/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/string_concat-noarr.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 11:35:28,141 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 11:35:28,143 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 11:35:28,173 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 11:35:28,188 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 11:35:28,189 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 11:35:28,190 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 11:35:28,191 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 11:35:28,193 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 11:35:28,193 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 11:35:28,195 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 11:35:28,199 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 11:35:28,199 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 11:35:28,202 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 11:35:28,202 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 11:35:28,204 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 11:35:28,208 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 11:35:28,214 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 11:35:28,214 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 11:35:28,215 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 11:35:28,218 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-06 11:35:28,229 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 11:35:28,229 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 11:35:28,231 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 11:35:28,232 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 11:35:28,232 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 11:35:28,232 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 11:35:28,232 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 11:35:28,232 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 11:35:28,232 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 11:35:28,232 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 11:35:28,233 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 11:35:28,233 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 11:35:28,233 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 11:35:28,233 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 11:35:28,233 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 11:35:28,233 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 11:35:28,234 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 11:35:28,234 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 11:35:28,234 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:35:28,234 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 11:35:28,234 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 11:35:28,234 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 11:35:28,234 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 11:35:28,234 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 11:35:28,504 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 11:35:28,517 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 11:35:28,519 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 11:35:28,519 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 11:35:28,520 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 11:35:28,520 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/string_concat-noarr.i [2021-05-06 11:35:28,562 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/32ba91851/b6c9496cd1174969bdd56623a2ea327c/FLAG3fa197288 [2021-05-06 11:35:28,942 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 11:35:28,942 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/string_concat-noarr.i [2021-05-06 11:35:28,947 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/32ba91851/b6c9496cd1174969bdd56623a2ea327c/FLAG3fa197288 [2021-05-06 11:35:29,308 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/32ba91851/b6c9496cd1174969bdd56623a2ea327c [2021-05-06 11:35:29,310 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 11:35:29,311 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 11:35:29,329 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 11:35:29,329 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 11:35:29,331 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 11:35:29,332 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:35:29" (1/1) ... [2021-05-06 11:35:29,333 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@47f8f271 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:35:29, skipping insertion in model container [2021-05-06 11:35:29,333 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:35:29" (1/1) ... [2021-05-06 11:35:29,338 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 11:35:29,365 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 11:35:29,551 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/string_concat-noarr.i[893,906] [2021-05-06 11:35:29,562 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:35:29,568 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 11:35:29,595 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/string_concat-noarr.i[893,906] [2021-05-06 11:35:29,600 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:35:29,610 INFO L208 MainTranslator]: Completed translation [2021-05-06 11:35:29,611 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:35:29 WrapperNode [2021-05-06 11:35:29,611 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 11:35:29,613 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 11:35:29,613 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 11:35:29,613 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 11:35:29,621 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:35:29" (1/1) ... [2021-05-06 11:35:29,621 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:35:29" (1/1) ... [2021-05-06 11:35:29,626 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:35:29" (1/1) ... [2021-05-06 11:35:29,626 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:35:29" (1/1) ... [2021-05-06 11:35:29,668 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:35:29" (1/1) ... [2021-05-06 11:35:29,671 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:35:29" (1/1) ... [2021-05-06 11:35:29,677 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:35:29" (1/1) ... [2021-05-06 11:35:29,678 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 11:35:29,679 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 11:35:29,679 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 11:35:29,679 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 11:35:29,680 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:35:29" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:35:29,731 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 11:35:29,732 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 11:35:29,732 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 11:35:29,732 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 11:35:29,732 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 11:35:29,732 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 11:35:29,732 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 11:35:29,733 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 11:35:29,733 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-06 11:35:29,733 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-06 11:35:29,733 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 11:35:29,733 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 11:35:29,733 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 11:35:29,733 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 11:35:29,734 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-06 11:35:29,734 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 11:35:29,734 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 11:35:29,734 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 11:35:29,734 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 11:35:29,735 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 11:35:29,735 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 11:35:29,735 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 11:35:29,956 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 11:35:29,957 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 11:35:29,958 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:35:29 BoogieIcfgContainer [2021-05-06 11:35:29,958 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 11:35:29,959 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 11:35:29,959 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 11:35:29,960 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 11:35:29,961 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 11:35:29" (1/3) ... [2021-05-06 11:35:29,961 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6bfc5f25 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:35:29, skipping insertion in model container [2021-05-06 11:35:29,961 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:35:29" (2/3) ... [2021-05-06 11:35:29,961 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6bfc5f25 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:35:29, skipping insertion in model container [2021-05-06 11:35:29,962 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:35:29" (3/3) ... [2021-05-06 11:35:29,962 INFO L111 eAbstractionObserver]: Analyzing ICFG string_concat-noarr.i [2021-05-06 11:35:29,982 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 11:35:29,984 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 11:35:29,994 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 11:35:30,022 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 11:35:30,022 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 11:35:30,022 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 11:35:30,022 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 11:35:30,022 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 11:35:30,022 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 11:35:30,022 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 11:35:30,022 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 11:35:30,047 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 19 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:35:30,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-06 11:35:30,051 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:30,052 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:30,052 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:30,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:30,055 INFO L82 PathProgramCache]: Analyzing trace with hash -623416428, now seen corresponding path program 1 times [2021-05-06 11:35:30,060 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:30,060 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [834115512] [2021-05-06 11:35:30,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:30,128 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:35:30,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:30,257 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:30,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:30,283 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:30,284 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:30,284 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [834115512] [2021-05-06 11:35:30,286 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [834115512] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:30,286 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:30,286 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 11:35:30,287 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988315251] [2021-05-06 11:35:30,290 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 11:35:30,290 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:30,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 11:35:30,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:35:30,299 INFO L87 Difference]: Start difference. First operand has 26 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 19 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:30,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:30,350 INFO L93 Difference]: Finished difference Result 43 states and 54 transitions. [2021-05-06 11:35:30,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 11:35:30,352 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-06 11:35:30,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:30,356 INFO L225 Difference]: With dead ends: 43 [2021-05-06 11:35:30,356 INFO L226 Difference]: Without dead ends: 18 [2021-05-06 11:35:30,358 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 34.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:35:30,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-05-06 11:35:30,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-05-06 11:35:30,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 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), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:30,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2021-05-06 11:35:30,384 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 15 [2021-05-06 11:35:30,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:30,384 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2021-05-06 11:35:30,385 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:30,385 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2021-05-06 11:35:30,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 11:35:30,386 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:30,386 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:30,386 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 11:35:30,386 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:30,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:30,387 INFO L82 PathProgramCache]: Analyzing trace with hash -1308012743, now seen corresponding path program 1 times [2021-05-06 11:35:30,387 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:30,388 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2017934870] [2021-05-06 11:35:30,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:30,395 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:35:30,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:30,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:30,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:30,518 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:30,519 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:30,519 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2017934870] [2021-05-06 11:35:30,520 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2017934870] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:30,520 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:30,520 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 11:35:30,521 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843455457] [2021-05-06 11:35:30,522 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 11:35:30,522 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:30,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 11:35:30,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:35:30,524 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:30,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:30,679 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2021-05-06 11:35:30,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 11:35:30,680 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-06 11:35:30,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:30,680 INFO L225 Difference]: With dead ends: 29 [2021-05-06 11:35:30,681 INFO L226 Difference]: Without dead ends: 23 [2021-05-06 11:35:30,681 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 106.5ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:35:30,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-06 11:35:30,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2021-05-06 11:35:30,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:30,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-05-06 11:35:30,686 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2021-05-06 11:35:30,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:30,686 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-05-06 11:35:30,686 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:30,686 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-05-06 11:35:30,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-06 11:35:30,686 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:30,687 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:30,687 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 11:35:30,687 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:30,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:30,687 INFO L82 PathProgramCache]: Analyzing trace with hash 1066675892, now seen corresponding path program 1 times [2021-05-06 11:35:30,687 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:30,687 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [315838315] [2021-05-06 11:35:30,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:30,733 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.9 percent of original size [2021-05-06 11:35:30,775 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:30,776 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:30,789 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:30,797 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:30,817 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.9 percent of original size 94 [2021-05-06 11:35:30,846 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 3 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:30,852 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:30,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:30,981 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:30,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:30,986 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:30,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:31,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:31,085 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:31,085 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [315838315] [2021-05-06 11:35:31,085 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [315838315] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:31,085 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:31,085 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:35:31,085 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24518129] [2021-05-06 11:35:31,086 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:35:31,086 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:31,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:35:31,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:35:31,086 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:31,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:31,512 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2021-05-06 11:35:31,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:35:31,513 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-06 11:35:31,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:31,513 INFO L225 Difference]: With dead ends: 39 [2021-05-06 11:35:31,513 INFO L226 Difference]: Without dead ends: 25 [2021-05-06 11:35:31,514 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 429.7ms TimeCoverageRelationStatistics Valid=110, Invalid=352, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:35:31,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-06 11:35:31,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2021-05-06 11:35:31,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:31,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-05-06 11:35:31,518 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 19 [2021-05-06 11:35:31,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:31,518 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-05-06 11:35:31,518 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:31,519 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-05-06 11:35:31,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-06 11:35:31,519 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:31,519 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:31,519 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 11:35:31,519 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:31,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:31,520 INFO L82 PathProgramCache]: Analyzing trace with hash 772441593, now seen corresponding path program 1 times [2021-05-06 11:35:31,520 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:31,520 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [259627519] [2021-05-06 11:35:31,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:31,528 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:35:31,549 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:31,550 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:31,555 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:31,561 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:31,573 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:35:31,591 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:31,593 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:31,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:31,635 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:31,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:31,638 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:31,640 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:31,641 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:31,652 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:31,665 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:31,665 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [259627519] [2021-05-06 11:35:31,665 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [259627519] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:31,665 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:31,665 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:35:31,666 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013687551] [2021-05-06 11:35:31,666 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:35:31,666 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:31,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:35:31,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:35:31,666 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 7 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) [2021-05-06 11:35:31,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:31,849 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2021-05-06 11:35:31,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:35:31,850 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 7 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 [2021-05-06 11:35:31,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:31,850 INFO L225 Difference]: With dead ends: 33 [2021-05-06 11:35:31,850 INFO L226 Difference]: Without dead ends: 27 [2021-05-06 11:35:31,851 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 165.3ms TimeCoverageRelationStatistics Valid=73, Invalid=199, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:35:31,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-06 11:35:31,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2021-05-06 11:35:31,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:31,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-05-06 11:35:31,854 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 21 [2021-05-06 11:35:31,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:31,854 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-05-06 11:35:31,855 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 7 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) [2021-05-06 11:35:31,855 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-05-06 11:35:31,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-06 11:35:31,855 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:31,855 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:31,855 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 11:35:31,855 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:31,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:31,856 INFO L82 PathProgramCache]: Analyzing trace with hash -1071467148, now seen corresponding path program 2 times [2021-05-06 11:35:31,856 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:31,856 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1271538432] [2021-05-06 11:35:31,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:31,862 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:35:31,864 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:31,864 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:31,869 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:31,874 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:31,899 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:35:31,915 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:31,925 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:31,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:31,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:31,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:31,973 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:31,975 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:31,976 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:31,987 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:32,001 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:32,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1271538432] [2021-05-06 11:35:32,001 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1271538432] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:32,001 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:32,001 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:35:32,002 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1309122076] [2021-05-06 11:35:32,002 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:35:32,002 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:32,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:35:32,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:35:32,002 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 10 states, 10 states have (on average 1.9) internal successors, (19), 8 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:32,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:32,224 INFO L93 Difference]: Finished difference Result 38 states and 41 transitions. [2021-05-06 11:35:32,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:35:32,224 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.9) internal successors, (19), 8 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 [2021-05-06 11:35:32,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:32,225 INFO L225 Difference]: With dead ends: 38 [2021-05-06 11:35:32,225 INFO L226 Difference]: Without dead ends: 32 [2021-05-06 11:35:32,225 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 198.5ms TimeCoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:35:32,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-06 11:35:32,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 26. [2021-05-06 11:35:32,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 21 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:32,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2021-05-06 11:35:32,229 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 23 [2021-05-06 11:35:32,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:32,229 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2021-05-06 11:35:32,229 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 1.9) internal successors, (19), 8 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:32,230 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2021-05-06 11:35:32,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-06 11:35:32,230 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:32,230 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:32,230 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-06 11:35:32,230 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:32,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:32,230 INFO L82 PathProgramCache]: Analyzing trace with hash 753725999, now seen corresponding path program 3 times [2021-05-06 11:35:32,231 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:32,231 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [857045607] [2021-05-06 11:35:32,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:32,236 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:35:32,238 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:32,238 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:32,243 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:32,248 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:32,270 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:35:32,286 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:32,288 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:32,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:32,336 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:32,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:32,339 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:32,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:32,342 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:32,352 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:32,367 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:32,367 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [857045607] [2021-05-06 11:35:32,367 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [857045607] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:32,368 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:32,368 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:35:32,368 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543353486] [2021-05-06 11:35:32,368 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:35:32,368 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:32,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:35:32,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:35:32,369 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 9 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:32,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:32,641 INFO L93 Difference]: Finished difference Result 43 states and 47 transitions. [2021-05-06 11:35:32,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:35:32,642 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 9 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-05-06 11:35:32,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:32,643 INFO L225 Difference]: With dead ends: 43 [2021-05-06 11:35:32,643 INFO L226 Difference]: Without dead ends: 37 [2021-05-06 11:35:32,644 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 245.7ms TimeCoverageRelationStatistics Valid=139, Invalid=367, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:35:32,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-06 11:35:32,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 28. [2021-05-06 11:35:32,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:32,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2021-05-06 11:35:32,648 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 25 [2021-05-06 11:35:32,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:32,648 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2021-05-06 11:35:32,648 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 9 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:32,648 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2021-05-06 11:35:32,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-06 11:35:32,649 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:32,649 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:32,649 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-06 11:35:32,649 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:32,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:32,649 INFO L82 PathProgramCache]: Analyzing trace with hash -1877283798, now seen corresponding path program 4 times [2021-05-06 11:35:32,649 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:32,649 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1667694123] [2021-05-06 11:35:32,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:32,655 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:35:32,672 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:32,673 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:32,677 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:32,682 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:32,692 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:35:32,708 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:32,709 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:32,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:32,762 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:32,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:32,766 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:32,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:32,768 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:32,779 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:32,795 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:32,796 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1667694123] [2021-05-06 11:35:32,796 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1667694123] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:32,796 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:32,796 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 11:35:32,796 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1406743714] [2021-05-06 11:35:32,796 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 11:35:32,796 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:32,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 11:35:32,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:35:32,797 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 10 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) [2021-05-06 11:35:33,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:33,129 INFO L93 Difference]: Finished difference Result 48 states and 53 transitions. [2021-05-06 11:35:33,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 11:35:33,129 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 10 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 [2021-05-06 11:35:33,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:33,130 INFO L225 Difference]: With dead ends: 48 [2021-05-06 11:35:33,130 INFO L226 Difference]: Without dead ends: 42 [2021-05-06 11:35:33,130 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 299.4ms TimeCoverageRelationStatistics Valid=181, Invalid=469, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:35:33,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-06 11:35:33,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 30. [2021-05-06 11:35:33,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:33,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2021-05-06 11:35:33,134 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 27 [2021-05-06 11:35:33,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:33,134 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2021-05-06 11:35:33,134 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 10 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) [2021-05-06 11:35:33,134 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2021-05-06 11:35:33,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-06 11:35:33,135 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:33,135 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:33,135 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-06 11:35:33,135 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:33,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:33,135 INFO L82 PathProgramCache]: Analyzing trace with hash -541961371, now seen corresponding path program 5 times [2021-05-06 11:35:33,135 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:33,135 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2080214131] [2021-05-06 11:35:33,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:33,141 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:35:33,159 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:33,159 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:33,164 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:33,168 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:33,178 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:35:33,194 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:33,195 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:33,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:33,253 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:33,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:33,256 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:33,258 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:33,259 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:33,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:33,287 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:33,287 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2080214131] [2021-05-06 11:35:33,287 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2080214131] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:33,287 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:33,288 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:35:33,288 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122223477] [2021-05-06 11:35:33,288 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:35:33,288 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:33,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:35:33,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:35:33,289 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:33,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:33,688 INFO L93 Difference]: Finished difference Result 53 states and 59 transitions. [2021-05-06 11:35:33,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 11:35:33,688 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 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 [2021-05-06 11:35:33,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:33,689 INFO L225 Difference]: With dead ends: 53 [2021-05-06 11:35:33,689 INFO L226 Difference]: Without dead ends: 47 [2021-05-06 11:35:33,689 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 365.3ms TimeCoverageRelationStatistics Valid=229, Invalid=583, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:35:33,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-06 11:35:33,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 32. [2021-05-06 11:35:33,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 27 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:33,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2021-05-06 11:35:33,693 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 29 [2021-05-06 11:35:33,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:33,694 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2021-05-06 11:35:33,694 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:33,694 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2021-05-06 11:35:33,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-06 11:35:33,694 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:33,694 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:33,694 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-06 11:35:33,695 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:33,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:33,695 INFO L82 PathProgramCache]: Analyzing trace with hash -1492330528, now seen corresponding path program 6 times [2021-05-06 11:35:33,695 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:33,695 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2114049934] [2021-05-06 11:35:33,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:33,700 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:35:33,701 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:33,701 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:33,706 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:33,710 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:33,732 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:35:33,748 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:33,749 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:33,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:33,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:33,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:33,816 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:33,817 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:33,818 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:33,829 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:33,847 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:33,847 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2114049934] [2021-05-06 11:35:33,847 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2114049934] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:33,847 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:33,847 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:35:33,847 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558574194] [2021-05-06 11:35:33,848 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:35:33,848 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:33,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:35:33,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:35:33,848 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 12 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:34,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:34,266 INFO L93 Difference]: Finished difference Result 58 states and 65 transitions. [2021-05-06 11:35:34,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:35:34,266 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 12 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-06 11:35:34,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:34,267 INFO L225 Difference]: With dead ends: 58 [2021-05-06 11:35:34,267 INFO L226 Difference]: Without dead ends: 52 [2021-05-06 11:35:34,267 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 379.6ms TimeCoverageRelationStatistics Valid=283, Invalid=709, Unknown=0, NotChecked=0, Total=992 [2021-05-06 11:35:34,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-06 11:35:34,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 34. [2021-05-06 11:35:34,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 29 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:34,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2021-05-06 11:35:34,271 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 31 [2021-05-06 11:35:34,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:34,271 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2021-05-06 11:35:34,271 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 12 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:34,271 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2021-05-06 11:35:34,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-06 11:35:34,272 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:34,272 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:34,272 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-06 11:35:34,272 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:34,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:34,272 INFO L82 PathProgramCache]: Analyzing trace with hash 30943643, now seen corresponding path program 7 times [2021-05-06 11:35:34,273 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:34,273 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1056598392] [2021-05-06 11:35:34,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:34,277 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:35:34,293 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:34,294 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:34,298 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:34,302 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:34,311 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:35:34,326 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:34,327 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:34,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:34,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:34,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:34,399 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:34,400 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:34,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:34,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:34,431 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:34,431 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1056598392] [2021-05-06 11:35:34,431 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1056598392] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:34,431 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:34,431 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:35:34,432 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796018253] [2021-05-06 11:35:34,432 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:35:34,432 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:34,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:35:34,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=147, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:35:34,432 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 13 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:34,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:34,966 INFO L93 Difference]: Finished difference Result 63 states and 71 transitions. [2021-05-06 11:35:34,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 11:35:34,966 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 13 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-05-06 11:35:34,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:34,967 INFO L225 Difference]: With dead ends: 63 [2021-05-06 11:35:34,967 INFO L226 Difference]: Without dead ends: 57 [2021-05-06 11:35:34,968 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 471.1ms TimeCoverageRelationStatistics Valid=343, Invalid=847, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:35:34,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-06 11:35:34,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 36. [2021-05-06 11:35:34,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:34,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2021-05-06 11:35:34,972 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 33 [2021-05-06 11:35:34,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:34,973 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2021-05-06 11:35:34,973 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 13 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:34,973 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2021-05-06 11:35:34,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-06 11:35:34,973 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:34,973 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:34,974 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-06 11:35:34,974 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:34,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:34,974 INFO L82 PathProgramCache]: Analyzing trace with hash -686425962, now seen corresponding path program 8 times [2021-05-06 11:35:34,974 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:34,974 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1323771700] [2021-05-06 11:35:34,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:34,979 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:35:34,996 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:34,997 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:35,001 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:35,005 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:35,015 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:35:35,030 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:35,031 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:35,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:35,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:35,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:35,113 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:35,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:35,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:35,127 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:35,148 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:35,149 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1323771700] [2021-05-06 11:35:35,149 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1323771700] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:35,149 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:35,149 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:35:35,149 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330144338] [2021-05-06 11:35:35,149 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:35:35,149 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:35,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:35:35,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=166, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:35:35,150 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 14 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) [2021-05-06 11:35:35,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:35,746 INFO L93 Difference]: Finished difference Result 68 states and 77 transitions. [2021-05-06 11:35:35,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 11:35:35,746 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 14 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 [2021-05-06 11:35:35,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:35,747 INFO L225 Difference]: With dead ends: 68 [2021-05-06 11:35:35,747 INFO L226 Difference]: Without dead ends: 62 [2021-05-06 11:35:35,748 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 297 ImplicationChecksByTransitivity, 538.1ms TimeCoverageRelationStatistics Valid=409, Invalid=997, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 11:35:35,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-06 11:35:35,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 38. [2021-05-06 11:35:35,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 33 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:35,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2021-05-06 11:35:35,753 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 35 [2021-05-06 11:35:35,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:35,753 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2021-05-06 11:35:35,753 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 14 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) [2021-05-06 11:35:35,753 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2021-05-06 11:35:35,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 11:35:35,754 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:35,754 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:35,754 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-05-06 11:35:35,754 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:35,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:35,754 INFO L82 PathProgramCache]: Analyzing trace with hash 1411118289, now seen corresponding path program 9 times [2021-05-06 11:35:35,754 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:35,754 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [360224509] [2021-05-06 11:35:35,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:35,759 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:35:35,760 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:35,760 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:35,765 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:35,769 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:35,791 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:35:35,856 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:35,857 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:35,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:35,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:35,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:35,973 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:35,974 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:35,975 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:35,990 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:36,012 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:36,012 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [360224509] [2021-05-06 11:35:36,012 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [360224509] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:36,012 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:36,012 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:35:36,012 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997631237] [2021-05-06 11:35:36,012 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:35:36,013 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:36,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:35:36,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=186, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:35:36,013 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 15 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) [2021-05-06 11:35:36,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:36,675 INFO L93 Difference]: Finished difference Result 73 states and 83 transitions. [2021-05-06 11:35:36,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 11:35:36,676 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 15 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 [2021-05-06 11:35:36,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:36,676 INFO L225 Difference]: With dead ends: 73 [2021-05-06 11:35:36,676 INFO L226 Difference]: Without dead ends: 67 [2021-05-06 11:35:36,677 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 566.3ms TimeCoverageRelationStatistics Valid=481, Invalid=1159, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 11:35:36,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-05-06 11:35:36,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 40. [2021-05-06 11:35:36,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 35 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:36,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2021-05-06 11:35:36,683 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 37 [2021-05-06 11:35:36,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:36,683 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2021-05-06 11:35:36,683 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 15 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) [2021-05-06 11:35:36,683 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2021-05-06 11:35:36,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-06 11:35:36,684 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:36,684 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:36,684 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-06 11:35:36,684 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:36,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:36,684 INFO L82 PathProgramCache]: Analyzing trace with hash -1483485620, now seen corresponding path program 10 times [2021-05-06 11:35:36,684 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:36,685 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [48362765] [2021-05-06 11:35:36,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:36,692 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:35:36,693 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:36,698 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:36,702 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:36,707 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:36,727 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:35:36,744 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:36,745 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:36,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:36,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:36,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:36,867 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:36,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:36,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:36,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:36,906 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:36,907 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [48362765] [2021-05-06 11:35:36,907 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [48362765] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:36,907 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:36,907 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:35:36,907 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469613749] [2021-05-06 11:35:36,907 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:35:36,907 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:36,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:35:36,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=207, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:35:36,908 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand has 18 states, 18 states have (on average 1.9444444444444444) internal successors, (35), 16 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:37,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:37,619 INFO L93 Difference]: Finished difference Result 78 states and 89 transitions. [2021-05-06 11:35:37,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 11:35:37,619 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.9444444444444444) internal successors, (35), 16 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2021-05-06 11:35:37,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:37,620 INFO L225 Difference]: With dead ends: 78 [2021-05-06 11:35:37,620 INFO L226 Difference]: Without dead ends: 72 [2021-05-06 11:35:37,620 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 418 ImplicationChecksByTransitivity, 618.6ms TimeCoverageRelationStatistics Valid=559, Invalid=1333, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 11:35:37,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-06 11:35:37,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 42. [2021-05-06 11:35:37,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 37 states have (on average 1.054054054054054) internal successors, (39), 37 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:37,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2021-05-06 11:35:37,625 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 39 [2021-05-06 11:35:37,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:37,625 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2021-05-06 11:35:37,625 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.9444444444444444) internal