~0_441, main_~n~0=v_main_~n~0_36} AuxVars[] AssignedVars[] [2021-05-02 23:32:05,929 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:32:05,937 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:05,943 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:32:05,953 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:32:05,968 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:05,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:06,172 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:06,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:06,176 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:32:06,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:06,178 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:32:06,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:06,181 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:32:06,805 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:06,805 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1522106882] [2021-05-02 23:32:06,805 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1522106882] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:06,806 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:06,806 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-02 23:32:06,806 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757779312] [2021-05-02 23:32:06,806 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 23:32:06,806 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:06,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 23:32:06,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1050, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 23:32:06,807 INFO L87 Difference]: Start difference. First operand 62 states and 76 transitions. Second operand has 33 states, 32 states have (on average 1.1875) internal successors, (38), 31 states have internal predecessors, (38), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:32:08,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:08,468 INFO L93 Difference]: Finished difference Result 86 states and 102 transitions. [2021-05-02 23:32:08,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 23:32:08,468 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 1.1875) internal successors, (38), 31 states have internal predecessors, (38), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 49 [2021-05-02 23:32:08,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:08,469 INFO L225 Difference]: With dead ends: 86 [2021-05-02 23:32:08,469 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 23:32:08,469 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 819 ImplicationChecksByTransitivity, 1872.7ms TimeCoverageRelationStatistics Valid=388, Invalid=3902, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 23:32:08,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 23:32:08,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2021-05-02 23:32:08,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 53 states have (on average 1.2264150943396226) internal successors, (65), 54 states have internal predecessors, (65), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:32:08,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 74 transitions. [2021-05-02 23:32:08,478 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 74 transitions. Word has length 49 [2021-05-02 23:32:08,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:08,479 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 74 transitions. [2021-05-02 23:32:08,479 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 32 states have (on average 1.1875) internal successors, (38), 31 states have internal predecessors, (38), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:32:08,479 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 74 transitions. [2021-05-02 23:32:08,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 23:32:08,479 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:08,479 INFO L523 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:08,479 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-05-02 23:32:08,479 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:08,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:08,479 INFO L82 PathProgramCache]: Analyzing trace with hash 456670502, now seen corresponding path program 17 times [2021-05-02 23:32:08,480 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:08,480 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1132591415] [2021-05-02 23:32:08,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:08,483 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_465 v_main_~n~0_37) InVars {main_~i~0=v_main_~i~0_465, main_~n~0=v_main_~n~0_37} OutVars{main_~i~0=v_main_~i~0_465, main_~n~0=v_main_~n~0_37} AuxVars[] AssignedVars[] [2021-05-02 23:32:08,484 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:32:08,485 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:08,490 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:32:08,512 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:32:08,528 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:08,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:08,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:08,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:08,613 INFO 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 23:32:09,706 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:09,706 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1132591415] [2021-05-02 23:32:09,706 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1132591415] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:09,706 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:09,706 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-02 23:32:09,706 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1031054415] [2021-05-02 23:32:09,706 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 23:32:09,706 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:09,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 23:32:09,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=1654, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 23:32:09,707 INFO L87 Difference]: Start difference. First operand 62 states and 74 transitions. Second operand has 42 states, 41 states have (on average 1.048780487804878) internal successors, (43), 40 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:32:14,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:14,470 INFO L93 Difference]: Finished difference Result 116 states and 141 transitions. [2021-05-02 23:32:14,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-05-02 23:32:14,471 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 41 states have (on average 1.048780487804878) internal successors, (43), 40 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-05-02 23:32:14,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:14,471 INFO L225 Difference]: With dead ends: 116 [2021-05-02 23:32:14,472 INFO L226 Difference]: Without dead ends: 114 [2021-05-02 23:32:14,472 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2141 ImplicationChecksByTransitivity, 4108.1ms TimeCoverageRelationStatistics Valid=726, Invalid=10194, Unknown=0, NotChecked=0, Total=10920 [2021-05-02 23:32:14,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-05-02 23:32:14,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 64. [2021-05-02 23:32:14,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 55 states have (on average 1.2545454545454546) internal successors, (69), 56 states have internal predecessors, (69), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:32:14,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 78 transitions. [2021-05-02 23:32:14,482 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 78 transitions. Word has length 47 [2021-05-02 23:32:14,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:14,482 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 78 transitions. [2021-05-02 23:32:14,482 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 41 states have (on average 1.048780487804878) internal successors, (43), 40 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:32:14,482 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 78 transitions. [2021-05-02 23:32:14,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 23:32:14,483 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:14,483 INFO L523 BasicCegarLoop]: trace histogram [23, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:14,483 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-05-02 23:32:14,483 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:14,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:14,483 INFO L82 PathProgramCache]: Analyzing trace with hash -67141818, now seen corresponding path program 12 times [2021-05-02 23:32:14,483 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:14,483 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [184786545] [2021-05-02 23:32:14,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:14,486 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_501 v_main_~n~0_38) InVars {main_~i~0=v_main_~i~0_501, main_~n~0=v_main_~n~0_38} OutVars{main_~i~0=v_main_~i~0_501, main_~n~0=v_main_~n~0_38} AuxVars[] AssignedVars[] [2021-05-02 23:32:14,488 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:32:14,488 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:14,494 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:32:14,514 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:32:14,529 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:14,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:14,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:14,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:14,767 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:32:14,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:14,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:32:14,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:14,773 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:32:15,480 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:15,480 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [184786545] [2021-05-02 23:32:15,480 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [184786545] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:15,480 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:15,480 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-02 23:32:15,480 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130479542] [2021-05-02 23:32:15,480 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 23:32:15,480 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:15,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 23:32:15,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=1182, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 23:32:15,481 INFO L87 Difference]: Start difference. First operand 64 states and 78 transitions. Second operand has 35 states, 34 states have (on average 1.1764705882352942) internal successors, (40), 33 states have internal predecessors, (40), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:32:17,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:17,207 INFO L93 Difference]: Finished difference Result 88 states and 104 transitions. [2021-05-02 23:32:17,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 23:32:17,207 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.1764705882352942) internal successors, (40), 33 states have internal predecessors, (40), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 51 [2021-05-02 23:32:17,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:17,208 INFO L225 Difference]: With dead ends: 88 [2021-05-02 23:32:17,208 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 23:32:17,208 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 910 ImplicationChecksByTransitivity, 2062.5ms TimeCoverageRelationStatistics Valid=414, Invalid=4416, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 23:32:17,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 23:32:17,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-05-02 23:32:17,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 55 states have (on average 1.2181818181818183) internal successors, (67), 56 states have internal predecessors, (67), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:32:17,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 76 transitions. [2021-05-02 23:32:17,218 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 76 transitions. Word has length 51 [2021-05-02 23:32:17,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:17,218 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 76 transitions. [2021-05-02 23:32:17,218 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 34 states have (on average 1.1764705882352942) internal successors, (40), 33 states have internal predecessors, (40), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:32:17,218 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 76 transitions. [2021-05-02 23:32:17,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 23:32:17,218 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:17,218 INFO L523 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:17,218 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-05-02 23:32:17,218 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:17,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:17,219 INFO L82 PathProgramCache]: Analyzing trace with hash 1688254118, now seen corresponding path program 18 times [2021-05-02 23:32:17,219 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:17,219 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2109437110] [2021-05-02 23:32:17,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:17,222 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_527 v_main_~n~0_39) InVars {main_~i~0=v_main_~i~0_527, main_~n~0=v_main_~n~0_39} OutVars{main_~i~0=v_main_~i~0_527, main_~n~0=v_main_~n~0_39} AuxVars[] AssignedVars[] [2021-05-02 23:32:17,224 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:32:17,238 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:17,243 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:32:17,253 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:32:17,269 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:17,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:17,356 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:17,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:17,365 INFO 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 23:32:18,545 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:18,545 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2109437110] [2021-05-02 23:32:18,545 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2109437110] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:18,545 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:18,545 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-02 23:32:18,545 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686880528] [2021-05-02 23:32:18,546 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 23:32:18,546 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:18,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 23:32:18,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=1820, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 23:32:18,546 INFO L87 Difference]: Start difference. First operand 64 states and 76 transitions. Second operand has 44 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 42 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:32:23,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:23,638 INFO L93 Difference]: Finished difference Result 118 states and 143 transitions. [2021-05-02 23:32:23,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-05-02 23:32:23,639 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 42 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-05-02 23:32:23,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:23,640 INFO L225 Difference]: With dead ends: 118 [2021-05-02 23:32:23,640 INFO L226 Difference]: Without dead ends: 116 [2021-05-02 23:32:23,640 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2282 ImplicationChecksByTransitivity, 4496.8ms TimeCoverageRelationStatistics Valid=750, Invalid=11022, Unknown=0, NotChecked=0, Total=11772 [2021-05-02 23:32:23,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-05-02 23:32:23,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 66. [2021-05-02 23:32:23,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 57 states have (on average 1.2456140350877194) internal successors, (71), 58 states have internal predecessors, (71), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:32:23,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 80 transitions. [2021-05-02 23:32:23,650 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 80 transitions. Word has length 49 [2021-05-02 23:32:23,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:23,650 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 80 transitions. [2021-05-02 23:32:23,651 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 42 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:32:23,651 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 80 transitions. [2021-05-02 23:32:23,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 23:32:23,651 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:23,651 INFO L523 BasicCegarLoop]: trace histogram [25, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:23,651 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-05-02 23:32:23,651 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:23,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:23,651 INFO L82 PathProgramCache]: Analyzing trace with hash 26163398, now seen corresponding path program 13 times [2021-05-02 23:32:23,651 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:23,652 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1397256496] [2021-05-02 23:32:23,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:23,660 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_565 v_main_~n~0_40) InVars {main_~i~0=v_main_~i~0_565, main_~n~0=v_main_~n~0_40} OutVars{main_~i~0=v_main_~i~0_565, main_~n~0=v_main_~n~0_40} AuxVars[] AssignedVars[] [2021-05-02 23:32:23,662 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:32:23,671 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:23,677 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:32:23,687 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:32:23,703 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:23,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:23,952 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:23,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:23,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:32:23,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:23,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:32:23,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:23,968 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:32:24,810 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:24,810 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1397256496] [2021-05-02 23:32:24,811 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1397256496] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:24,811 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:24,811 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-02 23:32:24,811 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196278802] [2021-05-02 23:32:24,811 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 23:32:24,811 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:24,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 23:32:24,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1277, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 23:32:24,812 INFO L87 Difference]: Start difference. First operand 66 states and 80 transitions. Second operand has 37 states, 36 states have (on average 1.1666666666666667) internal successors, (42), 35 states have internal predecessors, (42), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:32:26,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:26,797 INFO L93 Difference]: Finished difference Result 90 states and 106 transitions. [2021-05-02 23:32:26,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 23:32:26,798 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 1.1666666666666667) internal successors, (42), 35 states have internal predecessors, (42), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 53 [2021-05-02 23:32:26,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:26,798 INFO L225 Difference]: With dead ends: 90 [2021-05-02 23:32:26,798 INFO L226 Difference]: Without dead ends: 66 [2021-05-02 23:32:26,799 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 960 ImplicationChecksByTransitivity, 2351.5ms TimeCoverageRelationStatistics Valid=379, Invalid=4877, Unknown=0, NotChecked=0, Total=5256 [2021-05-02 23:32:26,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-02 23:32:26,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2021-05-02 23:32:26,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 57 states have (on average 1.2105263157894737) internal successors, (69), 58 states have internal predecessors, (69), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:32:26,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 78 transitions. [2021-05-02 23:32:26,809 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 78 transitions. Word has length 53 [2021-05-02 23:32:26,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:26,809 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 78 transitions. [2021-05-02 23:32:26,809 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 36 states have (on average 1.1666666666666667) internal successors, (42), 35 states have internal predecessors, (42), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:32:26,809 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 78 transitions. [2021-05-02 23:32:26,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 23:32:26,809 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:26,809 INFO L523 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:26,810 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-05-02 23:32:26,810 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:26,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:26,810 INFO L82 PathProgramCache]: Analyzing trace with hash -170864602, now seen corresponding path program 19 times [2021-05-02 23:32:26,810 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:26,810 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1718404691] [2021-05-02 23:32:26,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:26,814 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_593 v_main_~n~0_41) InVars {main_~i~0=v_main_~i~0_593, main_~n~0=v_main_~n~0_41} OutVars{main_~i~0=v_main_~i~0_593, main_~n~0=v_main_~n~0_41} AuxVars[] AssignedVars[] [2021-05-02 23:32:26,816 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:32:26,817 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:26,822 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:32:26,845 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:32:26,863 