successors, (35), 16 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:37,625 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2021-05-06 11:35:37,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-06 11:35:37,625 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:37,626 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:37,626 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-05-06 11:35:37,626 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:37,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:37,626 INFO L82 PathProgramCache]: Analyzing trace with hash -59034361, now seen corresponding path program 11 times [2021-05-06 11:35:37,626 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:37,626 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [772539326] [2021-05-06 11:35:37,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:37,652 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:35:37,671 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:37,672 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:37,676 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:37,679 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:37,689 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:35:37,714 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:37,715 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:37,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:37,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:37,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:37,841 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:37,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:37,845 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:37,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:37,887 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:37,887 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [772539326] [2021-05-06 11:35:37,887 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [772539326] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:37,887 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:37,887 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 11:35:37,888 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [95807799] [2021-05-06 11:35:37,888 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 11:35:37,888 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:37,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 11:35:37,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=229, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:35:37,888 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 17 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:38,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:38,652 INFO L93 Difference]: Finished difference Result 83 states and 95 transitions. [2021-05-06 11:35:38,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 11:35:38,653 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 17 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 [2021-05-06 11:35:38,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:38,654 INFO L225 Difference]: With dead ends: 83 [2021-05-06 11:35:38,654 INFO L226 Difference]: Without dead ends: 77 [2021-05-06 11:35:38,655 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 486 ImplicationChecksByTransitivity, 685.7ms TimeCoverageRelationStatistics Valid=643, Invalid=1519, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 11:35:38,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-06 11:35:38,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 44. [2021-05-06 11:35:38,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 39 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:38,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions. [2021-05-06 11:35:38,662 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 41 [2021-05-06 11:35:38,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:38,662 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 45 transitions. [2021-05-06 11:35:38,662 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 17 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:38,662 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions. [2021-05-06 11:35:38,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 11:35:38,664 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:38,664 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:38,664 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-06 11:35:38,665 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:38,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:38,665 INFO L82 PathProgramCache]: Analyzing trace with hash -1255941886, now seen corresponding path program 12 times [2021-05-06 11:35:38,665 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:38,665 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [578182806] [2021-05-06 11:35:38,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:38,689 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:35:38,704 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:38,706 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:38,710 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:38,714 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:38,723 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:35:38,740 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:38,741 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:38,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:38,900 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:38,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:38,906 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:38,908 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:38,908 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:38,921 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:38,944 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:38,945 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [578182806] [2021-05-06 11:35:38,945 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [578182806] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:38,945 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:38,945 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 11:35:38,945 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13439285] [2021-05-06 11:35:38,946 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 11:35:38,946 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:38,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 11:35:38,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=252, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:35:38,946 INFO L87 Difference]: Start difference. First operand 44 states and 45 transitions. Second operand has 20 states, 20 states have (on average 1.95) internal successors, (39), 18 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:39,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:39,789 INFO L93 Difference]: Finished difference Result 88 states and 101 transitions. [2021-05-06 11:35:39,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 11:35:39,789 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.95) internal successors, (39), 18 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 [2021-05-06 11:35:39,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:39,790 INFO L225 Difference]: With dead ends: 88 [2021-05-06 11:35:39,790 INFO L226 Difference]: Without dead ends: 82 [2021-05-06 11:35:39,792 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 559 ImplicationChecksByTransitivity, 766.0ms TimeCoverageRelationStatistics Valid=733, Invalid=1717, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 11:35:39,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-06 11:35:39,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 46. [2021-05-06 11:35:39,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.048780487804878) internal successors, (43), 41 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:39,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2021-05-06 11:35:39,801 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 43 [2021-05-06 11:35:39,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:39,801 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2021-05-06 11:35:39,801 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 1.95) internal successors, (39), 18 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:39,801 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2021-05-06 11:35:39,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-06 11:35:39,802 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:39,803 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:39,803 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-06 11:35:39,803 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:39,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:39,803 INFO L82 PathProgramCache]: Analyzing trace with hash -432838083, now seen corresponding path program 13 times [2021-05-06 11:35:39,803 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:39,803 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [694269861] [2021-05-06 11:35:39,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:39,816 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:35:39,817 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:39,817 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:39,822 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:39,826 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:39,857 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:35:39,873 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:39,874 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:39,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:40,062 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:40,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:40,069 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:40,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:40,071 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:40,083 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:40,119 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:40,120 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [694269861] [2021-05-06 11:35:40,120 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [694269861] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:40,120 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:40,120 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:35:40,120 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85773520] [2021-05-06 11:35:40,120 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:35:40,120 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:40,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:35:40,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=276, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:35:40,121 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand has 21 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 19 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:41,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:41,091 INFO L93 Difference]: Finished difference Result 93 states and 107 transitions. [2021-05-06 11:35:41,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 11:35:41,092 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 19 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2021-05-06 11:35:41,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:41,092 INFO L225 Difference]: With dead ends: 93 [2021-05-06 11:35:41,092 INFO L226 Difference]: Without dead ends: 87 [2021-05-06 11:35:41,093 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 637 ImplicationChecksByTransitivity, 927.9ms TimeCoverageRelationStatistics Valid=829, Invalid=1927, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 11:35:41,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-06 11:35:41,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 48. [2021-05-06 11:35:41,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 43 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:41,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2021-05-06 11:35:41,098 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 45 [2021-05-06 11:35:41,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:41,098 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2021-05-06 11:35:41,098 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 19 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:41,098 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2021-05-06 11:35:41,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-06 11:35:41,099 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:41,099 INFO L523 BasicCegarLoop]: trace histogram [15, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:41,099 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-05-06 11:35:41,099 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:41,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:41,099 INFO L82 PathProgramCache]: Analyzing trace with hash 295934136, now seen corresponding path program 14 times [2021-05-06 11:35:41,099 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:41,099 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2096262989] [2021-05-06 11:35:41,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:41,103 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:35:41,119 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:41,119 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:41,123 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:41,127 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:41,136 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:35:41,151 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:41,152 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:41,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:41,293 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:41,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:41,296 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:41,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:41,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:41,311 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:41,339 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:41,339 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2096262989] [2021-05-06 11:35:41,340 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2096262989] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:41,340 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:41,340 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:35:41,340 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923669575] [2021-05-06 11:35:41,340 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:35:41,340 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:41,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:35:41,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=301, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:35:41,341 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand has 22 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 20 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:42,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:42,350 INFO L93 Difference]: Finished difference Result 98 states and 113 transitions. [2021-05-06 11:35:42,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 11:35:42,350 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 20 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 [2021-05-06 11:35:42,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:42,351 INFO L225 Difference]: With dead ends: 98 [2021-05-06 11:35:42,351 INFO L226 Difference]: Without dead ends: 92 [2021-05-06 11:35:42,352 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 720 ImplicationChecksByTransitivity, 938.1ms TimeCoverageRelationStatistics Valid=931, Invalid=2149, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 11:35:42,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-06 11:35:42,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 50. [2021-05-06 11:35:42,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.0444444444444445) internal successors, (47), 45 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:42,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2021-05-06 11:35:42,357 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 47 [2021-05-06 11:35:42,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:42,357 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2021-05-06 11:35:42,357 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 20 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:42,357 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2021-05-06 11:35:42,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 11:35:42,358 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:42,358 INFO L523 BasicCegarLoop]: trace histogram [16, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:42,358 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-05-06 11:35:42,358 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:42,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:42,358 INFO L82 PathProgramCache]: Analyzing trace with hash 566367347, now seen corresponding path program 15 times [2021-05-06 11:35:42,358 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:42,358 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2105330694] [2021-05-06 11:35:42,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:42,362 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:35:42,378 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:42,378 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:42,382 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:42,386 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:42,395 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:35:42,411 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:42,412 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:42,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:42,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:42,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:42,567 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:42,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:42,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:42,582 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:42,611 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:42,611 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2105330694] [2021-05-06 11:35:42,611 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2105330694] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:42,611 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:42,612 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 11:35:42,612 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915971899] [2021-05-06 11:35:42,612 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 11:35:42,612 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:42,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 11:35:42,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=327, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:35:42,612 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand has 23 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 21 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:43,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:43,687 INFO L93 Difference]: Finished difference Result 103 states and 119 transitions. [2021-05-06 11:35:43,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 11:35:43,687 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 21 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 [2021-05-06 11:35:43,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:43,688 INFO L225 Difference]: With dead ends: 103 [2021-05-06 11:35:43,688 INFO L226 Difference]: Without dead ends: 97 [2021-05-06 11:35:43,688 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 808 ImplicationChecksByTransitivity, 1006.8ms TimeCoverageRelationStatistics Valid=1039, Invalid=2383, Unknown=0, NotChecked=0, Total=3422 [2021-05-06 11:35:43,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-05-06 11:35:43,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 52. [2021-05-06 11:35:43,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 47 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:43,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2021-05-06 11:35:43,694 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 49 [2021-05-06 11:35:43,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:43,694 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2021-05-06 11:35:43,694 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 21 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:43,694 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2021-05-06 11:35:43,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 11:35:43,694 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:43,694 INFO L523 BasicCegarLoop]: trace histogram [17, 16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:43,694 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-06 11:35:43,694 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:43,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:43,695 INFO L82 PathProgramCache]: Analyzing trace with hash -1540321938, now seen corresponding path program 16 times [2021-05-06 11:35:43,695 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:43,695 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [763235251] [2021-05-06 11:35:43,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:43,699 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:35:43,699 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:43,700 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:43,704 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:43,707 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:43,728 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:35:43,743 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:43,744 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:43,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:43,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:43,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:43,909 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:43,910 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:43,911 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:43,925 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:43,955 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:43,956 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [763235251] [2021-05-06 11:35:43,956 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [763235251] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:43,956 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:43,956 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:35:43,956 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071170936] [2021-05-06 11:35:43,956 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:35:43,956 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:43,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:35:43,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=354, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:35:43,957 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand has 24 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 22 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:45,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:45,130 INFO L93 Difference]: Finished difference Result 108 states and 125 transitions. [2021-05-06 11:35:45,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 11:35:45,130 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 22 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 [2021-05-06 11:35:45,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:45,131 INFO L225 Difference]: With dead ends: 108 [2021-05-06 11:35:45,131 INFO L226 Difference]: Without dead ends: 102 [2021-05-06 11:35:45,132 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 901 ImplicationChecksByTransitivity, 1088.6ms TimeCoverageRelationStatistics Valid=1153, Invalid=2629, Unknown=0, NotChecked=0, Total=3782 [2021-05-06 11:35:45,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-05-06 11:35:45,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 54. [2021-05-06 11:35:45,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 49 states have (on average 1.0408163265306123) internal successors, (51), 49 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:45,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2021-05-06 11:35:45,139 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 51 [2021-05-06 11:35:45,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:45,139 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2021-05-06 11:35:45,139 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 22 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:45,139 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2021-05-06 11:35:45,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-06 11:35:45,139 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:45,139 INFO L523 BasicCegarLoop]: trace histogram [18, 17, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:45,139 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-05-06 11:35:45,139 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:45,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:45,140 INFO L82 PathProgramCache]: Analyzing trace with hash 1155838889, now seen corresponding path program 17 times [2021-05-06 11:35:45,140 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:45,140 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [999556534] [2021-05-06 11:35:45,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:45,144 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:35:45,145 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:45,145 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:45,149 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:45,153 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:45,173 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:35:45,189 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:45,190 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:45,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:45,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:45,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:45,370 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:45,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:45,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:45,385 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:45,417 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:45,418 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [999556534] [2021-05-06 11:35:45,418 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [999556534] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:45,418 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:45,418 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 11:35:45,418 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953879515] [2021-05-06 11:35:45,418 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 11:35:45,418 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:45,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 11:35:45,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=382, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:35:45,419 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand has 25 states, 25 states have (on average 1.96) internal successors, (49), 23 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:46,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:46,679 INFO L93 Difference]: Finished difference Result 113 states and 131 transitions. [2021-05-06 11:35:46,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 11:35:46,680 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.96) internal successors, (49), 23 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 [2021-05-06 11:35:46,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:46,680 INFO L225 Difference]: With dead ends: 113 [2021-05-06 11:35:46,680 INFO L226 Difference]: Without dead ends: 107 [2021-05-06 11:35:46,681 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 999 ImplicationChecksByTransitivity, 1178.1ms TimeCoverageRelationStatistics Valid=1273, Invalid=2887, Unknown=0, NotChecked=0, Total=4160 [2021-05-06 11:35:46,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-05-06 11:35:46,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 56. [2021-05-06 11:35:46,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 51 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:46,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2021-05-06 11:35:46,687 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 53 [2021-05-06 11:35:46,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:46,687 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2021-05-06 11:35:46,687 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.96) internal successors, (49), 23 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:46,687 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2021-05-06 11:35:46,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 11:35:46,688 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:46,688 INFO L523 BasicCegarLoop]: trace histogram [19, 18, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:46,688 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-05-06 11:35:46,688 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:46,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:46,688 INFO L82 PathProgramCache]: Analyzing trace with hash -1993853148, now seen corresponding path program 18 times [2021-05-06 11:35:46,688 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:46,688 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [674772890] [2021-05-06 11:35:46,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:46,692 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:35:46,708 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:46,709 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:46,713 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:46,716 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:46,725 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:35:46,741 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:46,742 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:46,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:46,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:46,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:46,940 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:46,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:46,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:46,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:46,991 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:46,991 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [674772890] [2021-05-06 11:35:46,991 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [674772890] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:46,991 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:46,991 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:35:46,991 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496506986] [2021-05-06 11:35:46,992 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:35:46,992 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:46,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:35:46,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=411, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:35:46,992 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand has 26 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 24 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:48,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:48,279 INFO L93 Difference]: Finished difference Result 118 states and 137 transitions. [2021-05-06 11:35:48,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-06 11:35:48,279 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 24 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2021-05-06 11:35:48,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:48,280 INFO L225 Difference]: With dead ends: 118 [2021-05-06 11:35:48,280 INFO L226 Difference]: Without dead ends: 112 [2021-05-06 11:35:48,281 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1102 ImplicationChecksByTransitivity, 1238.0ms TimeCoverageRelationStatistics Valid=1399, Invalid=3157, Unknown=0, NotChecked=0, Total=4556 [2021-05-06 11:35:48,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-05-06 11:35:48,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 58. [2021-05-06 11:35:48,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.0377358490566038) internal successors, (55), 53 states have internal predecessors, (55), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:48,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2021-05-06 11:35:48,287 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 55 [2021-05-06 11:35:48,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:48,287 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2021-05-06 11:35:48,287 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 24 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:48,287 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2021-05-06 11:35:48,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-06 11:35:48,288 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:48,288 INFO L523 BasicCegarLoop]: trace histogram [20, 19, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:48,288 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-05-06 11:35:48,288 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:48,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:48,288 INFO L82 PathProgramCache]: Analyzing trace with hash -895957025, now seen corresponding path program 19 times [2021-05-06 11:35:48,288 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:48,288 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1742843988] [2021-05-06 11:35:48,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:48,296 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:35:48,312 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:48,312 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:48,316 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:48,320 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:48,329 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:35:48,344 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:48,345 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:48,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:48,554 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:48,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:48,561 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:48,567 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:48,570 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:48,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:48,625 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:48,626 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1742843988] [2021-05-06 11:35:48,626 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1742843988] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:48,626 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:48,626 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 11:35:48,626 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296236581] [2021-05-06 11:35:48,626 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 11:35:48,626 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:48,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 11:35:48,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=261, Invalid=441, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:35:48,627 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand has 27 states, 27 states have (on average 1.962962962962963) internal successors, (53), 25 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:49,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:49,983 INFO L93 Difference]: Finished difference Result 123 states and 143 transitions. [2021-05-06 11:35:49,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-06 11:35:49,983 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.962962962962963) internal successors, (53), 25 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 [2021-05-06 11:35:49,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:49,984 INFO L225 Difference]: With dead ends: 123 [2021-05-06 11:35:49,984 INFO L226 Difference]: Without dead ends: 117 [2021-05-06 11:35:49,985 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1210 ImplicationChecksByTransitivity, 1283.2ms TimeCoverageRelationStatistics Valid=1531, Invalid=3439, Unknown=0, NotChecked=0, Total=4970 [2021-05-06 11:35:49,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-06 11:35:49,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 60. [2021-05-06 11:35:49,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 55 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:49,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2021-05-06 11:35:49,991 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 57 [2021-05-06 11:35:49,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:49,991 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2021-05-06 11:35:49,991 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 1.962962962962963) internal successors, (53), 25 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:49,991 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2021-05-06 11:35:49,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-06 11:35:49,991 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:49,991 INFO L523 BasicCegarLoop]: trace histogram [21, 20, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:49,992 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-05-06 11:35:49,992 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:49,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:49,992 INFO L82 PathProgramCache]: Analyzing trace with hash 1915229658, now seen corresponding path program 20 times [2021-05-06 11:35:49,992 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:49,992 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [329213176] [2021-05-06 11:35:49,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:49,996 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:35:49,997 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:49,997 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:50,001 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:50,005 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:50,025 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:35:50,040 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:50,041 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:50,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:50,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:50,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:50,271 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:50,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:50,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:50,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:50,325 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:50,325 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [329213176] [2021-05-06 11:35:50,325 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [329213176] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:50,325 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:50,325 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 11:35:50,325 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115338492] [2021-05-06 11:35:50,326 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 11:35:50,326 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:50,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 11:35:50,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=284, Invalid=472, Unknown=0, NotChecked=0, Total=756 [2021-05-06 11:35:50,326 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand has 28 states, 28 states have (on average 1.9642857142857142) internal successors, (55), 26 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:51,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:51,761 INFO L93 Difference]: Finished difference Result 128 states and 149 transitions. [2021-05-06 11:35:51,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 11:35:51,762 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.9642857142857142) internal successors, (55), 26 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 [2021-05-06 11:35:51,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:51,762 INFO L225 Difference]: With dead ends: 128 [2021-05-06 11:35:51,762 INFO L226 Difference]: Without dead ends: 122 [2021-05-06 11:35:51,763 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1323 ImplicationChecksByTransitivity, 1354.4ms TimeCoverageRelationStatistics Valid=1669, Invalid=3733, Unknown=0, NotChecked=0, Total=5402 [2021-05-06 11:35:51,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-05-06 11:35:51,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 62. [2021-05-06 11:35:51,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 57 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:51,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2021-05-06 11:35:51,770 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 59 [2021-05-06 11:35:51,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:51,770 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2021-05-06 11:35:51,770 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.9642857142857142) internal successors, (55), 26 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:51,770 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2021-05-06 11:35:51,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 11:35:51,771 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:51,771 INFO L523 BasicCegarLoop]: trace histogram [22, 21, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:51,771 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-05-06 11:35:51,771 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:51,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:51,771 INFO L82 PathProgramCache]: Analyzing trace with hash 1931202837, now seen corresponding path program 21 times [2021-05-06 11:35:51,771 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:51,771 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [990561195] [2021-05-06 11:35:51,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:51,775 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:35:51,791 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:51,792 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:51,796 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:51,799 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:51,808 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:35:51,823 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:51,824 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:51,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:52,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:52,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:52,076 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:52,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:52,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:52,093 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:52,131 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:52,131 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [990561195] [2021-05-06 11:35:52,131 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [990561195] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:52,131 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:52,131 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 11:35:52,131 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [691233572] [2021-05-06 11:35:52,131 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 11:35:52,131 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:52,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 11:35:52,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=504, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:35:52,132 INFO L87 Difference]: Start difference. First operand 62 states and 63 transitions. Second operand has 29 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 27 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:53,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:53,640 INFO L93 Difference]: Finished difference Result 133 states and 155 transitions. [2021-05-06 11:35:53,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-06 11:35:53,640 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 27 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 [2021-05-06 11:35:53,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:53,641 INFO L225 Difference]: With dead ends: 133 [2021-05-06 11:35:53,641 INFO L226 Difference]: Without dead ends: 127 [2021-05-06 11:35:53,642 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1441 ImplicationChecksByTransitivity, 1439.5ms TimeCoverageRelationStatistics Valid=1813, Invalid=4039, Unknown=0, NotChecked=0, Total=5852 [2021-05-06 11:35:53,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-06 11:35:53,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 64. [2021-05-06 11:35:53,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 59 states have (on average 1.0338983050847457) internal successors, (61), 59 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:53,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2021-05-06 11:35:53,649 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 61 [2021-05-06 11:35:53,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:53,649 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2021-05-06 11:35:53,650 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 27 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:53,650 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2021-05-06 11:35:53,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-06 11:35:53,650 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:53,650 INFO L523 BasicCegarLoop]: trace histogram [23, 22, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:53,650 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-05-06 11:35:53,650 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:53,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:53,650 INFO L82 PathProgramCache]: Analyzing trace with hash 101558672, now seen corresponding path program 22 times [2021-05-06 11:35:53,651 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:53,651 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1417519269] [2021-05-06 11:35:53,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:53,654 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:35:53,655 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:53,656 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:53,659 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:53,663 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:53,684 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:35:53,699 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:53,700 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:53,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:53,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:53,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:53,967 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:53,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:53,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:53,986 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:54,031 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:54,031 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1417519269] [2021-05-06 11:35:54,031 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1417519269] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:54,031 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:54,031 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 11:35:54,031 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60897076] [2021-05-06 11:35:54,031 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 11:35:54,031 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:54,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 11:35:54,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=333, Invalid=537, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:35:54,032 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand has 30 states, 30 states have (on average 1.9666666666666666) internal successors, (59), 28 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:55,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:55,631 INFO L93 Difference]: Finished difference Result 138 states and 161 transitions. [2021-05-06 11:35:55,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-06 11:35:55,631 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.9666666666666666) internal successors, (59), 28 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 63 [2021-05-06 11:35:55,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:55,632 INFO L225 Difference]: With dead ends: 138 [2021-05-06 11:35:55,632 INFO L226 Difference]: Without dead ends: 132 [2021-05-06 11:35:55,632 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1564 ImplicationChecksByTransitivity, 1520.0ms TimeCoverageRelationStatistics Valid=1963, Invalid=4357, Unknown=0, NotChecked=0, Total=6320 [2021-05-06 11:35:55,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-05-06 11:35:55,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 66. [2021-05-06 11:35:55,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 61 states have (on average 1.0327868852459017) internal successors, (63), 61 states have internal predecessors, (63), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:55,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2021-05-06 11:35:55,640 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 63 [2021-05-06 11:35:55,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:55,640 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2021-05-06 11:35:55,640 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 1.9666666666666666) internal successors, (59), 28 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:55,640 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2021-05-06 11:35:55,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-06 11:35:55,641 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:55,641 INFO L523 BasicCegarLoop]: trace histogram [24, 23, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:55,641 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-05-06 11:35:55,641 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:55,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:55,641 INFO L82 PathProgramCache]: Analyzing trace with hash -1544859829, now seen corresponding path program 23 times [2021-05-06 11:35:55,641 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:55,641 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1491544213] [2021-05-06 11:35:55,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:55,645 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:35:55,660 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:55,660 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:55,664 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:55,668 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:55,677 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:35:55,692 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:55,693 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:55,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:55,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:55,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:55,980 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:55,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:55,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:55,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:56,038 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:56,038 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1491544213] [2021-05-06 11:35:56,038 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1491544213] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:56,038 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:56,038 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 11:35:56,038 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166117104] [2021-05-06 11:35:56,039 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 11:35:56,039 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:56,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 11:35:56,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=359, Invalid=571, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:35:56,039 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand has 31 states, 31 states have (on average 1.967741935483871) internal successors, (61), 29 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:57,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:57,694 INFO L93 Difference]: Finished difference Result 143 states and 167 transitions. [2021-05-06 11:35:57,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-06 11:35:57,694 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.967741935483871) internal successors, (61), 29 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 [2021-05-06 11:35:57,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:57,695 INFO L225 Difference]: With dead ends: 143 [2021-05-06 11:35:57,695 INFO L226 Difference]: Without dead ends: 137 [2021-05-06 11:35:57,696 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1692 ImplicationChecksByTransitivity, 1602.1ms TimeCoverageRelationStatistics Valid=2119, Invalid=4687, Unknown=0, NotChecked=0, Total=6806 [2021-05-06 11:35:57,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-05-06 11:35:57,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 68. [2021-05-06 11:35:57,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 63 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:57,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 69 transitions. [2021-05-06 11:35:57,704 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 69 transitions. Word has length 65 [2021-05-06 11:35:57,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:57,704 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 69 transitions. [2021-05-06 11:35:57,704 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.967741935483871) internal successors, (61), 29 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:57,704 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 69 transitions. [2021-05-06 11:35:57,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 11:35:57,705 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:57,705 INFO L523 BasicCegarLoop]: trace histogram [25, 24, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:57,705 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-05-06 11:35:57,705 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:57,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:57,705 INFO L82 PathProgramCache]: Analyzing trace with hash 1089892934, now seen corresponding path program 24 times [2021-05-06 11:35:57,705 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:57,705 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [658195467] [2021-05-06 11:35:57,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:57,709 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:35:57,724 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:57,725 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:57,728 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:57,732 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:57,741 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:35:57,756 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:57,757 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:57,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:58,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:35:58,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:35:58,067 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:35:58,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:58,069 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:58,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:35:58,127 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:35:58,128 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [658195467] [2021-05-06 11:35:58,128 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [658195467] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:35:58,128 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:35:58,128 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 11:35:58,128 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740179162] [2021-05-06 11:35:58,128 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 11:35:58,128 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:35:58,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 11:35:58,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=386, Invalid=606, Unknown=0, NotChecked=0, Total=992 [2021-05-06 11:35:58,129 INFO L87 Difference]: Start difference. First operand 68 states and 69 transitions. Second operand has 32 states, 32 states have (on average 1.96875) internal successors, (63), 30 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:59,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:59,906 INFO L93 Difference]: Finished difference Result 148 states and 173 transitions. [2021-05-06 11:35:59,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-06 11:35:59,906 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.96875) internal successors, (63), 30 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 [2021-05-06 11:35:59,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:59,907 INFO L225 Difference]: With dead ends: 148 [2021-05-06 11:35:59,907 INFO L226 Difference]: Without dead ends: 142 [2021-05-06 11:35:59,907 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1825 ImplicationChecksByTransitivity, 1698.4ms TimeCoverageRelationStatistics Valid=2281, Invalid=5029, Unknown=0, NotChecked=0, Total=7310 [2021-05-06 11:35:59,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-05-06 11:35:59,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 70. [2021-05-06 11:35:59,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 65 states have (on average 1.0307692307692307) internal successors, (67), 65 states have internal predecessors, (67), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:59,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 71 transitions. [2021-05-06 11:35:59,915 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 71 transitions. Word has length 67 [2021-05-06 11:35:59,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:35:59,916 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 71 transitions. [2021-05-06 11:35:59,916 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.96875) internal successors, (63), 30 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:59,916 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 71 transitions. [2021-05-06 11:35:59,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 11:35:59,916 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:35:59,916 INFO L523 BasicCegarLoop]: trace histogram [26, 25, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:35:59,916 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-05-06 11:35:59,916 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:35:59,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:35:59,917 INFO L82 PathProgramCache]: Analyzing trace with hash -943406463, now seen corresponding path program 25 times [2021-05-06 11:35:59,917 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:35:59,917 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [977102197] [2021-05-06 11:35:59,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:35:59,920 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:35:59,936 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:59,936 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:35:59,940 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:35:59,944 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:35:59,952 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:35:59,967 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:35:59,968 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:35:59,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:00,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:00,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:00,303 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:00,304 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:00,304 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:00,329 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:00,371 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:00,372 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [977102197] [2021-05-06 11:36:00,372 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [977102197] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:00,372 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:00,372 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 11:36:00,372 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421806945] [2021-05-06 11:36:00,372 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 11:36:00,372 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:00,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 11:36:00,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=414, Invalid=642, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:36:00,373 INFO L87 Difference]: Start difference. First operand 70 states and 71 transitions. Second operand has 33 states, 33 states have (on average 1.9696969696969697) internal successors, (65), 31 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:02,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:02,249 INFO L93 Difference]: Finished difference Result 153 states and 179 transitions. [2021-05-06 11:36:02,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-06 11:36:02,250 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.9696969696969697) internal successors, (65), 31 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 69 [2021-05-06 11:36:02,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:02,250 INFO L225 Difference]: With dead ends: 153 [2021-05-06 11:36:02,250 INFO L226 Difference]: Without dead ends: 147 [2021-05-06 11:36:02,251 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1963 ImplicationChecksByTransitivity, 1811.7ms TimeCoverageRelationStatistics Valid=2449, Invalid=5383, Unknown=0, NotChecked=0, Total=7832 [2021-05-06 11:36:02,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-05-06 11:36:02,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 72. [2021-05-06 11:36:02,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 67 states have internal predecessors, (69), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:02,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2021-05-06 11:36:02,259 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 69 [2021-05-06 11:36:02,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:02,260 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2021-05-06 11:36:02,260 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.9696969696969697) internal successors, (65), 31 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:02,260 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2021-05-06 11:36:02,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-06 11:36:02,260 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:02,260 INFO L523 BasicCegarLoop]: trace histogram [27, 26, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:02,260 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-05-06 11:36:02,260 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:02,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:02,261 INFO L82 PathProgramCache]: Analyzing trace with hash -734007300, now seen corresponding path program 26 times [2021-05-06 11:36:02,261 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:02,261 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1689039273] [2021-05-06 11:36:02,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:02,265 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:36:02,266 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:02,266 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:02,270 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:36:02,274 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:36:02,294 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:36:02,311 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:02,312 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:36:02,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:02,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:02,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:02,675 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:02,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:02,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:02,703 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:02,748 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:02,749 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1689039273] [2021-05-06 11:36:02,749 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1689039273] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:02,749 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:02,749 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 11:36:02,749 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [831431195] [2021-05-06 11:36:02,749 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 11:36:02,749 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:02,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 11:36:02,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=443, Invalid=679, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 11:36:02,749 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand has 34 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 32 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:04,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:04,718 INFO L93 Difference]: Finished difference Result 158 states and 185 transitions. [2021-05-06 11:36:04,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-06 11:36:04,718 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 32 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 71 [2021-05-06 11:36:04,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:04,719 INFO L225 Difference]: With dead ends: 158 [2021-05-06 11:36:04,719 INFO L226 Difference]: Without dead ends: 152 [2021-05-06 11:36:04,721 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2106 ImplicationChecksByTransitivity, 1896.9ms TimeCoverageRelationStatistics Valid=2623, Invalid=5749, Unknown=0, NotChecked=0, Total=8372 [2021-05-06 11:36:04,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-05-06 11:36:04,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 74. [2021-05-06 11:36:04,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 69 states have (on average 1.0289855072463767) internal successors, (71), 69 states have internal predecessors, (71), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:04,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 75 transitions. [2021-05-06 11:36:04,730 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 75 transitions. Word has length 71 [2021-05-06 11:36:04,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:04,730 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 75 transitions. [2021-05-06 11:36:04,730 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 32 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:04,730 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 75 transitions. [2021-05-06 11:36:04,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 11:36:04,730 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:04,730 INFO L523 BasicCegarLoop]: trace histogram [28, 27, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:04,730 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-05-06 11:36:04,730 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:04,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:04,731 INFO L82 PathProgramCache]: Analyzing trace with hash -1364874569, now seen corresponding path program 27 times [2021-05-06 11:36:04,731 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:04,731 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [588317482] [2021-05-06 11:36:04,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:04,734 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:36:04,735 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:04,735 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:04,739 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:36:04,743 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:36:04,764 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:36:04,779 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:04,782 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:36:04,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:05,173 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:05,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:05,175 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:05,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:05,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:05,196 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:05,240 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:05,241 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [588317482] [2021-05-06 11:36:05,241 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [588317482] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:05,241 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:05,241 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 11:36:05,241 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852382820] [2021-05-06 11:36:05,241 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 11:36:05,241 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:05,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 11:36:05,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=473, Invalid=717, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:36:05,242 INFO L87 Difference]: Start difference. First operand 74 states and 75 transitions. Second operand has 35 states, 35 states have (on average 1.9714285714285715) internal successors, (69), 33 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) [2021-05-06 11:36:07,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:07,339 INFO L93 Difference]: Finished difference Result 163 states and 191 transitions. [2021-05-06 11:36:07,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-06 11:36:07,339 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.9714285714285715) internal successors, (69), 33 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 [2021-05-06 11:36:07,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:07,340 INFO L225 Difference]: With dead ends: 163 [2021-05-06 11:36:07,340 INFO L226 Difference]: Without dead ends: 157 [2021-05-06 11:36:07,341 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2254 ImplicationChecksByTransitivity, 2030.7ms TimeCoverageRelationStatistics Valid=2803, Invalid=6127, Unknown=0, NotChecked=0, Total=8930 [2021-05-06 11:36:07,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-05-06 11:36:07,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 76. [2021-05-06 11:36:07,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.028169014084507) internal successors, (73), 71 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:07,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 77 transitions. [2021-05-06 11:36:07,356 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 77 transitions. Word has length 73 [2021-05-06 11:36:07,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:07,356 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 77 transitions. [2021-05-06 11:36:07,356 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.9714285714285715) internal successors, (69), 33 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) [2021-05-06 11:36:07,356 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 77 transitions. [2021-05-06 11:36:07,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-06 11:36:07,356 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:07,356 INFO L523 BasicCegarLoop]: trace histogram [29, 28, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:07,356 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-05-06 11:36:07,357 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:07,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:07,357 INFO L82 PathProgramCache]: Analyzing trace with hash -2037931342, now seen corresponding path program 28 times [2021-05-06 11:36:07,357 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:07,357 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1163507303] [2021-05-06 11:36:07,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:07,361 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:36:07,376 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:07,377 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:07,381 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:36:07,385 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:36:07,394 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:36:07,409 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:07,411 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:36:07,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:07,814 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:07,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:07,817 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:07,818 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:07,819 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:07,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:07,882 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:07,883 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1163507303] [2021-05-06 11:36:07,883 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1163507303] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:07,883 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:07,883 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 11:36:07,883 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1208503474] [2021-05-06 11:36:07,883 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 11:36:07,883 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:07,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 11:36:07,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=504, Invalid=756, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 11:36:07,884 INFO L87 Difference]: Start difference. First operand 76 states and 77 transitions. Second operand has 36 states, 36 states have (on average 1.9722222222222223) internal successors, (71), 34 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:10,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:10,038 INFO L93 Difference]: Finished difference Result 168 states and 197 transitions. [2021-05-06 11:36:10,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-05-06 11:36:10,039 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.9722222222222223) internal successors, (71), 34 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 75 [2021-05-06 11:36:10,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:10,039 INFO L225 Difference]: With dead ends: 168 [2021-05-06 11:36:10,039 INFO L226 Difference]: Without dead ends: 162 [2021-05-06 11:36:10,040 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2407 ImplicationChecksByTransitivity, 2113.7ms TimeCoverageRelationStatistics Valid=2989, Invalid=6517, Unknown=0, NotChecked=0, Total=9506 [2021-05-06 11:36:10,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-05-06 11:36:10,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 78. [2021-05-06 11:36:10,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 73 states have (on average 1.0273972602739727) internal successors, (75), 73 states have internal predecessors, (75), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:10,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2021-05-06 11:36:10,050 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 75 [2021-05-06 11:36:10,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:10,050 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2021-05-06 11:36:10,050 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 1.9722222222222223) internal successors, (71), 34 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:10,050 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2021-05-06 11:36:10,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 11:36:10,050 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:10,050 INFO L523 BasicCegarLoop]: trace histogram [30, 29, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:10,050 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-05-06 11:36:10,051 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:10,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:10,051 INFO L82 PathProgramCache]: Analyzing trace with hash -305428499, now seen corresponding path program 29 times [2021-05-06 11:36:10,051 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:10,051 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [517910158] [2021-05-06 11:36:10,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:10,054 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:36:10,070 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:10,071 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:10,074 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:36:10,078 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:36:10,087 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:36:10,103 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:10,104 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:36:10,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:10,541 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:10,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:10,543 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:10,544 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:10,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:10,565 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:10,611 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:10,612 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [517910158] [2021-05-06 11:36:10,612 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [517910158] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:10,612 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:10,612 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 11:36:10,612 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922780757] [2021-05-06 11:36:10,612 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 11:36:10,612 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:10,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 11:36:10,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=536, Invalid=796, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 11:36:10,613 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand has 37 states, 37 states have (on average 1.972972972972973) internal successors, (73), 35 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:12,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:12,919 INFO L93 Difference]: Finished difference Result 173 states and 203 transitions. [2021-05-06 11:36:12,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-05-06 11:36:12,919 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.972972972972973) internal successors, (73), 35 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2021-05-06 11:36:12,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:12,920 INFO L225 Difference]: With dead ends: 173 [2021-05-06 11:36:12,920 INFO L226 Difference]: Without dead ends: 167 [2021-05-06 11:36:12,921 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2565 ImplicationChecksByTransitivity, 2243.1ms TimeCoverageRelationStatistics Valid=3181, Invalid=6919, Unknown=0, NotChecked=0, Total=10100 [2021-05-06 11:36:12,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-05-06 11:36:12,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 80. [2021-05-06 11:36:12,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 75 states have (on average 1.0266666666666666) internal successors, (77), 75 states have internal predecessors, (77), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:12,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2021-05-06 11:36:12,931 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 77 [2021-05-06 11:36:12,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:12,931 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2021-05-06 11:36:12,931 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 1.972972972972973) internal successors, (73), 35 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:12,931 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2021-05-06 11:36:12,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 11:36:12,931 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:12,931 INFO L523 BasicCegarLoop]: trace histogram [31, 30, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:12,931 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-05-06 11:36:12,932 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:12,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:12,932 INFO L82 PathProgramCache]: Analyzing trace with hash -1817507224, now seen corresponding path program 30 times [2021-05-06 11:36:12,932 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:12,932 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2116106146] [2021-05-06 11:36:12,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:12,935 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:36:12,936 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:12,937 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:12,940 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:36:12,944 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:36:12,964 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:36:12,979 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:12,979 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:36:12,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:13,382 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:13,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:13,401 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:13,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:13,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:13,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:13,507 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:13,507 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2116106146] [2021-05-06 11:36:13,507 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2116106146] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:13,507 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:13,507 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 11:36:13,507 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088254258] [2021-05-06 11:36:13,508 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 11:36:13,508 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:13,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 11:36:13,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=569, Invalid=837, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 11:36:13,508 INFO L87 Difference]: Start difference. First operand 80 states and 81 transitions. Second operand has 38 states, 38 states have (on average 1.9736842105263157) internal successors, (75), 36 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) [2021-05-06 11:36:15,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:15,887 INFO L93 Difference]: Finished difference Result 178 states and 209 transitions. [2021-05-06 11:36:15,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-05-06 11:36:15,887 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.9736842105263157) internal successors, (75), 36 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 [2021-05-06 11:36:15,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:15,888 INFO L225 Difference]: With dead ends: 178 [2021-05-06 11:36:15,888 INFO L226 Difference]: Without dead ends: 172 [2021-05-06 11:36:15,889 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2728 ImplicationChecksByTransitivity, 2266.2ms TimeCoverageRelationStatistics Valid=3379, Invalid=7333, Unknown=0, NotChecked=0, Total=10712 [2021-05-06 11:36:15,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-05-06 11:36:15,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 82. [2021-05-06 11:36:15,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 77 states have (on average 1.025974025974026) internal successors, (79), 77 states have internal predecessors, (79), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:15,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2021-05-06 11:36:15,899 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 79 [2021-05-06 11:36:15,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:15,900 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2021-05-06 11:36:15,900 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 1.9736842105263157) internal successors, (75), 36 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) [2021-05-06 11:36:15,900 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2021-05-06 11:36:15,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-06 11:36:15,900 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:15,900 INFO L523 BasicCegarLoop]: trace histogram [32, 31, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:15,900 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-05-06 11:36:15,900 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:15,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:15,901 INFO L82 PathProgramCache]: Analyzing trace with hash 1068751395, now seen corresponding path program 31 times [2021-05-06 11:36:15,901 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:15,901 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1964373661] [2021-05-06 11:36:15,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:15,904 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:36:15,905 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:15,906 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:15,909 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:36:15,913 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:36:15,933 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:36:15,949 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:15,950 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:36:15,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:16,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:16,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:16,431 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:16,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:16,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:16,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:16,502 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:16,503 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1964373661] [2021-05-06 11:36:16,503 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1964373661] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:16,503 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:16,503 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 11:36:16,503 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1109874706] [2021-05-06 11:36:16,503 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 11:36:16,503 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:16,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 11:36:16,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=603, Invalid=879, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 11:36:16,504 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand has 39 states, 39 states have (on average 1.9743589743589745) internal successors, (77), 37 states have internal predecessors, (77), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:18,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:18,953 INFO L93 Difference]: Finished difference Result 183 states and 215 transitions. [2021-05-06 11:36:18,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-06 11:36:18,954 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.9743589743589745) internal successors, (77), 37 states have internal predecessors, (77), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 81 [2021-05-06 11:36:18,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:18,955 INFO L225 Difference]: With dead ends: 183 [2021-05-06 11:36:18,955 INFO L226 Difference]: Without dead ends: 177 [2021-05-06 11:36:18,955 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2896 ImplicationChecksByTransitivity, 2408.1ms TimeCoverageRelationStatistics Valid=3583, Invalid=7759, Unknown=0, NotChecked=0, Total=11342 [2021-05-06 11:36:18,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2021-05-06 11:36:18,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 84. [2021-05-06 11:36:18,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 79 states have (on average 1.0253164556962024) internal successors, (81), 79 states have internal predecessors, (81), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:18,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 85 transitions. [2021-05-06 11:36:18,967 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 85 transitions. Word has length 81 [2021-05-06 11:36:18,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:18,967 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 85 transitions. [2021-05-06 11:36:18,967 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.9743589743589745) internal successors, (77), 37 states have internal predecessors, (77), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:18,967 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 85 transitions. [2021-05-06 11:36:18,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-06 11:36:18,968 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:18,968 INFO L523 BasicCegarLoop]: trace histogram [33, 32, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:18,968 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-05-06 11:36:18,968 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:18,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:18,968 INFO L82 PathProgramCache]: Analyzing trace with hash 214411038, now seen corresponding path program 32 times [2021-05-06 11:36:18,968 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:18,968 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [559429894] [2021-05-06 11:36:18,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:18,972 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:36:18,973 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:18,973 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:18,977 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:36:18,980 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:36:19,000 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:36:19,015 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:19,016 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:36:19,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:19,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:19,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:19,534 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:19,535 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:19,536 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:19,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:19,614 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:19,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [559429894] [2021-05-06 11:36:19,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [559429894] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:19,614 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:19,614 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-06 11:36:19,615 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1539025182] [2021-05-06 11:36:19,615 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 11:36:19,615 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:19,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 11:36:19,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=638, Invalid=922, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 11:36:19,616 INFO L87 Difference]: Start difference. First operand 84 states and 85 transitions. Second operand has 40 states, 40 states have (on average 1.975) internal successors, (79), 38 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:22,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:22,224 INFO L93 Difference]: Finished difference Result 188 states and 221 transitions. [2021-05-06 11:36:22,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-05-06 11:36:22,224 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.975) internal successors, (79), 38 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2021-05-06 11:36:22,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:22,225 INFO L225 Difference]: With dead ends: 188 [2021-05-06 11:36:22,225 INFO L226 Difference]: Without dead ends: 182 [2021-05-06 11:36:22,226 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3069 ImplicationChecksByTransitivity, 2539.9ms TimeCoverageRelationStatistics Valid=3793, Invalid=8197, Unknown=0, NotChecked=0, Total=11990 [2021-05-06 11:36:22,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-05-06 11:36:22,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 86. [2021-05-06 11:36:22,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 81 states have (on average 1.0246913580246915) internal successors, (83), 81 states have internal predecessors, (83), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:22,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 87 transitions. [2021-05-06 11:36:22,237 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 87 transitions. Word has length 83 [2021-05-06 11:36:22,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:22,237 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 87 transitions. [2021-05-06 11:36:22,237 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 1.975) internal successors, (79), 38 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:22,237 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 87 transitions. [2021-05-06 11:36:22,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 11:36:22,238 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:22,238 INFO L523 BasicCegarLoop]: trace histogram [34, 33, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:22,238 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-05-06 11:36:22,238 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:22,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:22,238 INFO L82 PathProgramCache]: Analyzing trace with hash -467918503, now seen corresponding path program 33 times [2021-05-06 11:36:22,238 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:22,238 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1131405595] [2021-05-06 11:36:22,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:22,242 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:36:22,243 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:22,243 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:22,247 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:36:22,251 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:36:22,271 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:36:22,287 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:22,287 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:36:22,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:22,840 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:22,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:22,843 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:22,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:22,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:22,866 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:22,917 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:22,918 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1131405595] [2021-05-06 11:36:22,918 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1131405595] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:22,918 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:22,918 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 11:36:22,918 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289381372] [2021-05-06 11:36:22,918 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 11:36:22,918 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:22,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 11:36:22,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=674, Invalid=966, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 11:36:22,919 INFO L87 Difference]: Start difference. First operand 86 states and 87 transitions. Second operand has 41 states, 41 states have (on average 1.975609756097561) internal successors, (81), 39 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:25,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:25,643 INFO L93 Difference]: Finished difference Result 193 states and 227 transitions. [2021-05-06 11:36:25,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-05-06 11:36:25,644 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.975609756097561) internal successors, (81), 39 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 85 [2021-05-06 11:36:25,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:25,644 INFO L225 Difference]: With dead ends: 193 [2021-05-06 11:36:25,645 INFO L226 Difference]: Without dead ends: 187 [2021-05-06 11:36:25,645 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3247 ImplicationChecksByTransitivity, 2656.3ms TimeCoverageRelationStatistics Valid=4009, Invalid=8647, Unknown=0, NotChecked=0, Total=12656 [2021-05-06 11:36:25,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-05-06 11:36:25,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 88. [2021-05-06 11:36:25,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 83 states have (on average 1.0240963855421688) internal successors, (85), 83 states have internal predecessors, (85), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:25,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2021-05-06 11:36:25,657 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 85 [2021-05-06 11:36:25,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:25,657 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2021-05-06 11:36:25,658 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 1.975609756097561) internal successors, (81), 39 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:25,658 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2021-05-06 11:36:25,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-05-06 11:36:25,658 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:25,658 INFO L523 BasicCegarLoop]: trace histogram [35, 34, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:25,658 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-05-06 11:36:25,658 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:25,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:25,658 INFO L82 PathProgramCache]: Analyzing trace with hash 943388884, now seen corresponding path program 34 times [2021-05-06 11:36:25,659 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:25,659 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2137600974] [2021-05-06 11:36:25,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:25,662 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:36:25,663 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:25,664 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:25,667 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:36:25,671 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:36:25,691 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:36:25,706 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:25,707 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:36:25,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:26,282 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:26,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:26,285 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:26,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:26,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:26,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:26,367 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:26,368 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2137600974] [2021-05-06 11:36:26,368 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2137600974] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:26,368 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:26,368 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-06 11:36:26,368 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316079733] [2021-05-06 11:36:26,368 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 11:36:26,368 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:26,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 11:36:26,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=711, Invalid=1011, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 11:36:26,369 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand has 42 states, 42 states have (on average 1.9761904761904763) internal successors, (83), 40 states have internal predecessors, (83), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:29,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:29,183 INFO L93 Difference]: Finished difference Result 198 states and 233 transitions. [2021-05-06 11:36:29,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-05-06 11:36:29,183 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.9761904761904763) internal successors, (83), 40 states have internal predecessors, (83), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 87 [2021-05-06 11:36:29,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:29,184 INFO L225 Difference]: With dead ends: 198 [2021-05-06 11:36:29,184 INFO L226 Difference]: Without dead ends: 192 [2021-05-06 11:36:29,185 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3430 ImplicationChecksByTransitivity, 2786.1ms TimeCoverageRelationStatistics Valid=4231, Invalid=9109, Unknown=0, NotChecked=0, Total=13340 [2021-05-06 11:36:29,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2021-05-06 11:36:29,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 90. [2021-05-06 11:36:29,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 85 states have (on average 1.0235294117647058) internal successors, (87), 85 states have internal predecessors, (87), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:29,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 91 transitions. [2021-05-06 11:36:29,205 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 91 transitions. Word has length 87 [2021-05-06 11:36:29,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:29,205 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 91 transitions. [2021-05-06 11:36:29,206 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 1.9761904761904763) internal successors, (83), 40 states have internal predecessors, (83), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:29,206 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 91 transitions. [2021-05-06 11:36:29,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-06 11:36:29,206 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:29,206 INFO L523 BasicCegarLoop]: trace histogram [36, 35, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:29,206 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2021-05-06 11:36:29,206 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:29,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:29,206 INFO L82 PathProgramCache]: Analyzing trace with hash 122255, now seen corresponding path program 35 times [2021-05-06 11:36:29,207 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:29,207 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2133231974] [2021-05-06 11:36:29,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:29,210 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:36:29,211 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:29,212 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:29,215 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:36:29,219 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:36:29,240 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:36:29,255 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:29,256 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:36:29,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:29,866 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:29,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:29,869 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:29,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:29,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:29,893 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:29,946 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:29,946 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2133231974] [2021-05-06 11:36:29,947 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2133231974] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:29,947 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:29,947 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-06 11:36:29,947 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003347622] [2021-05-06 11:36:29,947 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-06 11:36:29,947 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:29,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-06 11:36:29,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=749, Invalid=1057, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 11:36:29,948 INFO L87 Difference]: Start difference. First operand 90 states and 91 transitions. Second operand has 43 states, 43 states have (on average 1.9767441860465116) internal successors, (85), 41 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:32,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:32,926 INFO L93 Difference]: Finished difference Result 203 states and 239 transitions. [2021-05-06 11:36:32,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-05-06 11:36:32,927 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.9767441860465116) internal successors, (85), 41 states have internal predecessors, (85), 2 states have call successors, (3), 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 89 [2021-05-06 11:36:32,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:32,928 INFO L225 Difference]: With dead ends: 203 [2021-05-06 11:36:32,928 INFO L226 Difference]: Without dead ends: 197 [2021-05-06 11:36:32,928 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3618 ImplicationChecksByTransitivity, 2896.2ms TimeCoverageRelationStatistics Valid=4459, Invalid=9583, Unknown=0, NotChecked=0, Total=14042 [2021-05-06 11:36:32,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-05-06 11:36:32,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 92. [2021-05-06 11:36:32,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 87 states have (on average 1.0229885057471264) internal successors, (89), 87 states have internal predecessors, (89), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:32,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 93 transitions. [2021-05-06 11:36:32,941 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 93 transitions. Word has length 89 [2021-05-06 11:36:32,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:32,942 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 93 transitions. [2021-05-06 11:36:32,942 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 1.9767441860465116) internal successors, (85), 41 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:32,942 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 93 transitions. [2021-05-06 11:36:32,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-06 11:36:32,942 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:32,942 INFO L523 BasicCegarLoop]: trace histogram [37, 36, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:32,942 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-05-06 11:36:32,942 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:32,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:32,942 INFO L82 PathProgramCache]: Analyzing trace with hash -241008758, now seen corresponding path program 36 times [2021-05-06 11:36:32,942 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:32,943 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1758680775] [2021-05-06 11:36:32,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:32,946 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:36:32,961 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:32,962 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:32,965 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:36:32,969 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:36:32,978 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:36:32,993 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:32,994 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:36:33,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:33,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:33,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:33,635 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:33,636 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:33,637 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:33,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:33,714 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:33,715 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1758680775] [2021-05-06 11:36:33,715 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1758680775] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:33,715 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:33,715 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-06 11:36:33,715 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897915346] [2021-05-06 11:36:33,715 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 11:36:33,715 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:33,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 11:36:33,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=788, Invalid=1104, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 11:36:33,716 INFO L87 Difference]: Start difference. First operand 92 states and 93 transitions. Second operand has 44 states, 44 states have (on average 1.9772727272727273) internal successors, (87), 42 states have internal predecessors, (87), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:36,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:36,861 INFO L93 Difference]: Finished difference Result 208 states and 245 transitions. [2021-05-06 11:36:36,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-05-06 11:36:36,862 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.9772727272727273) internal successors, (87), 42 states have internal predecessors, (87), 2 states have call successors, (3), 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 91 [2021-05-06 11:36:36,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:36,862 INFO L225 Difference]: With dead ends: 208 [2021-05-06 11:36:36,862 INFO L226 Difference]: Without dead ends: 202 [2021-05-06 11:36:36,863 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3811 ImplicationChecksByTransitivity, 3052.6ms TimeCoverageRelationStatistics Valid=4693, Invalid=10069, Unknown=0, NotChecked=0, Total=14762 [2021-05-06 11:36:36,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2021-05-06 11:36:36,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 94. [2021-05-06 11:36:36,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 89 states have (on average 1.0224719101123596) internal successors, (91), 89 states have internal predecessors, (91), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:36,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2021-05-06 11:36:36,878 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 91 [2021-05-06 11:36:36,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:36,878 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2021-05-06 11:36:36,878 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 1.9772727272727273) internal successors, (87), 42 states have internal predecessors, (87), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:36,878 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2021-05-06 11:36:36,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-06 11:36:36,878 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:36,878 INFO L523 BasicCegarLoop]: trace histogram [38, 37, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:36,878 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-05-06 11:36:36,878 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:36,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:36,879 INFO L82 PathProgramCache]: Analyzing trace with hash -39678267, now seen corresponding path program 37 times [2021-05-06 11:36:36,879 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:36,879 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [775447791] [2021-05-06 11:36:36,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:36,882 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:36:36,883 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:36,883 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:36,887 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:36:36,891 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:36:36,911 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:36:36,927 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:36,927 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:36:36,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:37,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:37,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:37,608 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:37,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:37,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:37,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:37,690 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:37,690 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [775447791] [2021-05-06 11:36:37,690 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [775447791] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:37,690 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:37,690 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2021-05-06 11:36:37,690 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466088891] [2021-05-06 11:36:37,690 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-06 11:36:37,690 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:37,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-06 11:36:37,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=828, Invalid=1152, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 11:36:37,691 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand has 45 states, 45 states have (on average 1.9777777777777779) internal successors, (89), 43 states have internal predecessors, (89), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:41,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:41,069 INFO L93 Difference]: Finished difference Result 213 states and 251 transitions. [2021-05-06 11:36:41,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-05-06 11:36:41,069 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.9777777777777779) internal successors, (89), 43 states have internal predecessors, (89), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 93 [2021-05-06 11:36:41,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:41,070 INFO L225 Difference]: With dead ends: 213 [2021-05-06 11:36:41,070 INFO L226 Difference]: Without dead ends: 207 [2021-05-06 11:36:41,071 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4009 ImplicationChecksByTransitivity, 3156.2ms TimeCoverageRelationStatistics Valid=4933, Invalid=10567, Unknown=0, NotChecked=0, Total=15500 [2021-05-06 11:36:41,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2021-05-06 11:36:41,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 96. [2021-05-06 11:36:41,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 91 states have (on average 1.021978021978022) internal successors, (93), 91 states have internal predecessors, (93), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:41,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 97 transitions. [2021-05-06 11:36:41,116 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 97 transitions. Word has length 93 [2021-05-06 11:36:41,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:41,117 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 97 transitions. [2021-05-06 11:36:41,117 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 1.9777777777777779) internal successors, (89), 43 states have internal predecessors, (89), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:41,117 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 97 transitions. [2021-05-06 11:36:41,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-06 11:36:41,117 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:41,117 INFO L523 BasicCegarLoop]: trace histogram [39, 38, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:41,117 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-05-06 11:36:41,117 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:41,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:41,118 INFO L82 PathProgramCache]: Analyzing trace with hash 165395264, now seen corresponding path program 38 times [2021-05-06 11:36:41,118 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:41,118 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1000094241] [2021-05-06 11:36:41,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:41,126 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:36:41,142 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:41,142 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:41,146 