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:26,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:26,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:26,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:26,937 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:28,279 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:28,279 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1718404691] [2021-05-02 23:32:28,279 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1718404691] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:28,279 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:28,279 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2021-05-02 23:32:28,279 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517330703] [2021-05-02 23:32:28,279 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 23:32:28,279 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:28,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 23:32:28,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=1994, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 23:32:28,280 INFO L87 Difference]: Start difference. First operand 66 states and 78 transitions. Second operand has 46 states, 45 states have (on average 1.0444444444444445) internal successors, (47), 44 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:32:34,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:34,066 INFO L93 Difference]: Finished difference Result 120 states and 145 transitions. [2021-05-02 23:32:34,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-05-02 23:32:34,067 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 1.0444444444444445) internal successors, (47), 44 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-02 23:32:34,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:34,068 INFO L225 Difference]: With dead ends: 120 [2021-05-02 23:32:34,068 INFO L226 Difference]: Without dead ends: 118 [2021-05-02 23:32:34,068 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2427 ImplicationChecksByTransitivity, 4888.4ms TimeCoverageRelationStatistics Valid=774, Invalid=11882, Unknown=0, NotChecked=0, Total=12656 [2021-05-02 23:32:34,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-05-02 23:32:34,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 68. [2021-05-02 23:32:34,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 59 states have (on average 1.2372881355932204) internal successors, (73), 60 states have internal predecessors, (73), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:32:34,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 82 transitions. [2021-05-02 23:32:34,079 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 82 transitions. Word has length 51 [2021-05-02 23:32:34,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:34,079 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 82 transitions. [2021-05-02 23:32:34,080 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 45 states have (on average 1.0444444444444445) internal successors, (47), 44 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:32:34,080 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 82 transitions. [2021-05-02 23:32:34,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 23:32:34,080 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:34,080 INFO L523 BasicCegarLoop]: trace histogram [27, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:34,080 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-05-02 23:32:34,080 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:34,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:34,080 INFO L82 PathProgramCache]: Analyzing trace with hash -501837242, now seen corresponding path program 14 times [2021-05-02 23:32:34,080 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:34,080 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [172618224] [2021-05-02 23:32:34,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:34,084 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_633 v_main_~n~0_42) InVars {main_~i~0=v_main_~i~0_633, main_~n~0=v_main_~n~0_42} OutVars{main_~i~0=v_main_~i~0_633, main_~n~0=v_main_~n~0_42} AuxVars[] AssignedVars[] [2021-05-02 23:32:34,085 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:32:34,086 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:34,092 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:32:34,113 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:32:34,130 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:34,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:34,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:34,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:34,418 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:32:34,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:34,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:32:34,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:34,426 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:32:35,350 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:35,351 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [172618224] [2021-05-02 23:32:35,351 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [172618224] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:35,351 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:35,351 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-02 23:32:35,351 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961389185] [2021-05-02 23:32:35,351 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 23:32:35,351 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:35,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 23:32:35,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=1423, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 23:32:35,352 INFO L87 Difference]: Start difference. First operand 68 states and 82 transitions. Second operand has 39 states, 38 states have (on average 1.1578947368421053) internal successors, (44), 37 states have internal predecessors, (44), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:32:37,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:37,706 INFO L93 Difference]: Finished difference Result 92 states and 108 transitions. [2021-05-02 23:32:37,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 23:32:37,706 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 1.1578947368421053) internal successors, (44), 37 states have internal predecessors, (44), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 55 [2021-05-02 23:32:37,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:37,707 INFO L225 Difference]: With dead ends: 92 [2021-05-02 23:32:37,707 INFO L226 Difference]: Without dead ends: 68 [2021-05-02 23:32:37,707 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1057 ImplicationChecksByTransitivity, 2647.7ms TimeCoverageRelationStatistics Valid=401, Invalid=5451, Unknown=0, NotChecked=0, Total=5852 [2021-05-02 23:32:37,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-02 23:32:37,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-05-02 23:32:37,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 59 states have (on average 1.2033898305084745) internal successors, (71), 60 states have internal predecessors, (71), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:32:37,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 80 transitions. [2021-05-02 23:32:37,718 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 80 transitions. Word has length 55 [2021-05-02 23:32:37,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:37,718 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 80 transitions. [2021-05-02 23:32:37,718 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 38 states have (on average 1.1578947368421053) internal successors, (44), 37 states have internal predecessors, (44), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:32:37,718 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 80 transitions. [2021-05-02 23:32:37,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 23:32:37,718 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:37,718 INFO L523 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:37,718 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-05-02 23:32:37,718 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:37,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:37,719 INFO L82 PathProgramCache]: Analyzing trace with hash -77559386, now seen corresponding path program 20 times [2021-05-02 23:32:37,719 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:37,719 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1710494390] [2021-05-02 23:32:37,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:37,722 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_663 v_main_~n~0_43) InVars {main_~i~0=v_main_~i~0_663, main_~n~0=v_main_~n~0_43} OutVars{main_~i~0=v_main_~i~0_663, main_~n~0=v_main_~n~0_43} AuxVars[] AssignedVars[] [2021-05-02 23:32:37,724 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:32:37,724 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:37,730 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:32:37,750 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:32:37,767 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:37,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:37,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:37,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:37,848 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 23:32:39,346 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:39,346 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1710494390] [2021-05-02 23:32:39,346 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1710494390] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:39,346 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:39,346 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2021-05-02 23:32:39,346 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698063486] [2021-05-02 23:32:39,346 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-02 23:32:39,346 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:39,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-02 23:32:39,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=2176, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 23:32:39,347 INFO L87 Difference]: Start difference. First operand 68 states and 80 transitions. Second operand has 48 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 46 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:32:45,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:45,243 INFO L93 Difference]: Finished difference Result 122 states and 147 transitions. [2021-05-02 23:32:45,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-02 23:32:45,243 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 46 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-05-02 23:32:45,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:45,244 INFO L225 Difference]: With dead ends: 122 [2021-05-02 23:32:45,244 INFO L226 Difference]: Without dead ends: 120 [2021-05-02 23:32:45,245 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2576 ImplicationChecksByTransitivity, 5260.2ms TimeCoverageRelationStatistics Valid=798, Invalid=12774, Unknown=0, NotChecked=0, Total=13572 [2021-05-02 23:32:45,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-05-02 23:32:45,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 70. [2021-05-02 23:32:45,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 61 states have (on average 1.2295081967213115) internal successors, (75), 62 states have internal predecessors, (75), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:32:45,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-05-02 23:32:45,256 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 53 [2021-05-02 23:32:45,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:45,256 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-05-02 23:32:45,256 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 46 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:32:45,256 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-05-02 23:32:45,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 23:32:45,256 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:45,256 INFO L523 BasicCegarLoop]: trace histogram [29, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:45,256 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-05-02 23:32:45,256 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:45,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:45,257 INFO L82 PathProgramCache]: Analyzing trace with hash -1104311354, now seen corresponding path program 15 times [2021-05-02 23:32:45,257 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:45,257 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [323432949] [2021-05-02 23:32:45,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:45,260 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_705 v_main_~n~0_44) InVars {main_~i~0=v_main_~i~0_705, main_~n~0=v_main_~n~0_44} OutVars{main_~i~0=v_main_~i~0_705, main_~n~0=v_main_~n~0_44} AuxVars[] AssignedVars[] [2021-05-02 23:32:45,262 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:32:45,271 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:45,276 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:32:45,287 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:32:45,303 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:45,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:45,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:45,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:45,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:32:45,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:45,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:32:45,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:45,534 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:32:46,583 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:46,584 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [323432949] [2021-05-02 23:32:46,584 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [323432949] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:46,584 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:46,585 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-02 23:32:46,585 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124108203] [2021-05-02 23:32:46,586 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 23:32:46,586 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:46,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 23:32:46,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=1626, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 23:32:46,587 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 41 states, 40 states have (on average 1.15) internal successors, (46), 39 states have internal predecessors, (46), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:32:49,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:49,114 INFO L93 Difference]: Finished difference Result 94 states and 110 transitions. [2021-05-02 23:32:49,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-02 23:32:49,115 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 1.15) internal successors, (46), 39 states have internal predecessors, (46), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 57 [2021-05-02 23:32:49,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:49,116 INFO L225 Difference]: With dead ends: 94 [2021-05-02 23:32:49,116 INFO L226 Difference]: Without dead ends: 70 [2021-05-02 23:32:49,116 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1207 ImplicationChecksByTransitivity, 2842.6ms TimeCoverageRelationStatistics Valid=492, Invalid=6150, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 23:32:49,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-05-02 23:32:49,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2021-05-02 23:32:49,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 61 states have (on average 1.1967213114754098) internal successors, (73), 62 states have internal predecessors, (73), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:32:49,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 82 transitions. [2021-05-02 23:32:49,127 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 82 transitions. Word has length 57 [2021-05-02 23:32:49,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:49,127 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 82 transitions. [2021-05-02 23:32:49,127 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 40 states have (on average 1.15) internal successors, (46), 39 states have internal predecessors, (46), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:32:49,127 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 82 transitions. [2021-05-02 23:32:49,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 23:32:49,127 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:49,127 INFO L523 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:49,127 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-05-02 23:32:49,127 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:49,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:49,128 INFO L82 PathProgramCache]: Analyzing trace with hash -605560026, now seen corresponding path program 21 times [2021-05-02 23:32:49,128 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:49,128 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1240531573] [2021-05-02 23:32:49,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:49,144 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_737 v_main_~n~0_45) InVars {main_~i~0=v_main_~i~0_737, main_~n~0=v_main_~n~0_45} OutVars{main_~i~0=v_main_~i~0_737, main_~n~0=v_main_~n~0_45} AuxVars[] AssignedVars[] [2021-05-02 23:32:49,145 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:32:49,155 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:49,161 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:32:49,172 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:32:49,190 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:49,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:49,279 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:49,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:49,282 INFO 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 23:32:50,966 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:50,966 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1240531573] [2021-05-02 23:32:50,966 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1240531573] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:50,966 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:50,966 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2021-05-02 23:32:50,966 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1533320667] [2021-05-02 23:32:50,967 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 23:32:50,967 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:50,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 23:32:50,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=2366, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 23:32:50,967 INFO L87 Difference]: Start difference. First operand 70 states and 82 transitions. Second operand has 50 states, 49 states have (on average 1.0408163265306123) internal successors, (51), 48 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:32:57,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:57,699 INFO L93 Difference]: Finished difference Result 124 states and 149 transitions. [2021-05-02 23:32:57,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-05-02 23:32:57,699 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 49 states have (on average 1.0408163265306123) internal successors, (51), 48 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2021-05-02 23:32:57,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:57,700 INFO L225 Difference]: With dead ends: 124 [2021-05-02 23:32:57,700 INFO L226 Difference]: Without dead ends: 122 [2021-05-02 23:32:57,701 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2729 ImplicationChecksByTransitivity, 5839.9ms TimeCoverageRelationStatistics Valid=822, Invalid=13698, Unknown=0, NotChecked=0, Total=14520 [2021-05-02 23:32:57,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-05-02 23:32:57,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 72. [2021-05-02 23:32:57,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 63 states have (on average 1.2222222222222223) internal successors, (77), 64 states have internal predecessors, (77), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:32:57,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 86 transitions. [2021-05-02 23:32:57,713 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 86 transitions. Word has length 55 [2021-05-02 23:32:57,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:57,713 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 86 transitions. [2021-05-02 23:32:57,713 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 49 states have (on average 1.0408163265306123) internal successors, (51), 48 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:32:57,713 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 86 transitions. [2021-05-02 23:32:57,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 23:32:57,713 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:57,713 INFO L523 BasicCegarLoop]: trace histogram [31, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:57,713 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2021-05-02 23:32:57,713 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:57,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:57,714 INFO L82 PathProgramCache]: Analyzing trace with hash -261348026, now seen corresponding path program 16 times [2021-05-02 23:32:57,714 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:57,714 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [617374385] [2021-05-02 23:32:57,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:57,718 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_781 v_main_~n~0_46) InVars {main_~i~0=v_main_~i~0_781, main_~n~0=v_main_~n~0_46} OutVars{main_~i~0=v_main_~i~0_781, main_~n~0=v_main_~n~0_46} AuxVars[] AssignedVars[] [2021-05-02 23:32:57,720 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:32:57,721 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:57,728 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:32:57,751 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:32:57,771 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:57,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:58,093 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:58,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:58,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:32:58,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:58,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:32:58,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:58,103 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:32:59,363 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:59,363 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [617374385] [2021-05-02 23:32:59,364 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [617374385] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:59,364 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:59,364 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-02 23:32:59,364 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444757259] [2021-05-02 23:32:59,364 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 23:32:59,364 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:59,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 23:32:59,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=1739, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 23:32:59,365 INFO L87 Difference]: Start difference. First operand 72 states and 86 transitions. Second operand has 43 states, 42 states have (on average 1.1428571428571428) internal successors, (48), 41 states have internal predecessors, (48), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:33:02,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:02,503 INFO L93 Difference]: Finished difference Result 96 states and 112 transitions. [2021-05-02 23:33:02,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 23:33:02,503 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 42 states have (on average 1.1428571428571428) internal successors, (48), 41 states have internal predecessors, (48), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 59 [2021-05-02 23:33:02,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:02,504 INFO L225 Difference]: With dead ends: 96 [2021-05-02 23:33:02,504 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 23:33:02,504 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1263 ImplicationChecksByTransitivity, 3406.9ms TimeCoverageRelationStatistics Valid=445, Invalid=6695, Unknown=0, NotChecked=0, Total=7140 [2021-05-02 23:33:02,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 23:33:02,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2021-05-02 23:33:02,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 63 states have (on average 1.1904761904761905) internal successors, (75), 64 states have internal predecessors, (75), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:33:02,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 84 transitions. [2021-05-02 23:33:02,515 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 84 transitions. Word has length 59 [2021-05-02 23:33:02,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:02,516 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 84 transitions. [2021-05-02 23:33:02,516 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 42 states have (on average 1.1428571428571428) internal successors, (48), 41 states have internal predecessors, (48), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:33:02,516 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 84 transitions. [2021-05-02 23:33:02,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 23:33:02,516 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:02,516 INFO L523 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:33:02,516 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-05-02 23:33:02,516 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:02,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:02,516 INFO L82 PathProgramCache]: Analyzing trace with hash -1208034138, now seen corresponding path program 22 times [2021-05-02 23:33:02,516 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:02,517 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1088845957] [2021-05-02 23:33:02,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:02,520 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_815 v_main_~n~0_47) InVars {main_~i~0=v_main_~i~0_815, main_~n~0=v_main_~n~0_47} OutVars{main_~i~0=v_main_~i~0_815, main_~n~0=v_main_~n~0_47} AuxVars[] AssignedVars[] [2021-05-02 23:33:02,521 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:33:02,531 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:02,537 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:33:02,549 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:33:02,567 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:02,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:02,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:02,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:02,658 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:33:04,597 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:04,598 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1088845957] [2021-05-02 23:33:04,598 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1088845957] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:04,598 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:04,598 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2021-05-02 23:33:04,598 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1546990750] [2021-05-02 23:33:04,598 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-02 23:33:04,598 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:04,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-02 23:33:04,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=2621, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 23:33:04,599 INFO L87 Difference]: Start difference. First operand 72 states and 84 transitions. Second operand has 52 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 50 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:33:12,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:12,160 INFO L93 Difference]: Finished difference Result 126 states and 151 transitions. [2021-05-02 23:33:12,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-05-02 23:33:12,161 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 50 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2021-05-02 23:33:12,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:12,162 INFO L225 Difference]: With dead ends: 126 [2021-05-02 23:33:12,162 INFO L226 Difference]: Without dead ends: 124 [2021-05-02 23:33:12,163 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2942 ImplicationChecksByTransitivity, 6691.4ms TimeCoverageRelationStatistics Valid=963, Invalid=14787, Unknown=0, NotChecked=0, Total=15750 [2021-05-02 23:33:12,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-05-02 23:33:12,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 74. [2021-05-02 23:33:12,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 65 states have (on average 1.2153846153846153) internal successors, (79), 66 states have internal predecessors, (79), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:33:12,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 88 transitions. [2021-05-02 23:33:12,175 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 88 transitions. Word has length 57 [2021-05-02 23:33:12,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:12,175 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 88 transitions. [2021-05-02 23:33:12,175 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 50 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:33:12,175 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 88 transitions. [2021-05-02 23:33:12,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 23:33:12,176 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:12,176 INFO L523 BasicCegarLoop]: trace histogram [33, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:33:12,176 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-05-02 23:33:12,176 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:12,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:12,176 INFO L82 PathProgramCache]: Analyzing trace with hash -1922408762, now seen corresponding path program 17 times [2021-05-02 23:33:12,176 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:12,176 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1310948976] [2021-05-02 23:33:12,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:12,182 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_861 v_main_~n~0_48) InVars {main_~i~0=v_main_~i~0_861, main_~n~0=v_main_~n~0_48} OutVars{main_~i~0=v_main_~i~0_861, main_~n~0=v_main_~n~0_48} AuxVars[] AssignedVars[] [2021-05-02 23:33:12,184 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:33:12,185 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:12,192 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:33:12,221 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:33:12,245 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:12,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:12,581 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:12,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:12,585 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:33:12,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:12,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:33:12,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:12,590 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:33:14,189 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:14,189 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1310948976] [2021-05-02 23:33:14,189 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1310948976] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:14,189 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:14,190 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2021-05-02 23:33:14,190 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065704449] [2021-05-02 23:33:14,190 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 23:33:14,190 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:14,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 23:33:14,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=1962, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 23:33:14,190 INFO L87 Difference]: Start difference. First operand 74 states and 88 transitions. Second operand has 45 states, 44 states have (on average 1.1363636363636365) internal successors, (50), 43 states have internal predecessors, (50), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:33:18,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:18,139 INFO L93 Difference]: Finished difference Result 98 states and 114 transitions. [2021-05-02 23:33:18,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 23:33:18,140 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 44 states have (on average 1.1363636363636365) internal successors, (50), 43 states have internal predecessors, (50), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 61 [2021-05-02 23:33:18,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:18,141 INFO L225 Difference]: With dead ends: 98 [2021-05-02 23:33:18,141 INFO L226 Difference]: Without dead ends: 74 [2021-05-02 23:33:18,142 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1425 ImplicationChecksByTransitivity, 4231.6ms TimeCoverageRelationStatistics Valid=544, Invalid=7466, Unknown=0, NotChecked=0, Total=8010 [2021-05-02 23:33:18,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-02 23:33:18,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2021-05-02 23:33:18,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 65 states have (on average 1.1846153846153846) internal successors, (77), 66 states have internal predecessors, (77), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:33:18,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 86 transitions. [2021-05-02 23:33:18,154 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 86 transitions. Word has length 61 [2021-05-02 23:33:18,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:18,154 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 86 transitions. [2021-05-02 23:33:18,154 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 44 states have (on average 1.1363636363636365) internal successors, (50), 43 states have internal predecessors, (50), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:33:18,154 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 86 transitions. [2021-05-02 23:33:18,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 23:33:18,154 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:18,154 INFO L523 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:33:18,154 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-05-02 23:33:18,155 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:18,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:18,155 INFO L82 PathProgramCache]: Analyzing trace with hash -365070810, now seen corresponding path program 23 times [2021-05-02 23:33:18,155 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:18,155 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [418395770] [2021-05-02 23:33:18,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:18,168 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_897 v_main_~n~0_49) InVars {main_~i~0=v_main_~i~0_897, main_~n~0=v_main_~n~0_49} OutVars{main_~i~0=v_main_~i~0_897, main_~n~0=v_main_~n~0_49} AuxVars[] AssignedVars[] [2021-05-02 23:33:18,170 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:33:18,170 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:18,177 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:33:18,203 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:33:18,226 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:18,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:18,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:18,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:18,330 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:33:20,703 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:20,703 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [418395770] [2021-05-02 23:33:20,703 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [418395770] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:20,703 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:20,703 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2021-05-02 23:33:20,704 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718575950] [2021-05-02 23:33:20,704 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-02 23:33:20,704 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:20,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-02 23:33:20,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=2829, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 23:33:20,704 INFO L87 Difference]: Start difference. First operand 74 states and 86 transitions. Second operand has 54 states, 53 states have (on average 1.0377358490566038) internal successors, (55), 52 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:33:29,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:29,789 INFO L93 Difference]: Finished difference Result 128 states and 153 transitions. [2021-05-02 23:33:29,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-05-02 23:33:29,790 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 53 states have (on average 1.0377358490566038) internal successors, (55), 52 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-02 23:33:29,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:29,791 INFO L225 Difference]: With dead ends: 128 [2021-05-02 23:33:29,791 INFO L226 Difference]: Without dead ends: 126 [2021-05-02 23:33:29,792 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3105 ImplicationChecksByTransitivity, 8001.3ms TimeCoverageRelationStatistics Valid=991, Invalid=15779, Unknown=0, NotChecked=0, Total=16770 [2021-05-02 23:33:29,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-05-02 23:33:29,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 76. [2021-05-02 23:33:29,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 67 states have (on average 1.208955223880597) internal successors, (81), 68 states have internal predecessors, (81), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:33:29,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 90 transitions. [2021-05-02 23:33:29,805 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 90 transitions. Word has length 59 [2021-05-02 23:33:29,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:29,806 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 90 transitions. [2021-05-02 23:33:29,806 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 53 states have (on average 1.0377358490566038) internal successors, (55), 52 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:33:29,806 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 90 transitions. [2021-05-02 23:33:29,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 23:33:29,806 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:29,806 INFO L523 BasicCegarLoop]: trace histogram [35, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:33:29,806 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-05-02 23:33:29,806 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:29,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:29,806 INFO L82 PathProgramCache]: Analyzing trace with hash -473941946, now seen corresponding path program 18 times [2021-05-02 23:33:29,807 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:29,807 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [946286373] [2021-05-02 23:33:29,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:29,813 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_945 v_main_~n~0_50) InVars {main_~i~0=v_main_~i~0_945, main_~n~0=v_main_~n~0_50} OutVars{main_~i~0=v_main_~i~0_945, main_~n~0=v_main_~n~0_50} AuxVars[] AssignedVars[] [2021-05-02 23:33:29,815 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:33:29,817 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:29,826 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:33:29,860 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:33:29,886 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:29,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:30,233 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:30,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:30,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:33:30,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:30,253 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:33:30,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:30,256 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:33:31,942 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:31,942 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [946286373] [2021-05-02 23:33:31,942 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [946286373] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:31,942 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:31,942 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2021-05-02 23:33:31,942 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747777191] [2021-05-02 23:33:31,942 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 23:33:31,943 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:31,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 23:33:31,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=2087, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 23:33:31,943 INFO L87 Difference]: Start difference. First operand 76 states and 90 transitions. Second operand has 47 states, 46 states have (on average 1.1304347826086956) internal successors, (52), 45 states have internal predecessors, (52), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:33:35,857 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 44 [2021-05-02 23:33:36,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:36,543 INFO L93 Difference]: Finished difference Result 100 states and 116 transitions. [2021-05-02 23:33:36,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-02 23:33:36,545 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 46 states have (on average 1.1304347826086956) internal successors, (52), 45 states have internal predecessors, (52), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 63 [2021-05-02 23:33:36,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:36,545 INFO L225 Difference]: With dead ends: 100 [2021-05-02 23:33:36,545 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 23:33:36,546 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1485 ImplicationChecksByTransitivity, 4788.0ms TimeCoverageRelationStatistics Valid=489, Invalid=8067, Unknown=0, NotChecked=0, Total=8556 [2021-05-02 23:33:36,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 23:33:36,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2021-05-02 23:33:36,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 67 states have (on average 1.1791044776119404) internal successors, (79), 68 states have internal predecessors, (79), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:33:36,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 88 transitions. [2021-05-02 23:33:36,558 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 88 transitions. Word has length 63 [2021-05-02 23:33:36,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:36,558 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 88 transitions. [2021-05-02 23:33:36,558 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 46 states have (on average 1.1304347826086956) internal successors, (52), 45 states have internal predecessors, (52), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:33:36,558 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 88 transitions. [2021-05-02 23:33:36,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 23:33:36,559 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:36,559 INFO L523 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:33:36,559 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-05-02 23:33:36,559 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:36,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:36,559 INFO L82 PathProgramCache]: Analyzing trace with hash -2026131546, now seen corresponding path program 24 times [2021-05-02 23:33:36,559 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:36,559 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [43041276] [2021-05-02 23:33:36,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:36,565 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_983 v_main_~n~0_51) InVars {main_~i~0=v_main_~i~0_983, main_~n~0=v_main_~n~0_51} OutVars{main_~i~0=v_main_~i~0_983, main_~n~0=v_main_~n~0_51} AuxVars[] AssignedVars[] [2021-05-02 23:33:36,567 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:33:36,568 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:36,577 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:33:36,606 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:33:36,646 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:36,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:36,764 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:36,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:36,768 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:33:39,618 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:39,619 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [43041276] [2021-05-02 23:33:39,619 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [43041276] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:39,619 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:39,619 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [56] imperfect sequences [] total 56 [2021-05-02 23:33:39,619 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104900241] [2021-05-02 23:33:39,619 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-02 23:33:39,619 