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:36:41,150 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:36:41,167 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:36:41,182 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:41,183 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:36:41,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:41,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:41,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:41,929 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:41,930 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:41,930 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:41,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:42,012 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:42,012 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1000094241] [2021-05-06 11:36:42,012 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1000094241] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:42,012 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:42,012 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2021-05-06 11:36:42,012 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [716360609] [2021-05-06 11:36:42,013 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-06 11:36:42,013 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:42,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-06 11:36:42,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=869, Invalid=1201, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 11:36:42,013 INFO L87 Difference]: Start difference. First operand 96 states and 97 transitions. Second operand has 46 states, 46 states have (on average 1.9782608695652173) internal successors, (91), 44 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:45,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:45,386 INFO L93 Difference]: Finished difference Result 218 states and 257 transitions. [2021-05-06 11:36:45,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-05-06 11:36:45,387 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.9782608695652173) internal successors, (91), 44 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 95 [2021-05-06 11:36:45,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:45,387 INFO L225 Difference]: With dead ends: 218 [2021-05-06 11:36:45,387 INFO L226 Difference]: Without dead ends: 212 [2021-05-06 11:36:45,388 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4212 ImplicationChecksByTransitivity, 3289.0ms TimeCoverageRelationStatistics Valid=5179, Invalid=11077, Unknown=0, NotChecked=0, Total=16256 [2021-05-06 11:36:45,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-05-06 11:36:45,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 98. [2021-05-06 11:36:45,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 93 states have (on average 1.021505376344086) internal successors, (95), 93 states have internal predecessors, (95), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:45,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 99 transitions. [2021-05-06 11:36:45,403 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 99 transitions. Word has length 95 [2021-05-06 11:36:45,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:45,403 INFO L480 AbstractCegarLoop]: Abstraction has 98 states and 99 transitions. [2021-05-06 11:36:45,403 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 1.9782608695652173) internal successors, (91), 44 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:45,403 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 99 transitions. [2021-05-06 11:36:45,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-06 11:36:45,404 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:45,404 INFO L523 BasicCegarLoop]: trace histogram [40, 39, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:45,404 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-05-06 11:36:45,404 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:45,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:45,404 INFO L82 PathProgramCache]: Analyzing trace with hash -327437061, now seen corresponding path program 39 times [2021-05-06 11:36:45,404 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:45,404 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [898538496] [2021-05-06 11:36:45,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:45,408 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:36:45,408 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:45,409 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:45,413 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:36:45,416 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:36:45,437 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:36:45,452 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:45,453 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:36:45,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:46,180 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:46,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:46,182 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:46,183 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:46,183 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:46,207 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:46,265 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:46,265 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [898538496] [2021-05-06 11:36:46,265 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [898538496] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:46,265 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:46,265 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2021-05-06 11:36:46,265 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154578404] [2021-05-06 11:36:46,266 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-06 11:36:46,266 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:46,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-06 11:36:46,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=911, Invalid=1251, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 11:36:46,266 INFO L87 Difference]: Start difference. First operand 98 states and 99 transitions. Second operand has 47 states, 47 states have (on average 1.9787234042553192) internal successors, (93), 45 states have internal predecessors, (93), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:49,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:49,758 INFO L93 Difference]: Finished difference Result 223 states and 263 transitions. [2021-05-06 11:36:49,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-05-06 11:36:49,758 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.9787234042553192) internal successors, (93), 45 states have internal predecessors, (93), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 97 [2021-05-06 11:36:49,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:49,759 INFO L225 Difference]: With dead ends: 223 [2021-05-06 11:36:49,759 INFO L226 Difference]: Without dead ends: 217 [2021-05-06 11:36:49,760 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4420 ImplicationChecksByTransitivity, 3396.1ms TimeCoverageRelationStatistics Valid=5431, Invalid=11599, Unknown=0, NotChecked=0, Total=17030 [2021-05-06 11:36:49,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2021-05-06 11:36:49,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 100. [2021-05-06 11:36:49,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 95 states have (on average 1.0210526315789474) internal successors, (97), 95 states have internal predecessors, (97), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:49,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2021-05-06 11:36:49,776 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 97 [2021-05-06 11:36:49,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:49,776 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2021-05-06 11:36:49,776 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 1.9787234042553192) internal successors, (93), 45 states have internal predecessors, (93), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:49,776 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2021-05-06 11:36:49,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-06 11:36:49,776 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:49,777 INFO L523 BasicCegarLoop]: trace histogram [41, 40, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:49,777 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-05-06 11:36:49,777 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:49,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:49,777 INFO L82 PathProgramCache]: Analyzing trace with hash -1492898826, now seen corresponding path program 40 times [2021-05-06 11:36:49,777 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:49,777 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [847201602] [2021-05-06 11:36:49,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:49,781 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:36:49,781 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:49,782 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:49,785 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:36:49,789 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:36:49,810 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:36:49,825 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:49,826 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:36:49,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:50,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:50,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:50,590 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:50,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:50,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:50,616 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:50,676 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:50,676 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [847201602] [2021-05-06 11:36:50,676 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [847201602] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:50,676 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:50,676 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2021-05-06 11:36:50,676 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108567596] [2021-05-06 11:36:50,677 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-06 11:36:50,677 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:50,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-06 11:36:50,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=954, Invalid=1302, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 11:36:50,677 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand has 48 states, 48 states have (on average 1.9791666666666667) internal successors, (95), 46 states have internal predecessors, (95), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:54,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:54,298 INFO L93 Difference]: Finished difference Result 228 states and 269 transitions. [2021-05-06 11:36:54,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2021-05-06 11:36:54,298 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.9791666666666667) internal successors, (95), 46 states have internal predecessors, (95), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 99 [2021-05-06 11:36:54,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:54,299 INFO L225 Difference]: With dead ends: 228 [2021-05-06 11:36:54,299 INFO L226 Difference]: Without dead ends: 222 [2021-05-06 11:36:54,301 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4633 ImplicationChecksByTransitivity, 3479.4ms TimeCoverageRelationStatistics Valid=5689, Invalid=12133, Unknown=0, NotChecked=0, Total=17822 [2021-05-06 11:36:54,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2021-05-06 11:36:54,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 102. [2021-05-06 11:36:54,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 97 states have (on average 1.0206185567010309) internal successors, (99), 97 states have internal predecessors, (99), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:54,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 103 transitions. [2021-05-06 11:36:54,334 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 103 transitions. Word has length 99 [2021-05-06 11:36:54,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:54,335 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 103 transitions. [2021-05-06 11:36:54,336 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 1.9791666666666667) internal successors, (95), 46 states have internal predecessors, (95), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:54,336 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 103 transitions. [2021-05-06 11:36:54,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-06 11:36:54,336 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:54,336 INFO L523 BasicCegarLoop]: trace histogram [42, 41, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:54,336 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2021-05-06 11:36:54,336 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:54,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:54,340 INFO L82 PathProgramCache]: Analyzing trace with hash -515190735, now seen corresponding path program 41 times [2021-05-06 11:36:54,340 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:54,340 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2016427606] [2021-05-06 11:36:54,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:54,348 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:36:54,349 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:54,349 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:54,353 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:36:54,357 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:36:54,378 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:36:54,393 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:54,394 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:36:54,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:55,276 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:36:55,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:36:55,279 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:36:55,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:55,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:55,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:36:55,366 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:36:55,366 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2016427606] [2021-05-06 11:36:55,366 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2016427606] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:36:55,366 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:36:55,366 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2021-05-06 11:36:55,366 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966070129] [2021-05-06 11:36:55,367 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-06 11:36:55,367 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:36:55,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-06 11:36:55,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=998, Invalid=1354, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 11:36:55,367 INFO L87 Difference]: Start difference. First operand 102 states and 103 transitions. Second operand has 49 states, 49 states have (on average 1.9795918367346939) internal successors, (97), 47 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:59,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:36:59,251 INFO L93 Difference]: Finished difference Result 233 states and 275 transitions. [2021-05-06 11:36:59,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2021-05-06 11:36:59,251 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.9795918367346939) internal successors, (97), 47 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2021-05-06 11:36:59,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:36:59,252 INFO L225 Difference]: With dead ends: 233 [2021-05-06 11:36:59,252 INFO L226 Difference]: Without dead ends: 227 [2021-05-06 11:36:59,253 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4851 ImplicationChecksByTransitivity, 3767.2ms TimeCoverageRelationStatistics Valid=5953, Invalid=12679, Unknown=0, NotChecked=0, Total=18632 [2021-05-06 11:36:59,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-05-06 11:36:59,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 104. [2021-05-06 11:36:59,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 99 states have (on average 1.02020202020202) internal successors, (101), 99 states have internal predecessors, (101), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:59,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 105 transitions. [2021-05-06 11:36:59,270 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 105 transitions. Word has length 101 [2021-05-06 11:36:59,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:36:59,270 INFO L480 AbstractCegarLoop]: Abstraction has 104 states and 105 transitions. [2021-05-06 11:36:59,270 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 1.9795918367346939) internal successors, (97), 47 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:36:59,270 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 105 transitions. [2021-05-06 11:36:59,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-05-06 11:36:59,270 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:36:59,271 INFO L523 BasicCegarLoop]: trace histogram [43, 42, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:36:59,271 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2021-05-06 11:36:59,271 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:36:59,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:36:59,271 INFO L82 PathProgramCache]: Analyzing trace with hash -1535553108, now seen corresponding path program 42 times [2021-05-06 11:36:59,271 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:36:59,271 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [742476748] [2021-05-06 11:36:59,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:36:59,275 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:36:59,275 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:59,276 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:36:59,279 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:36:59,283 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:36:59,303 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:36:59,319 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:36:59,319 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:36:59,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:00,177 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:37:00,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:00,179 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:37:00,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:00,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:00,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:00,270 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:37:00,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [742476748] [2021-05-06 11:37:00,270 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [742476748] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:37:00,270 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:37:00,270 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2021-05-06 11:37:00,270 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097802273] [2021-05-06 11:37:00,270 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-06 11:37:00,270 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:37:00,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-06 11:37:00,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1043, Invalid=1407, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 11:37:00,271 INFO L87 Difference]: Start difference. First operand 104 states and 105 transitions. Second operand has 50 states, 50 states have (on average 1.98) internal successors, (99), 48 states have internal predecessors, (99), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:04,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:37:04,301 INFO L93 Difference]: Finished difference Result 238 states and 281 transitions. [2021-05-06 11:37:04,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2021-05-06 11:37:04,301 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.98) internal successors, (99), 48 states have internal predecessors, (99), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 103 [2021-05-06 11:37:04,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:37:04,302 INFO L225 Difference]: With dead ends: 238 [2021-05-06 11:37:04,302 INFO L226 Difference]: Without dead ends: 232 [2021-05-06 11:37:04,303 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5074 ImplicationChecksByTransitivity, 3865.7ms TimeCoverageRelationStatistics Valid=6223, Invalid=13237, Unknown=0, NotChecked=0, Total=19460 [2021-05-06 11:37:04,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2021-05-06 11:37:04,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 106. [2021-05-06 11:37:04,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 101 states have (on average 1.0198019801980198) internal successors, (103), 101 states have internal predecessors, (103), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:04,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 107 transitions. [2021-05-06 11:37:04,320 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 107 transitions. Word has length 103 [2021-05-06 11:37:04,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:37:04,321 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 107 transitions. [2021-05-06 11:37:04,321 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 1.98) internal successors, (99), 48 states have internal predecessors, (99), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:04,321 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 107 transitions. [2021-05-06 11:37:04,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-06 11:37:04,321 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:37:04,321 INFO L523 BasicCegarLoop]: trace histogram [44, 43, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:37:04,321 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-05-06 11:37:04,321 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:37:04,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:37:04,321 INFO L82 PathProgramCache]: Analyzing trace with hash 1443717223, now seen corresponding path program 43 times [2021-05-06 11:37:04,322 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:37:04,322 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1772537053] [2021-05-06 11:37:04,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:37:04,325 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:37:04,326 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:04,326 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:04,330 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:37:04,333 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:37:04,353 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:37:04,369 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:04,369 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:37:04,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:05,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:37:05,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:05,271 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:37:05,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:05,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:05,299 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:05,363 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:37:05,363 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1772537053] [2021-05-06 11:37:05,363 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1772537053] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:37:05,363 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:37:05,363 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2021-05-06 11:37:05,363 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873632039] [2021-05-06 11:37:05,363 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-06 11:37:05,363 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:37:05,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-06 11:37:05,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1089, Invalid=1461, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 11:37:05,364 INFO L87 Difference]: Start difference. First operand 106 states and 107 transitions. Second operand has 51 states, 51 states have (on average 1.9803921568627452) internal successors, (101), 49 states have internal predecessors, (101), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:09,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:37:09,547 INFO L93 Difference]: Finished difference Result 243 states and 287 transitions. [2021-05-06 11:37:09,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2021-05-06 11:37:09,548 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.9803921568627452) internal successors, (101), 49 states have internal predecessors, (101), 2 states have call successors, (3), 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 105 [2021-05-06 11:37:09,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:37:09,549 INFO L225 Difference]: With dead ends: 243 [2021-05-06 11:37:09,549 INFO L226 Difference]: Without dead ends: 237 [2021-05-06 11:37:09,549 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5302 ImplicationChecksByTransitivity, 4009.3ms TimeCoverageRelationStatistics Valid=6499, Invalid=13807, Unknown=0, NotChecked=0, Total=20306 [2021-05-06 11:37:09,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2021-05-06 11:37:09,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 108. [2021-05-06 11:37:09,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 103 states have (on average 1.0194174757281553) internal successors, (105), 103 states have internal predecessors, (105), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:09,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2021-05-06 11:37:09,582 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 105 [2021-05-06 11:37:09,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:37:09,582 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2021-05-06 11:37:09,582 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 1.9803921568627452) internal successors, (101), 49 states have internal predecessors, (101), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:09,582 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2021-05-06 11:37:09,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-06 11:37:09,582 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:37:09,582 INFO L523 BasicCegarLoop]: trace histogram [45, 44, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:37:09,582 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2021-05-06 11:37:09,582 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:37:09,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:37:09,583 INFO L82 PathProgramCache]: Analyzing trace with hash -220681118, now seen corresponding path program 44 times [2021-05-06 11:37:09,583 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:37:09,583 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1296217623] [2021-05-06 11:37:09,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:37:09,587 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:37:09,603 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:09,603 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:09,607 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:37:09,611 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:37:09,620 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:37:09,637 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:09,638 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:37:09,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:10,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:37:10,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:10,576 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:37:10,577 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:10,578 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:10,604 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:10,669 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:37:10,669 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1296217623] [2021-05-06 11:37:10,670 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1296217623] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:37:10,670 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:37:10,670 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2021-05-06 11:37:10,670 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1341458924] [2021-05-06 11:37:10,670 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-06 11:37:10,670 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:37:10,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-06 11:37:10,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1136, Invalid=1516, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 11:37:10,671 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand has 52 states, 52 states have (on average 1.9807692307692308) internal successors, (103), 50 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:15,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:37:15,168 INFO L93 Difference]: Finished difference Result 248 states and 293 transitions. [2021-05-06 11:37:15,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2021-05-06 11:37:15,168 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.9807692307692308) internal successors, (103), 50 states have internal predecessors, (103), 2 states have call successors, (3), 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 107 [2021-05-06 11:37:15,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:37:15,169 INFO L225 Difference]: With dead ends: 248 [2021-05-06 11:37:15,169 INFO L226 Difference]: Without dead ends: 242 [2021-05-06 11:37:15,170 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5535 ImplicationChecksByTransitivity, 4259.3ms TimeCoverageRelationStatistics Valid=6781, Invalid=14389, Unknown=0, NotChecked=0, Total=21170 [2021-05-06 11:37:15,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2021-05-06 11:37:15,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 110. [2021-05-06 11:37:15,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 105 states have (on average 1.019047619047619) internal successors, (107), 105 states have internal predecessors, (107), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:15,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 111 transitions. [2021-05-06 11:37:15,189 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 111 transitions. Word has length 107 [2021-05-06 11:37:15,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:37:15,189 INFO L480 AbstractCegarLoop]: Abstraction has 110 states and 111 transitions. [2021-05-06 11:37:15,190 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 1.9807692307692308) internal successors, (103), 50 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:15,190 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 111 transitions. [2021-05-06 11:37:15,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-05-06 11:37:15,190 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:37:15,190 INFO L523 BasicCegarLoop]: trace histogram [46, 45, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:37:15,190 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2021-05-06 11:37:15,190 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:37:15,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:37:15,191 INFO L82 PathProgramCache]: Analyzing trace with hash -1979652707, now seen corresponding path program 45 times [2021-05-06 11:37:15,191 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:37:15,191 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1511207167] [2021-05-06 11:37:15,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:37:15,194 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:37:15,210 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:15,211 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:15,215 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:37:15,219 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:37:15,228 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:37:15,244 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:15,245 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:37:15,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:16,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:37:16,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:16,231 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:37:16,232 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:16,232 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:16,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:16,328 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:37:16,329 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1511207167] [2021-05-06 11:37:16,329 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1511207167] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:37:16,329 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:37:16,329 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2021-05-06 11:37:16,329 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964550737] [2021-05-06 11:37:16,329 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-06 11:37:16,329 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:37:16,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-06 11:37:16,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1184, Invalid=1572, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 11:37:16,330 INFO L87 Difference]: Start difference. First operand 110 states and 111 transitions. Second operand has 53 states, 53 states have (on average 1.9811320754716981) internal successors, (105), 51 states have internal predecessors, (105), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:20,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:37:20,892 INFO L93 Difference]: Finished difference Result 253 states and 299 transitions. [2021-05-06 11:37:20,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2021-05-06 11:37:20,892 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.9811320754716981) internal successors, (105), 51 states have internal predecessors, (105), 2 states have call successors, (3), 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 109 [2021-05-06 11:37:20,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:37:20,893 INFO L225 Difference]: With dead ends: 253 [2021-05-06 11:37:20,893 INFO L226 Difference]: Without dead ends: 247 [2021-05-06 11:37:20,894 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5773 ImplicationChecksByTransitivity, 4310.2ms TimeCoverageRelationStatistics Valid=7069, Invalid=14983, Unknown=0, NotChecked=0, Total=22052 [2021-05-06 11:37:20,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2021-05-06 11:37:20,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 112. [2021-05-06 11:37:20,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 107 states have (on average 1.0186915887850467) internal successors, (109), 107 states have internal predecessors, (109), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:20,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2021-05-06 11:37:20,914 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 109 [2021-05-06 11:37:20,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:37:20,914 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2021-05-06 11:37:20,914 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 1.9811320754716981) internal successors, (105), 51 states have internal predecessors, (105), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:20,914 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2021-05-06 11:37:20,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-05-06 11:37:20,915 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:37:20,915 INFO L523 BasicCegarLoop]: trace histogram [47, 46, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:37:20,915 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2021-05-06 11:37:20,915 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:37:20,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:37:20,915 INFO L82 PathProgramCache]: Analyzing trace with hash -134235112, now seen corresponding path program 46 times [2021-05-06 11:37:20,915 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:37:20,915 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1130371710] [2021-05-06 11:37:20,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:37:20,922 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:37:20,923 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:20,924 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:20,927 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:37:20,932 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:37:20,952 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:37:20,966 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:20,969 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:37:20,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:21,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:37:21,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:21,972 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:37:21,973 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:21,973 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:22,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:22,067 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:37:22,067 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1130371710] [2021-05-06 11:37:22,067 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1130371710] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:37:22,067 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:37:22,067 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2021-05-06 11:37:22,067 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189245831] [2021-05-06 11:37:22,067 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-06 11:37:22,067 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:37:22,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-06 11:37:22,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1233, Invalid=1629, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 11:37:22,068 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand has 54 states, 54 states have (on average 1.9814814814814814) internal successors, (107), 52 states have internal predecessors, (107), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:26,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:37:26,127 INFO L93 Difference]: Finished difference Result 258 states and 305 transitions. [2021-05-06 11:37:26,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2021-05-06 11:37:26,127 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.9814814814814814) internal successors, (107), 52 states have internal predecessors, (107), 2 states have call successors, (3), 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 111 [2021-05-06 11:37:26,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:37:26,128 INFO L225 Difference]: With dead ends: 258 [2021-05-06 11:37:26,128 INFO L226 Difference]: Without dead ends: 252 [2021-05-06 11:37:26,129 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6016 ImplicationChecksByTransitivity, 3888.8ms TimeCoverageRelationStatistics Valid=7363, Invalid=15589, Unknown=0, NotChecked=0, Total=22952 [2021-05-06 11:37:26,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2021-05-06 11:37:26,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 114. [2021-05-06 11:37:26,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 109 states have (on average 1.018348623853211) internal successors, (111), 109 states have internal predecessors, (111), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:26,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 115 transitions. [2021-05-06 11:37:26,149 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 115 transitions. Word has length 111 [2021-05-06 11:37:26,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:37:26,149 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 115 transitions. [2021-05-06 11:37:26,149 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 1.9814814814814814) internal successors, (107), 52 states have internal predecessors, (107), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:26,149 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 115 transitions. [2021-05-06 11:37:26,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-06 11:37:26,149 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:37:26,149 INFO L523 BasicCegarLoop]: trace histogram [48, 47, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:37:26,150 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2021-05-06 11:37:26,150 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:37:26,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:37:26,150 INFO L82 PathProgramCache]: Analyzing trace with hash -509419565, now seen corresponding path program 47 times [2021-05-06 11:37:26,150 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:37:26,150 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1891337275] [2021-05-06 11:37:26,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:37:26,154 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:37:26,169 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:26,170 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:26,174 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:37:26,177 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:37:26,186 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:37:26,214 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:26,215 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:37:26,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:27,311 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:37:27,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:27,313 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:37:27,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:27,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:27,342 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:27,410 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:37:27,410 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1891337275] [2021-05-06 11:37:27,410 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1891337275] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:37:27,411 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:37:27,411 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [55] imperfect sequences [] total 55 [2021-05-06 11:37:27,411 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434869698] [2021-05-06 11:37:27,411 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-06 11:37:27,411 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:37:27,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-06 11:37:27,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1283, Invalid=1687, Unknown=0, NotChecked=0, Total=2970 [2021-05-06 11:37:27,411 INFO L87 Difference]: Start difference. First operand 114 states and 115 transitions. Second operand has 55 states, 55 states have (on average 1.981818181818182) internal successors, (109), 53 states have internal predecessors, (109), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:32,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:37:32,423 INFO L93 Difference]: Finished difference Result 263 states and 311 transitions. [2021-05-06 11:37:32,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2021-05-06 11:37:32,423 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.981818181818182) internal successors, (109), 53 states have internal predecessors, (109), 2 states have call successors, (3), 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 113 [2021-05-06 11:37:32,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:37:32,424 INFO L225 Difference]: With dead ends: 263 [2021-05-06 11:37:32,424 INFO L226 Difference]: Without dead ends: 257 [2021-05-06 11:37:32,425 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6264 ImplicationChecksByTransitivity, 4767.9ms TimeCoverageRelationStatistics Valid=7663, Invalid=16207, Unknown=0, NotChecked=0, Total=23870 [2021-05-06 11:37:32,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2021-05-06 11:37:32,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 116. [2021-05-06 11:37:32,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 111 states have (on average 1.018018018018018) internal successors, (113), 111 states have internal predecessors, (113), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:32,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 117 transitions. [2021-05-06 11:37:32,447 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 117 transitions. Word has length 113 [2021-05-06 11:37:32,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:37:32,447 INFO L480 AbstractCegarLoop]: Abstraction has 116 states and 117 transitions. [2021-05-06 11:37:32,447 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 1.981818181818182) internal successors, (109), 53 states have internal predecessors, (109), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:32,447 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 117 transitions. [2021-05-06 11:37:32,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-05-06 11:37:32,447 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:37:32,447 INFO L523 BasicCegarLoop]: trace histogram [49, 48, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:37:32,447 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2021-05-06 11:37:32,447 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:37:32,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:37:32,448 INFO L82 PathProgramCache]: Analyzing trace with hash -284426034, now seen corresponding path program 48 times [2021-05-06 11:37:32,448 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:37:32,448 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [237588582] [2021-05-06 11:37:32,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:37:32,451 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:37:32,467 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:32,467 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:32,471 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:37:32,475 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:37:32,483 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:37:32,500 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:32,501 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:37:32,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:33,597 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:37:33,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:33,600 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:37:33,601 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:33,601 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:33,629 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:33,701 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:37:33,702 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [237588582] [2021-05-06 11:37:33,702 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [237588582] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:37:33,702 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:37:33,702 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [56] imperfect sequences [] total 56 [2021-05-06 11:37:33,702 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1797656140] [2021-05-06 11:37:33,702 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-06 11:37:33,702 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:37:33,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-06 11:37:33,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1334, Invalid=1746, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 11:37:33,703 INFO L87 Difference]: Start difference. First operand 116 states and 117 transitions. Second operand has 56 states, 56 states have (on average 1.9821428571428572) internal successors, (111), 54 states have internal predecessors, (111), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:38,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:37:38,924 INFO L93 Difference]: Finished difference Result 268 states and 317 transitions. [2021-05-06 11:37:38,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2021-05-06 11:37:38,924 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.9821428571428572) internal successors, (111), 54 states have internal predecessors, (111), 2 states have call successors, (3), 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 115 [2021-05-06 11:37:38,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:37:38,925 INFO L225 Difference]: With dead ends: 268 [2021-05-06 11:37:38,925 INFO L226 Difference]: Without dead ends: 262 [2021-05-06 11:37:38,926 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6517 ImplicationChecksByTransitivity, 4897.8ms TimeCoverageRelationStatistics Valid=7969, Invalid=16837, Unknown=0, NotChecked=0, Total=24806 [2021-05-06 11:37:38,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2021-05-06 11:37:38,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 118. [2021-05-06 11:37:38,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 113 states have (on average 1.0176991150442478) internal successors, (115), 113 states have internal predecessors, (115), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:38,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 119 transitions. [2021-05-06 11:37:38,948 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 119 transitions. Word has length 115 [2021-05-06 11:37:38,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:37:38,948 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 119 transitions. [2021-05-06 11:37:38,948 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 56 states have (on average 1.9821428571428572) internal successors, (111), 54 states have internal predecessors, (111), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:38,949 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 119 transitions. [2021-05-06 11:37:38,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-05-06 11:37:38,949 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:37:38,949 INFO L523 BasicCegarLoop]: trace histogram [50, 49, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:37:38,949 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2021-05-06 11:37:38,949 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:37:38,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:37:38,949 INFO L82 PathProgramCache]: Analyzing trace with hash 1185992457, now seen corresponding path program 49 times [2021-05-06 11:37:38,949 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:37:38,949 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [439220960] [2021-05-06 11:37:38,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:37:38,953 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:37:38,968 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:38,968 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:38,972 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:37:38,976 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:37:38,985 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:37:39,001 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:39,002 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:37:39,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:40,113 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:37:40,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:40,115 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:37:40,116 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:40,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:40,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:40,215 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:37:40,215 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [439220960] [2021-05-06 11:37:40,215 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [439220960] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:37:40,215 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:37:40,215 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2021-05-06 11:37:40,215 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980471498] [2021-05-06 11:37:40,216 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-06 11:37:40,216 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:37:40,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-06 11:37:40,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1386, Invalid=1806, Unknown=0, NotChecked=0, Total=3192 [2021-05-06 11:37:40,216 INFO L87 Difference]: Start difference. First operand 118 states and 119 transitions. Second operand has 57 states, 57 states have (on average 1.9824561403508771) internal successors, (113), 55 states have internal predecessors, (113), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:45,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:37:45,467 INFO L93 Difference]: Finished difference Result 273 states and 323 transitions. [2021-05-06 11:37:45,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2021-05-06 11:37:45,468 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.9824561403508771) internal successors, (113), 55 states have internal predecessors, (113), 2 states have call successors, (3), 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 117 [2021-05-06 11:37:45,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:37:45,469 INFO L225 Difference]: With dead ends: 273 [2021-05-06 11:37:45,469 INFO L226 Difference]: Without dead ends: 267 [2021-05-06 11:37:45,470 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6775 ImplicationChecksByTransitivity, 4951.1ms TimeCoverageRelationStatistics Valid=8281, Invalid=17479, Unknown=0, NotChecked=0, Total=25760 [2021-05-06 11:37:45,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2021-05-06 11:37:45,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 120. [2021-05-06 11:37:45,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 115 states have (on average 1.017391304347826) internal successors, (117), 115 states have internal predecessors, (117), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:45,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 121 transitions. [2021-05-06 11:37:45,492 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 121 transitions. Word has length 117 [2021-05-06 11:37:45,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:37:45,492 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 121 transitions. [2021-05-06 11:37:45,492 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 1.9824561403508771) internal successors, (113), 55 states have internal predecessors, (113), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:45,492 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 121 transitions. [2021-05-06 11:37:45,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-05-06 11:37:45,492 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:37:45,492 INFO L523 BasicCegarLoop]: trace histogram [51, 50, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:37:45,492 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2021-05-06 11:37:45,493 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:37:45,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:37:45,493 INFO L82 PathProgramCache]: Analyzing trace with hash 1213921924, now seen corresponding path program 50 times [2021-05-06 11:37:45,493 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:37:45,493 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1616363676] [2021-05-06 11:37:45,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:37:45,496 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:37:45,511 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:45,512 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:45,515 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:37:45,519 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:37:45,527 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:37:45,543 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:45,544 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:37:45,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:46,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:37:46,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:46,701 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:37:46,702 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:46,702 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:46,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:46,801 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:37:46,801 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1616363676] [2021-05-06 11:37:46,801 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1616363676] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:37:46,801 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:37:46,801 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [58] imperfect sequences [] total 58 [2021-05-06 11:37:46,801 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [95181499] [2021-05-06 11:37:46,802 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-06 11:37:46,802 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:37:46,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-06 11:37:46,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1439, Invalid=1867, Unknown=0, NotChecked=0, Total=3306 [2021-05-06 11:37:46,802 INFO L87 Difference]: Start difference. First operand 120 states and 121 transitions. Second operand has 58 states, 58 states have (on average 1.9827586206896552) internal successors, (115), 56 states have internal predecessors, (115), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:52,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:37:52,202 INFO L93 Difference]: Finished difference Result 278 states and 329 transitions. [2021-05-06 11:37:52,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2021-05-06 11:37:52,202 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.9827586206896552) internal successors, (115), 56 states have internal predecessors, (115), 2 states have call successors, (3), 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 119 [2021-05-06 11:37:52,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:37:52,203 INFO L225 Difference]: With dead ends: 278 [2021-05-06 11:37:52,203 INFO L226 Difference]: Without dead ends: 272 [2021-05-06 11:37:52,204 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7038 ImplicationChecksByTransitivity, 5130.4ms TimeCoverageRelationStatistics Valid=8599, Invalid=18133, Unknown=0, NotChecked=0, Total=26732 [2021-05-06 11:37:52,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2021-05-06 11:37:52,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 122. [2021-05-06 11:37:52,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 117 states have (on average 1.017094017094017) internal successors, (119), 117 states have internal predecessors, (119), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:52,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 