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:39,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-02 23:33:39,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=2984, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 23:33:39,620 INFO L87 Difference]: Start difference. First operand 76 states and 88 transitions. Second operand has 56 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 54 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:33:47,269 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 44 [2021-05-02 23:33:48,426 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:33:50,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:50,217 INFO L93 Difference]: Finished difference Result 130 states and 155 transitions. [2021-05-02 23:33:50,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-05-02 23:33:50,218 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 54 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 61 [2021-05-02 23:33:50,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:50,219 INFO L225 Difference]: With dead ends: 130 [2021-05-02 23:33:50,219 INFO L226 Difference]: Without dead ends: 128 [2021-05-02 23:33:50,220 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3212 ImplicationChecksByTransitivity, 9265.1ms TimeCoverageRelationStatistics Valid=894, Invalid=16662, Unknown=0, NotChecked=0, Total=17556 [2021-05-02 23:33:50,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-05-02 23:33:50,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 78. [2021-05-02 23:33:50,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 69 states have (on average 1.2028985507246377) internal successors, (83), 70 states have internal predecessors, (83), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:33:50,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 92 transitions. [2021-05-02 23:33:50,233 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 92 transitions. Word has length 61 [2021-05-02 23:33:50,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:50,234 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 92 transitions. [2021-05-02 23:33:50,234 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 54 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:33:50,234 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 92 transitions. [2021-05-02 23:33:50,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 23:33:50,234 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:50,234 INFO L523 BasicCegarLoop]: trace histogram [37, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:33:50,234 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2021-05-02 23:33:50,234 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:50,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:50,234 INFO L82 PathProgramCache]: Analyzing trace with hash -66735674, now seen corresponding path program 19 times [2021-05-02 23:33:50,234 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:50,235 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [948929943] [2021-05-02 23:33:50,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:50,240 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1033 v_main_~n~0_52) InVars {main_~i~0=v_main_~i~0_1033, main_~n~0=v_main_~n~0_52} OutVars{main_~i~0=v_main_~i~0_1033, main_~n~0=v_main_~n~0_52} AuxVars[] AssignedVars[] [2021-05-02 23:33:50,245 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:33:50,246 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:50,258 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:33:50,298 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:33:50,329 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:50,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:50,705 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:50,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:50,708 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:33:50,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:50,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:33:50,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:50,720 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:33:53,030 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:53,030 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [948929943] [2021-05-02 23:33:53,030 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [948929943] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:53,030 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:53,030 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2021-05-02 23:33:53,030 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644450822] [2021-05-02 23:33:53,031 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 23:33:53,031 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:53,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 23:33:53,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=2330, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 23:33:53,031 INFO L87 Difference]: Start difference. First operand 78 states and 92 transitions. Second operand has 49 states, 48 states have (on average 1.125) internal successors, (54), 47 states have internal predecessors, (54), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:33:57,967 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 42 [2021-05-02 23:33:58,664 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 43 [2021-05-02 23:33:58,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:58,955 INFO L93 Difference]: Finished difference Result 102 states and 118 transitions. [2021-05-02 23:33:58,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 23:33:58,956 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 1.125) internal successors, (54), 47 states have internal predecessors, (54), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 65 [2021-05-02 23:33:58,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:58,957 INFO L225 Difference]: With dead ends: 102 [2021-05-02 23:33:58,957 INFO L226 Difference]: Without dead ends: 78 [2021-05-02 23:33:58,958 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1659 ImplicationChecksByTransitivity, 6040.9ms TimeCoverageRelationStatistics Valid=596, Invalid=8910, Unknown=0, NotChecked=0, Total=9506 [2021-05-02 23:33:58,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-02 23:33:58,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2021-05-02 23:33:58,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 69 states have (on average 1.173913043478261) internal successors, (81), 70 states have internal predecessors, (81), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:33:58,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 90 transitions. [2021-05-02 23:33:58,970 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 90 transitions. Word has length 65 [2021-05-02 23:33:58,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:58,970 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 90 transitions. [2021-05-02 23:33:58,971 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 48 states have (on average 1.125) internal successors, (54), 47 states have internal predecessors, (54), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:33:58,971 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 90 transitions. [2021-05-02 23:33:58,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 23:33:58,971 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:58,971 INFO L523 BasicCegarLoop]: trace histogram [49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:33:58,971 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2021-05-02 23:33:58,971 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:58,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:58,971 INFO L82 PathProgramCache]: Analyzing trace with hash -577664730, now seen corresponding path program 25 times [2021-05-02 23:33:58,971 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:58,971 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [32939447] [2021-05-02 23:33:58,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:58,986 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1073 v_main_~n~0_53) InVars {main_~i~0=v_main_~i~0_1073, main_~n~0=v_main_~n~0_53} OutVars{main_~i~0=v_main_~i~0_1073, main_~n~0=v_main_~n~0_53} AuxVars[] AssignedVars[] [2021-05-02 23:33:58,987 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:33:58,988 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:58,996 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:33:59,030 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:33:59,063 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:59,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:59,206 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:59,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:59,212 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:34:02,734 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:34:02,734 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [32939447] [2021-05-02 23:34:02,734 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [32939447] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:34:02,734 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:34:02,734 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [58] imperfect sequences [] total 58 [2021-05-02 23:34:02,734 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628638331] [2021-05-02 23:34:02,734 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-02 23:34:02,734 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:34:02,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-02 23:34:02,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=3205, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 23:34:02,735 INFO L87 Difference]: Start difference. First operand 78 states and 90 transitions. Second operand has 58 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 56 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:34:12,255 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 45 [2021-05-02 23:34:15,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:34:15,829 INFO L93 Difference]: Finished difference Result 132 states and 157 transitions. [2021-05-02 23:34:15,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-05-02 23:34:15,830 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 56 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 63 [2021-05-02 23:34:15,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:34:15,830 INFO L225 Difference]: With dead ends: 132 [2021-05-02 23:34:15,830 INFO L226 Difference]: Without dead ends: 130 [2021-05-02 23:34:15,831 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3239 ImplicationChecksByTransitivity, 11023.4ms TimeCoverageRelationStatistics Valid=843, Invalid=17517, Unknown=0, NotChecked=0, Total=18360 [2021-05-02 23:34:15,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-05-02 23:34:15,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 80. [2021-05-02 23:34:15,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 71 states have (on average 1.1971830985915493) internal successors, (85), 72 states have internal predecessors, (85), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:34:15,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 94 transitions. [2021-05-02 23:34:15,845 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 94 transitions. Word has length 63 [2021-05-02 23:34:15,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:34:15,845 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 94 transitions. [2021-05-02 23:34:15,845 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 56 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:34:15,845 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 94 transitions. [2021-05-02 23:34:15,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-02 23:34:15,846 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:34:15,846 INFO L523 BasicCegarLoop]: trace histogram [39, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:34:15,846 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-05-02 23:34:15,846 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:34:15,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:34:15,846 INFO L82 PathProgramCache]: Analyzing trace with hash 416467782, now seen corresponding path program 20 times [2021-05-02 23:34:15,846 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:34:15,846 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [990121171] [2021-05-02 23:34:15,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:34:15,852 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1125 v_main_~n~0_54) InVars {main_~i~0=v_main_~i~0_1125, main_~n~0=v_main_~n~0_54} OutVars{main_~i~0=v_main_~i~0_1125, main_~n~0=v_main_~n~0_54} AuxVars[] AssignedVars[] [2021-05-02 23:34:15,853 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:34:15,869 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:34:15,877 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:34:15,896 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:34:15,925 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:34:15,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:16,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:34:16,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:16,251 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:34:16,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:16,254 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:34:16,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:16,257 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:34:19,037 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:34:19,037 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [990121171] [2021-05-02 23:34:19,037 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [990121171] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:34:19,037 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:34:19,037 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2021-05-02 23:34:19,037 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890914868] [2021-05-02 23:34:19,037 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 23:34:19,037 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:34:19,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 23:34:19,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=2526, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 23:34:19,038 INFO L87 Difference]: Start difference. First operand 80 states and 94 transitions. Second operand has 51 states, 50 states have (on average 1.12) internal successors, (56), 49 states have internal predecessors, (56), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:34:25,178 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 41 [2021-05-02 23:34:25,804 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 43 [2021-05-02 23:34:26,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:34:26,035 INFO L93 Difference]: Finished difference Result 104 states and 120 transitions. [2021-05-02 23:34:26,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-02 23:34:26,037 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 50 states have (on average 1.12) internal successors, (56), 49 states have internal predecessors, (56), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 67 [2021-05-02 23:34:26,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:34:26,038 INFO L225 Difference]: With dead ends: 104 [2021-05-02 23:34:26,038 INFO L226 Difference]: Without dead ends: 80 [2021-05-02 23:34:26,038 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1782 ImplicationChecksByTransitivity, 7202.5ms TimeCoverageRelationStatistics Valid=622, Invalid=9680, Unknown=0, NotChecked=0, Total=10302 [2021-05-02 23:34:26,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-05-02 23:34:26,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2021-05-02 23:34:26,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 71 states have (on average 1.1690140845070423) internal successors, (83), 72 states have internal predecessors, (83), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:34:26,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 92 transitions. [2021-05-02 23:34:26,052 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 92 transitions. Word has length 67 [2021-05-02 23:34:26,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:34:26,052 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 92 transitions. [2021-05-02 23:34:26,052 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 50 states have (on average 1.12) internal successors, (56), 49 states have internal predecessors, (56), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:34:26,052 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 92 transitions. [2021-05-02 23:34:26,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 23:34:26,053 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:34:26,053 INFO L523 BasicCegarLoop]: trace histogram [51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:34:26,053 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2021-05-02 23:34:26,053 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:34:26,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:34:26,053 INFO L82 PathProgramCache]: Analyzing trace with hash -170458458, now seen corresponding path program 26 times [2021-05-02 23:34:26,053 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:34:26,053 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2020594882] [2021-05-02 23:34:26,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:34:26,059 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1167 v_main_~n~0_55) InVars {main_~i~0=v_main_~i~0_1167, main_~n~0=v_main_~n~0_55} OutVars{main_~i~0=v_main_~i~0_1167, main_~n~0=v_main_~n~0_55} AuxVars[] AssignedVars[] [2021-05-02 23:34:26,061 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:34:26,063 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:34:26,075 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:34:26,124 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:34:26,171 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:34:26,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:26,348 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:34:26,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:26,352 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:34:30,635 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:34:30,635 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2020594882] [2021-05-02 23:34:30,635 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2020594882] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:34:30,635 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:34:30,635 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [60] imperfect sequences [] total 60 [2021-05-02 23:34:30,635 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314411556] [2021-05-02 23:34:30,635 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-02 23:34:30,635 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:34:30,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-02 23:34:30,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=3436, Unknown=0, NotChecked=0, Total=3660 [2021-05-02 23:34:30,636 INFO L87 Difference]: Start difference. First operand 80 states and 92 transitions. Second operand has 60 states, 59 states have (on average 1.0338983050847457) internal successors, (61), 58 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:34:36,890 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:34:37,609 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:34:38,371 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 41 [2021-05-02 23:34:44,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:34:44,309 INFO L93 Difference]: Finished difference Result 134 states and 159 transitions. [2021-05-02 23:34:44,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-05-02 23:34:44,310 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 59 states have (on average 1.0338983050847457) internal successors, (61), 58 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-05-02 23:34:44,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:34:44,311 INFO L225 Difference]: With dead ends: 134 [2021-05-02 23:34:44,311 INFO L226 Difference]: Without dead ends: 132 [2021-05-02 23:34:44,312 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3554 ImplicationChecksByTransitivity, 12366.2ms TimeCoverageRelationStatistics Valid=942, Invalid=18798, Unknown=0, NotChecked=0, Total=19740 [2021-05-02 23:34:44,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-05-02 23:34:44,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 82. [2021-05-02 23:34:44,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 73 states have (on average 1.1917808219178083) internal successors, (87), 74 states have internal predecessors, (87), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:34:44,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 96 transitions. [2021-05-02 23:34:44,326 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 96 transitions. Word has length 65 [2021-05-02 23:34:44,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:34:44,327 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 96 transitions. [2021-05-02 23:34:44,327 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 59 states have (on average 1.0338983050847457) internal successors, (61), 58 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:34:44,327 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 96 transitions. [2021-05-02 23:34:44,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-02 23:34:44,327 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:34:44,327 INFO L523 BasicCegarLoop]: trace histogram [41, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:34:44,327 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2021-05-02 23:34:44,327 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:34:44,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:34:44,327 INFO L82 PathProgramCache]: Analyzing trace with hash 918521030, now seen corresponding path program 21 times [2021-05-02 23:34:44,327 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:34:44,328 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1442474571] [2021-05-02 23:34:44,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:34:44,333 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1221 v_main_~n~0_56) InVars {main_~i~0=v_main_~i~0_1221, main_~n~0=v_main_~n~0_56} OutVars{main_~i~0=v_main_~i~0_1221, main_~n~0=v_main_~n~0_56} AuxVars[] AssignedVars[] [2021-05-02 23:34:44,338 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:34:44,339 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:34:44,347 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:34:44,377 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:34:44,405 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:34:44,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:44,681 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 20 [2021-05-02 23:34:44,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:34:44,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:44,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:34:44,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:44,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:34:44,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:44,861 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:34:47,465 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:34:47,465 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1442474571] [2021-05-02 23:34:47,465 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1442474571] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:34:47,465 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:34:47,465 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2021-05-02 23:34:47,465 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481196301] [2021-05-02 23:34:47,466 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-02 23:34:47,466 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:34:47,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-02 23:34:47,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=2669, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 23:34:47,466 INFO L87 Difference]: Start difference. First operand 82 states and 96 transitions. Second operand has 53 states, 52 states have (on average 1.1153846153846154) internal successors, (58), 51 states have internal predecessors, (58), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:34:53,259 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 42 [2021-05-02 23:34:53,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:34:53,948 INFO L93 Difference]: Finished difference Result 106 states and 122 transitions. [2021-05-02 23:34:53,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-02 23:34:53,950 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 52 states have (on average 1.1153846153846154) internal successors, (58), 51 states have internal predecessors, (58), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 69 [2021-05-02 23:34:53,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:34:53,950 INFO L225 Difference]: With dead ends: 106 [2021-05-02 23:34:53,950 INFO L226 Difference]: Without dead ends: 82 [2021-05-02 23:34:53,951 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1848 ImplicationChecksByTransitivity, 6861.4ms TimeCoverageRelationStatistics Valid=555, Invalid=10365, Unknown=0, NotChecked=0, Total=10920 [2021-05-02 23:34:53,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-02 23:34:53,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2021-05-02 23:34:53,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 73 states have (on average 1.1643835616438356) internal successors, (85), 74 states have internal predecessors, (85), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:34:53,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 94 transitions. [2021-05-02 23:34:53,965 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 94 transitions. Word has length 69 [2021-05-02 23:34:53,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:34:53,965 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 94 transitions. [2021-05-02 23:34:53,965 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 52 states have (on average 1.1153846153846154) internal successors, (58), 51 states have internal predecessors, (58), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:34:53,966 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 94 transitions. [2021-05-02 23:34:53,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-02 23:34:53,966 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:34:53,966 INFO L523 BasicCegarLoop]: trace histogram [53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:34:53,966 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2021-05-02 23:34:53,966 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:34:53,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:34:53,966 INFO L82 PathProgramCache]: Analyzing trace with hash 312744998, now seen corresponding path program 27 times [2021-05-02 23:34:53,966 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:34:53,966 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [267188226] [2021-05-02 23:34:53,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:34:53,972 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1265 v_main_~n~0_57) InVars {main_~i~0=v_main_~i~0_1265, main_~n~0=v_main_~n~0_57} OutVars{main_~i~0=v_main_~i~0_1265, main_~n~0=v_main_~n~0_57} AuxVars[] AssignedVars[] [2021-05-02 23:34:53,974 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:34:53,976 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:34:53,986 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:34:54,024 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:34:54,053 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:34:54,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:54,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:34:54,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:54,185 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 23:34:57,994 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:34:57,995 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [267188226] [2021-05-02 23:34:57,995 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [267188226] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:34:57,995 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:34:57,995 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [62] imperfect sequences [] total 62 [2021-05-02 23:34:57,995 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132372709] [2021-05-02 23:34:57,995 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-02 23:34:57,995 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:34:57,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-02 23:34:57,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=3674, Unknown=0, NotChecked=0, Total=3906 [2021-05-02 23:34:57,996 INFO L87 Difference]: Start difference. First operand 82 states and 94 transitions. Second operand has 62 states, 61 states have (on average 1.0327868852459017) internal successors, (63), 60 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:35:07,039 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:35:07,603 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:35:07,886 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:35:08,518 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:35:08,817 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 42 [2021-05-02 23:35:09,557 WARN L205 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:35:09,825 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:35:10,522 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 41 [2021-05-02 23:35:10,796 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 42 [2021-05-02 23:35:11,481 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:35:11,776 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 43 [2021-05-02 23:35:12,524 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:35:13,366 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:35:13,670 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 42 [2021-05-02 23:35:14,609 WARN L205 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:35:14,913 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 40 [2021-05-02 23:35:15,607 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:35:15,914 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 43 [2021-05-02 23:35:16,591 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:35:16,905 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 40 [2021-05-02 23:35:17,769 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:35:19,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:35:19,981 INFO L93 Difference]: Finished difference Result 136 states and 161 transitions. [2021-05-02 23:35:19,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-05-02 23:35:19,984 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 61 states have (on average 1.0327868852459017) internal successors, (63), 60 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2021-05-02 23:35:19,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:35:19,985 INFO L225 Difference]: With dead ends: 136 [2021-05-02 23:35:19,985 INFO L226 Difference]: Without dead ends: 134 [2021-05-02 23:35:19,986 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3731 ImplicationChecksByTransitivity, 15621.2ms TimeCoverageRelationStatistics Valid=966, Invalid=19914, Unknown=0, NotChecked=0, Total=20880 [2021-05-02 23:35:19,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-02 23:35:20,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 84. [2021-05-02 23:35:20,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 75 states have (on average 1.1866666666666668) internal successors, (89), 76 states have internal predecessors, (89), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:35:20,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 98 transitions. [2021-05-02 23:35:20,004 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 98 transitions. Word has length 67 [2021-05-02 23:35:20,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:35:20,004 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 98 transitions. [2021-05-02 23:35:20,004 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 62 states, 61 states have (on average 1.0327868852459017) internal successors, (63), 60 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:35:20,004 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 98 transitions. [2021-05-02 23:35:20,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 23:35:20,005 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:35:20,005 INFO L523 BasicCegarLoop]: trace histogram [43, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:35:20,005 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2021-05-02 23:35:20,005 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:35:20,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:35:20,005 INFO L82 PathProgramCache]: Analyzing trace with hash -1939612090, now seen corresponding path program 22 times [2021-05-02 23:35:20,005 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:35:20,005 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [297516008] [2021-05-02 23:35:20,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:35:20,016 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1321 v_main_~n~0_58) InVars {main_~i~0=v_main_~i~0_1321, main_~n~0=v_main_~n~0_58} OutVars{main_~i~0=v_main_~i~0_1321, main_~n~0=v_main_~n~0_58} AuxVars[] AssignedVars[] [2021-05-02 23:35:20,018 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:35:20,046 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:35:20,060 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:35:20,093 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:35:20,155 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:35:20,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:20,458 WARN L205 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 12 [2021-05-02 23:35:20,656 WARN L205 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 20 [2021-05-02 23:35:20,867 WARN L205 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 21 [2021-05-02 23:35:20,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:35:21,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:21,003 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:35:21,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:21,007 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:35:21,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:21,012 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:35:21,117 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 22 [2021-05-02 23:35:26,204 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:35:26,205 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [297516008] [2021-05-02 23:35:26,205 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [297516008] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:35:26,205 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:35:26,205 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [55] imperfect sequences [] total 55 [2021-05-02 23:35:26,205 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150538482] [2021-05-02 23:35:26,205 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-02 23:35:26,205 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:35:26,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-02 23:35:26,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=2879, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 23:35:26,206 INFO L87 Difference]: Start difference. First operand 84 states and 98 transitions. Second operand has 55 states, 54 states have (on average 1.1111111111111112) internal successors, (60), 53 states have internal predecessors, (60), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:35:26,403 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 23:35:36,997 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:35:37,834 WARN L205 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 43 [2021-05-02 23:35:38,269 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 36 [2021-05-02 23:35:38,979 WARN L205 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 43 [2021-05-02 23:35:39,494 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 23:35:39,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:35:39,499 INFO L93 Difference]: Finished difference Result 108 states and 124 transitions. [2021-05-02 23:35:39,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-02 23:35:39,503 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 54 states have (on average 1.1111111111111112) internal successors, (60), 53 states have internal predecessors, (60), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 71 [2021-05-02 23:35:39,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:35:39,504 INFO L225 Difference]: With dead ends: 108 [2021-05-02 23:35:39,504 INFO L226 Difference]: Without dead ends: 84 [2021-05-02 23:35:39,505 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1977 ImplicationChecksByTransitivity, 13186.4ms TimeCoverageRelationStatistics Valid=577, Invalid=11195, Unknown=0, NotChecked=0, Total=11772 [2021-05-02 23:35:39,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-02 23:35:39,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2021-05-02 23:35:39,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 75 states have (on average 1.16) internal successors, (87), 76 states have internal predecessors, (87), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:35:39,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 96 transitions. [2021-05-02 23:35:39,522 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 96 transitions. Word has length 71 [2021-05-02 23:35:39,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:35:39,522 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 96 transitions. [2021-05-02 23:35:39,522 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 54 states have (on average 1.1111111111111112) internal successors, (60), 53 states have internal predecessors, (60), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:35:39,522 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 96 transitions. [2021-05-02 23:35:39,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-02 23:35:39,522 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:35:39,522 INFO L523 BasicCegarLoop]: trace histogram [55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:35:39,522 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2021-05-02 23:35:39,523 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:35:39,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:35:39,523 INFO L82 PathProgramCache]: Analyzing trace with hash 814798246, now seen corresponding path program 28 times [2021-05-02 23:35:39,523 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:35:39,523 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [410661229] [2021-05-02 23:35:39,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:35:39,532 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1367 v_main_~n~0_59) InVars {main_~i~0=v_main_~i~0_1367, main_~n~0=v_main_~n~0_59} OutVars{main_~i~0=v_main_~i~0_1367, main_~n~0=v_main_~n~0_59} AuxVars[] AssignedVars[] [2021-05-02 23:35:39,534 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:35:39,536 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:35:39,555 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:35:39,620 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:35:39,695 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:35:39,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:39,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:35:39,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:39,950 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:35:40,076 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 22 [2021-05-02 23:35:47,414 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:35:47,414 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [410661229] [2021-05-02 23:35:47,414 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [410661229] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:35:47,414 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:35:47,415 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [64] imperfect sequences [] total 64 [2021-05-02 23:35:47,415 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130990552] [2021-05-02 23:35:47,415 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-02 23:35:47,415 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:35:47,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-02 23:35:47,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=3920, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 23:35:47,415 INFO L87 Difference]: Start difference. First operand 84 states and 96 transitions. Second operand has 64 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 62 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:35:47,578 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 23:36:00,461 WARN L205 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 42 [2021-05-02 23:36:01,208 WARN L205 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:36:01,554 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:36:02,271 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 41 [2021-05-02 23:36:02,589 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:36:03,372 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:36:03,708 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 40 [2021-05-02 23:36:04,528 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 41 [2021-05-02 23:36:04,883 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 42 [2021-05-02 23:36:05,659 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:36:05,987 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 42 [2021-05-02 23:36:06,805 WARN L205 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:36:07,154 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 40 [2021-05-02 23:36:08,025 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:36:08,397 WARN L205 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 40 [2021-05-02 23:36:09,381 WARN L205 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:36:09,763 WARN L205 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 43 [2021-05-02 23:36:10,608 WARN L205 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 44 [2021-05-02 23:36:10,927 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:36:11,674 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:36:12,010 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:36:12,512 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 33 [2021-05-02 23:36:12,928 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:36:14,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:36:14,179 INFO L93 Difference]: Finished difference Result 138 states and 163 transitions. [2021-05-02 23:36:14,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-05-02 23:36:14,181 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 62 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 69 [2021-05-02 23:36:14,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:36:14,182 INFO L225 Difference]: With dead ends: 138 [2021-05-02 23:36:14,182 INFO L226 Difference]: Without dead ends: 136 [2021-05-02 23:36:14,183 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3912 ImplicationChecksByTransitivity, 22376.0ms TimeCoverageRelationStatistics Valid=990, Invalid=21062, Unknown=0, NotChecked=0, Total=22052 [2021-05-02 23:36:14,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-05-02 23:36:14,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 86. [2021-05-02 23:36:14,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 77 states have (on average 1.1818181818181819) internal successors, (91), 78 states have internal predecessors, (91), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:36:14,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 100 transitions. [2021-05-02 23:36:14,200 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 100 transitions. Word has length 69 [2021-05-02 23:36:14,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:36:14,200 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 100 transitions. [2021-05-02 23:36:14,200 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 64 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 62 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:36:14,200 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 100 transitions. [2021-05-02 23:36:14,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 23:36:14,201 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:36:14,201 INFO L523 BasicCegarLoop]: trace histogram [45, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:36:14,201 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2021-05-02 23:36:14,201 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:36:14,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:36:14,202 INFO L82 PathProgramCache]: Analyzing trace with hash 173529030, now seen corresponding path program 23 times [2021-05-02 23:36:14,202 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:36:14,202 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [874967794] [2021-05-02 23:36:14,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:36:14,222 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1425 v_main_~n~0_60) InVars {main_~i~0=v_main_~i~0_1425, main_~n~0=v_main_~n~0_60} OutVars{main_~i~0=v_main_~i~0_1425, main_~n~0=v_main_~n~0_60} AuxVars[] AssignedVars[] [2021-05-02 23:36:14,224 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:36:14,253 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:36:14,268 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:36:14,301 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:36:14,353 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:36:14,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:14,596 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 12 [2021-05-02 23:36:14,780 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2021-05-02 23:36:14,933 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 21 [2021-05-02 23:36:15,055 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:36:15,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:15,070 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:36:15,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:15,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:36:15,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:15,079 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:36:20,395 