123 transitions. [2021-05-06 11:37:52,227 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 123 transitions. Word has length 119 [2021-05-06 11:37:52,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:37:52,227 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 123 transitions. [2021-05-06 11:37:52,228 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 1.9827586206896552) internal successors, (115), 56 states have internal predecessors, (115), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:52,228 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 123 transitions. [2021-05-06 11:37:52,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-05-06 11:37:52,228 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:37:52,228 INFO L523 BasicCegarLoop]: trace histogram [52, 51, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:37:52,228 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2021-05-06 11:37:52,228 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:37:52,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:37:52,228 INFO L82 PathProgramCache]: Analyzing trace with hash -2010631361, now seen corresponding path program 51 times [2021-05-06 11:37:52,228 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:37:52,229 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [100350690] [2021-05-06 11:37:52,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:37:52,232 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:37:52,248 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:52,248 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:52,252 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:37:52,256 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:37:52,265 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:37:52,282 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:52,283 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:37:52,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:53,492 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:37:53,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:37:53,494 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:37:53,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:53,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:53,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:37:53,597 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:37:53,597 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [100350690] [2021-05-06 11:37:53,597 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [100350690] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:37:53,597 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:37:53,597 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [59] imperfect sequences [] total 59 [2021-05-06 11:37:53,597 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1532342108] [2021-05-06 11:37:53,597 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-06 11:37:53,597 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:37:53,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-06 11:37:53,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1493, Invalid=1929, Unknown=0, NotChecked=0, Total=3422 [2021-05-06 11:37:53,598 INFO L87 Difference]: Start difference. First operand 122 states and 123 transitions. Second operand has 59 states, 59 states have (on average 1.9830508474576272) internal successors, (117), 57 states have internal predecessors, (117), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:59,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:37:59,306 INFO L93 Difference]: Finished difference Result 283 states and 335 transitions. [2021-05-06 11:37:59,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2021-05-06 11:37:59,306 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.9830508474576272) internal successors, (117), 57 states have internal predecessors, (117), 2 states have call successors, (3), 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 121 [2021-05-06 11:37:59,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:37:59,307 INFO L225 Difference]: With dead ends: 283 [2021-05-06 11:37:59,307 INFO L226 Difference]: Without dead ends: 277 [2021-05-06 11:37:59,308 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7306 ImplicationChecksByTransitivity, 5341.2ms TimeCoverageRelationStatistics Valid=8923, Invalid=18799, Unknown=0, NotChecked=0, Total=27722 [2021-05-06 11:37:59,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2021-05-06 11:37:59,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 124. [2021-05-06 11:37:59,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 119 states have (on average 1.0168067226890756) internal successors, (121), 119 states have internal predecessors, (121), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:59,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 125 transitions. [2021-05-06 11:37:59,333 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 125 transitions. Word has length 121 [2021-05-06 11:37:59,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:37:59,334 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 125 transitions. [2021-05-06 11:37:59,334 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 1.9830508474576272) internal successors, (117), 57 states have internal predecessors, (117), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:37:59,334 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 125 transitions. [2021-05-06 11:37:59,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-05-06 11:37:59,334 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:37:59,334 INFO L523 BasicCegarLoop]: trace histogram [53, 52, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:37:59,335 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2021-05-06 11:37:59,335 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:37:59,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:37:59,335 INFO L82 PathProgramCache]: Analyzing trace with hash 160049466, now seen corresponding path program 52 times [2021-05-06 11:37:59,335 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:37:59,335 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1324931260] [2021-05-06 11:37:59,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:37:59,339 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:37:59,339 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:59,340 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:37:59,343 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:37:59,347 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:37:59,368 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:37:59,383 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:37:59,384 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:37:59,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:00,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:38:00,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:00,512 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:38:00,513 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:00,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:00,543 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:00,617 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:38:00,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1324931260] [2021-05-06 11:38:00,617 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1324931260] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:38:00,617 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:38:00,617 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [60] imperfect sequences [] total 60 [2021-05-06 11:38:00,618 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657354582] [2021-05-06 11:38:00,618 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-06 11:38:00,618 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:38:00,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-06 11:38:00,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1548, Invalid=1992, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 11:38:00,618 INFO L87 Difference]: Start difference. First operand 124 states and 125 transitions. Second operand has 60 states, 60 states have (on average 1.9833333333333334) internal successors, (119), 58 states have internal predecessors, (119), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:06,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:38:06,573 INFO L93 Difference]: Finished difference Result 288 states and 341 transitions. [2021-05-06 11:38:06,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2021-05-06 11:38:06,573 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 1.9833333333333334) internal successors, (119), 58 states have internal predecessors, (119), 2 states have call successors, (3), 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 123 [2021-05-06 11:38:06,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:38:06,575 INFO L225 Difference]: With dead ends: 288 [2021-05-06 11:38:06,575 INFO L226 Difference]: Without dead ends: 282 [2021-05-06 11:38:06,576 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7579 ImplicationChecksByTransitivity, 5309.1ms TimeCoverageRelationStatistics Valid=9253, Invalid=19477, Unknown=0, NotChecked=0, Total=28730 [2021-05-06 11:38:06,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2021-05-06 11:38:06,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 126. [2021-05-06 11:38:06,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 121 states have (on average 1.0165289256198347) internal successors, (123), 121 states have internal predecessors, (123), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:06,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 127 transitions. [2021-05-06 11:38:06,601 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 127 transitions. Word has length 123 [2021-05-06 11:38:06,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:38:06,601 INFO L480 AbstractCegarLoop]: Abstraction has 126 states and 127 transitions. [2021-05-06 11:38:06,602 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 60 states have (on average 1.9833333333333334) internal successors, (119), 58 states have internal predecessors, (119), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:06,602 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 127 transitions. [2021-05-06 11:38:06,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-06 11:38:06,606 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:38:06,606 INFO L523 BasicCegarLoop]: trace histogram [54, 53, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:38:06,606 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2021-05-06 11:38:06,607 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:38:06,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:38:06,607 INFO L82 PathProgramCache]: Analyzing trace with hash -1169781643, now seen corresponding path program 53 times [2021-05-06 11:38:06,607 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:38:06,607 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1737868874] [2021-05-06 11:38:06,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:38:06,613 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:38:06,629 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:06,629 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:06,633 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:38:06,636 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:38:06,645 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:38:06,661 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:38:06,662 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:38:06,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:07,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:38:07,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:07,847 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:38:07,848 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:07,849 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:07,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:07,953 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:38:07,953 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1737868874] [2021-05-06 11:38:07,953 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1737868874] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:38:07,953 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:38:07,953 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [61] imperfect sequences [] total 61 [2021-05-06 11:38:07,953 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919602689] [2021-05-06 11:38:07,953 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2021-05-06 11:38:07,953 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:38:07,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-05-06 11:38:07,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1604, Invalid=2056, Unknown=0, NotChecked=0, Total=3660 [2021-05-06 11:38:07,954 INFO L87 Difference]: Start difference. First operand 126 states and 127 transitions. Second operand has 61 states, 61 states have (on average 1.9836065573770492) internal successors, (121), 59 states have internal predecessors, (121), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:13,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:38:13,951 INFO L93 Difference]: Finished difference Result 293 states and 347 transitions. [2021-05-06 11:38:13,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2021-05-06 11:38:13,952 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.9836065573770492) internal successors, (121), 59 states have internal predecessors, (121), 2 states have call successors, (3), 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 125 [2021-05-06 11:38:13,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:38:13,952 INFO L225 Difference]: With dead ends: 293 [2021-05-06 11:38:13,953 INFO L226 Difference]: Without dead ends: 287 [2021-05-06 11:38:13,953 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7857 ImplicationChecksByTransitivity, 5388.9ms TimeCoverageRelationStatistics Valid=9589, Invalid=20167, Unknown=0, NotChecked=0, Total=29756 [2021-05-06 11:38:13,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2021-05-06 11:38:13,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 128. [2021-05-06 11:38:13,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 123 states have (on average 1.016260162601626) internal successors, (125), 123 states have internal predecessors, (125), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:13,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 129 transitions. [2021-05-06 11:38:13,979 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 129 transitions. Word has length 125 [2021-05-06 11:38:13,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:38:13,979 INFO L480 AbstractCegarLoop]: Abstraction has 128 states and 129 transitions. [2021-05-06 11:38:13,980 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 61 states, 61 states have (on average 1.9836065573770492) internal successors, (121), 59 states have internal predecessors, (121), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:13,980 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 129 transitions. [2021-05-06 11:38:13,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-05-06 11:38:13,980 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:38:13,980 INFO L523 BasicCegarLoop]: trace histogram [55, 54, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:38:13,980 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2021-05-06 11:38:13,980 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:38:13,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:38:13,980 INFO L82 PathProgramCache]: Analyzing trace with hash 762776816, now seen corresponding path program 54 times [2021-05-06 11:38:13,980 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:38:13,981 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [282322711] [2021-05-06 11:38:13,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:38:14,010 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:38:14,025 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:14,026 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:14,029 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:38:14,033 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:38:14,049 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:38:14,073 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:38:14,074 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:38:14,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:15,455 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:38:15,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:15,457 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:38:15,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:15,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:15,489 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:15,566 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:38:15,566 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [282322711] [2021-05-06 11:38:15,566 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [282322711] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:38:15,566 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:38:15,566 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [62] imperfect sequences [] total 62 [2021-05-06 11:38:15,566 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336220318] [2021-05-06 11:38:15,567 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-06 11:38:15,567 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:38:15,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-06 11:38:15,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1661, Invalid=2121, Unknown=0, NotChecked=0, Total=3782 [2021-05-06 11:38:15,567 INFO L87 Difference]: Start difference. First operand 128 states and 129 transitions. Second operand has 62 states, 62 states have (on average 1.9838709677419355) internal successors, (123), 60 states have internal predecessors, (123), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:21,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:38:21,899 INFO L93 Difference]: Finished difference Result 298 states and 353 transitions. [2021-05-06 11:38:21,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2021-05-06 11:38:21,900 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.9838709677419355) internal successors, (123), 60 states have internal predecessors, (123), 2 states have call successors, (3), 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 127 [2021-05-06 11:38:21,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:38:21,900 INFO L225 Difference]: With dead ends: 298 [2021-05-06 11:38:21,901 INFO L226 Difference]: Without dead ends: 292 [2021-05-06 11:38:21,902 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8140 ImplicationChecksByTransitivity, 5843.9ms TimeCoverageRelationStatistics Valid=9931, Invalid=20869, Unknown=0, NotChecked=0, Total=30800 [2021-05-06 11:38:21,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2021-05-06 11:38:21,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 130. [2021-05-06 11:38:21,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 125 states have (on average 1.016) internal successors, (127), 125 states have internal predecessors, (127), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:21,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2021-05-06 11:38:21,928 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 127 [2021-05-06 11:38:21,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:38:21,928 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2021-05-06 11:38:21,928 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 62 states, 62 states have (on average 1.9838709677419355) internal successors, (123), 60 states have internal predecessors, (123), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:21,928 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2021-05-06 11:38:21,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-05-06 11:38:21,929 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:38:21,929 INFO L523 BasicCegarLoop]: trace histogram [56, 55, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:38:21,929 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2021-05-06 11:38:21,929 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:38:21,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:38:21,929 INFO L82 PathProgramCache]: Analyzing trace with hash -1769383253, now seen corresponding path program 55 times [2021-05-06 11:38:21,929 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:38:21,929 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [379450553] [2021-05-06 11:38:21,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:38:21,933 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:38:21,934 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:21,934 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:21,946 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:38:21,949 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:38:21,970 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:38:21,985 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:38:21,986 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:38:21,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:23,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:38:23,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:23,357 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:38:23,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:23,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:23,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:23,465 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:38:23,465 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [379450553] [2021-05-06 11:38:23,465 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [379450553] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:38:23,465 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:38:23,465 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [63] imperfect sequences [] total 63 [2021-05-06 11:38:23,465 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733541428] [2021-05-06 11:38:23,465 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-06 11:38:23,465 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:38:23,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-06 11:38:23,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1719, Invalid=2187, Unknown=0, NotChecked=0, Total=3906 [2021-05-06 11:38:23,466 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand has 63 states, 63 states have (on average 1.9841269841269842) internal successors, (125), 61 states have internal predecessors, (125), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:30,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:38:30,092 INFO L93 Difference]: Finished difference Result 303 states and 359 transitions. [2021-05-06 11:38:30,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2021-05-06 11:38:30,092 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.9841269841269842) internal successors, (125), 61 states have internal predecessors, (125), 2 states have call successors, (3), 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 129 [2021-05-06 11:38:30,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:38:30,093 INFO L225 Difference]: With dead ends: 303 [2021-05-06 11:38:30,093 INFO L226 Difference]: Without dead ends: 297 [2021-05-06 11:38:30,094 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8428 ImplicationChecksByTransitivity, 6047.4ms TimeCoverageRelationStatistics Valid=10279, Invalid=21583, Unknown=0, NotChecked=0, Total=31862 [2021-05-06 11:38:30,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2021-05-06 11:38:30,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 132. [2021-05-06 11:38:30,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 127 states have (on average 1.015748031496063) internal successors, (129), 127 states have internal predecessors, (129), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:30,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 133 transitions. [2021-05-06 11:38:30,136 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 133 transitions. Word has length 129 [2021-05-06 11:38:30,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:38:30,136 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 133 transitions. [2021-05-06 11:38:30,136 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 63 states, 63 states have (on average 1.9841269841269842) internal successors, (125), 61 states have internal predecessors, (125), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:30,136 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 133 transitions. [2021-05-06 11:38:30,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-06 11:38:30,136 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:38:30,137 INFO L523 BasicCegarLoop]: trace histogram [57, 56, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:38:30,137 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2021-05-06 11:38:30,137 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:38:30,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:38:30,137 INFO L82 PathProgramCache]: Analyzing trace with hash 71247270, now seen corresponding path program 56 times [2021-05-06 11:38:30,137 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:38:30,137 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [138869094] [2021-05-06 11:38:30,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:38:30,141 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:38:30,156 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:30,156 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:30,160 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:38:30,164 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:38:30,172 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:38:30,188 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:38:30,189 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:38:30,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:31,611 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:38:31,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:31,613 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:38:31,614 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:31,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:31,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:31,726 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:38:31,726 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [138869094] [2021-05-06 11:38:31,726 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [138869094] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:38:31,726 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:38:31,726 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [64] imperfect sequences [] total 64 [2021-05-06 11:38:31,726 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094649585] [2021-05-06 11:38:31,726 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-06 11:38:31,726 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:38:31,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-06 11:38:31,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1778, Invalid=2254, Unknown=0, NotChecked=0, Total=4032 [2021-05-06 11:38:31,727 INFO L87 Difference]: Start difference. First operand 132 states and 133 transitions. Second operand has 64 states, 64 states have (on average 1.984375) internal successors, (127), 62 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:38,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:38:38,476 INFO L93 Difference]: Finished difference Result 308 states and 365 transitions. [2021-05-06 11:38:38,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2021-05-06 11:38:38,477 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 1.984375) internal successors, (127), 62 states have internal predecessors, (127), 2 states have call successors, (3), 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 131 [2021-05-06 11:38:38,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:38:38,478 INFO L225 Difference]: With dead ends: 308 [2021-05-06 11:38:38,478 INFO L226 Difference]: Without dead ends: 302 [2021-05-06 11:38:38,479 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8721 ImplicationChecksByTransitivity, 6210.6ms TimeCoverageRelationStatistics Valid=10633, Invalid=22309, Unknown=0, NotChecked=0, Total=32942 [2021-05-06 11:38:38,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2021-05-06 11:38:38,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 134. [2021-05-06 11:38:38,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 129 states have (on average 1.0155038759689923) internal successors, (131), 129 states have internal predecessors, (131), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:38,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 135 transitions. [2021-05-06 11:38:38,508 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 135 transitions. Word has length 131 [2021-05-06 11:38:38,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:38:38,508 INFO L480 AbstractCegarLoop]: Abstraction has 134 states and 135 transitions. [2021-05-06 11:38:38,508 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 64 states, 64 states have (on average 1.984375) internal successors, (127), 62 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:38,508 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 135 transitions. [2021-05-06 11:38:38,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-05-06 11:38:38,509 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:38:38,509 INFO L523 BasicCegarLoop]: trace histogram [58, 57, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:38:38,509 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2021-05-06 11:38:38,509 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:38:38,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:38:38,509 INFO L82 PathProgramCache]: Analyzing trace with hash -609346079, now seen corresponding path program 57 times [2021-05-06 11:38:38,509 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:38:38,509 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1182562426] [2021-05-06 11:38:38,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:38:38,513 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:38:38,528 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:38,529 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:38,532 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:38:38,536 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:38:38,545 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:38:38,561 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:38:38,562 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:38:38,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:40,022 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:38:40,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:40,024 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:38:40,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:40,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:40,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:40,138 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:38:40,139 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1182562426] [2021-05-06 11:38:40,139 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1182562426] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:38:40,139 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:38:40,139 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [65] imperfect sequences [] total 65 [2021-05-06 11:38:40,139 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338138042] [2021-05-06 11:38:40,139 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-06 11:38:40,139 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:38:40,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-06 11:38:40,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1838, Invalid=2322, Unknown=0, NotChecked=0, Total=4160 [2021-05-06 11:38:40,140 INFO L87 Difference]: Start difference. First operand 134 states and 135 transitions. Second operand has 65 states, 65 states have (on average 1.9846153846153847) internal successors, (129), 63 states have internal predecessors, (129), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:47,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:38:47,143 INFO L93 Difference]: Finished difference Result 313 states and 371 transitions. [2021-05-06 11:38:47,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2021-05-06 11:38:47,156 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.9846153846153847) internal successors, (129), 63 states have internal predecessors, (129), 2 states have call successors, (3), 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 133 [2021-05-06 11:38:47,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:38:47,156 INFO L225 Difference]: With dead ends: 313 [2021-05-06 11:38:47,157 INFO L226 Difference]: Without dead ends: 307 [2021-05-06 11:38:47,158 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9019 ImplicationChecksByTransitivity, 6363.8ms TimeCoverageRelationStatistics Valid=10993, Invalid=23047, Unknown=0, NotChecked=0, Total=34040 [2021-05-06 11:38:47,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2021-05-06 11:38:47,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 136. [2021-05-06 11:38:47,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 131 states have (on average 1.015267175572519) internal successors, (133), 131 states have internal predecessors, (133), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:47,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2021-05-06 11:38:47,188 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 133 [2021-05-06 11:38:47,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:38:47,188 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2021-05-06 11:38:47,188 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 65 states have (on average 1.9846153846153847) internal successors, (129), 63 states have internal predecessors, (129), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:47,188 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2021-05-06 11:38:47,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-05-06 11:38:47,189 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:38:47,189 INFO L523 BasicCegarLoop]: trace histogram [59, 58, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:38:47,189 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2021-05-06 11:38:47,189 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:38:47,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:38:47,189 INFO L82 PathProgramCache]: Analyzing trace with hash -1824525476, now seen corresponding path program 58 times [2021-05-06 11:38:47,189 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:38:47,189 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [902957686] [2021-05-06 11:38:47,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:38:47,193 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:38:47,208 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:47,208 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:47,212 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:38:47,216 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:38:47,224 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:38:47,240 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:38:47,241 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:38:47,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:48,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:38:48,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:48,685 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:38:48,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:48,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:48,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:48,784 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:38:48,784 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [902957686] [2021-05-06 11:38:48,785 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [902957686] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:38:48,785 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:38:48,785 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [66] imperfect sequences [] total 66 [2021-05-06 11:38:48,785 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082351822] [2021-05-06 11:38:48,785 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-06 11:38:48,785 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:38:48,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-06 11:38:48,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1899, Invalid=2391, Unknown=0, NotChecked=0, Total=4290 [2021-05-06 11:38:48,786 INFO L87 Difference]: Start difference. First operand 136 states and 137 transitions. Second operand has 66 states, 66 states have (on average 1.9848484848484849) internal successors, (131), 64 states have internal predecessors, (131), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:55,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:38:55,968 INFO L93 Difference]: Finished difference Result 318 states and 377 transitions. [2021-05-06 11:38:55,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 125 states. [2021-05-06 11:38:55,969 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 1.9848484848484849) internal successors, (131), 64 states have internal predecessors, (131), 2 states have call successors, (3), 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 135 [2021-05-06 11:38:55,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:38:55,969 INFO L225 Difference]: With dead ends: 318 [2021-05-06 11:38:55,969 INFO L226 Difference]: Without dead ends: 312 [2021-05-06 11:38:55,971 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9322 ImplicationChecksByTransitivity, 6420.9ms TimeCoverageRelationStatistics Valid=11359, Invalid=23797, Unknown=0, NotChecked=0, Total=35156 [2021-05-06 11:38:55,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2021-05-06 11:38:56,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 138. [2021-05-06 11:38:56,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 133 states have (on average 1.0150375939849625) internal successors, (135), 133 states have internal predecessors, (135), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:56,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 139 transitions. [2021-05-06 11:38:56,020 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 139 transitions. Word has length 135 [2021-05-06 11:38:56,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:38:56,020 INFO L480 AbstractCegarLoop]: Abstraction has 138 states and 139 transitions. [2021-05-06 11:38:56,020 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 66 states, 66 states have (on average 1.9848484848484849) internal successors, (131), 64 states have internal predecessors, (131), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:38:56,020 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 139 transitions. [2021-05-06 11:38:56,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-06 11:38:56,021 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:38:56,021 INFO L523 BasicCegarLoop]: trace histogram [60, 59, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:38:56,021 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2021-05-06 11:38:56,021 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:38:56,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:38:56,021 INFO L82 PathProgramCache]: Analyzing trace with hash -1380821481, now seen corresponding path program 59 times [2021-05-06 11:38:56,021 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:38:56,021 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1747651750] [2021-05-06 11:38:56,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:38:56,025 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:38:56,026 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:56,026 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:38:56,030 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:38:56,033 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:38:56,053 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:38:56,069 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:38:56,070 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:38:56,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:57,641 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:38:57,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:38:57,644 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:38:57,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:57,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:57,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:38:57,763 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:38:57,763 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1747651750] [2021-05-06 11:38:57,764 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1747651750] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:38:57,764 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:38:57,764 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [67] imperfect sequences [] total 67 [2021-05-06 11:38:57,764 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [821427638] [2021-05-06 11:38:57,764 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2021-05-06 11:38:57,764 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:38:57,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-05-06 11:38:57,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1961, Invalid=2461, Unknown=0, NotChecked=0, Total=4422 [2021-05-06 11:38:57,765 INFO L87 Difference]: Start difference. First operand 138 states and 139 transitions. Second operand has 67 states, 67 states have (on average 1.9850746268656716) internal successors, (133), 65 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:05,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:39:05,315 INFO L93 Difference]: Finished difference Result 323 states and 383 transitions. [2021-05-06 11:39:05,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2021-05-06 11:39:05,315 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 1.9850746268656716) internal successors, (133), 65 states have internal predecessors, (133), 2 states have call successors, (3), 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 137 [2021-05-06 11:39:05,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:39:05,316 INFO L225 Difference]: With dead ends: 323 [2021-05-06 11:39:05,316 INFO L226 Difference]: Without dead ends: 317 [2021-05-06 11:39:05,317 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9630 ImplicationChecksByTransitivity, 6780.5ms TimeCoverageRelationStatistics Valid=11731, Invalid=24559, Unknown=0, NotChecked=0, Total=36290 [2021-05-06 11:39:05,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2021-05-06 11:39:05,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 140. [2021-05-06 11:39:05,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 135 states have (on average 1.0148148148148148) internal successors, (137), 135 states have internal predecessors, (137), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:05,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 141 transitions. [2021-05-06 11:39:05,349 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 141 transitions. Word has length 137 [2021-05-06 11:39:05,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:39:05,349 INFO L480 AbstractCegarLoop]: Abstraction has 140 states and 141 transitions. [2021-05-06 11:39:05,349 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 67 states, 67 states have (on average 1.9850746268656716) internal successors, (133), 65 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:05,350 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 141 transitions. [2021-05-06 11:39:05,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-05-06 11:39:05,350 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:39:05,350 INFO L523 BasicCegarLoop]: trace histogram [61, 60, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:39:05,350 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2021-05-06 11:39:05,350 INFO L428 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:39:05,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:39:05,350 INFO L82 PathProgramCache]: Analyzing trace with hash -183044590, now seen corresponding path program 60 times [2021-05-06 11:39:05,350 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:39:05,351 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1844241284] [2021-05-06 11:39:05,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:39:05,354 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:39:05,369 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:05,370 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:05,373 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:39:05,377 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:39:05,386 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:39:05,402 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:39:05,403 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:39:05,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:39:06,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:39:06,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:39:06,985 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:39:06,986 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:39:06,986 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:39:07,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:39:07,102 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:39:07,103 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1844241284] [2021-05-06 11:39:07,103 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1844241284] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:39:07,103 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:39:07,103 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [68] imperfect sequences [] total 68 [2021-05-06 11:39:07,103 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483419560] [2021-05-06 11:39:07,103 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2021-05-06 11:39:07,103 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:39:07,104 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-05-06 11:39:07,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2024, Invalid=2532, Unknown=0, NotChecked=0, Total=4556 [2021-05-06 11:39:07,104 INFO L87 Difference]: Start difference. First operand 140 states and 141 transitions. Second operand has 68 states, 68 states have (on average 1.9852941176470589) internal successors, (135), 66 states have internal predecessors, (135), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:14,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:39:14,561 INFO L93 Difference]: Finished difference Result 328 states and 389 transitions. [2021-05-06 11:39:14,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 129 states. [2021-05-06 11:39:14,561 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 1.9852941176470589) internal successors, (135), 66 states have internal predecessors, (135), 2 states have call successors, (3), 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 139 [2021-05-06 11:39:14,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:39:14,564 INFO L225 Difference]: With dead ends: 328 [2021-05-06 11:39:14,564 INFO L226 Difference]: Without dead ends: 322 [2021-05-06 11:39:14,565 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9943 ImplicationChecksByTransitivity, 6754.6ms TimeCoverageRelationStatistics Valid=12109, Invalid=25333, Unknown=0, NotChecked=0, Total=37442 [2021-05-06 11:39:14,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2021-05-06 11:39:14,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 142. [2021-05-06 11:39:14,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 137 states have (on average 1.0145985401459854) internal successors, (139), 137 states have internal predecessors, (139), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:14,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 143 transitions. [2021-05-06 11:39:14,597 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 143 transitions. Word has length 139 [2021-05-06 11:39:14,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:39:14,597 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 143 transitions. [2021-05-06 11:39:14,597 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 68 states, 68 states have (on average 1.9852941176470589) internal successors, (135), 66 states have internal predecessors, (135), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:14,597 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 143 transitions. [2021-05-06 11:39:14,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-05-06 11:39:14,598 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:39:14,598 INFO L523 BasicCegarLoop]: trace histogram [62, 61, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:39:14,598 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2021-05-06 11:39:14,599 INFO L428 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:39:14,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:39:14,599 INFO L82 PathProgramCache]: Analyzing trace with hash -170687667, now seen corresponding path program 61 times [2021-05-06 11:39:14,599 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:39:14,599 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [435326852] [2021-05-06 11:39:14,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:39:14,621 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:39:14,643 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:14,643 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:14,647 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:39:14,650 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:39:14,659 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:39:14,674 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:39:14,675 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:39:14,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:39:16,241 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:39:16,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:39:16,246 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:39:16,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:39:16,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:39:16,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:39:16,365 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:39:16,365 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [435326852] [2021-05-06 11:39:16,366 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [435326852] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:39:16,366 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:39:16,366 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [69] imperfect sequences [] total 69 [2021-05-06 11:39:16,366 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732997665] [2021-05-06 11:39:16,366 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2021-05-06 11:39:16,366 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:39:16,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-05-06 11:39:16,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2088, Invalid=2604, Unknown=0, NotChecked=0, Total=4692 [2021-05-06 11:39:16,367 INFO L87 Difference]: Start difference. First operand 142 states and 143 transitions. Second operand has 69 states, 69 states have (on average 1.9855072463768115) internal successors, (137), 67 states have internal predecessors, (137), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:24,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:39:24,133 INFO L93 Difference]: Finished difference Result 333 states and 395 transitions. [2021-05-06 11:39:24,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 131 states. [2021-05-06 11:39:24,135 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 1.9855072463768115) internal successors, (137), 67 states have internal predecessors, (137), 2 states have call successors, (3), 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 141 [2021-05-06 11:39:24,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:39:24,136 INFO L225 Difference]: With dead ends: 333 [2021-05-06 11:39:24,136 INFO L226 Difference]: Without dead ends: 327 [2021-05-06 11:39:24,137 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10261 ImplicationChecksByTransitivity, 6833.7ms TimeCoverageRelationStatistics Valid=12493, Invalid=26119, Unknown=0, NotChecked=0, Total=38612 [2021-05-06 11:39:24,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2021-05-06 11:39:24,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 144. [2021-05-06 11:39:24,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 139 states have (on average 1.014388489208633) internal successors, (141), 139 states have internal predecessors, (141), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:24,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 145 transitions. [2021-05-06 11:39:24,173 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 145 transitions. Word has length 141 [2021-05-06 11:39:24,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:39:24,173 INFO L480 AbstractCegarLoop]: Abstraction has 144 states and 145 transitions. [2021-05-06 11:39:24,173 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 69 states, 69 states have (on average 1.9855072463768115) internal successors, (137), 67 states have internal predecessors, (137), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:24,173 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 145 transitions. [2021-05-06 11:39:24,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-05-06 11:39:24,174 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:39:24,174 INFO L523 BasicCegarLoop]: trace histogram [63, 62, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:39:24,174 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63 [2021-05-06 11:39:24,174 INFO L428 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:39:24,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:39:24,174 INFO L82 PathProgramCache]: Analyzing trace with hash -1180586552, now seen corresponding path program 62 times [2021-05-06 11:39:24,174 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:39:24,174 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1678802620] [2021-05-06 11:39:24,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:39:24,182 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:39:24,183 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:24,183 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:24,203 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:39:24,208 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:39:24,232 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:39:24,251 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:39:24,253 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:39:24,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:39:25,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:39:25,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:39:25,875 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:39:25,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:39:25,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:39:25,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:39:25,968 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:39:25,968 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1678802620] [2021-05-06 11:39:25,968 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1678802620] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:39:25,968 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:39:25,968 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [70] imperfect sequences [] total 70 [2021-05-06 11:39:25,969 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049933146] [2021-05-06 11:39:25,969 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2021-05-06 11:39:25,969 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:39:25,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-05-06 11:39:25,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2153, Invalid=2677, Unknown=0, NotChecked=0, Total=4830 [2021-05-06 11:39:25,970 INFO L87 Difference]: Start difference. First operand 144 states and 145 transitions. Second operand has 70 states, 70 states have (on average 1.9857142857142858) internal successors, (139), 68 states have internal predecessors, (139), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:34,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:39:34,191 INFO L93 Difference]: Finished difference Result 338 states and 401 transitions. [2021-05-06 11:39:34,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2021-05-06 11:39:34,192 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 1.9857142857142858) internal successors, (139), 68 states have internal predecessors, (139), 2 states have call successors, (3), 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 143 [2021-05-06 11:39:34,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:39:34,193 INFO L225 Difference]: With dead ends: 338 [2021-05-06 11:39:34,193 INFO L226 Difference]: Without dead ends: 332 [2021-05-06 11:39:34,194 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10584 ImplicationChecksByTransitivity, 7224.0ms TimeCoverageRelationStatistics Valid=12883, Invalid=26917, Unknown=0, NotChecked=0, Total=39800 [2021-05-06 11:39:34,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 332 states. [2021-05-06 11:39:34,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 332 to 146. [2021-05-06 11:39:34,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 141 states have (on average 1.0141843971631206) internal successors, (143), 141 states have internal predecessors, (143), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:34,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 147 transitions. [2021-05-06 11:39:34,242 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 147 transitions. Word has length 143 [2021-05-06 11:39:34,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:39:34,242 INFO L480 AbstractCegarLoop]: Abstraction has 146 states and 147 transitions. [2021-05-06 11:39:34,242 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 70 states, 70 states have (on average 1.9857142857142858) internal successors, (139), 68 states have internal predecessors, (139), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:34,242 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 147 transitions. [2021-05-06 11:39:34,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-05-06 11:39:34,243 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:39:34,243 INFO L523 BasicCegarLoop]: trace histogram [64, 63, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:39:34,243 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64 [2021-05-06 11:39:34,244 INFO L428 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:39:34,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:39:34,245 INFO L82 PathProgramCache]: Analyzing trace with hash -1030806141, now seen corresponding path program 63 times [2021-05-06 11:39:34,245 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:39:34,245 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1268541686] [2021-05-06 11:39:34,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:39:34,257 