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:36:20,396 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [874967794] [2021-05-02 23:36:20,396 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [874967794] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:36:20,396 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:36:20,396 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2021-05-02 23:36:20,396 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [356331876] [2021-05-02 23:36:20,396 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-02 23:36:20,396 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:36:20,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-02 23:36:20,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=3162, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 23:36:20,397 INFO L87 Difference]: Start difference. First operand 86 states and 100 transitions. Second operand has 57 states, 56 states have (on average 1.1071428571428572) internal successors, (62), 55 states have internal predecessors, (62), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:36:30,508 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:36:31,187 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 42 [2021-05-02 23:36:31,552 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 36 [2021-05-02 23:36:32,192 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 43 [2021-05-02 23:36:32,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:36:32,670 INFO L93 Difference]: Finished difference Result 110 states and 126 transitions. [2021-05-02 23:36:32,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-02 23:36:32,673 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 56 states have (on average 1.1071428571428572) internal successors, (62), 55 states have internal predecessors, (62), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 73 [2021-05-02 23:36:32,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:36:32,674 INFO L225 Difference]: With dead ends: 110 [2021-05-02 23:36:32,674 INFO L226 Difference]: Without dead ends: 86 [2021-05-02 23:36:32,675 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2175 ImplicationChecksByTransitivity, 12478.2ms TimeCoverageRelationStatistics Valid=700, Invalid=12182, Unknown=0, NotChecked=0, Total=12882 [2021-05-02 23:36:32,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-02 23:36:32,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2021-05-02 23:36:32,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 77 states have (on average 1.155844155844156) internal successors, (89), 78 states have internal predecessors, (89), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:36:32,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 98 transitions. [2021-05-02 23:36:32,695 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 98 transitions. Word has length 73 [2021-05-02 23:36:32,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:36:32,695 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 98 transitions. [2021-05-02 23:36:32,695 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 56 states have (on average 1.1071428571428572) internal successors, (62), 55 states have internal predecessors, (62), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:36:32,695 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 98 transitions. [2021-05-02 23:36:32,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 23:36:32,696 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:36:32,696 INFO L523 BasicCegarLoop]: trace histogram [57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:36:32,696 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2021-05-02 23:36:32,696 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:36:32,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:36:32,696 INFO L82 PathProgramCache]: Analyzing trace with hash -2043334874, now seen corresponding path program 29 times [2021-05-02 23:36:32,696 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:36:32,696 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [222233598] [2021-05-02 23:36:32,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:36:32,708 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1473 v_main_~n~0_61) InVars {main_~i~0=v_main_~i~0_1473, main_~n~0=v_main_~n~0_61} OutVars{main_~i~0=v_main_~i~0_1473, main_~n~0=v_main_~n~0_61} AuxVars[] AssignedVars[] [2021-05-02 23:36:32,710 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:36:32,712 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:36:32,725 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:36:32,775 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:36:32,828 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:36:32,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:33,037 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:36:33,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:33,042 INFO 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 23:36:40,880 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:36:40,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [222233598] [2021-05-02 23:36:40,880 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [222233598] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:36:40,880 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:36:40,880 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [66] imperfect sequences [] total 66 [2021-05-02 23:36:40,881 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060412055] [2021-05-02 23:36:40,881 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-02 23:36:40,881 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:36:40,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-02 23:36:40,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=4174, Unknown=0, NotChecked=0, Total=4422 [2021-05-02 23:36:40,882 INFO L87 Difference]: Start difference. First operand 86 states and 98 transitions. Second operand has 66 states, 65 states have (on average 1.0307692307692307) internal successors, (67), 64 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:36:41,117 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 23:36:58,957 WARN L205 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:36:59,719 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:37:00,130 WARN L205 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 43 [2021-05-02 23:37:01,050 WARN L205 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:37:01,449 WARN L205 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:37:02,258 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:37:02,567 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:37:03,380 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 41 [2021-05-02 23:37:03,728 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 40 [2021-05-02 23:37:04,492 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:37:04,829 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 43 [2021-05-02 23:37:05,611 WARN L205 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:37:05,950 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 43 [2021-05-02 23:37:06,871 WARN L205 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 44 [2021-05-02 23:37:07,210 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 42 [2021-05-02 23:37:08,170 WARN L205 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:37:08,495 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:37:09,283 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:37:09,625 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 40 [2021-05-02 23:37:10,361 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 41 [2021-05-02 23:37:10,654 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 43 [2021-05-02 23:37:11,505 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:37:13,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:37:13,084 INFO L93 Difference]: Finished difference Result 140 states and 165 transitions. [2021-05-02 23:37:13,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2021-05-02 23:37:13,086 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 65 states have (on average 1.0307692307692307) internal successors, (67), 64 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 71 [2021-05-02 23:37:13,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:37:13,087 INFO L225 Difference]: With dead ends: 140 [2021-05-02 23:37:13,087 INFO L226 Difference]: Without dead ends: 138 [2021-05-02 23:37:13,089 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4097 ImplicationChecksByTransitivity, 25156.5ms TimeCoverageRelationStatistics Valid=1014, Invalid=22242, Unknown=0, NotChecked=0, Total=23256 [2021-05-02 23:37:13,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-05-02 23:37:13,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 88. [2021-05-02 23:37:13,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 79 states have (on average 1.1772151898734178) internal successors, (93), 80 states have internal predecessors, (93), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:37:13,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 102 transitions. [2021-05-02 23:37:13,105 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 102 transitions. Word has length 71 [2021-05-02 23:37:13,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:37:13,106 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 102 transitions. [2021-05-02 23:37:13,106 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 66 states, 65 states have (on average 1.0307692307692307) internal successors, (67), 64 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:37:13,106 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 102 transitions. [2021-05-02 23:37:13,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 23:37:13,106 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:37:13,106 INFO L523 BasicCegarLoop]: trace histogram [47, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:37:13,106 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2021-05-02 23:37:13,106 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:37:13,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:37:13,107 INFO L82 PathProgramCache]: Analyzing trace with hash -617385658, now seen corresponding path program 24 times [2021-05-02 23:37:13,107 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:37:13,107 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1397158975] [2021-05-02 23:37:13,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:37:13,118 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1533 v_main_~n~0_62) InVars {main_~i~0=v_main_~i~0_1533, main_~n~0=v_main_~n~0_62} OutVars{main_~i~0=v_main_~i~0_1533, main_~n~0=v_main_~n~0_62} AuxVars[] AssignedVars[] [2021-05-02 23:37:13,121 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:37:13,122 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:37:13,138 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:37:13,194 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:37:13,253 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:37:13,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:37:13,492 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 12 [2021-05-02 23:37:13,712 WARN L205 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2021-05-02 23:37:13,928 WARN L205 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 21 [2021-05-02 23:37:14,085 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:37:14,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:37:14,090 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:37:14,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:37:14,096 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:37:14,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:37:14,101 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:37:14,230 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 22 [2021-05-02 23:37:20,054 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:37:20,054 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1397158975] [2021-05-02 23:37:20,054 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1397158975] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:37:20,054 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:37:20,054 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [59] imperfect sequences [] total 59 [2021-05-02 23:37:20,054 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211623150] [2021-05-02 23:37:20,055 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-02 23:37:20,055 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:37:20,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-02 23:37:20,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=270, Invalid=3390, Unknown=0, NotChecked=0, Total=3660 [2021-05-02 23:37:20,056 INFO L87 Difference]: Start difference. First operand 88 states and 102 transitions. Second operand has 59 states, 58 states have (on average 1.103448275862069) internal successors, (64), 57 states have internal predecessors, (64), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:37:20,329 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 23:37:36,745 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 38 [2021-05-02 23:37:37,824 WARN L205 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 43 [2021-05-02 23:37:38,482 WARN L205 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 36 [2021-05-02 23:37:39,597 WARN L205 SmtUtils]: Spent 310.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 43 [2021-05-02 23:37:40,373 WARN L205 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 23:37:40,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:37:40,378 INFO L93 Difference]: Finished difference Result 112 states and 128 transitions. [2021-05-02 23:37:40,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-05-02 23:37:40,383 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 58 states have (on average 1.103448275862069) internal successors, (64), 57 states have internal predecessors, (64), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 75 [2021-05-02 23:37:40,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:37:40,383 INFO L225 Difference]: With dead ends: 112 [2021-05-02 23:37:40,383 INFO L226 Difference]: Without dead ends: 88 [2021-05-02 23:37:40,384 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2314 ImplicationChecksByTransitivity, 17364.6ms TimeCoverageRelationStatistics Valid=726, Invalid=13080, Unknown=0, NotChecked=0, Total=13806 [2021-05-02 23:37:40,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-05-02 23:37:40,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2021-05-02 23:37:40,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 79 states have (on average 1.1518987341772151) internal successors, (91), 80 states have internal predecessors, (91), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:37:40,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 100 transitions. [2021-05-02 23:37:40,401 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 100 transitions. Word has length 75 [2021-05-02 23:37:40,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:37:40,401 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 100 transitions. [2021-05-02 23:37:40,402 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 58 states have (on average 1.103448275862069) internal successors, (64), 57 states have internal predecessors, (64), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:37:40,402 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 100 transitions. [2021-05-02 23:37:40,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 23:37:40,402 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:37:40,402 INFO L523 BasicCegarLoop]: trace histogram [59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:37:40,402 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2021-05-02 23:37:40,402 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:37:40,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:37:40,402 INFO L82 PathProgramCache]: Analyzing trace with hash 69806246, now seen corresponding path program 30 times [2021-05-02 23:37:40,403 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:37:40,403 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1738198041] [2021-05-02 23:37:40,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:37:40,413 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1583 v_main_~n~0_63) InVars {main_~i~0=v_main_~i~0_1583, main_~n~0=v_main_~n~0_63} OutVars{main_~i~0=v_main_~i~0_1583, main_~n~0=v_main_~n~0_63} AuxVars[] AssignedVars[] [2021-05-02 23:37:40,417 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:37:40,419 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:37:40,443 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:37:40,524 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:37:40,614 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:37:40,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:37:40,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:37:40,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:37:40,929 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:37:41,093 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 22 [2021-05-02 23:37:50,726 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:37:50,727 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1738198041] [2021-05-02 23:37:50,727 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1738198041] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:37:50,727 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:37:50,727 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [68] imperfect sequences [] total 68 [2021-05-02 23:37:50,727 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239396164] [2021-05-02 23:37:50,727 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2021-05-02 23:37:50,727 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:37:50,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-05-02 23:37:50,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=4509, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 23:37:50,728 INFO L87 Difference]: Start difference. First operand 88 states and 100 transitions. Second operand has 68 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 66 states have internal predecessors, (69), 2 states have call successors, (3), 3 states 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 23:37:50,934 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 23:38:08,246 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 42 [2021-05-02 23:38:08,914 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:38:09,268 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:38:10,127 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 41 [2021-05-02 23:38:10,482 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 40 [2021-05-02 23:38:11,333 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:38:11,710 WARN L205 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 43 [2021-05-02 23:38:12,692 WARN L205 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:38:13,112 WARN L205 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 40 [2021-05-02 23:38:13,998 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:38:14,371 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:38:15,232 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 41 [2021-05-02 23:38:15,603 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:38:16,582 WARN L205 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:38:16,957 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 40 [2021-05-02 23:38:17,936 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 41 [2021-05-02 23:38:18,318 WARN L205 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 43 [2021-05-02 23:38:19,179 WARN L205 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:38:19,557 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 42 [2021-05-02 23:38:20,466 WARN L205 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 41 [2021-05-02 23:38:20,826 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 42 [2021-05-02 23:38:21,382 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 33 [2021-05-02 23:38:21,911 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 41 [2021-05-02 23:38:22,460 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 36 [2021-05-02 23:38:24,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:38:24,643 INFO L93 Difference]: Finished difference Result 142 states and 167 transitions. [2021-05-02 23:38:24,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2021-05-02 23:38:24,649 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 66 states have internal predecessors, (69), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 73 [2021-05-02 23:38:24,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:38:24,650 INFO L225 Difference]: With dead ends: 142 [2021-05-02 23:38:24,650 INFO L226 Difference]: Without dead ends: 140 [2021-05-02 23:38:24,652 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4358 ImplicationChecksByTransitivity, 27561.5ms TimeCoverageRelationStatistics Valid=1187, Invalid=23619, Unknown=0, NotChecked=0, Total=24806 [2021-05-02 23:38:24,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-05-02 23:38:24,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 90. [2021-05-02 23:38:24,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 81 states have (on average 1.1728395061728396) internal successors, (95), 82 states have internal predecessors, (95), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:38:24,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 104 transitions. [2021-05-02 23:38:24,670 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 104 transitions. Word has length 73 [2021-05-02 23:38:24,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:38:24,670 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 104 transitions. [2021-05-02 23:38:24,670 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 68 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 66 states have internal predecessors, (69), 2 states have call successors, (3), 3 states 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 23:38:24,670 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 104 transitions. [2021-05-02 23:38:24,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-02 23:38:24,677 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:38:24,677 INFO L523 BasicCegarLoop]: trace histogram [49, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:38:24,677 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2021-05-02 23:38:24,677 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:38:24,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:38:24,678 INFO L82 PathProgramCache]: Analyzing trace with hash -477189434, now seen corresponding path program 25 times [2021-05-02 23:38:24,678 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:38:24,678 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [116860989] [2021-05-02 23:38:24,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:38:24,702 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1645 v_main_~n~0_64) InVars {main_~i~0=v_main_~i~0_1645, main_~n~0=v_main_~n~0_64} OutVars{main_~i~0=v_main_~i~0_1645, main_~n~0=v_main_~n~0_64} AuxVars[] AssignedVars[] [2021-05-02 23:38:24,705 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:38:24,753 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:38:24,784 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:38:24,850 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:38:24,963 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2021-05-02 23:38:24,970 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:38:24,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:38:25,559 WARN L205 SmtUtils]: Spent 305.