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:39:34,272 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:34,273 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:34,278 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:39:34,284 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:39:34,293 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:39:34,309 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:39:34,310 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:39:34,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:39:36,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:39:36,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:39:36,104 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:39:36,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:39:36,106 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:39:36,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:39:36,228 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:39:36,229 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1268541686] [2021-05-06 11:39:36,229 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1268541686] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:39:36,229 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:39:36,229 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [71] imperfect sequences [] total 71 [2021-05-06 11:39:36,229 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058255660] [2021-05-06 11:39:36,229 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2021-05-06 11:39:36,229 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:39:36,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-05-06 11:39:36,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2219, Invalid=2751, Unknown=0, NotChecked=0, Total=4970 [2021-05-06 11:39:36,230 INFO L87 Difference]: Start difference. First operand 146 states and 147 transitions. Second operand has 71 states, 71 states have (on average 1.9859154929577465) internal successors, (141), 69 states have internal predecessors, (141), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:44,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:39:44,588 INFO L93 Difference]: Finished difference Result 343 states and 407 transitions. [2021-05-06 11:39:44,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 135 states. [2021-05-06 11:39:44,589 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 1.9859154929577465) internal successors, (141), 69 states have internal predecessors, (141), 2 states have call successors, (3), 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 145 [2021-05-06 11:39:44,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:39:44,590 INFO L225 Difference]: With dead ends: 343 [2021-05-06 11:39:44,590 INFO L226 Difference]: Without dead ends: 337 [2021-05-06 11:39:44,591 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 201 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10912 ImplicationChecksByTransitivity, 7450.1ms TimeCoverageRelationStatistics Valid=13279, Invalid=27727, Unknown=0, NotChecked=0, Total=41006 [2021-05-06 11:39:44,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2021-05-06 11:39:44,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 148. [2021-05-06 11:39:44,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 143 states have (on average 1.013986013986014) internal successors, (145), 143 states have internal predecessors, (145), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:44,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 149 transitions. [2021-05-06 11:39:44,643 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 149 transitions. Word has length 145 [2021-05-06 11:39:44,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:39:44,643 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 149 transitions. [2021-05-06 11:39:44,643 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 71 states, 71 states have (on average 1.9859154929577465) internal successors, (141), 69 states have internal predecessors, (141), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:44,643 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 149 transitions. [2021-05-06 11:39:44,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-05-06 11:39:44,644 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:39:44,644 INFO L523 BasicCegarLoop]: trace histogram [65, 64, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:39:44,644 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2021-05-06 11:39:44,644 INFO L428 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:39:44,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:39:44,644 INFO L82 PathProgramCache]: Analyzing trace with hash 1174248062, now seen corresponding path program 64 times [2021-05-06 11:39:44,644 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:39:44,644 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [200136308] [2021-05-06 11:39:44,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:39:44,650 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:39:44,665 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:44,665 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:44,669 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:39:44,672 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:39:44,681 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:39:44,707 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:39:44,708 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:39:44,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:39:46,159 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:39:46,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:39:46,161 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:39:46,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:39:46,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:39:46,190 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:39:46,272 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:39:46,272 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [200136308] [2021-05-06 11:39:46,272 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [200136308] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:39:46,272 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:39:46,272 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [72] imperfect sequences [] total 72 [2021-05-06 11:39:46,272 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607293085] [2021-05-06 11:39:46,272 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2021-05-06 11:39:46,272 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:39:46,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-05-06 11:39:46,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2286, Invalid=2826, Unknown=0, NotChecked=0, Total=5112 [2021-05-06 11:39:46,273 INFO L87 Difference]: Start difference. First operand 148 states and 149 transitions. Second operand has 72 states, 72 states have (on average 1.9861111111111112) internal successors, (143), 70 states have internal predecessors, (143), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:55,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:39:55,002 INFO L93 Difference]: Finished difference Result 348 states and 413 transitions. [2021-05-06 11:39:55,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2021-05-06 11:39:55,003 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 1.9861111111111112) internal successors, (143), 70 states have internal predecessors, (143), 2 states have call successors, (3), 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 147 [2021-05-06 11:39:55,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:39:55,003 INFO L225 Difference]: With dead ends: 348 [2021-05-06 11:39:55,004 INFO L226 Difference]: Without dead ends: 342 [2021-05-06 11:39:55,005 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11245 ImplicationChecksByTransitivity, 7365.1ms TimeCoverageRelationStatistics Valid=13681, Invalid=28549, Unknown=0, NotChecked=0, Total=42230 [2021-05-06 11:39:55,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2021-05-06 11:39:55,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 150. [2021-05-06 11:39:55,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 145 states have (on average 1.013793103448276) internal successors, (147), 145 states have internal predecessors, (147), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:55,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 151 transitions. [2021-05-06 11:39:55,041 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 151 transitions. Word has length 147 [2021-05-06 11:39:55,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:39:55,041 INFO L480 AbstractCegarLoop]: Abstraction has 150 states and 151 transitions. [2021-05-06 11:39:55,041 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 72 states, 72 states have (on average 1.9861111111111112) internal successors, (143), 70 states have internal predecessors, (143), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:39:55,041 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 151 transitions. [2021-05-06 11:39:55,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-05-06 11:39:55,042 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:39:55,042 INFO L523 BasicCegarLoop]: trace histogram [66, 65, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:39:55,042 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66 [2021-05-06 11:39:55,042 INFO L428 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:39:55,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:39:55,042 INFO L82 PathProgramCache]: Analyzing trace with hash -1482507079, now seen corresponding path program 65 times [2021-05-06 11:39:55,042 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:39:55,042 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [336803009] [2021-05-06 11:39:55,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:39:55,046 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:39:55,047 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:55,047 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:39:55,051 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:39:55,054 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:39:55,074 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:39:55,090 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:39:55,091 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:39:55,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:39:56,958 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:39:56,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:39:56,961 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:39:56,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:39:56,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:39:56,996 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:39:57,085 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:39:57,085 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [336803009] [2021-05-06 11:39:57,085 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [336803009] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:39:57,085 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:39:57,085 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [73] imperfect sequences [] total 73 [2021-05-06 11:39:57,085 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [970627961] [2021-05-06 11:39:57,086 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2021-05-06 11:39:57,086 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:39:57,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-05-06 11:39:57,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2354, Invalid=2902, Unknown=0, NotChecked=0, Total=5256 [2021-05-06 11:39:57,087 INFO L87 Difference]: Start difference. First operand 150 states and 151 transitions. Second operand has 73 states, 73 states have (on average 1.9863013698630136) internal successors, (145), 71 states have internal predecessors, (145), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:40:06,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:40:06,083 INFO L93 Difference]: Finished difference Result 353 states and 419 transitions. [2021-05-06 11:40:06,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2021-05-06 11:40:06,083 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 1.9863013698630136) internal successors, (145), 71 states have internal predecessors, (145), 2 states have call successors, (3), 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 149 [2021-05-06 11:40:06,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:40:06,084 INFO L225 Difference]: With dead ends: 353 [2021-05-06 11:40:06,084 INFO L226 Difference]: Without dead ends: 347 [2021-05-06 11:40:06,086 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11583 ImplicationChecksByTransitivity, 7981.0ms TimeCoverageRelationStatistics Valid=14089, Invalid=29383, Unknown=0, NotChecked=0, Total=43472 [2021-05-06 11:40:06,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 347 states. [2021-05-06 11:40:06,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 347 to 152. [2021-05-06 11:40:06,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 147 states have (on average 1.0136054421768708) internal successors, (149), 147 states have internal predecessors, (149), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:40:06,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 153 transitions. [2021-05-06 11:40:06,123 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 153 transitions. Word has length 149 [2021-05-06 11:40:06,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:40:06,123 INFO L480 AbstractCegarLoop]: Abstraction has 152 states and 153 transitions. [2021-05-06 11:40:06,123 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 73 states, 73 states have (on average 1.9863013698630136) internal successors, (145), 71 states have internal predecessors, (145), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:40:06,123 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 153 transitions. [2021-05-06 11:40:06,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-05-06 11:40:06,124 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:40:06,124 INFO L523 BasicCegarLoop]: trace histogram [67, 66, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:40:06,124 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67 [2021-05-06 11:40:06,124 INFO L428 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:40:06,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:40:06,124 INFO L82 PathProgramCache]: Analyzing trace with hash 881343540, now seen corresponding path program 66 times [2021-05-06 11:40:06,124 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:40:06,124 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [89024366] [2021-05-06 11:40:06,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:40:06,128 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:40:06,143 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:40:06,144 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:40:06,148 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:40:06,151 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:40:06,160 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:40:06,176 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:40:06,177 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:40:06,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:40:08,106 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:40:08,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:40:08,108 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:40:08,109 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:40:08,110 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:40:08,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:40:08,236 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:40:08,236 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [89024366] [2021-05-06 11:40:08,236 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [89024366] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:40:08,236 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:40:08,237 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [74] imperfect sequences [] total 74 [2021-05-06 11:40:08,237 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [987170273] [2021-05-06 11:40:08,237 INFO L460 AbstractCegarLoop]: Interpolant automaton has 74 states [2021-05-06 11:40:08,237 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:40:08,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-05-06 11:40:08,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2423, Invalid=2979, Unknown=0, NotChecked=0, Total=5402 [2021-05-06 11:40:08,238 INFO L87 Difference]: Start difference. First operand 152 states and 153 transitions. Second operand has 74 states, 74 states have (on average 1.9864864864864864) internal successors, (147), 72 states have internal predecessors, (147), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:40:17,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:40:17,581 INFO L93 Difference]: Finished difference Result 358 states and 425 transitions. [2021-05-06 11:40:17,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 141 states. [2021-05-06 11:40:17,581 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 1.9864864864864864) internal successors, (147), 72 states have internal predecessors, (147), 2 states have call successors, (3), 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 151 [2021-05-06 11:40:17,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:40:17,582 INFO L225 Difference]: With dead ends: 358 [2021-05-06 11:40:17,582 INFO L226 Difference]: Without dead ends: 352 [2021-05-06 11:40:17,583 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 210 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11926 ImplicationChecksByTransitivity, 8183.4ms TimeCoverageRelationStatistics Valid=14503, Invalid=30229, Unknown=0, NotChecked=0, Total=44732 [2021-05-06 11:40:17,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2021-05-06 11:40:17,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 154. [2021-05-06 11:40:17,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 149 states have (on average 1.0134228187919463) internal successors, (151), 149 states have internal predecessors, (151), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:40:17,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 155 transitions. [2021-05-06 11:40:17,621 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 155 transitions. Word has length 151 [2021-05-06 11:40:17,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:40:17,621 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 155 transitions. [2021-05-06 11:40:17,621 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 74 states, 74 states have (on average 1.9864864864864864) internal successors, (147), 72 states have internal predecessors, (147), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:40:17,622 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 155 transitions. [2021-05-06 11:40:17,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2021-05-06 11:40:17,622 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:40:17,622 INFO L523 BasicCegarLoop]: trace histogram [68, 67, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:40:17,622 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68 [2021-05-06 11:40:17,622 INFO L428 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:40:17,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:40:17,622 INFO L82 PathProgramCache]: Analyzing trace with hash 504088815, now seen corresponding path program 67 times [2021-05-06 11:40:17,622 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:40:17,623 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [648756999] [2021-05-06 11:40:17,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:40:17,626 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:40:17,627 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:40:17,627 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:40:17,631 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:40:17,635 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:40:17,655 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:40:17,670 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:40:17,671 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:40:17,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:40:19,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:40:19,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:40:19,658 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:40:19,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:40:19,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:40:19,694 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:40:19,787 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:40:19,787 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [648756999] [2021-05-06 11:40:19,787 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [648756999] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:40:19,787 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:40:19,787 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [75] imperfect sequences [] total 75 [2021-05-06 11:40:19,787 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830114815] [2021-05-06 11:40:19,788 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2021-05-06 11:40:19,788 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:40:19,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-05-06 11:40:19,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2493, Invalid=3057, Unknown=0, NotChecked=0, Total=5550 [2021-05-06 11:40:19,789 INFO L87 Difference]: Start difference. First operand 154 states and 155 transitions. Second operand has 75 states, 75 states have (on average 1.9866666666666666) internal successors, (149), 73 states have internal predecessors, (149), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:40:29,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:40:29,532 INFO L93 Difference]: Finished difference Result 363 states and 431 transitions. [2021-05-06 11:40:29,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 143 states. [2021-05-06 11:40:29,532 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 1.9866666666666666) internal successors, (149), 73 states have internal predecessors, (149), 2 states have call successors, (3), 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 153 [2021-05-06 11:40:29,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:40:29,533 INFO L225 Difference]: With dead ends: 363 [2021-05-06 11:40:29,533 INFO L226 Difference]: Without dead ends: 357 [2021-05-06 11:40:29,535 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 213 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12274 ImplicationChecksByTransitivity, 8485.1ms TimeCoverageRelationStatistics Valid=14923, Invalid=31087, Unknown=0, NotChecked=0, Total=46010 [2021-05-06 11:40:29,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 357 states. [2021-05-06 11:40:29,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 357 to 156. [2021-05-06 11:40:29,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 151 states have (on average 1.0132450331125828) internal successors, (153), 151 states have internal predecessors, (153), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:40:29,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 157 transitions. [2021-05-06 11:40:29,573 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 157 transitions. Word has length 153 [2021-05-06 11:40:29,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:40:29,574 INFO L480 AbstractCegarLoop]: Abstraction has 156 states and 157 transitions. [2021-05-06 11:40:29,574 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 75 states, 75 states have (on average 1.9866666666666666) internal successors, (149), 73 states have internal predecessors, (149), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:40:29,574 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 157 transitions. [2021-05-06 11:40:29,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-05-06 11:40:29,574 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:40:29,574 INFO L523 BasicCegarLoop]: trace histogram [69, 68, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:40:29,574 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69 [2021-05-06 11:40:29,574 INFO L428 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:40:29,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:40:29,575 INFO L82 PathProgramCache]: Analyzing trace with hash -1260449046, now seen corresponding path program 68 times [2021-05-06 11:40:29,575 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:40:29,575 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [157158501] [2021-05-06 11:40:29,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:40:29,578 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:40:29,579 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:40:29,580 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:40:29,583 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:40:29,587 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:40:29,608 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:40:29,623 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:40:29,624 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:40:29,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:40:31,663 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:40:31,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:40:31,666 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:40:31,667 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:40:31,667 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:40:31,703 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:40:31,796 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:40:31,796 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [157158501] [2021-05-06 11:40:31,796 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [157158501] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:40:31,796 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:40:31,796 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [76] imperfect sequences [] total 76 [2021-05-06 11:40:31,796 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1341923184] [2021-05-06 11:40:31,797 INFO L460 AbstractCegarLoop]: Interpolant automaton has 76 states [2021-05-06 11:40:31,797 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:40:31,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-05-06 11:40:31,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2564, Invalid=3136, Unknown=0, NotChecked=0, Total=5700 [2021-05-06 11:40:31,797 INFO L87 Difference]: Start difference. First operand 156 states and 157 transitions. Second operand has 76 states, 76 states have (on average 1.986842105263158) internal successors, (151), 74 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:40:41,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:40:41,539 INFO L93 Difference]: Finished difference Result 368 states and 437 transitions. [2021-05-06 11:40:41,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 145 states. [2021-05-06 11:40:41,539 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 1.986842105263158) internal successors, (151), 74 states have internal predecessors, (151), 2 states have call successors, (3), 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 155 [2021-05-06 11:40:41,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:40:41,540 INFO L225 Difference]: With dead ends: 368 [2021-05-06 11:40:41,540 INFO L226 Difference]: Without dead ends: 362 [2021-05-06 11:40:41,542 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12627 ImplicationChecksByTransitivity, 8571.5ms TimeCoverageRelationStatistics Valid=15349, Invalid=31957, Unknown=0, NotChecked=0, Total=47306 [2021-05-06 11:40:41,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 362 states. [2021-05-06 11:40:41,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 362 to 158. [2021-05-06 11:40:41,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 153 states have (on average 1.0130718954248366) internal successors, (155), 153 states have internal predecessors, (155), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:40:41,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 159 transitions. [2021-05-06 11:40:41,581 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 159 transitions. Word has length 155 [2021-05-06 11:40:41,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:40:41,581 INFO L480 AbstractCegarLoop]: Abstraction has 158 states and 159 transitions. [2021-05-06 11:40:41,581 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 76 states, 76 states have (on average 1.986842105263158) internal successors, (151), 74 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:40:41,581 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 159 transitions. [2021-05-06 11:40:41,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-05-06 11:40:41,582 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:40:41,582 INFO L523 BasicCegarLoop]: trace histogram [70, 69, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:40:41,582 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70 [2021-05-06 11:40:41,582 INFO L428 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:40:41,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:40:41,582 INFO L82 PathProgramCache]: Analyzing trace with hash -469251547, now seen corresponding path program 69 times [2021-05-06 11:40:41,582 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:40:41,582 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [761060631] [2021-05-06 11:40:41,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:40:41,586 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:40:41,586 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:40:41,587 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:40:41,590 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:40:41,594 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:40:41,614 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:40:41,629 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:40:41,630 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:40:41,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:40:43,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:40:43,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:40:43,722 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:40:43,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:40:43,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:40:43,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:40:43,853 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:40:43,853 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [761060631] [2021-05-06 11:40:43,853 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [761060631] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:40:43,853 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:40:43,853 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [77] imperfect sequences [] total 77 [2021-05-06 11:40:43,853 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1055869366] [2021-05-06 11:40:43,854 INFO L460 AbstractCegarLoop]: Interpolant automaton has 77 states [2021-05-06 11:40:43,854 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:40:43,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-05-06 11:40:43,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2636, Invalid=3216, Unknown=0, NotChecked=0, Total=5852 [2021-05-06 11:40:43,854 INFO L87 Difference]: Start difference. First operand 158 states and 159 transitions. Second operand has 77 states, 77 states have (on average 1.9870129870129871) internal successors, (153), 75 states have internal predecessors, (153), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:40:53,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:40:53,990 INFO L93 Difference]: Finished difference Result 373 states and 443 transitions. [2021-05-06 11:40:53,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 147 states. [2021-05-06 11:40:53,991 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 1.9870129870129871) internal successors, (153), 75 states have internal predecessors, (153), 2 states have call successors, (3), 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 157 [2021-05-06 11:40:53,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:40:53,992 INFO L225 Difference]: With dead ends: 373 [2021-05-06 11:40:53,992 INFO L226 Difference]: Without dead ends: 367 [2021-05-06 11:40:53,994 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 219 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12985 ImplicationChecksByTransitivity, 8795.7ms TimeCoverageRelationStatistics Valid=15781, Invalid=32839, Unknown=0, NotChecked=0, Total=48620 [2021-05-06 11:40:53,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2021-05-06 11:40:54,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 160. [2021-05-06 11:40:54,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 155 states have (on average 1.0129032258064516) internal successors, (157), 155 states have internal predecessors, (157), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:40:54,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 161 transitions. [2021-05-06 11:40:54,035 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 161 transitions. Word has length 157 [2021-05-06 11:40:54,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:40:54,035 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 161 transitions. [2021-05-06 11:40:54,035 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 77 states, 77 states have (on average 1.9870129870129871) internal successors, (153), 75 states have internal predecessors, (153), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:40:54,035 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 161 transitions. [2021-05-06 11:40:54,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-05-06 11:40:54,035 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:40:54,036 INFO L523 BasicCegarLoop]: trace histogram [71, 70, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:40:54,036 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71 [2021-05-06 11:40:54,036 INFO L428 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:40:54,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:40:54,036 INFO L82 PathProgramCache]: Analyzing trace with hash -337666400, now seen corresponding path program 70 times [2021-05-06 11:40:54,036 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:40:54,036 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1121004105] [2021-05-06 11:40:54,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:40:54,040 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:40:54,055 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:40:54,055 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:40:54,059 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:40:54,062 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:40:54,071 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:40:54,088 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:40:54,089 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:40:54,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:40:56,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:40:56,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:40:56,237 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:40:56,238 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:40:56,238 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:40:56,275 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:40:56,369 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:40:56,370 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1121004105] [2021-05-06 11:40:56,370 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1121004105] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:40:56,370 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:40:56,370 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [78] imperfect sequences [] total 78 [2021-05-06 11:40:56,370 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390166250] [2021-05-06 11:40:56,370 INFO L460 AbstractCegarLoop]: Interpolant automaton has 78 states [2021-05-06 11:40:56,370 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:40:56,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-05-06 11:40:56,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2709, Invalid=3297, Unknown=0, NotChecked=0, Total=6006 [2021-05-06 11:40:56,371 INFO L87 Difference]: Start difference. First operand 160 states and 161 transitions. Second operand has 78 states, 78 states have (on average 1.9871794871794872) internal successors, (155), 76 states have internal predecessors, (155), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:41:06,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:41:06,903 INFO L93 Difference]: Finished difference Result 378 states and 449 transitions. [2021-05-06 11:41:06,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 149 states. [2021-05-06 11:41:06,903 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 78 states have (on average 1.9871794871794872) internal successors, (155), 76 states have internal predecessors, (155), 2 states have call successors, (3), 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 159 [2021-05-06 11:41:06,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:41:06,904 INFO L225 Difference]: With dead ends: 378 [2021-05-06 11:41:06,904 INFO L226 Difference]: Without dead ends: 372 [2021-05-06 11:41:06,906 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 299 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 222 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13348 ImplicationChecksByTransitivity, 9093.4ms TimeCoverageRelationStatistics Valid=16219, Invalid=33733, Unknown=0, NotChecked=0, Total=49952 [2021-05-06 11:41:06,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 372 states. [2021-05-06 11:41:06,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 372 to 162. [2021-05-06 11:41:06,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 157 states have (on average 1.0127388535031847) internal successors, (159), 157 states have internal predecessors, (159), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:41:06,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 163 transitions. [2021-05-06 11:41:06,948 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 163 transitions. Word has length 159 [2021-05-06 11:41:06,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:41:06,948 INFO L480 AbstractCegarLoop]: Abstraction has 162 states and 163 transitions. [2021-05-06 11:41:06,948 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 78 states, 78 states have (on average 1.9871794871794872) internal successors, (155), 76 states have internal predecessors, (155), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:41:06,949 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 163 transitions. [2021-05-06 11:41:06,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-05-06 11:41:06,949 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:41:06,949 INFO L523 BasicCegarLoop]: trace histogram [72, 71, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:41:06,949 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72 [2021-05-06 11:41:06,949 INFO L428 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:41:06,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:41:06,950 INFO L82 PathProgramCache]: Analyzing trace with hash 1561608283, now seen corresponding path program 71 times [2021-05-06 11:41:06,950 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:41:06,950 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2040661887] [2021-05-06 11:41:06,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:41:06,953 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:41:06,954 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:41:06,954 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:41:06,958 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:41:06,962 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:41:06,982 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:41:06,997 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:41:06,998 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:41:07,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:41:08,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:41:08,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:41:08,793 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:41:08,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:41:08,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:41:08,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:41:08,918 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:41:08,918 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2040661887] [2021-05-06 11:41:08,918 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2040661887] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:41:08,918 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:41:08,918 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [79] imperfect sequences [] total 79 [2021-05-06 11:41:08,918 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476469030] [2021-05-06 11:41:08,919 INFO L460 AbstractCegarLoop]: Interpolant automaton has 79 states [2021-05-06 11:41:08,919 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:41:08,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-05-06 11:41:08,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2783, Invalid=3379, Unknown=0, NotChecked=0, Total=6162 [2021-05-06 11:41:08,920 INFO L87 Difference]: Start difference. First operand 162 states and 163 transitions. Second operand has 79 states, 79 states have (on average 1.9873417721518987) internal successors, (157), 77 states have internal predecessors, (157), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:41:19,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:41:19,774 INFO L93 Difference]: Finished difference Result 383 states and 455 transitions. [2021-05-06 11:41:19,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 151 states. [2021-05-06 11:41:19,774 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 1.9873417721518987) internal successors, (157), 77 states have internal predecessors, (157), 2 states have call successors, (3), 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 161 [2021-05-06 11:41:19,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:41:19,775 INFO L225 Difference]: With dead ends: 383 [2021-05-06 11:41:19,775 INFO L226 Difference]: Without dead ends: 377 [2021-05-06 11:41:19,777 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 225 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13716 ImplicationChecksByTransitivity, 8863.4ms TimeCoverageRelationStatistics Valid=16663, Invalid=34639, Unknown=0, NotChecked=0, Total=51302 [2021-05-06 11:41:19,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2021-05-06 11:41:19,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 164. [2021-05-06 11:41:19,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 159 states have (on average 1.0125786163522013) internal successors, (161), 159 states have internal predecessors, (161), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:41:19,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 165 transitions. [2021-05-06 11:41:19,820 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 165 transitions. Word has length 161 [2021-05-06 11:41:19,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:41:19,821 INFO L480 AbstractCegarLoop]: Abstraction has 164 states and 165 transitions. [2021-05-06 11:41:19,821 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 79 states, 79 states have (on average 1.9873417721518987) internal successors, (157), 77 states have internal predecessors, (157), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:41:19,821 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 165 transitions. [2021-05-06 11:41:19,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2021-05-06 11:41:19,821 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:41:19,821 INFO L523 BasicCegarLoop]: trace histogram [73, 72, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:41:19,822 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73 [2021-05-06 11:41:19,822 INFO L428 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:41:19,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:41:19,822 INFO L82 PathProgramCache]: Analyzing trace with hash 1403477846, now seen corresponding path program 72 times [2021-05-06 11:41:19,822 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:41:19,822 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [101663582] [2021-05-06 11:41:19,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:41:19,826 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:41:19,841 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:41:19,841 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:41:19,845 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:41:19,849 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:41:19,858 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:41:19,873 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:41:19,874 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:41:19,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:41:22,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:41:22,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:41:22,122 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:41:22,123 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:41:22,123 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:41:22,168 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:41:22,267 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:41:22,267 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [101663582] [2021-05-06 11:41:22,267 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [101663582] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:41:22,267 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:41:22,267 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [80] imperfect sequences [] total 80 [2021-05-06 11:41:22,267 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643259190] [2021-05-06 11:41:22,267 INFO L460 AbstractCegarLoop]: Interpolant automaton has 80 states [2021-05-06 11:41:22,268 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:41:22,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-05-06 11:41:22,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2858, Invalid=3462, Unknown=0, NotChecked=0, Total=6320 [2021-05-06 11:41:22,268 INFO L87 Difference]: Start difference. First operand 164 states and 165 transitions. Second operand has 80 states, 80 states have (on average 1.9875) internal successors, (159), 78 states have internal predecessors, (159), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:41:33,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:41:33,451 INFO L93 Difference]: Finished difference Result 388 states and 461 transitions. [2021-05-06 11:41:33,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 153 states. [2021-05-06 11:41:33,452 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 1.9875) internal successors, (159), 78 states have internal predecessors, (159), 2 states have call successors, (3), 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 163 [2021-05-06 11:41:33,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:41:33,453 INFO L225 Difference]: With dead ends: 388 [2021-05-06 11:41:33,453 INFO L226 Difference]: Without dead ends: 382 [2021-05-06 11:41:33,454 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 228 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14089 ImplicationChecksByTransitivity, 9491.3ms TimeCoverageRelationStatistics Valid=17113, Invalid=35557, Unknown=0, NotChecked=0, Total=52670 [2021-05-06 11:41:33,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 382 states. [2021-05-06 11:41:33,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 382 to 166. [2021-05-06 11:41:33,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 161 states have (on average 1.0124223602484472) internal successors, (163), 161 states have internal predecessors, (163), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:41:33,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 167 transitions. [2021-05-06 11:41:33,499 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 167 transitions. Word has length 163 [2021-05-06 11:41:33,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:41:33,499 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 167 transitions. [2021-05-06 11:41:33,499 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 80 states, 80 states have (on average 1.9875) internal successors, (159), 78 states have internal predecessors, (159), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:41:33,499 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 167 transitions. [2021-05-06 11:41:33,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2021-05-06 11:41:33,500 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:41:33,500 INFO L523 BasicCegarLoop]: trace histogram [74, 73, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:41:33,500 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74 [2021-05-06 11:41:33,500 INFO L428 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:41:33,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:41:33,500 INFO L82 PathProgramCache]: Analyzing trace with hash -236016751, now seen corresponding path program 73 times [2021-05-06 11:41:33,500 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:41:33,500 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [683856054] [2021-05-06 11:41:33,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:41:33,504 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:41:33,505 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:41:33,505 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:41:33,509 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:41:33,512 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:41:33,533 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:41:33,548 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:41:33,549 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:41:33,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:41:35,865 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:41:35,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:41:35,868 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:41:35,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:41:35,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:41:35,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:41:36,006 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:41:36,006 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [683856054] [2021-05-06 11:41:36,006 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [683856054] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:41:36,006 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:41:36,006 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [81] imperfect sequences [] total 81 [2021-05-06 11:41:36,006 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1829075924] [2021-05-06 11:41:36,006 INFO L460 AbstractCegarLoop]: Interpolant automaton has 81 states [2021-05-06 11:41:36,006 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:41:36,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2021-05-06 11:41:36,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2934, Invalid=3546, Unknown=0, NotChecked=0, Total=6480 [2021-05-06 11:41:36,007 INFO L87 Difference]: Start difference. First operand 166 states and 167 transitions. Second operand has 81 states, 81 states have (on average 1.9876543209876543) internal successors, (161), 79 states have internal predecessors, (161), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:41:47,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:41:47,398 INFO L93 Difference]: Finished difference Result 393 states and 467 transitions. [2021-05-06 11:41:47,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 155 states. [2021-05-06 11:41:47,399 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 81 states have (on average 1.9876543209876543) internal successors, (161), 79 states have internal predecessors, (161), 2 states have call successors, (3), 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 165 [2021-05-06 11:41:47,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:41:47,400 INFO L225 Difference]: With dead ends: 393 [2021-05-06 11:41:47,400 INFO L226 Difference]: Without dead ends: 387 [2021-05-06 11:41:47,401 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 311 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 231 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14467 ImplicationChecksByTransitivity, 9724.8ms TimeCoverageRelationStatistics Valid=17569, Invalid=36487, Unknown=0, NotChecked=0, Total=54056 [2021-05-06 11:41:47,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2021-05-06 11:41:47,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 168. [2021-05-06 11:41:47,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 163 states have (on average 1.0122699386503067) internal successors, (165), 163 states have internal predecessors, (165), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:41:47,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 169 transitions. [2021-05-06 11:41:47,447 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 169 transitions. Word has length 165 [2021-05-06 11:41:47,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:41:47,447 INFO L480 AbstractCegarLoop]: Abstraction has 168 states and 169 transitions. [2021-05-06 11:41:47,448 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 81 states, 81 states have (on average 1.9876543209876543) internal successors, (161), 79 states have internal predecessors, (161), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:41:47,448 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 169 transitions. [2021-05-06 11:41:47,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-05-06 11:41:47,448 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:41:47,448 INFO L523 BasicCegarLoop]: trace histogram [75, 74, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:41:47,448 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75 [2021-05-06 11:41:47,448 INFO L428 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:41:47,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:41:47,449 INFO L82 PathProgramCache]: Analyzing trace with hash 462673164, now seen corresponding path program 74 times [2021-05-06 11:41:47,449 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:41:47,449 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [324567733] [2021-05-06 11:41:47,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:41:47,452 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:41:47,453 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:41:47,453 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:41:47,457 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:41:47,460 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:41:47,480 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:41:47,496 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:41:47,497 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:41:47,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:41:49,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:41:49,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:41:49,888 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:41:49,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:41:49,890 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:41:49,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:41:50,026 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:41:50,026 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [324567733] [2021-05-06 11:41:50,026 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [324567733] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:41:50,027 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:41:50,027 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [82] imperfect sequences [] total 82 [2021-05-06 11:41:50,027 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854515260] [2021-05-06 11:41:50,027 INFO L460 AbstractCegarLoop]: Interpolant automaton has 82 states [2021-05-06 11:41:50,027 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:41:50,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-05-06 11:41:50,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3011, Invalid=3631, Unknown=0, NotChecked=0, Total=6642 [2021-05-06 11:41:50,028 INFO L87 Difference]: Start difference. First operand 168 states and 169 transitions. Second operand has 82 states, 82 states have (on average 1.9878048780487805) internal successors, (163), 80 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:01,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:01,488 INFO L93 Difference]: Finished difference Result 398 states and 473 transitions. [2021-05-06 11:42:01,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 157 states. [2021-05-06 11:42:01,488 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 1.9878048780487805) internal successors, (163), 80 states have internal predecessors, (163), 2 states have call successors, (3), 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 167 [2021-05-06 11:42:01,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:01,489 INFO L225 Difference]: With dead ends: 398 [2021-05-06 11:42:01,489 INFO L226 Difference]: Without dead ends: 392 [2021-05-06 11:42:01,491 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 315 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 234 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14850 ImplicationChecksByTransitivity, 9866.8ms TimeCoverageRelationStatistics Valid=18031, Invalid=37429, Unknown=0, NotChecked=0, Total=55460 [2021-05-06 11:42:01,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 392 states. [2021-05-06 11:42:01,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 392 to 170. [2021-05-06 11:42:01,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 165 states have (on average 1.0121212121212122) internal successors, (167), 165 states have internal predecessors, (167), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:01,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 171 transitions. [2021-05-06 11:42:01,537 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 171 transitions. Word has length 167 [2021-05-06 11:42:01,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:01,537 INFO L480 AbstractCegarLoop]: Abstraction has 170 states and 171 transitions. [2021-05-06 11:42:01,537 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 82 states, 82 states have (on average 1.9878048780487805) internal successors, (163), 80 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:01,537 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 171 transitions. [2021-05-06 11:42:01,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2021-05-06 11:42:01,538 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:01,538 INFO L523 BasicCegarLoop]: trace histogram [76, 75, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:01,539 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76 [2021-05-06 11:42:01,539 INFO L428 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:01,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:01,539 