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 12 [2021-05-02 23:38:25,940 WARN L205 SmtUtils]: Spent 332.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 20 [2021-05-02 23:38:26,320 WARN L205 SmtUtils]: Spent 326.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 21 [2021-05-02 23:38:26,575 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:38:26,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:38:26,581 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:38:26,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:38:26,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:38:26,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:38:26,604 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:38:26,825 WARN L205 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 22 [2021-05-02 23:38:27,199 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 12 [2021-05-02 23:38:38,182 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:38:38,182 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [116860989] [2021-05-02 23:38:38,182 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [116860989] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:38:38,182 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:38:38,183 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [61] imperfect sequences [] total 61 [2021-05-02 23:38:38,183 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109786028] [2021-05-02 23:38:38,183 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2021-05-02 23:38:38,183 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:38:38,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-05-02 23:38:38,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=3557, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 23:38:38,184 INFO L87 Difference]: Start difference. First operand 90 states and 104 transitions. Second operand has 61 states, 60 states have (on average 1.1) internal successors, (66), 59 states have internal predecessors, (66), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:38:38,929 WARN L205 SmtUtils]: Spent 195.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 23:38:58,209 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 38 [2021-05-02 23:38:59,093 WARN L205 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 42 [2021-05-02 23:38:59,594 WARN L205 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 36 [2021-05-02 23:39:00,883 WARN L205 SmtUtils]: Spent 319.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 43 [2021-05-02 23:39:01,785 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 23:39:01,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:39:01,789 INFO L93 Difference]: Finished difference Result 114 states and 130 transitions. [2021-05-02 23:39:01,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-02 23:39:01,792 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 60 states have (on average 1.1) internal successors, (66), 59 states have internal predecessors, (66), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 77 [2021-05-02 23:39:01,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:39:01,793 INFO L225 Difference]: With dead ends: 114 [2021-05-02 23:39:01,793 INFO L226 Difference]: Without dead ends: 90 [2021-05-02 23:39:01,794 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2388 ImplicationChecksByTransitivity, 24564.3ms TimeCoverageRelationStatistics Valid=643, Invalid=13877, Unknown=0, NotChecked=0, Total=14520 [2021-05-02 23:39:01,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-02 23:39:01,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2021-05-02 23:39:01,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 81 states have (on average 1.1481481481481481) internal successors, (93), 82 states have internal predecessors, (93), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:39:01,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 102 transitions. [2021-05-02 23:39:01,811 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 102 transitions. Word has length 77 [2021-05-02 23:39:01,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:39:01,811 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 102 transitions. [2021-05-02 23:39:01,811 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 61 states, 60 states have (on average 1.1) internal successors, (66), 59 states have internal predecessors, (66), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:39:01,811 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 102 transitions. [2021-05-02 23:39:01,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 23:39:01,811 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:39:01,812 INFO L523 BasicCegarLoop]: trace histogram [61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:39:01,812 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2021-05-02 23:39:01,812 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:39:01,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:39:01,812 INFO L82 PathProgramCache]: Analyzing trace with hash -721108442, now seen corresponding path program 31 times [2021-05-02 23:39:01,812 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:39:01,812 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [181837355] [2021-05-02 23:39:01,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:39:01,827 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1697 v_main_~n~0_65) InVars {main_~i~0=v_main_~i~0_1697, main_~n~0=v_main_~n~0_65} OutVars{main_~i~0=v_main_~i~0_1697, main_~n~0=v_main_~n~0_65} AuxVars[] AssignedVars[] [2021-05-02 23:39:01,830 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:39:01,860 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:39:01,875 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:39:01,906 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:39:01,970 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:39:01,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:39:02,240 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:39:02,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:39:02,246 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:39:02,404 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 22 [2021-05-02 23:39:02,581 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2021-05-02 23:39:17,365 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:39:17,365 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [181837355] [2021-05-02 23:39:17,365 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [181837355] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:39:17,365 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:39:17,365 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [70] imperfect sequences [] total 70 [2021-05-02 23:39:17,365 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [334693139] [2021-05-02 23:39:17,366 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2021-05-02 23:39:17,366 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:39:17,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-05-02 23:39:17,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=4706, Unknown=0, NotChecked=0, Total=4970 [2021-05-02 23:39:17,367 INFO L87 Difference]: Start difference. First operand 90 states and 102 transitions. Second operand has 70 states, 69 states have (on average 1.0289855072463767) internal successors, (71), 68 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:39:17,668 WARN L205 SmtUtils]: Spent 195.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 23:39:43,943 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 40 [2021-05-02 23:39:44,891 WARN L205 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:39:45,462 WARN L205 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 43 [2021-05-02 23:39:46,780 WARN L205 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:39:47,334 WARN L205 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 40 [2021-05-02 23:39:48,790 WARN L205 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:39:49,365 WARN L205 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:39:50,871 WARN L205 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 41 [2021-05-02 23:39:51,419 WARN L205 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:39:52,753 WARN L205 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:39:53,324 WARN L205 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 40 [2021-05-02 23:39:54,652 WARN L205 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 41 [2021-05-02 23:39:55,236 WARN L205 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 40 [2021-05-02 23:39:56,759 WARN L205 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:39:57,329 WARN L205 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 42 [2021-05-02 23:39:59,000 WARN L205 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 41 [2021-05-02 23:39:59,596 WARN L205 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 42 [2021-05-02 23:40:01,041 WARN L205 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 41 [2021-05-02 23:40:01,632 WARN L205 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 40 [2021-05-02 23:40:03,156 WARN L205 SmtUtils]: Spent 295.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 41 [2021-05-02 23:40:03,858 WARN L205 SmtUtils]: Spent 289.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 43 [2021-05-02 23:40:04,854 WARN L205 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 33 [2021-05-02 23:40:05,702 WARN L205 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 41 [2021-05-02 23:40:06,500 WARN L205 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 36 [2021-05-02 23:40:08,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:40:08,933 INFO L93 Difference]: Finished difference Result 144 states and 169 transitions. [2021-05-02 23:40:08,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2021-05-02 23:40:08,939 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 69 states have (on average 1.0289855072463767) internal successors, (71), 68 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 75 [2021-05-02 23:40:08,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:40:08,940 INFO L225 Difference]: With dead ends: 144 [2021-05-02 23:40:08,940 INFO L226 Difference]: Without dead ends: 142 [2021-05-02 23:40:08,948 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4479 ImplicationChecksByTransitivity, 41520.2ms TimeCoverageRelationStatistics Valid=1062, Invalid=24698, Unknown=0, NotChecked=0, Total=25760 [2021-05-02 23:40:08,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-05-02 23:40:08,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 92. [2021-05-02 23:40:08,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 83 states have (on average 1.1686746987951808) internal successors, (97), 84 states have internal predecessors, (97), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:40:08,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 106 transitions. [2021-05-02 23:40:08,967 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 106 transitions. Word has length 75 [2021-05-02 23:40:08,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:40:08,968 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 106 transitions. [2021-05-02 23:40:08,968 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 70 states, 69 states have (on average 1.0289855072463767) internal successors, (71), 68 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:40:08,968 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 106 transitions. [2021-05-02 23:40:08,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-02 23:40:08,968 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:40:08,969 INFO L523 BasicCegarLoop]: trace histogram [51, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:40:08,969 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2021-05-02 23:40:08,969 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:40:08,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:40:08,969 INFO L82 PathProgramCache]: Analyzing trace with hash 1107395654, now seen corresponding path program 26 times [2021-05-02 23:40:08,969 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:40:08,969 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [13184591] [2021-05-02 23:40:08,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:40:08,993 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1761 v_main_~n~0_66) InVars {main_~i~0=v_main_~i~0_1761, main_~n~0=v_main_~n~0_66} OutVars{main_~i~0=v_main_~i~0_1761, main_~n~0=v_main_~n~0_66} AuxVars[] AssignedVars[] [2021-05-02 23:40:08,997 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:40:09,000 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:40:09,031 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:40:09,154 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:40:09,279 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2021-05-02 23:40:09,286 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:40:09,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:40:09,942 WARN L205 SmtUtils]: Spent 361.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 12 [2021-05-02 23:40:10,411 WARN L205 SmtUtils]: Spent 401.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 20 [2021-05-02 23:40:10,860 WARN L205 SmtUtils]: Spent 391.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 21 [2021-05-02 23:40:11,134 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:40:11,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:40:11,141 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:40:11,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:40:11,147 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:40:11,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:40:11,155 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:40:11,402 WARN L205 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 22 [2021-05-02 23:40:19,277 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:40:19,278 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [13184591] [2021-05-02 23:40:19,278 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [13184591] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:40:19,278 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:40:19,278 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [63] imperfect sequences [] total 63 [2021-05-02 23:40:19,278 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1673964452] [2021-05-02 23:40:19,278 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-02 23:40:19,278 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:40:19,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-02 23:40:19,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=3799, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 23:40:19,279 INFO L87 Difference]: Start difference. First operand 92 states and 106 transitions. Second operand has 63 states, 62 states have (on average 1.096774193548387) internal successors, (68), 61 states have internal predecessors, (68), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:40:19,515 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 23:40:37,499 WARN L205 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 40 [2021-05-02 23:40:38,065 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 33 [2021-05-02 23:40:38,921 WARN L205 SmtUtils]: Spent 368.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 42 [2021-05-02 23:40:39,711 WARN L205 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 36 [2021-05-02 23:40:40,462 WARN L205 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 43 [2021-05-02 23:40:40,962 WARN L205 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 23:40:40,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:40:40,969 INFO L93 Difference]: Finished difference Result 116 states and 132 transitions. [2021-05-02 23:40:40,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-05-02 23:40:40,974 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 62 states have (on average 1.096774193548387) internal successors, (68), 61 states have internal predecessors, (68), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 79 [2021-05-02 23:40:40,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:40:40,975 INFO L225 Difference]: With dead ends: 116 [2021-05-02 23:40:40,975 INFO L226 Difference]: Without dead ends: 92 [2021-05-02 23:40:40,976 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2533 ImplicationChecksByTransitivity, 21389.8ms TimeCoverageRelationStatistics Valid=665, Invalid=14835, Unknown=0, NotChecked=0, Total=15500 [2021-05-02 23:40:40,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-02 23:40:40,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2021-05-02 23:40:40,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 83 states have (on average 1.144578313253012) internal successors, (95), 84 states have internal predecessors, (95), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:40:40,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 104 transitions. [2021-05-02 23:40:40,994 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 104 transitions. Word has length 79 [2021-05-02 23:40:40,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:40:40,994 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 104 transitions. [2021-05-02 23:40:40,994 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 63 states, 62 states have (on average 1.096774193548387) internal successors, (68), 61 states have internal predecessors, (68), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:40:40,994 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 104 transitions. [2021-05-02 23:40:40,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-02 23:40:40,994 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:40:40,994 INFO L523 BasicCegarLoop]: trace histogram [63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:40:40,995 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2021-05-02 23:40:40,995 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:40:40,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:40:40,995 INFO L82 PathProgramCache]: Analyzing trace with hash -580912218, now seen corresponding path program 32 times [2021-05-02 23:40:40,995 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:40:40,995 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [140727748] [2021-05-02 23:40:40,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:40:41,007 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1815 v_main_~n~0_67) InVars {main_~i~0=v_main_~i~0_1815, main_~n~0=v_main_~n~0_67} OutVars{main_~i~0=v_main_~i~0_1815, main_~n~0=v_main_~n~0_67} AuxVars[] AssignedVars[] [2021-05-02 23:40:41,010 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:40:41,012 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:40:41,033 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:40:41,111 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:40:41,194 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:40:41,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:40:41,497 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:40:41,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:40:41,503 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:40:41,660 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 22 [2021-05-02 23:40:53,508 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:40:53,508 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [140727748] [2021-05-02 23:40:53,508 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [140727748] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:40:53,508 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:40:53,508 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [72] imperfect sequences [] total 72 [2021-05-02 23:40:53,508 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [286951202] [2021-05-02 23:40:53,508 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2021-05-02 23:40:53,509 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:40:53,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-05-02 23:40:53,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=272, Invalid=4984, Unknown=0, NotChecked=0, Total=5256 [2021-05-02 23:40:53,509 INFO L87 Difference]: Start difference. First operand 92 states and 104 transitions. Second operand has 72 states, 71 states have (on average 1.028169014084507) internal successors, (73), 70 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:40:54,119 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 23:41:18,147 WARN L205 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 40 [2021-05-02 23:41:19,086 WARN L205 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 46 [2021-05-02 23:41:19,586 WARN L205 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:41:20,738 WARN L205 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 45 [2021-05-02 23:41:21,199 WARN L205 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:41:22,382 WARN L205 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:41:22,864 WARN L205 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 40 [2021-05-02 23:41:24,309 WARN L205 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:41:24,761 WARN L205 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 38 [2021-05-02 23:41:26,088 WARN L205 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:41:26,522 WARN L205 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 38 [2021-05-02 23:41:27,778 WARN L205 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:41:28,231 WARN L205 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 38 [2021-05-02 23:41:29,412 WARN L205 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:41:29,862 WARN L205 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 38 [2021-05-02 23:41:31,376 WARN L205 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 45 [2021-05-02 23:41:31,829 WARN L205 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 40 [2021-05-02 23:41:32,959 WARN L205 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:41:33,402 WARN L205 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 38 [2021-05-02 23:41:34,464 WARN L205 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:41:34,917 WARN L205 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 38 [2021-05-02 23:41:35,639 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 33 [2021-05-02 23:41:36,268 WARN L205 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:41:36,847 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 36 [2021-05-02 23:41:40,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:41:40,594 INFO L93 Difference]: Finished difference Result 146 states and 171 transitions. [2021-05-02 23:41:40,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2021-05-02 23:41:40,598 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 71 states have (on average 1.028169014084507) internal successors, (73), 70 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2021-05-02 23:41:40,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:41:40,599 