INFO L82 PathProgramCache]: Analyzing trace with hash 1888783303, now seen corresponding path program 75 times [2021-05-06 11:42:01,539 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:01,539 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [160494301] [2021-05-06 11:42:01,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:01,546 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:42:01,561 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:01,562 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:01,565 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:42:01,569 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:42:01,577 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:42:01,593 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:42:01,594 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:42:01,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:03,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:03,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:03,888 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:42:03,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:03,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:03,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:04,040 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:04,041 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [160494301] [2021-05-06 11:42:04,041 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [160494301] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:04,041 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:04,041 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [83] imperfect sequences [] total 83 [2021-05-06 11:42:04,041 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607517049] [2021-05-06 11:42:04,041 INFO L460 AbstractCegarLoop]: Interpolant automaton has 83 states [2021-05-06 11:42:04,041 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:04,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-05-06 11:42:04,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3089, Invalid=3717, Unknown=0, NotChecked=0, Total=6806 [2021-05-06 11:42:04,042 INFO L87 Difference]: Start difference. First operand 170 states and 171 transitions. Second operand has 83 states, 83 states have (on average 1.9879518072289157) internal successors, (165), 81 states have internal predecessors, (165), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:15,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:15,807 INFO L93 Difference]: Finished difference Result 403 states and 479 transitions. [2021-05-06 11:42:15,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 159 states. [2021-05-06 11:42:15,808 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 1.9879518072289157) internal successors, (165), 81 states have internal predecessors, (165), 2 states have call successors, (3), 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 169 [2021-05-06 11:42:15,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:15,809 INFO L225 Difference]: With dead ends: 403 [2021-05-06 11:42:15,809 INFO L226 Difference]: Without dead ends: 397 [2021-05-06 11:42:15,821 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 237 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15238 ImplicationChecksByTransitivity, 9775.5ms TimeCoverageRelationStatistics Valid=18499, Invalid=38383, Unknown=0, NotChecked=0, Total=56882 [2021-05-06 11:42:15,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2021-05-06 11:42:15,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 172. [2021-05-06 11:42:15,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 167 states have (on average 1.0119760479041917) internal successors, (169), 167 states have internal predecessors, (169), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:15,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 173 transitions. [2021-05-06 11:42:15,889 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 173 transitions. Word has length 169 [2021-05-06 11:42:15,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:15,889 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 173 transitions. [2021-05-06 11:42:15,889 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 83 states, 83 states have (on average 1.9879518072289157) internal successors, (165), 81 states have internal predecessors, (165), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:15,889 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 173 transitions. [2021-05-06 11:42:15,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2021-05-06 11:42:15,890 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:15,890 INFO L523 BasicCegarLoop]: trace histogram [77, 76, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:15,890 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77 [2021-05-06 11:42:15,890 INFO L428 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:15,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:15,890 INFO L82 PathProgramCache]: Analyzing trace with hash -2008907838, now seen corresponding path program 76 times [2021-05-06 11:42:15,890 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:15,890 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [536152920] [2021-05-06 11:42:15,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:15,901 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:42:15,932 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:15,932 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:15,936 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:42:15,941 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:42:15,949 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:42:15,979 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:42:15,980 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:42:16,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:18,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:18,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:18,506 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:42:18,507 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:18,507 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:18,544 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:18,645 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:18,645 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [536152920] [2021-05-06 11:42:18,645 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [536152920] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:18,645 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:18,645 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [84] imperfect sequences [] total 84 [2021-05-06 11:42:18,645 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094792149] [2021-05-06 11:42:18,645 INFO L460 AbstractCegarLoop]: Interpolant automaton has 84 states [2021-05-06 11:42:18,646 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:18,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-05-06 11:42:18,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3168, Invalid=3804, Unknown=0, NotChecked=0, Total=6972 [2021-05-06 11:42:18,646 INFO L87 Difference]: Start difference. First operand 172 states and 173 transitions. Second operand has 84 states, 84 states have (on average 1.9880952380952381) internal successors, (167), 82 states have internal predecessors, (167), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:30,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:30,711 INFO L93 Difference]: Finished difference Result 408 states and 485 transitions. [2021-05-06 11:42:30,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 161 states. [2021-05-06 11:42:30,712 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 1.9880952380952381) internal successors, (167), 82 states have internal predecessors, (167), 2 states have call successors, (3), 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 171 [2021-05-06 11:42:30,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:30,713 INFO L225 Difference]: With dead ends: 408 [2021-05-06 11:42:30,713 INFO L226 Difference]: Without dead ends: 402 [2021-05-06 11:42:30,715 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 240 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15631 ImplicationChecksByTransitivity, 10195.1ms TimeCoverageRelationStatistics Valid=18973, Invalid=39349, Unknown=0, NotChecked=0, Total=58322 [2021-05-06 11:42:30,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2021-05-06 11:42:30,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 174. [2021-05-06 11:42:30,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 169 states have (on average 1.0118343195266273) internal successors, (171), 169 states have internal predecessors, (171), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:30,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 175 transitions. [2021-05-06 11:42:30,765 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 175 transitions. Word has length 171 [2021-05-06 11:42:30,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:30,766 INFO L480 AbstractCegarLoop]: Abstraction has 174 states and 175 transitions. [2021-05-06 11:42:30,766 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 84 states, 84 states have (on average 1.9880952380952381) internal successors, (167), 82 states have internal predecessors, (167), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:30,766 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 175 transitions. [2021-05-06 11:42:30,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-05-06 11:42:30,766 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:30,766 INFO L523 BasicCegarLoop]: trace histogram [78, 77, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:30,766 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78 [2021-05-06 11:42:30,766 INFO L428 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:30,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:30,767 INFO L82 PathProgramCache]: Analyzing trace with hash 1816355069, now seen corresponding path program 77 times [2021-05-06 11:42:30,767 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:30,767 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [78007574] [2021-05-06 11:42:30,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:30,771 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:42:30,772 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:30,772 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:30,776 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:42:30,780 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:42:30,801 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:42:30,817 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:42:30,818 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:42:30,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:33,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:33,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:33,362 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:42:33,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:33,364 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:33,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:33,504 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:33,504 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [78007574] [2021-05-06 11:42:33,504 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [78007574] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:33,505 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:33,505 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [85] imperfect sequences [] total 85 [2021-05-06 11:42:33,505 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171360404] [2021-05-06 11:42:33,505 INFO L460 AbstractCegarLoop]: Interpolant automaton has 85 states [2021-05-06 11:42:33,505 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:33,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-05-06 11:42:33,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3248, Invalid=3892, Unknown=0, NotChecked=0, Total=7140 [2021-05-06 11:42:33,506 INFO L87 Difference]: Start difference. First operand 174 states and 175 transitions. Second operand has 85 states, 85 states have (on average 1.988235294117647) internal successors, (169), 83 states have internal predecessors, (169), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:46,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:46,178 INFO L93 Difference]: Finished difference Result 413 states and 491 transitions. [2021-05-06 11:42:46,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 163 states. [2021-05-06 11:42:46,179 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 85 states have (on average 1.988235294117647) internal successors, (169), 83 states have internal predecessors, (169), 2 states have call successors, (3), 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 173 [2021-05-06 11:42:46,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:46,180 INFO L225 Difference]: With dead ends: 413 [2021-05-06 11:42:46,180 INFO L226 Difference]: Without dead ends: 407 [2021-05-06 11:42:46,182 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 243 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16029 ImplicationChecksByTransitivity, 10576.8ms TimeCoverageRelationStatistics Valid=19453, Invalid=40327, Unknown=0, NotChecked=0, Total=59780 [2021-05-06 11:42:46,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 407 states. [2021-05-06 11:42:46,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 407 to 176. [2021-05-06 11:42:46,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 171 states have (on average 1.0116959064327486) internal successors, (173), 171 states have internal predecessors, (173), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:46,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 177 transitions. [2021-05-06 11:42:46,232 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 177 transitions. Word has length 173 [2021-05-06 11:42:46,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:46,233 INFO L480 AbstractCegarLoop]: Abstraction has 176 states and 177 transitions. [2021-05-06 11:42:46,233 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 85 states, 85 states have (on average 1.988235294117647) internal successors, (169), 83 states have internal predecessors, (169), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:46,233 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 177 transitions. [2021-05-06 11:42:46,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2021-05-06 11:42:46,233 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:46,233 INFO L523 BasicCegarLoop]: trace histogram [79, 78, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:46,233 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79 [2021-05-06 11:42:46,233 INFO L428 AbstractCegarLoop]: === Iteration 81 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:46,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:46,234 INFO L82 PathProgramCache]: Analyzing trace with hash 1402003320, now seen corresponding path program 78 times [2021-05-06 11:42:46,234 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:46,234 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [483096693] [2021-05-06 11:42:46,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:46,237 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:42:46,252 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:46,252 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:46,256 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:42:46,260 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:42:46,268 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:42:46,284 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:42:46,285 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:42:46,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:48,920 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:48,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:48,923 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:42:48,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:48,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:48,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:49,066 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:49,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [483096693] [2021-05-06 11:42:49,066 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [483096693] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:49,066 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:49,066 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [86] imperfect sequences [] total 86 [2021-05-06 11:42:49,067 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965689521] [2021-05-06 11:42:49,067 INFO L460 AbstractCegarLoop]: Interpolant automaton has 86 states [2021-05-06 11:42:49,067 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:49,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-05-06 11:42:49,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3329, Invalid=3981, Unknown=0, NotChecked=0, Total=7310 [2021-05-06 11:42:49,068 INFO L87 Difference]: Start difference. First operand 176 states and 177 transitions. Second operand has 86 states, 86 states have (on average 1.9883720930232558) internal successors, (171), 84 states have internal predecessors, (171), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:02,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:02,168 INFO L93 Difference]: Finished difference Result 418 states and 497 transitions. [2021-05-06 11:43:02,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 165 states. [2021-05-06 11:43:02,168 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 1.9883720930232558) internal successors, (171), 84 states have internal predecessors, (171), 2 states have call successors, (3), 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 175 [2021-05-06 11:43:02,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:02,170 INFO L225 Difference]: With dead ends: 418 [2021-05-06 11:43:02,170 INFO L226 Difference]: Without dead ends: 412 [2021-05-06 11:43:02,172 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 246 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16432 ImplicationChecksByTransitivity, 10868.6ms TimeCoverageRelationStatistics Valid=19939, Invalid=41317, Unknown=0, NotChecked=0, Total=61256 [2021-05-06 11:43:02,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 412 states. [2021-05-06 11:43:02,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 412 to 178. [2021-05-06 11:43:02,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 173 states have (on average 1.0115606936416186) internal successors, (175), 173 states have internal predecessors, (175), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:02,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 179 transitions. [2021-05-06 11:43:02,224 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 179 transitions. Word has length 175 [2021-05-06 11:43:02,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:02,224 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 179 transitions. [2021-05-06 11:43:02,224 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 86 states, 86 states have (on average 1.9883720930232558) internal successors, (171), 84 states have internal predecessors, (171), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:02,224 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 179 transitions. [2021-05-06 11:43:02,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2021-05-06 11:43:02,241 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:02,241 INFO L523 BasicCegarLoop]: trace histogram [80, 79, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:43:02,241 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80 [2021-05-06 11:43:02,241 INFO L428 AbstractCegarLoop]: === Iteration 82 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:02,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:02,241 INFO L82 PathProgramCache]: Analyzing trace with hash -1653036237, now seen corresponding path program 79 times [2021-05-06 11:43:02,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:02,242 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [227038141] [2021-05-06 11:43:02,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:02,258 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:43:02,274 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:02,274 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:02,278 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:43:02,281 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:43:02,301 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:43:02,317 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:43:02,318 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:43:02,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:04,995 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:04,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:04,997 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:43:04,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:04,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:05,038 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:05,143 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:05,143 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [227038141] [2021-05-06 11:43:05,143 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [227038141] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:05,143 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:05,143 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [87] imperfect sequences [] total 87 [2021-05-06 11:43:05,144 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244626610] [2021-05-06 11:43:05,144 INFO L460 AbstractCegarLoop]: Interpolant automaton has 87 states [2021-05-06 11:43:05,144 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:05,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-05-06 11:43:05,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3411, Invalid=4071, Unknown=0, NotChecked=0, Total=7482 [2021-05-06 11:43:05,145 INFO L87 Difference]: Start difference. First operand 178 states and 179 transitions. Second operand has 87 states, 87 states have (on average 1.9885057471264367) internal successors, (173), 85 states have internal predecessors, (173), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:18,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:18,566 INFO L93 Difference]: Finished difference Result 423 states and 503 transitions. [2021-05-06 11:43:18,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 167 states. [2021-05-06 11:43:18,566 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 1.9885057471264367) internal successors, (173), 85 states have internal predecessors, (173), 2 states have call successors, (3), 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 177 [2021-05-06 11:43:18,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:18,567 INFO L225 Difference]: With dead ends: 423 [2021-05-06 11:43:18,567 INFO L226 Difference]: Without dead ends: 417 [2021-05-06 11:43:18,569 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 249 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16840 ImplicationChecksByTransitivity, 11057.8ms TimeCoverageRelationStatistics Valid=20431, Invalid=42319, Unknown=0, NotChecked=0, Total=62750 [2021-05-06 11:43:18,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2021-05-06 11:43:18,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 180. [2021-05-06 11:43:18,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 175 states have (on average 1.0114285714285713) internal successors, (177), 175 states have internal predecessors, (177), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:18,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 181 transitions. [2021-05-06 11:43:18,623 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 181 transitions. Word has length 177 [2021-05-06 11:43:18,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:18,623 INFO L480 AbstractCegarLoop]: Abstraction has 180 states and 181 transitions. [2021-05-06 11:43:18,623 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 87 states, 87 states have (on average 1.9885057471264367) internal successors, (173), 85 states have internal predecessors, (173), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:18,623 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 181 transitions. [2021-05-06 11:43:18,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2021-05-06 11:43:18,624 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:18,624 INFO L523 BasicCegarLoop]: trace histogram [81, 80, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:43:18,624 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81 [2021-05-06 11:43:18,624 INFO L428 AbstractCegarLoop]: === Iteration 83 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:18,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:18,624 INFO L82 PathProgramCache]: Analyzing trace with hash 211579950, now seen corresponding path program 80 times [2021-05-06 11:43:18,624 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:18,624 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [239340552] [2021-05-06 11:43:18,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:18,628 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:43:18,643 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:18,644 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:18,648 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:43:18,651 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:43:18,660 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:43:18,675 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:43:18,675 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:43:18,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:21,412 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:21,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:21,414 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:43:21,415 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:21,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:21,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:21,562 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:21,562 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [239340552] [2021-05-06 11:43:21,562 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [239340552] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:21,562 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:21,562 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [88] imperfect sequences [] total 88 [2021-05-06 11:43:21,562 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1393125368] [2021-05-06 11:43:21,562 INFO L460 AbstractCegarLoop]: Interpolant automaton has 88 states [2021-05-06 11:43:21,562 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:21,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2021-05-06 11:43:21,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3494, Invalid=4162, Unknown=0, NotChecked=0, Total=7656 [2021-05-06 11:43:21,563 INFO L87 Difference]: Start difference. First operand 180 states and 181 transitions. Second operand has 88 states, 88 states have (on average 1.9886363636363635) internal successors, (175), 86 states have internal predecessors, (175), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:35,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:35,214 INFO L93 Difference]: Finished difference Result 428 states and 509 transitions. [2021-05-06 11:43:35,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 169 states. [2021-05-06 11:43:35,214 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 1.9886363636363635) internal successors, (175), 86 states have internal predecessors, (175), 2 states have call successors, (3), 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 179 [2021-05-06 11:43:35,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:35,216 INFO L225 Difference]: With dead ends: 428 [2021-05-06 11:43:35,216 INFO L226 Difference]: Without dead ends: 422 [2021-05-06 11:43:35,218 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 252 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17253 ImplicationChecksByTransitivity, 11270.9ms TimeCoverageRelationStatistics Valid=20929, Invalid=43333, Unknown=0, NotChecked=0, Total=64262 [2021-05-06 11:43:35,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 422 states. [2021-05-06 11:43:35,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 422 to 182. [2021-05-06 11:43:35,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 177 states have (on average 1.0112994350282485) internal successors, (179), 177 states have internal predecessors, (179), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:35,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 183 transitions. [2021-05-06 11:43:35,297 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 183 transitions. Word has length 179 [2021-05-06 11:43:35,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:35,298 INFO L480 AbstractCegarLoop]: Abstraction has 182 states and 183 transitions. [2021-05-06 11:43:35,298 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 88 states, 88 states have (on average 1.9886363636363635) internal successors, (175), 86 states have internal predecessors, (175), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:35,298 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 183 transitions. [2021-05-06 11:43:35,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2021-05-06 11:43:35,298 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:35,298 INFO L523 BasicCegarLoop]: trace histogram [82, 81, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:43:35,298 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82 [2021-05-06 11:43:35,298 INFO L428 AbstractCegarLoop]: === Iteration 84 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:35,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:35,299 INFO L82 PathProgramCache]: Analyzing trace with hash 1106373225, now seen corresponding path program 81 times [2021-05-06 11:43:35,299 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:35,299 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [790449663] [2021-05-06 11:43:35,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:35,302 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:43:35,317 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:35,318 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:35,321 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:43:35,340 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:43:35,357 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:43:35,372 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:43:35,373 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:43:35,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:38,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:38,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:38,146 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:43:38,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:38,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:38,187 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:38,294 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:38,295 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [790449663] [2021-05-06 11:43:38,295 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [790449663] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:38,295 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:38,295 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [89] imperfect sequences [] total 89 [2021-05-06 11:43:38,295 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561474527] [2021-05-06 11:43:38,295 INFO L460 AbstractCegarLoop]: Interpolant automaton has 89 states [2021-05-06 11:43:38,295 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:38,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2021-05-06 11:43:38,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3578, Invalid=4254, Unknown=0, NotChecked=0, Total=7832 [2021-05-06 11:43:38,296 INFO L87 Difference]: Start difference. First operand 182 states and 183 transitions. Second operand has 89 states, 89 states have (on average 1.9887640449438202) internal successors, (177), 87 states have internal predecessors, (177), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:52,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:52,447 INFO L93 Difference]: Finished difference Result 433 states and 515 transitions. [2021-05-06 11:43:52,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 171 states. [2021-05-06 11:43:52,447 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 1.9887640449438202) internal successors, (177), 87 states have internal predecessors, (177), 2 states have call successors, (3), 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 181 [2021-05-06 11:43:52,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:52,448 INFO L225 Difference]: With dead ends: 433 [2021-05-06 11:43:52,448 INFO L226 Difference]: Without dead ends: 427 [2021-05-06 11:43:52,450 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 255 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17671 ImplicationChecksByTransitivity, 11619.3ms TimeCoverageRelationStatistics Valid=21433, Invalid=44359, Unknown=0, NotChecked=0, Total=65792 [2021-05-06 11:43:52,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 427 states. [2021-05-06 11:43:52,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 427 to 184. [2021-05-06 11:43:52,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 179 states have (on average 1.011173184357542) internal successors, (181), 179 states have internal predecessors, (181), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:52,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 185 transitions. [2021-05-06 11:43:52,505 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 185 transitions. Word has length 181 [2021-05-06 11:43:52,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:52,506 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 185 transitions. [2021-05-06 11:43:52,506 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 89 states, 89 states have (on average 1.9887640449438202) internal successors, (177), 87 states have internal predecessors, (177), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:52,506 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 185 transitions. [2021-05-06 11:43:52,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2021-05-06 11:43:52,506 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:52,506 INFO L523 BasicCegarLoop]: trace histogram [83, 82, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:43:52,507 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83 [2021-05-06 11:43:52,507 INFO L428 AbstractCegarLoop]: === Iteration 85 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:52,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:52,507 INFO L82 PathProgramCache]: Analyzing trace with hash 2009251300, now seen corresponding path program 82 times [2021-05-06 11:43:52,508 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:52,508 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1558468510] [2021-05-06 11:43:52,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:52,511 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:43:52,512 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:52,512 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:52,516 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:43:52,519 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:43:52,539 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:43:52,554 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:43:52,555 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:43:52,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:55,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:55,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:55,022 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:43:55,023 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:55,023 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:55,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:55,172 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:55,172 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1558468510] [2021-05-06 11:43:55,172 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1558468510] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:55,172 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:55,172 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [90] imperfect sequences [] total 90 [2021-05-06 11:43:55,172 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651197453] [2021-05-06 11:43:55,172 INFO L460 AbstractCegarLoop]: Interpolant automaton has 90 states [2021-05-06 11:43:55,173 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:55,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2021-05-06 11:43:55,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3663, Invalid=4347, Unknown=0, NotChecked=0, Total=8010 [2021-05-06 11:43:55,173 INFO L87 Difference]: Start difference. First operand 184 states and 185 transitions. Second operand has 90 states, 90 states have (on average 1.988888888888889) internal successors, (179), 88 states have internal predecessors, (179), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:44:09,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:44:09,750 INFO L93 Difference]: Finished difference Result 438 states and 521 transitions. [2021-05-06 11:44:09,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 173 states. [2021-05-06 11:44:09,750 INFO L78 Accepts]: Start accepts. Automaton has has 90 states, 90 states have (on average 1.988888888888889) internal successors, (179), 88 states have internal predecessors, (179), 2 states have call successors, (3), 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 183 [2021-05-06 11:44:09,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:44:09,751 INFO L225 Difference]: With dead ends: 438 [2021-05-06 11:44:09,751 INFO L226 Difference]: Without dead ends: 432 [2021-05-06 11:44:09,753 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 258 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18094 ImplicationChecksByTransitivity, 11475.2ms TimeCoverageRelationStatistics Valid=21943, Invalid=45397, Unknown=0, NotChecked=0, Total=67340 [2021-05-06 11:44:09,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 432 states. [2021-05-06 11:44:09,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 432 to 186. [2021-05-06 11:44:09,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 181 states have (on average 1.011049723756906) internal successors, (183), 181 states have internal predecessors, (183), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:44:09,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 187 transitions. [2021-05-06 11:44:09,811 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 187 transitions. Word has length 183 [2021-05-06 11:44:09,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:44:09,811 INFO L480 AbstractCegarLoop]: Abstraction has 186 states and 187 transitions. [2021-05-06 11:44:09,811 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 90 states, 90 states have (on average 1.988888888888889) internal successors, (179), 88 states have internal predecessors, (179), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:44:09,811 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 187 transitions. [2021-05-06 11:44:09,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2021-05-06 11:44:09,812 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:44:09,812 INFO L523 BasicCegarLoop]: trace histogram [84, 83, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:44:09,812 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84 [2021-05-06 11:44:09,812 INFO L428 AbstractCegarLoop]: === Iteration 86 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:44:09,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:44:09,812 INFO L82 PathProgramCache]: Analyzing trace with hash 2091687583, now seen corresponding path program 83 times [2021-05-06 11:44:09,812 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:44:09,812 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [481633510] [2021-05-06 11:44:09,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:44:09,816 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:44:09,817 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:09,817 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:09,821 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:44:09,824 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:44:09,844 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:44:09,860 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:44:09,861 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:44:09,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:12,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:44:12,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:12,831 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:44:12,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:44:12,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:44:12,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:44:12,985 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:44:12,985 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [481633510] [2021-05-06 11:44:12,985 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [481633510] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:44:12,985 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:44:12,985 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [91] imperfect sequences [] total 91 [2021-05-06 11:44:12,985 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69519180] [2021-05-06 11:44:12,985 INFO L460 AbstractCegarLoop]: Interpolant automaton has 91 states [2021-05-06 11:44:12,985 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:44:12,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2021-05-06 11:44:12,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3749, Invalid=4441, Unknown=0, NotChecked=0, Total=8190 [2021-05-06 11:44:12,986 INFO L87 Difference]: Start difference. First operand 186 states and 187 transitions. Second operand has 91 states, 91 states have (on average 1.989010989010989) internal successors, (181), 89 states have internal predecessors, (181), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:44:28,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:44:28,014 INFO L93 Difference]: Finished difference Result 443 states and 527 transitions. [2021-05-06 11:44:28,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 175 states. [2021-05-06 11:44:28,015 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 1.989010989010989) internal successors, (181), 89 states have internal predecessors, (181), 2 states have call successors, (3), 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 185 [2021-05-06 11:44:28,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:44:28,016 INFO L225 Difference]: With dead ends: 443 [2021-05-06 11:44:28,016 INFO L226 Difference]: Without dead ends: 437 [2021-05-06 11:44:28,018 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 351 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 261 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18522 ImplicationChecksByTransitivity, 12259.4ms TimeCoverageRelationStatistics Valid=22459, Invalid=46447, Unknown=0, NotChecked=0, Total=68906 [2021-05-06 11:44:28,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 437 states. [2021-05-06 11:44:28,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 437 to 188. [2021-05-06 11:44:28,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 188 states, 183 states have (on average 1.010928961748634) internal successors, (185), 183 states have internal predecessors, (185), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:44:28,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 189 transitions. [2021-05-06 11:44:28,078 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 189 transitions. Word has length 185 [2021-05-06 11:44:28,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:44:28,078 INFO L480 AbstractCegarLoop]: Abstraction has 188 states and 189 transitions. [2021-05-06 11:44:28,078 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 91 states, 91 states have (on average 1.989010989010989) internal successors, (181), 89 states have internal predecessors, (181), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:44:28,078 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 189 transitions. [2021-05-06 11:44:28,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2021-05-06 11:44:28,078 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:44:28,079 INFO L523 BasicCegarLoop]: trace histogram [85, 84, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:44:28,079 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable85 [2021-05-06 11:44:28,079 INFO L428 AbstractCegarLoop]: === Iteration 87 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:44:28,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:44:28,079 INFO L82 PathProgramCache]: Analyzing trace with hash -291423078, now seen corresponding path program 84 times [2021-05-06 11:44:28,079 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:44:28,079 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1714074332] [2021-05-06 11:44:28,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:44:28,083 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:44:28,083 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:28,084 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:28,087 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:44:28,091 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:44:28,112 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:44:28,128 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:44:28,129 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:44:28,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:31,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:44:31,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:31,129 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:44:31,130 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:44:31,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:44:31,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:44:31,285 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:44:31,285 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1714074332] [2021-05-06 11:44:31,286 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1714074332] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:44:31,286 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:44:31,286 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [92] imperfect sequences [] total 92 [2021-05-06 11:44:31,286 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3713994] [2021-05-06 11:44:31,286 INFO L460 AbstractCegarLoop]: Interpolant automaton has 92 states [2021-05-06 11:44:31,286 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:44:31,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2021-05-06 11:44:31,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3836, Invalid=4536, Unknown=0, NotChecked=0, Total=8372 [2021-05-06 11:44:31,287 INFO L87 Difference]: Start difference. First operand 188 states and 189 transitions. Second operand has 92 states, 92 states have (on average 1.9891304347826086) internal successors, (183), 90 states have internal predecessors, (183), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:44:46,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:44:46,682 INFO L93 Difference]: Finished difference Result 448 states and 533 transitions. [2021-05-06 11:44:46,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 177 states. [2021-05-06 11:44:46,683 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 92 states have (on average 1.9891304347826086) internal successors, (183), 90 states have internal predecessors, (183), 2 states have call successors, (3), 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 187 [2021-05-06 11:44:46,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:44:46,684 INFO L225 Difference]: With dead ends: 448 [2021-05-06 11:44:46,684 INFO L226 Difference]: Without dead ends: 442 [2021-05-06 11:44:46,687 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 264 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18955 ImplicationChecksByTransitivity, 12496.4ms TimeCoverageRelationStatistics Valid=22981, Invalid=47509, Unknown=0, NotChecked=0, Total=70490 [2021-05-06 11:44:46,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2021-05-06 11:44:46,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 190. [2021-05-06 11:44:46,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 185 states have (on average 1.0108108108108107) internal successors, (187), 185 states have internal predecessors, (187), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:44:46,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 191 transitions. [2021-05-06 11:44:46,746 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 191 transitions. Word has length 187 [2021-05-06 11:44:46,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:44:46,746 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 191 transitions. [2021-05-06 11:44:46,746 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 92 states, 92 states have (on average 1.9891304347826086) internal successors, (183), 90 states have internal predecessors, (183), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:44:46,747 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 191 transitions. [2021-05-06 11:44:46,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2021-05-06 11:44:46,747 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:44:46,747 INFO L523 BasicCegarLoop]: trace histogram [86, 85, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:44:46,747 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86 [2021-05-06 11:44:46,747 INFO L428 AbstractCegarLoop]: === Iteration 88 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:44:46,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:44:46,748 INFO L82 PathProgramCache]: Analyzing trace with hash -1243199531, now seen corresponding path program 85 times [2021-05-06 11:44:46,748 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:44:46,748 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1816779969] [2021-05-06 11:44:46,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:44:46,751 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:44:46,766 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:46,767 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:46,771 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:44:46,774 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:44:46,783 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:44:46,798 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:44:46,799 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:44:46,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:49,911 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:44:49,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:49,914 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:44:49,915 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:44:49,915 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:44:49,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:44:50,072 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:44:50,072 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1816779969] [2021-05-06 11:44:50,072 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1816779969] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:44:50,072 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:44:50,073 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [93] imperfect sequences [] total 93 [2021-05-06 11:44:50,073 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1367412734] [2021-05-06 11:44:50,073 INFO L460 AbstractCegarLoop]: Interpolant automaton has 93 states [2021-05-06 11:44:50,073 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:44:50,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2021-05-06 11:44:50,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3924, Invalid=4632, Unknown=0, NotChecked=0, Total=8556 [2021-05-06 11:44:50,074 INFO L87 Difference]: Start difference. First operand 190 states and 191 transitions. Second operand has 93 states, 93 states have (on average 1.989247311827957) internal successors, (185), 91 states have internal predecessors, (185), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:05,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:45:05,770 INFO L93 Difference]: Finished difference Result 453 states and 539 transitions. [2021-05-06 11:45:05,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 179 states. [2021-05-06 11:45:05,771 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 1.989247311827957) internal successors, (185), 91 states have internal predecessors, (185), 2 states have call successors, (3), 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 189 [2021-05-06 11:45:05,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:45:05,772 INFO L225 Difference]: With dead ends: 453 [2021-05-06 11:45:05,772 INFO L226 Difference]: Without dead ends: 447 [2021-05-06 11:45:05,774 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 267 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19393 ImplicationChecksByTransitivity, 12689.1ms TimeCoverageRelationStatistics Valid=23509, Invalid=48583, Unknown=0, NotChecked=0, Total=72092 [2021-05-06 11:45:05,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 447 states. [2021-05-06 11:45:05,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 447 to 192. [2021-05-06 11:45:05,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 187 states have (on average 1.0106951871657754) internal successors, (189), 187 states have internal predecessors, (189), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:05,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 193 transitions. [2021-05-06 11:45:05,861 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 193 transitions. Word has length 189 [2021-05-06 11:45:05,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:45:05,862 INFO L480 AbstractCegarLoop]: Abstraction has 192 states and 193 transitions. [2021-05-06 11:45:05,862 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 93 states, 93 states have (on average 1.989247311827957) internal successors, (185), 91 states have internal predecessors, (185), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:05,862 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 193 transitions. [2021-05-06 11:45:05,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-05-06 11:45:05,862 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:45:05,862 INFO L523 BasicCegarLoop]: trace histogram [87, 86, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:45:05,862 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable87 [2021-05-06 11:45:05,862 INFO L428 AbstractCegarLoop]: === Iteration 89 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:45:05,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:45:05,863 INFO L82 PathProgramCache]: Analyzing trace with hash -1072336816, now seen corresponding path program 86 times [2021-05-06 11:45:05,863 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:45:05,863 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [113366774] [2021-05-06 11:45:05,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:45:05,866 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:45:05,882 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:05,883 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:05,886 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:45:05,890 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:45:05,898 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:45:05,915 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:45:05,916 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:45:05,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:09,070 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:45:09,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:09,072 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:45:09,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:45:09,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:45:09,116 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:45:09,231 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:45:09,231 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [113366774] [2021-05-06 11:45:09,231 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [113366774] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:45:09,231 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:45:09,231 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [94] imperfect sequences [] total 94 [2021-05-06 11:45:09,231 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823242539] [2021-05-06 11:45:09,231 INFO L460 AbstractCegarLoop]: Interpolant automaton has 94 states [2021-05-06 11:45:09,231 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:45:09,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2021-05-06 11:45:09,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4013, Invalid=4729, Unknown=0, NotChecked=0, Total=8742 [2021-05-06 11:45:09,232 INFO L87 Difference]: Start difference. First operand 192 states and 193 transitions. Second operand has 94 states, 94 states have (on average 1.9893617021276595) internal successors, (187), 92 states have internal predecessors, (187), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:25,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:45:25,119 INFO L93 Difference]: Finished difference Result 458 states and 545 transitions. [2021-05-06 11:45:25,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 181 states. [2021-05-06 11:45:25,120 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 1.9893617021276595) internal successors, (187), 92 states have internal predecessors, (187), 2 states have call successors, (3), 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 191 [2021-05-06 11:45:25,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:45:25,121 INFO L225 Difference]: With dead ends: 458 [2021-05-06 11:45:25,121 INFO L226 Difference]: Without dead ends: 452 [2021-05-06 11:45:25,123 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 270 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19836 ImplicationChecksByTransitivity, 12652.9ms TimeCoverageRelationStatistics Valid=24043, Invalid=49669, Unknown=0, NotChecked=0, Total=73712 [2021-05-06 11:45:25,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 452 states. [2021-05-06 11:45:25,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 452 to 194. [2021-05-06 11:45:25,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 189 states have (on average 1.0105820105820107) internal successors, (191), 189 states have internal predecessors, (191), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:25,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 195 transitions. [2021-05-06 11:45:25,185 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 195 transitions. Word has length 191 [2021-05-06 11:45:25,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:45:25,186 INFO L480 AbstractCegarLoop]: Abstraction has 194 states and 195 transitions. [2021-05-06 11:45:25,186 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 94 states, 94 states have (on average 1.9893617021276595) internal successors, (187), 92 states have internal