INFO L225 Difference]: With dead ends: 146 [2021-05-02 23:41:40,599 INFO L226 Difference]: Without dead ends: 144 [2021-05-02 23:41:40,600 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4676 ImplicationChecksByTransitivity, 34723.2ms TimeCoverageRelationStatistics Valid=1086, Invalid=25974, Unknown=0, NotChecked=0, Total=27060 [2021-05-02 23:41:40,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-05-02 23:41:40,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 94. [2021-05-02 23:41:40,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 85 states have (on average 1.1647058823529413) internal successors, (99), 86 states have internal predecessors, (99), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:41:40,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 108 transitions. [2021-05-02 23:41:40,617 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 108 transitions. Word has length 77 [2021-05-02 23:41:40,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:41:40,617 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 108 transitions. [2021-05-02 23:41:40,617 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 72 states, 71 states have (on average 1.028169014084507) internal successors, (73), 70 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:41:40,617 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 108 transitions. [2021-05-02 23:41:40,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-02 23:41:40,618 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:41:40,618 INFO L523 BasicCegarLoop]: trace histogram [53, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:41:40,618 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2021-05-02 23:41:40,618 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:41:40,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:41:40,618 INFO L82 PathProgramCache]: Analyzing trace with hash -819724858, now seen corresponding path program 27 times [2021-05-02 23:41:40,618 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:41:40,619 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [961954323] [2021-05-02 23:41:40,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:41:40,628 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1881 v_main_~n~0_68) InVars {main_~i~0=v_main_~i~0_1881, main_~n~0=v_main_~n~0_68} OutVars{main_~i~0=v_main_~i~0_1881, main_~n~0=v_main_~n~0_68} AuxVars[] AssignedVars[] [2021-05-02 23:41:40,630 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:41:40,662 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:41:40,682 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:41:40,731 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:41:40,816 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:41:40,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:41:41,238 WARN L205 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 12 [2021-05-02 23:41:41,531 WARN L205 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 20 [2021-05-02 23:41:41,823 WARN L205 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 21 [2021-05-02 23:41:42,002 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:41:42,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:41:42,007 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:41:42,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:41:42,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:41:42,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:41:42,034 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:41:42,197 WARN L205 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 22 [2021-05-02 23:41:52,427 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:41:52,427 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [961954323] [2021-05-02 23:41:52,427 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [961954323] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:41:52,428 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:41:52,428 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [65] imperfect sequences [] total 65 [2021-05-02 23:41:52,428 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509262857] [2021-05-02 23:41:52,428 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-02 23:41:52,428 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:41:52,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-02 23:41:52,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=4049, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 23:41:52,429 INFO L87 Difference]: Start difference. First operand 94 states and 108 transitions. Second operand has 65 states, 64 states have (on average 1.09375) internal successors, (70), 63 states have internal predecessors, (70), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:41:53,161 WARN L205 SmtUtils]: Spent 216.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 23:41:54,051 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 23:42:20,869 WARN L205 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 40 [2021-05-02 23:42:21,570 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 33 [2021-05-02 23:42:22,272 WARN L205 SmtUtils]: Spent 304.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 46 [2021-05-02 23:42:23,024 WARN L205 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 36 [2021-05-02 23:42:24,274 WARN L205 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 43 [2021-05-02 23:42:25,274 WARN L205 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 23:42:25,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:42:25,281 INFO L93 Difference]: Finished difference Result 118 states and 134 transitions. [2021-05-02 23:42:25,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-05-02 23:42:25,286 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 64 states have (on average 1.09375) internal successors, (70), 63 states have internal predecessors, (70), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 81 [2021-05-02 23:42:25,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:42:25,287 INFO L225 Difference]: With dead ends: 118 [2021-05-02 23:42:25,287 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 23:42:25,288 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2682 ImplicationChecksByTransitivity, 27726.0ms TimeCoverageRelationStatistics Valid=687, Invalid=15825, Unknown=0, NotChecked=0, Total=16512 [2021-05-02 23:42:25,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 23:42:25,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2021-05-02 23:42:25,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 85 states have (on average 1.1411764705882352) internal successors, (97), 86 states have internal predecessors, (97), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:42:25,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 106 transitions. [2021-05-02 23:42:25,306 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 106 transitions. Word has length 81 [2021-05-02 23:42:25,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:42:25,306 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 106 transitions. [2021-05-02 23:42:25,306 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 64 states have (on average 1.09375) internal successors, (70), 63 states have internal predecessors, (70), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:42:25,306 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 106 transitions. [2021-05-02 23:42:25,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-02 23:42:25,306 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:42:25,307 INFO L523 BasicCegarLoop]: trace histogram [65, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:42:25,307 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2021-05-02 23:42:25,307 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:42:25,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:42:25,307 INFO L82 PathProgramCache]: Analyzing trace with hash 1003672870, now seen corresponding path program 33 times [2021-05-02 23:42:25,307 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:42:25,307 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [893239591] [2021-05-02 23:42:25,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:42:25,318 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1937 v_main_~n~0_69) InVars {main_~i~0=v_main_~i~0_1937, main_~n~0=v_main_~n~0_69} OutVars{main_~i~0=v_main_~i~0_1937, main_~n~0=v_main_~n~0_69} AuxVars[] AssignedVars[] [2021-05-02 23:42:25,322 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:42:25,362 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:42:25,384 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:42:25,430 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:42:25,517 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:42:25,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:42:25,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:42:25,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:42:25,806 INFO 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 23:42:25,997 WARN L205 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 22 [2021-05-02 23:42:39,466 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:42:39,466 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [893239591] [2021-05-02 23:42:39,466 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [893239591] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:42:39,466 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:42:39,466 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [74] imperfect sequences [] total 74 [2021-05-02 23:42:39,466 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55175007] [2021-05-02 23:42:39,467 INFO L460 AbstractCegarLoop]: Interpolant automaton has 74 states [2021-05-02 23:42:39,467 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:42:39,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-05-02 23:42:39,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=5270, Unknown=0, NotChecked=0, Total=5550 [2021-05-02 23:42:39,467 INFO L87 Difference]: Start difference. First operand 94 states and 106 transitions. Second operand has 74 states, 73 states have (on average 1.0273972602739727) internal successors, (75), 72 states have internal predecessors, (75), 2 states have call successors, (3), 3 states 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 23:42:39,820 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 23:42:50,442 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 23:42:52,452 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-02 23:42:55,124 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 23:42:56,452 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 23:42:59,040 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 23:43:00,391 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 23:43:01,074 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 23:43:01,770 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-02 23:43:03,088 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 23:43:03,848 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 23:43:10,431 WARN L205 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:43:11,451 WARN L205 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:43:11,956 WARN L205 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 40 [2021-05-02 23:43:13,230 WARN L205 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:43:13,905 WARN L205 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 38 [2021-05-02 23:43:15,631 WARN L205 SmtUtils]: Spent 293.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 44 [2021-05-02 23:43:16,241 WARN L205 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 38 [2021-05-02 23:43:16,862 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2021-05-02 23:43:18,151 WARN L205 SmtUtils]: Spent 308.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 43 [2021-05-02 23:43:18,847 WARN L205 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 42 [2021-05-02 23:43:20,618 WARN L205 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:43:21,211 WARN L205 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 38 [2021-05-02 23:43:22,806 WARN L205 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:43:23,421 WARN L205 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 43 [2021-05-02 23:43:25,169 WARN L205 SmtUtils]: Spent 288.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 44 [2021-05-02 23:43:25,763 WARN L205 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:43:27,806 WARN L205 SmtUtils]: Spent 292.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:43:28,476 WARN L205 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 38 [2021-05-02 23:43:30,110 WARN L205 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:43:30,735 WARN L205 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 38 [2021-05-02 23:43:32,291 WARN L205 SmtUtils]: Spent 287.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 42 [2021-05-02 23:43:32,952 WARN L205 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 38 [2021-05-02 23:43:34,057 WARN L205 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 33 [2021-05-02 23:43:34,993 WARN L205 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 41 [2021-05-02 23:43:35,813 WARN L205 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 36 [2021-05-02 23:43:39,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:43:39,251 INFO L93 Difference]: Finished difference Result 148 states and 173 transitions. [2021-05-02 23:43:39,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2021-05-02 23:43:39,257 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 73 states have (on average 1.0273972602739727) internal successors, (75), 72 states have internal predecessors, (75), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 79 [2021-05-02 23:43:39,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:43:39,258 INFO L225 Difference]: With dead ends: 148 [2021-05-02 23:43:39,258 INFO L226 Difference]: Without dead ends: 146 [2021-05-02 23:43:39,259 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4877 ImplicationChecksByTransitivity, 43206.0ms TimeCoverageRelationStatistics Valid=1110, Invalid=27282, Unknown=0, NotChecked=0, Total=28392 [2021-05-02 23:43:39,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-05-02 23:43:39,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 96. [2021-05-02 23:43:39,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 87 states have (on average 1.160919540229885) internal successors, (101), 88 states have internal predecessors, (101), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:43:39,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 110 transitions. [2021-05-02 23:43:39,285 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 110 transitions. Word has length 79 [2021-05-02 23:43:39,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:43:39,285 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 110 transitions. [2021-05-02 23:43:39,285 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 74 states, 73 states have (on average 1.0273972602739727) internal successors, (75), 72 states have internal predecessors, (75), 2 states have call successors, (3), 3 states 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 23:43:39,285 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 110 transitions. [2021-05-02 23:43:39,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 23:43:39,285 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:43:39,286 INFO L523 BasicCegarLoop]: trace histogram [55, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:43:39,286 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2021-05-02 23:43:39,286 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:43:39,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:43:39,286 INFO L82 PathProgramCache]: Analyzing trace with hash -1651632314, now seen corresponding path program 28 times [2021-05-02 23:43:39,286 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:43:39,286 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [632155632] [2021-05-02 23:43:39,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:43:39,297 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2005 v_main_~n~0_70) InVars {main_~i~0=v_main_~i~0_2005, main_~n~0=v_main_~n~0_70} OutVars{main_~i~0=v_main_~i~0_2005, main_~n~0=v_main_~n~0_70} AuxVars[] AssignedVars[] [2021-05-02 23:43:39,300 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:43:39,342 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:43:39,365 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:43:39,426 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:43:39,535 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2021-05-02 23:43:39,541 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:43:39,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:40,010 WARN L205 SmtUtils]: Spent 289.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 14 [2021-05-02 23:43:40,421 WARN L205 SmtUtils]: Spent 357.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 28 [2021-05-02 23:43:40,848 WARN L205 SmtUtils]: Spent 353.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 29 [2021-05-02 23:43:41,056 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:43:41,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:41,062 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 23:43:41,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:41,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 23:43:41,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:41,084 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 23:43:41,265 WARN L205 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 22 [2021-05-02 23:43:54,652 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:43:54,653 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [632155632] [2021-05-02 23:43:54,653 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [632155632] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:43:54,653 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:43:54,653 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [67] imperfect sequences [] total 67 [2021-05-02 23:43:54,653 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409840620] [2021-05-02 23:43:54,653 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2021-05-02 23:43:54,653 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:43:54,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-05-02 23:43:54,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=4307, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 23:43:54,654 INFO L87 Difference]: Start difference. First operand 96 states and 110 transitions. Second operand has 67 states, 66 states have (on average 1.0909090909090908) internal successors, (72), 65 states have internal predecessors, (72), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:43:55,082 WARN L205 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 23:44:22,315 WARN L205 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:44:23,153 WARN L205 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 33 [2021-05-02 23:44:23,935 WARN L205 SmtUtils]: Spent 288.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 42 [2021-05-02 23:44:24,721 WARN L205 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 36 [2021-05-02 23:44:25,773 WARN L205 SmtUtils]: Spent 351.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 43 [2021-05-02 23:44:26,559 WARN L205 SmtUtils]: Spent 246.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-02 23:44:26,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:44:26,567 INFO L93 Difference]: Finished difference Result 120 states and 136 transitions. [2021-05-02 23:44:26,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-05-02 23:44:26,572 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 66 states have (on average 1.0909090909090908) internal successors, (72), 65 states have internal predecessors, (72), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 83 [2021-05-02 23:44:26,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:44:26,572 INFO L225 Difference]: With dead ends: 120 [2021-05-02 23:44:26,572 INFO L226 Difference]: Without dead ends: 96 [2021-05-02 23:44:26,574 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2835 ImplicationChecksByTransitivity, 31334.2ms TimeCoverageRelationStatistics Valid=709, Invalid=16847, Unknown=0, NotChecked=0, Total=17556 [2021-05-02 23:44:26,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-02 23:44:26,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2021-05-02 23:44:26,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 87 states have (on average 1.1379310344827587) internal successors, (99), 88 states have internal predecessors, (99), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 23:44:26,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 108 transitions. [2021-05-02 23:44:26,591 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 108 transitions. Word has length 83 [2021-05-02 23:44:26,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:44:26,591 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 108 transitions. [2021-05-02 23:44:26,591 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 67 states, 66 states have (on average 1.0909090909090908) internal successors, (72), 65 states have internal predecessors, (72), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:44:26,592 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 108 transitions. [2021-05-02 23:44:26,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-02 23:44:26,592 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:44:26,592 INFO L523 BasicCegarLoop]: trace histogram [67, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:44:26,592 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2021-05-02 23:44:26,592 INFO L428 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:44:26,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:44:26,592 INFO L82 PathProgramCache]: Analyzing trace with hash -923447642, now seen corresponding path program 34 times [2021-05-02 23:44:26,593 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:44:26,593 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1212706777] [2021-05-02 23:44:26,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:44:26,605 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2063 v_main_~n~0_71) InVars {main_~i~0=v_main_~i~0_2063, main_~n~0=v_main_~n~0_71} OutVars{main_~i~0=v_main_~i~0_2063, main_~n~0=v_main_~n~0_71} AuxVars[] AssignedVars[] [2021-05-02 23:44:26,609 WARN L240 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size [2021-05-02 23:44:26,659 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:44:26,685 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-02 23:44:26,742 WARN L245 tifierPushTermWalker]: treesize reduction 9, result has 87.1 percent of original size 61 [2021-05-02 23:44:26,844 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2021-05-02 23:44:26,850 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:44:26,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:27,155 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 15 [2021-05-02 23:44:27,337 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:44:27,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:27,346 INFO 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 23:44:27,567 WARN L205 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 22