predecessors, (187), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:25,186 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 195 transitions. [2021-05-06 11:45:25,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2021-05-06 11:45:25,186 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:45:25,186 INFO L523 BasicCegarLoop]: trace histogram [88, 87, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:45:25,186 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable88 [2021-05-06 11:45:25,186 INFO L428 AbstractCegarLoop]: === Iteration 90 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:45:25,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:45:25,187 INFO L82 PathProgramCache]: Analyzing trace with hash -82024949, now seen corresponding path program 87 times [2021-05-06 11:45:25,187 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:45:25,187 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2005483896] [2021-05-06 11:45:25,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:45:25,197 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:45:25,212 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:25,213 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:25,216 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:45:25,220 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:45:25,228 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:45:25,244 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:45:25,247 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:45:25,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:28,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:45:28,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:28,524 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:45:28,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:45:28,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:45:28,565 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:45:28,680 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:45:28,680 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2005483896] [2021-05-06 11:45:28,680 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2005483896] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:45:28,680 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:45:28,680 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [95] imperfect sequences [] total 95 [2021-05-06 11:45:28,680 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065597701] [2021-05-06 11:45:28,680 INFO L460 AbstractCegarLoop]: Interpolant automaton has 95 states [2021-05-06 11:45:28,680 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:45:28,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2021-05-06 11:45:28,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4103, Invalid=4827, Unknown=0, NotChecked=0, Total=8930 [2021-05-06 11:45:28,681 INFO L87 Difference]: Start difference. First operand 194 states and 195 transitions. Second operand has 95 states, 95 states have (on average 1.9894736842105263) internal successors, (189), 93 states have internal predecessors, (189), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:44,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:45:44,936 INFO L93 Difference]: Finished difference Result 463 states and 551 transitions. [2021-05-06 11:45:44,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 183 states. [2021-05-06 11:45:44,937 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 95 states have (on average 1.9894736842105263) internal successors, (189), 93 states have internal predecessors, (189), 2 states have call successors, (3), 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 193 [2021-05-06 11:45:44,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:45:44,938 INFO L225 Difference]: With dead ends: 463 [2021-05-06 11:45:44,938 INFO L226 Difference]: Without dead ends: 457 [2021-05-06 11:45:44,941 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 367 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 273 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20284 ImplicationChecksByTransitivity, 12955.9ms TimeCoverageRelationStatistics Valid=24583, Invalid=50767, Unknown=0, NotChecked=0, Total=75350 [2021-05-06 11:45:44,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 457 states. [2021-05-06 11:45:45,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 457 to 196. [2021-05-06 11:45:45,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 191 states have (on average 1.0104712041884816) internal successors, (193), 191 states have internal predecessors, (193), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:45,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 197 transitions. [2021-05-06 11:45:45,021 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 197 transitions. Word has length 193 [2021-05-06 11:45:45,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:45:45,021 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 197 transitions. [2021-05-06 11:45:45,021 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 95 states, 95 states have (on average 1.9894736842105263) internal successors, (189), 93 states have internal predecessors, (189), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:45,021 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 197 transitions. [2021-05-06 11:45:45,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2021-05-06 11:45:45,021 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:45:45,022 INFO L523 BasicCegarLoop]: trace histogram [89, 88, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:45:45,022 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable89 [2021-05-06 11:45:45,022 INFO L428 AbstractCegarLoop]: === Iteration 91 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:45:45,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:45:45,022 INFO L82 PathProgramCache]: Analyzing trace with hash -1875060474, now seen corresponding path program 88 times [2021-05-06 11:45:45,022 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:45:45,022 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1907152916] [2021-05-06 11:45:45,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:45:45,026 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:45:45,042 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:45,042 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:45,046 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:45:45,049 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:45:45,058 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:45:45,075 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:45:45,076 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:45:45,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:48,433 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:45:48,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:48,436 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:45:48,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:45:48,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:45:48,480 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:45:48,597 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:45:48,597 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1907152916] [2021-05-06 11:45:48,597 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1907152916] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:45:48,597 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:45:48,597 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [96] imperfect sequences [] total 96 [2021-05-06 11:45:48,597 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [566006409] [2021-05-06 11:45:48,597 INFO L460 AbstractCegarLoop]: Interpolant automaton has 96 states [2021-05-06 11:45:48,597 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:45:48,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2021-05-06 11:45:48,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4194, Invalid=4926, Unknown=0, NotChecked=0, Total=9120 [2021-05-06 11:45:48,599 INFO L87 Difference]: Start difference. First operand 196 states and 197 transitions. Second operand has 96 states, 96 states have (on average 1.9895833333333333) internal successors, (191), 94 states have internal predecessors, (191), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:46:05,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:46:05,551 INFO L93 Difference]: Finished difference Result 468 states and 557 transitions. [2021-05-06 11:46:05,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 185 states. [2021-05-06 11:46:05,551 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 96 states have (on average 1.9895833333333333) internal successors, (191), 94 states have internal predecessors, (191), 2 states have call successors, (3), 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 195 [2021-05-06 11:46:05,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:46:05,553 INFO L225 Difference]: With dead ends: 468 [2021-05-06 11:46:05,553 INFO L226 Difference]: Without dead ends: 462 [2021-05-06 11:46:05,555 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 371 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 276 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20737 ImplicationChecksByTransitivity, 13600.1ms TimeCoverageRelationStatistics Valid=25129, Invalid=51877, Unknown=0, NotChecked=0, Total=77006 [2021-05-06 11:46:05,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 462 states. [2021-05-06 11:46:05,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 462 to 198. [2021-05-06 11:46:05,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 193 states have (on average 1.0103626943005182) internal successors, (195), 193 states have internal predecessors, (195), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:46:05,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 199 transitions. [2021-05-06 11:46:05,619 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 199 transitions. Word has length 195 [2021-05-06 11:46:05,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:46:05,619 INFO L480 AbstractCegarLoop]: Abstraction has 198 states and 199 transitions. [2021-05-06 11:46:05,619 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 96 states, 96 states have (on average 1.9895833333333333) internal successors, (191), 94 states have internal predecessors, (191), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:46:05,619 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 199 transitions. [2021-05-06 11:46:05,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2021-05-06 11:46:05,620 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:46:05,620 INFO L523 BasicCegarLoop]: trace histogram [90, 89, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:46:05,620 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90 [2021-05-06 11:46:05,620 INFO L428 AbstractCegarLoop]: === Iteration 92 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:46:05,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:46:05,620 INFO L82 PathProgramCache]: Analyzing trace with hash 1594652993, now seen corresponding path program 89 times [2021-05-06 11:46:05,620 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:46:05,621 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1633739179] [2021-05-06 11:46:05,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:46:05,624 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:46:05,625 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:05,625 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:05,628 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:46:05,632 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:46:05,652 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:46:05,668 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:46:05,668 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:46:05,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:09,090 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:46:09,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:09,092 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:46:09,093 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:46:09,093 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:46:09,138 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:46:09,254 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:46:09,254 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1633739179] [2021-05-06 11:46:09,254 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1633739179] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:46:09,254 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:46:09,254 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [97] imperfect sequences [] total 97 [2021-05-06 11:46:09,254 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647806037] [2021-05-06 11:46:09,255 INFO L460 AbstractCegarLoop]: Interpolant automaton has 97 states [2021-05-06 11:46:09,255 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:46:09,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-05-06 11:46:09,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4286, Invalid=5026, Unknown=0, NotChecked=0, Total=9312 [2021-05-06 11:46:09,256 INFO L87 Difference]: Start difference. First operand 198 states and 199 transitions. Second operand has 97 states, 97 states have (on average 1.9896907216494846) internal successors, (193), 95 states have internal predecessors, (193), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:46:26,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:46:26,441 INFO L93 Difference]: Finished difference Result 473 states and 563 transitions. [2021-05-06 11:46:26,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 187 states. [2021-05-06 11:46:26,441 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 1.9896907216494846) internal successors, (193), 95 states have internal predecessors, (193), 2 states have call successors, (3), 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 197 [2021-05-06 11:46:26,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:46:26,443 INFO L225 Difference]: With dead ends: 473 [2021-05-06 11:46:26,443 INFO L226 Difference]: Without dead ends: 467 [2021-05-06 11:46:26,445 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 375 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 279 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21195 ImplicationChecksByTransitivity, 13794.6ms TimeCoverageRelationStatistics Valid=25681, Invalid=52999, Unknown=0, NotChecked=0, Total=78680 [2021-05-06 11:46:26,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 467 states. [2021-05-06 11:46:26,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 467 to 200. [2021-05-06 11:46:26,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 195 states have (on average 1.0102564102564102) internal successors, (197), 195 states have internal predecessors, (197), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:46:26,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 201 transitions. [2021-05-06 11:46:26,512 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 201 transitions. Word has length 197 [2021-05-06 11:46:26,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:46:26,512 INFO L480 AbstractCegarLoop]: Abstraction has 200 states and 201 transitions. [2021-05-06 11:46:26,512 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 97 states, 97 states have (on average 1.9896907216494846) internal successors, (193), 95 states have internal predecessors, (193), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:46:26,512 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 201 transitions. [2021-05-06 11:46:26,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2021-05-06 11:46:26,513 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:46:26,513 INFO L523 BasicCegarLoop]: trace histogram [91, 90, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:46:26,513 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91 [2021-05-06 11:46:26,513 INFO L428 AbstractCegarLoop]: === Iteration 93 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:46:26,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:46:26,513 INFO L82 PathProgramCache]: Analyzing trace with hash -1200294212, now seen corresponding path program 90 times [2021-05-06 11:46:26,514 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:46:26,514 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1080585295] [2021-05-06 11:46:26,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:46:26,517 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:46:26,532 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:26,533 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:26,536 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:46:26,540 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:46:26,548 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:46:26,564 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:46:26,565 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:46:26,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:29,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:46:29,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:29,807 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:46:29,808 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:46:29,808 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:46:29,858 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:46:30,002 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:46:30,002 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1080585295] [2021-05-06 11:46:30,002 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1080585295] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:46:30,003 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:46:30,003 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [98] imperfect sequences [] total 98 [2021-05-06 11:46:30,003 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588958410] [2021-05-06 11:46:30,003 INFO L460 AbstractCegarLoop]: Interpolant automaton has 98 states [2021-05-06 11:46:30,003 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:46:30,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-05-06 11:46:30,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4379, Invalid=5127, Unknown=0, NotChecked=0, Total=9506 [2021-05-06 11:46:30,005 INFO L87 Difference]: Start difference. First operand 200 states and 201 transitions. Second operand has 98 states, 98 states have (on average 1.989795918367347) internal successors, (195), 96 states have internal predecessors, (195), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:46:47,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:46:47,621 INFO L93 Difference]: Finished difference Result 478 states and 569 transitions. [2021-05-06 11:46:47,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 189 states. [2021-05-06 11:46:47,622 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 1.989795918367347) internal successors, (195), 96 states have internal predecessors, (195), 2 states have call successors, (3), 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 199 [2021-05-06 11:46:47,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:46:47,623 INFO L225 Difference]: With dead ends: 478 [2021-05-06 11:46:47,623 INFO L226 Difference]: Without dead ends: 472 [2021-05-06 11:46:47,625 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 379 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 282 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21658 ImplicationChecksByTransitivity, 13910.9ms TimeCoverageRelationStatistics Valid=26239, Invalid=54133, Unknown=0, NotChecked=0, Total=80372 [2021-05-06 11:46:47,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2021-05-06 11:46:47,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 202. [2021-05-06 11:46:47,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 197 states have (on average 1.0101522842639594) internal successors, (199), 197 states have internal predecessors, (199), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:46:47,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 203 transitions. [2021-05-06 11:46:47,692 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 203 transitions. Word has length 199 [2021-05-06 11:46:47,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:46:47,692 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 203 transitions. [2021-05-06 11:46:47,692 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 98 states, 98 states have (on average 1.989795918367347) internal successors, (195), 96 states have internal predecessors, (195), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:46:47,692 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 203 transitions. [2021-05-06 11:46:47,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2021-05-06 11:46:47,693 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:46:47,693 INFO L523 BasicCegarLoop]: trace histogram [92, 91, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:46:47,693 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92 [2021-05-06 11:46:47,693 INFO L428 AbstractCegarLoop]: === Iteration 94 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:46:47,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:46:47,693 INFO L82 PathProgramCache]: Analyzing trace with hash 1504969079, now seen corresponding path program 91 times [2021-05-06 11:46:47,693 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:46:47,693 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1557315354] [2021-05-06 11:46:47,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:46:47,697 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:46:47,697 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:47,698 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:47,701 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:46:47,705 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:46:47,725 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:46:47,741 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:46:47,742 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:46:47,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:51,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:46:51,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:51,287 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:46:51,288 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:46:51,288 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:46:51,350 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:46:51,469 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:46:51,469 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1557315354] [2021-05-06 11:46:51,469 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1557315354] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:46:51,469 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:46:51,469 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [99] imperfect sequences [] total 99 [2021-05-06 11:46:51,469 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441916955] [2021-05-06 11:46:51,470 INFO L460 AbstractCegarLoop]: Interpolant automaton has 99 states [2021-05-06 11:46:51,470 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:46:51,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2021-05-06 11:46:51,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4473, Invalid=5229, Unknown=0, NotChecked=0, Total=9702 [2021-05-06 11:46:51,471 INFO L87 Difference]: Start difference. First operand 202 states and 203 transitions. Second operand has 99 states, 99 states have (on average 1.9898989898989898) internal successors, (197), 97 states have internal predecessors, (197), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:47:09,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:47:09,640 INFO L93 Difference]: Finished difference Result 483 states and 575 transitions. [2021-05-06 11:47:09,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 191 states. [2021-05-06 11:47:09,640 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 99 states have (on average 1.9898989898989898) internal successors, (197), 97 states have internal predecessors, (197), 2 states have call successors, (3), 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 201 [2021-05-06 11:47:09,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:47:09,641 INFO L225 Difference]: With dead ends: 483 [2021-05-06 11:47:09,641 INFO L226 Difference]: Without dead ends: 477 [2021-05-06 11:47:09,644 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 285 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22126 ImplicationChecksByTransitivity, 14384.3ms TimeCoverageRelationStatistics Valid=26803, Invalid=55279, Unknown=0, NotChecked=0, Total=82082 [2021-05-06 11:47:09,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 477 states. [2021-05-06 11:47:09,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 477 to 204. [2021-05-06 11:47:09,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 199 states have (on average 1.0100502512562815) internal successors, (201), 199 states have internal predecessors, (201), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:47:09,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 205 transitions. [2021-05-06 11:47:09,718 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 205 transitions. Word has length 201 [2021-05-06 11:47:09,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:47:09,718 INFO L480 AbstractCegarLoop]: Abstraction has 204 states and 205 transitions. [2021-05-06 11:47:09,718 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 99 states, 99 states have (on average 1.9898989898989898) internal successors, (197), 97 states have internal predecessors, (197), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:47:09,719 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 205 transitions. [2021-05-06 11:47:09,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2021-05-06 11:47:09,719 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:47:09,719 INFO L523 BasicCegarLoop]: trace histogram [93, 92, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:47:09,719 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable93 [2021-05-06 11:47:09,719 INFO L428 AbstractCegarLoop]: === Iteration 95 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:47:09,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:47:09,720 INFO L82 PathProgramCache]: Analyzing trace with hash -1487189646, now seen corresponding path program 92 times [2021-05-06 11:47:09,720 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:47:09,720 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2072391303] [2021-05-06 11:47:09,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:47:09,743 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:47:09,744 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:09,744 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:09,748 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:47:09,751 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:47:09,771 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:47:09,785 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:47:09,786 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:47:09,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:13,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:47:13,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:13,437 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:47:13,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:47:13,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:47:13,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:47:13,608 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:47:13,608 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2072391303] [2021-05-06 11:47:13,608 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2072391303] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:47:13,608 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:47:13,608 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [100] imperfect sequences [] total 100 [2021-05-06 11:47:13,608 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930261176] [2021-05-06 11:47:13,609 INFO L460 AbstractCegarLoop]: Interpolant automaton has 100 states [2021-05-06 11:47:13,609 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:47:13,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2021-05-06 11:47:13,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4568, Invalid=5332, Unknown=0, NotChecked=0, Total=9900 [2021-05-06 11:47:13,610 INFO L87 Difference]: Start difference. First operand 204 states and 205 transitions. Second operand has 100 states, 100 states have (on average 1.99) internal successors, (199), 98 states have internal predecessors, (199), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:47:32,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:47:32,165 INFO L93 Difference]: Finished difference Result 488 states and 581 transitions. [2021-05-06 11:47:32,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 193 states. [2021-05-06 11:47:32,165 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 100 states have (on average 1.99) internal successors, (199), 98 states have internal predecessors, (199), 2 states have call successors, (3), 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 203 [2021-05-06 11:47:32,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:47:32,166 INFO L225 Difference]: With dead ends: 488 [2021-05-06 11:47:32,166 INFO L226 Difference]: Without dead ends: 482 [2021-05-06 11:47:32,169 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 387 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 288 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22599 ImplicationChecksByTransitivity, 14635.2ms TimeCoverageRelationStatistics Valid=27373, Invalid=56437, Unknown=0, NotChecked=0, Total=83810 [2021-05-06 11:47:32,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 482 states. [2021-05-06 11:47:32,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 482 to 206. [2021-05-06 11:47:32,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 201 states have (on average 1.0099502487562189) internal successors, (203), 201 states have internal predecessors, (203), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:47:32,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 207 transitions. [2021-05-06 11:47:32,240 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 207 transitions. Word has length 203 [2021-05-06 11:47:32,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:47:32,240 INFO L480 AbstractCegarLoop]: Abstraction has 206 states and 207 transitions. [2021-05-06 11:47:32,240 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 100 states, 100 states have (on average 1.99) internal successors, (199), 98 states have internal predecessors, (199), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:47:32,240 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 207 transitions. [2021-05-06 11:47:32,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2021-05-06 11:47:32,241 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:47:32,241 INFO L523 BasicCegarLoop]: trace histogram [94, 93, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:47:32,241 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable94 [2021-05-06 11:47:32,241 INFO L428 AbstractCegarLoop]: === Iteration 96 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:47:32,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:47:32,241 INFO L82 PathProgramCache]: Analyzing trace with hash 676363949, now seen corresponding path program 93 times [2021-05-06 11:47:32,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:47:32,241 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1142373566] [2021-05-06 11:47:32,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:47:32,245 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:47:32,245 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:32,246 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:32,249 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:47:32,253 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:47:32,274 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:47:32,289 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:47:32,290 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:47:32,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:35,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:47:35,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:35,979 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:47:35,980 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:47:35,980 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:47:36,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:47:36,147 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:47:36,148 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1142373566] [2021-05-06 11:47:36,148 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1142373566] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:47:36,148 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:47:36,148 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [101] imperfect sequences [] total 101 [2021-05-06 11:47:36,148 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083121318] [2021-05-06 11:47:36,148 INFO L460 AbstractCegarLoop]: Interpolant automaton has 101 states [2021-05-06 11:47:36,148 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:47:36,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2021-05-06 11:47:36,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4664, Invalid=5436, Unknown=0, NotChecked=0, Total=10100 [2021-05-06 11:47:36,149 INFO L87 Difference]: Start difference. First operand 206 states and 207 transitions. Second operand has 101 states, 101 states have (on average 1.99009900990099) internal successors, (201), 99 states have internal predecessors, (201), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:47:55,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:47:55,088 INFO L93 Difference]: Finished difference Result 493 states and 587 transitions. [2021-05-06 11:47:55,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 195 states. [2021-05-06 11:47:55,089 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 1.99009900990099) internal successors, (201), 99 states have internal predecessors, (201), 2 states have call successors, (3), 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 205 [2021-05-06 11:47:55,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:47:55,090 INFO L225 Difference]: With dead ends: 493 [2021-05-06 11:47:55,090 INFO L226 Difference]: Without dead ends: 487 [2021-05-06 11:47:55,093 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 291 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23077 ImplicationChecksByTransitivity, 14932.0ms TimeCoverageRelationStatistics Valid=27949, Invalid=57607, Unknown=0, NotChecked=0, Total=85556 [2021-05-06 11:47:55,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 487 states. [2021-05-06 11:47:55,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 487 to 208. [2021-05-06 11:47:55,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 203 states have (on average 1.0098522167487685) internal successors, (205), 203 states have internal predecessors, (205), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:47:55,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 209 transitions. [2021-05-06 11:47:55,164 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 209 transitions. Word has length 205 [2021-05-06 11:47:55,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:47:55,164 INFO L480 AbstractCegarLoop]: Abstraction has 208 states and 209 transitions. [2021-05-06 11:47:55,164 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 101 states, 101 states have (on average 1.99009900990099) internal successors, (201), 99 states have internal predecessors, (201), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:47:55,164 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 209 transitions. [2021-05-06 11:47:55,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2021-05-06 11:47:55,165 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:47:55,165 INFO L523 BasicCegarLoop]: trace histogram [95, 94, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:47:55,165 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95 [2021-05-06 11:47:55,165 INFO L428 AbstractCegarLoop]: === Iteration 97 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:47:55,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:47:55,165 INFO L82 PathProgramCache]: Analyzing trace with hash 1087197480, now seen corresponding path program 94 times [2021-05-06 11:47:55,165 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:47:55,165 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1485941216] [2021-05-06 11:47:55,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:47:55,169 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:47:55,170 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:55,170 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:55,173 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:47:55,177 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:47:55,197 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:47:55,212 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:47:55,213 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:47:55,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:58,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:47:58,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:58,994 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:47:58,995 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:47:58,996 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:47:59,043 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:47:59,170 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:47:59,170 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1485941216] [2021-05-06 11:47:59,170 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1485941216] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:47:59,170 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:47:59,170 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [102] imperfect sequences [] total 102 [2021-05-06 11:47:59,170 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828320902] [2021-05-06 11:47:59,171 INFO L460 AbstractCegarLoop]: Interpolant automaton has 102 states [2021-05-06 11:47:59,171 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:47:59,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2021-05-06 11:47:59,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4761, Invalid=5541, Unknown=0, NotChecked=0, Total=10302 [2021-05-06 11:47:59,172 INFO L87 Difference]: Start difference. First operand 208 states and 209 transitions. Second operand has 102 states, 102 states have (on average 1.9901960784313726) internal successors, (203), 100 states have internal predecessors, (203), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:48:18,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:48:18,698 INFO L93 Difference]: Finished difference Result 498 states and 593 transitions. [2021-05-06 11:48:18,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 197 states. [2021-05-06 11:48:18,698 INFO L78 Accepts]: Start accepts. Automaton has has 102 states, 102 states have (on average 1.9901960784313726) internal successors, (203), 100 states have internal predecessors, (203), 2 states have call successors, (3), 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 207 [2021-05-06 11:48:18,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:48:18,699 INFO L225 Difference]: With dead ends: 498 [2021-05-06 11:48:18,699 INFO L226 Difference]: Without dead ends: 492 [2021-05-06 11:48:18,702 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 294 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23560 ImplicationChecksByTransitivity, 15301.6ms TimeCoverageRelationStatistics Valid=28531, Invalid=58789, Unknown=0, NotChecked=0, Total=87320 [2021-05-06 11:48:18,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 492 states. [2021-05-06 11:48:18,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 492 to 210. [2021-05-06 11:48:18,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 205 states have (on average 1.0097560975609756) internal successors, (207), 205 states have internal predecessors, (207), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:48:18,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 211 transitions. [2021-05-06 11:48:18,773 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 211 transitions. Word has length 207 [2021-05-06 11:48:18,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:48:18,773 INFO L480 AbstractCegarLoop]: Abstraction has 210 states and 211 transitions. [2021-05-06 11:48:18,773 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 102 states, 102 states have (on average 1.9901960784313726) internal successors, (203), 100 states have internal predecessors, (203), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:48:18,773 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 211 transitions. [2021-05-06 11:48:18,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2021-05-06 11:48:18,774 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:48:18,774 INFO L523 BasicCegarLoop]: trace histogram [96, 95, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:48:18,774 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable96 [2021-05-06 11:48:18,774 INFO L428 AbstractCegarLoop]: === Iteration 98 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:48:18,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:48:18,774 INFO L82 PathProgramCache]: Analyzing trace with hash 761229539, now seen corresponding path program 95 times [2021-05-06 11:48:18,775 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:48:18,775 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [723710449] [2021-05-06 11:48:18,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:48:18,778 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:48:18,793 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:48:18,793 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:48:18,797 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:48:18,801 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:48:18,809 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:48:18,825 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:48:18,826 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:48:18,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:48:22,681 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:48:22,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:48:22,683 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:48:22,684 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:48:22,685 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:48:22,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:48:22,855 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:48:22,855 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [723710449] [2021-05-06 11:48:22,855 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [723710449] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:48:22,855 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:48:22,855 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [103] imperfect sequences [] total 103 [2021-05-06 11:48:22,855 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287013579] [2021-05-06 11:48:22,855 INFO L460 AbstractCegarLoop]: Interpolant automaton has 103 states [2021-05-06 11:48:22,855 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:48:22,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2021-05-06 11:48:22,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4859, Invalid=5647, Unknown=0, NotChecked=0, Total=10506 [2021-05-06 11:48:22,856 INFO L87 Difference]: Start difference. First operand 210 states and 211 transitions. Second operand has 103 states, 103 states have (on average 1.9902912621359223) internal successors, (205), 101 states have internal predecessors, (205), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:48:42,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:48:42,865 INFO L93 Difference]: Finished difference Result 503 states and 599 transitions. [2021-05-06 11:48:42,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 199 states. [2021-05-06 11:48:42,865 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 1.9902912621359223) internal successors, (205), 101 states have internal predecessors, (205), 2 states have call successors, (3), 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 209 [2021-05-06 11:48:42,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:48:42,867 INFO L225 Difference]: With dead ends: 503 [2021-05-06 11:48:42,867 INFO L226 Difference]: Without dead ends: 497 [2021-05-06 11:48:42,869 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 297 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24048 ImplicationChecksByTransitivity, 15549.9ms TimeCoverageRelationStatistics Valid=29119, Invalid=59983, Unknown=0, NotChecked=0, Total=89102 [2021-05-06 11:48:42,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 497 states. [2021-05-06 11:48:42,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 497 to 212. [2021-05-06 11:48:42,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 207 states have (on average 1.0096618357487923) internal successors, (209), 207 states have internal predecessors, (209), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:48:42,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 213 transitions. [2021-05-06 11:48:42,942 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 213 transitions. Word has length 209 [2021-05-06 11:48:42,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:48:42,943 INFO L480 AbstractCegarLoop]: Abstraction has 212 states and 213 transitions. [2021-05-06 11:48:42,943 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 103 states, 103 states have (on average 1.9902912621359223) internal successors, (205), 101 states have internal predecessors, (205), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:48:42,943 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 213 transitions. [2021-05-06 11:48:42,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 212 [2021-05-06 11:48:42,943 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:48:42,943 INFO L523 BasicCegarLoop]: trace histogram [97, 96, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:48:42,943 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable97 [2021-05-06 11:48:42,944 INFO L428 AbstractCegarLoop]: === Iteration 99 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:48:42,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:48:42,944 INFO L82 PathProgramCache]: Analyzing trace with hash 1038650846, now seen corresponding path program 96 times [2021-05-06 11:48:42,944 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:48:42,944 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1303992023] [2021-05-06 11:48:42,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:48:42,947 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:48:42,962 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:48:42,963 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:48:42,966 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:48:42,970 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:48:42,979 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:48:42,994 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:48:42,995 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:48:43,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:48:46,968 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:48:46,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:48:46,970 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:48:46,971 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:48:46,972 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:48:47,020 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:48:47,147 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:48:47,147 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1303992023] [2021-05-06 11:48:47,147 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1303992023] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:48:47,147 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:48:47,147 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [104] imperfect sequences [] total 104 [2021-05-06 11:48:47,148 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [557055808] [2021-05-06 11:48:47,148 INFO L460 AbstractCegarLoop]: Interpolant automaton has 104 states [2021-05-06 11:48:47,148 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:48:47,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2021-05-06 11:48:47,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4958, Invalid=5754, Unknown=0, NotChecked=0, Total=10712 [2021-05-06 11:48:47,149 INFO L87 Difference]: Start difference. First operand 212 states and 213 transitions. Second operand has 104 states, 104 states have (on average 1.9903846153846154) internal successors, (207), 102 states have internal predecessors, (207), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:49:07,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:49:07,739 INFO L93 Difference]: Finished difference Result 508 states and 605 transitions. [2021-05-06 11:49:07,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 201 states. [2021-05-06 11:49:07,740 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 104 states have (on average 1.9903846153846154) internal successors, (207), 102 states have internal predecessors, (207), 2 states have call successors, (3), 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 211 [2021-05-06 11:49:07,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:49:07,741 INFO L225 Difference]: With dead ends: 508 [2021-05-06 11:49:07,741 INFO L226 Difference]: Without dead ends: 502 [2021-05-06 11:49:07,744 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 300 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24541 ImplicationChecksByTransitivity, 15936.2ms TimeCoverageRelationStatistics Valid=29713, Invalid=61189, Unknown=0, NotChecked=0, Total=90902 [2021-05-06 11:49:07,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 502 states. [2021-05-06 11:49:07,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 502 to 214. [2021-05-06 11:49:07,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 209 states have (on average 1.0095693779904307) internal successors, (211), 209 states have internal predecessors, (211), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:49:07,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 215 transitions. [2021-05-06 11:49:07,819 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 215 transitions. Word has length 211 [2021-05-06 11:49:07,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:49:07,819 INFO L480 AbstractCegarLoop]: Abstraction has 214 states and 215 transitions. [2021-05-06 11:49:07,819 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 104 states, 104 states have (on average 1.9903846153846154) internal successors, (207), 102 states have internal predecessors, (207), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:49:07,819 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 215 transitions. [2021-05-06 11:49:07,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2021-05-06 11:49:07,822 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:49:07,823 INFO L523 BasicCegarLoop]: trace histogram [98, 97, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:49:07,823 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable98 [2021-05-06 11:49:07,823 INFO L428 AbstractCegarLoop]: === Iteration 100 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:49:07,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:49:07,823 INFO L82 PathProgramCache]: Analyzing trace with hash 1352554521, now seen corresponding path program 97 times [2021-05-06 11:49:07,823 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:49:07,823 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1262433909] [2021-05-06 11:49:07,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:49:07,829 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:49:07,829 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:49:07,830 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:49:07,833 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:49:07,837 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:49:07,857 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:49:07,872 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:49:07,873 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:49:07,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:49:11,895 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:49:11,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:49:11,899 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:49:11,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:49:11,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:49:11,947 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:49:12,076 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:49:12,076 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1262433909] [2021-05-06 11:49:12,076 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1262433909] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:49:12,077 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:49:12,077 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [105] imperfect sequences [] total 105 [2021-05-06 11:49:12,077 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161269037] [2021-05-06 11:49:12,077 INFO L460 AbstractCegarLoop]: Interpolant automaton has 105 states [2021-05-06 11:49:12,077 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:49:12,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2021-05-06 11:49:12,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5058, Invalid=5862, Unknown=0, NotChecked=0, Total=10920 [2021-05-06 11:49:12,078 INFO L87 Difference]: Start difference. First operand 214 states and 215 transitions. Second operand has 105 states, 105 states have (on average 1.9904761904761905) internal successors, (209), 103 states have internal predecessors, (209), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:49:33,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:49:33,090 INFO L93 Difference]: Finished difference Result 513 states and 611 transitions. [2021-05-06 11:49:33,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 203 states. [2021-05-06 11:49:33,090 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 105 states have (on average 1.9904761904761905) internal successors, (209), 103 states have internal predecessors, (209), 2 states have call successors, (3), 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 213 [2021-05-06 11:49:33,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:49:33,091 INFO L225 Difference]: With dead ends: 513 [2021-05-06 11:49:33,092 INFO L226 Difference]: Without dead ends: 507 [2021-05-06 11:49:33,094 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 407 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 303 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25039 ImplicationChecksByTransitivity, 16057.6ms TimeCoverageRelationStatistics Valid=30313, Invalid=62407, Unknown=0, NotChecked=0, Total=92720 [2021-05-06 11:49:33,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 507 states. [2021-05-06 11:49:33,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 507 to 216. [2021-05-06 11:49:33,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 211 states have (on average 1.009478672985782) internal successors, (213), 211 states have internal predecessors, (213), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:49:33,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 217 transitions. [2021-05-06 11:49:33,170 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 217 transitions. Word has length 213 [2021-05-06 11:49:33,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:49:33,170 INFO L480 AbstractCegarLoop]: Abstraction has 216 states and 217 transitions. [2021-05-06 11:49:33,170 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 105 states, 105 states have (on average 1.9904761904761905) internal successors, (209), 103 states have internal predecessors, (209), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:49:33,170 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 217 transitions. [2021-05-06 11:49:33,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2021-05-06 11:49:33,171 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:49:33,171 INFO L523 BasicCegarLoop]: trace histogram [99, 98, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:49:33,171 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable99 [2021-05-06 11:49:33,171 INFO L428 AbstractCegarLoop]: === Iteration 101 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:49:33,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:49:33,172 INFO L82 PathProgramCache]: Analyzing trace with hash -1928691820, now seen corresponding path program 98 times [2021-05-06 11:49:33,172 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:49:33,172 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [298575178] [2021-05-06 11:49:33,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:49:33,175 WARN L240 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size [2021-05-06 11:49:33,190 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:49:33,191 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:49:33,194 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 19 [2021-05-06 11:49:33,198 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:49:33,206 WARN L245 tifierPushTermWalker]: treesize reduction 5, result has 94.3 percent of original size 83 [2021-05-06 11:49:33,222 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:49:33,223 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:49:33,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:49:37,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:49:37,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:49:37,248 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:49:37,249 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:49:37,249 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:49:37,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:49:37,426 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:49:37,426 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [298575178] [2021-05-06 11:49:37,426 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [298575178] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:49:37,427 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:49:37,427 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [106] imperfect sequences [] total 106 [2021-05-06 11:49:37,427 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881189134] [2021-05-06 11:49:37,427 INFO L460 AbstractCegarLoop]: Interpolant automaton has 106 states [2021-05-06 11:49:37,427 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:49:37,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2021-05-06 11:49:37,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5159, Invalid=5971, Unknown=0, NotChecked=0, Total=11130 [2021-05-06 11:49:37,428 INFO L87 Difference]: Start difference. First operand 216 states and 217 transitions. Second operand has 106 states, 106 states have (on average 1.990566037735849) internal successors, (211), 104 states have internal predecessors, (211), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)