/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/watermelon.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 12:09:21,486 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 12:09:21,489 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 12:09:21,535 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 12:09:21,557 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 12:09:21,559 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 12:09:21,560 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 12:09:21,562 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 12:09:21,565 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 12:09:21,566 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 12:09:21,569 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 12:09:21,576 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 12:09:21,577 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 12:09:21,579 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 12:09:21,579 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 12:09:21,586 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 12:09:21,592 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 12:09:21,602 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 12:09:21,603 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 12:09:21,603 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 12:09:21,604 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 12:09:21,622 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 12:09:21,622 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 12:09:21,625 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 12:09:21,625 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 12:09:21,625 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 12:09:21,625 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 12:09:21,626 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 12:09:21,626 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 12:09:21,626 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 12:09:21,626 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 12:09:21,627 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 12:09:21,627 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 12:09:21,627 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 12:09:21,627 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 12:09:21,628 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 12:09:21,628 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 12:09:21,628 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 12:09:21,628 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 12:09:21,628 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 12:09:21,628 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 12:09:21,629 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 12:09:21,629 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 12:09:21,629 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 12:09:21,629 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 12:09:21,920 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 12:09:21,939 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 12:09:21,941 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 12:09:21,942 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 12:09:21,943 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 12:09:21,944 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/watermelon.c [2021-05-06 12:09:22,014 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/63f2fdc69/13d640757b83415d9833d5b27b8a2dbd/FLAGf92315157 [2021-05-06 12:09:22,462 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 12:09:22,462 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/watermelon.c [2021-05-06 12:09:22,469 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/63f2fdc69/13d640757b83415d9833d5b27b8a2dbd/FLAGf92315157 [2021-05-06 12:09:22,993 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/63f2fdc69/13d640757b83415d9833d5b27b8a2dbd [2021-05-06 12:09:22,995 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 12:09:22,996 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 12:09:23,000 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 12:09:23,001 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 12:09:23,004 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 12:09:23,005 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 12:09:22" (1/1) ... [2021-05-06 12:09:23,006 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4bc005c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:09:23, skipping insertion in model container [2021-05-06 12:09:23,006 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 12:09:22" (1/1) ... [2021-05-06 12:09:23,013 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 12:09:23,029 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 12:09:23,127 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/watermelon.c[373,386] [2021-05-06 12:09:23,141 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 12:09:23,149 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 12:09:23,159 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/watermelon.c[373,386] [2021-05-06 12:09:23,164 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 12:09:23,176 INFO L208 MainTranslator]: Completed translation [2021-05-06 12:09:23,176 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:09:23 WrapperNode [2021-05-06 12:09:23,177 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 12:09:23,177 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 12:09:23,178 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 12:09:23,178 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 12:09:23,219 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:09:23" (1/1) ... [2021-05-06 12:09:23,219 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:09:23" (1/1) ... [2021-05-06 12:09:23,236 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:09:23" (1/1) ... [2021-05-06 12:09:23,236 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:09:23" (1/1) ... [2021-05-06 12:09:23,252 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:09:23" (1/1) ... [2021-05-06 12:09:23,256 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:09:23" (1/1) ... [2021-05-06 12:09:23,257 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:09:23" (1/1) ... [2021-05-06 12:09:23,258 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 12:09:23,259 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 12:09:23,259 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 12:09:23,259 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 12:09:23,259 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:09:23" (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 12:09:23,339 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 12:09:23,339 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 12:09:23,339 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 12:09:23,340 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 12:09:23,340 INFO L138 BoogieDeclarations]: Found implementation of procedure correct_version [2021-05-06 12:09:23,340 INFO L138 BoogieDeclarations]: Found implementation of procedure student_version [2021-05-06 12:09:23,340 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 12:09:23,340 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 12:09:23,341 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 12:09:23,341 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 12:09:23,341 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 12:09:23,341 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-05-06 12:09:23,342 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 12:09:23,342 INFO L130 BoogieDeclarations]: Found specification of procedure correct_version [2021-05-06 12:09:23,342 INFO L130 BoogieDeclarations]: Found specification of procedure student_version [2021-05-06 12:09:23,342 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 12:09:23,342 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 12:09:23,343 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 12:09:23,343 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 12:09:23,345 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 12:09:23,345 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 12:09:23,345 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 12:09:23,666 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 12:09:23,667 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 12:09:23,668 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 12:09:23 BoogieIcfgContainer [2021-05-06 12:09:23,668 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 12:09:23,669 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 12:09:23,669 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 12:09:23,672 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 12:09:23,672 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 12:09:22" (1/3) ... [2021-05-06 12:09:23,673 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3522a45b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 12:09:23, skipping insertion in model container [2021-05-06 12:09:23,673 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:09:23" (2/3) ... [2021-05-06 12:09:23,673 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3522a45b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 12:09:23, skipping insertion in model container [2021-05-06 12:09:23,673 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 12:09:23" (3/3) ... [2021-05-06 12:09:23,675 INFO L111 eAbstractionObserver]: Analyzing ICFG watermelon.c [2021-05-06 12:09:23,680 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 12:09:23,683 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 12:09:23,698 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 12:09:23,717 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 12:09:23,717 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 12:09:23,717 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 12:09:23,717 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 12:09:23,717 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 12:09:23,717 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 12:09:23,717 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 12:09:23,718 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 12:09:23,730 INFO L276 IsEmpty]: Start isEmpty. Operand has 39 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 29 states have internal predecessors, (38), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 12:09:23,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-06 12:09:23,737 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:23,738 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:23,738 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:23,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:23,743 INFO L82 PathProgramCache]: Analyzing trace with hash 345664661, now seen corresponding path program 1 times [2021-05-06 12:09:23,750 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:23,750 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2092777110] [2021-05-06 12:09:23,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:23,801 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 12:09:23,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:24,050 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:24,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:24,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-06 12:09:24,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:24,096 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-05-06 12:09:24,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:24,131 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:24,133 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:24,133 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2092777110] [2021-05-06 12:09:24,134 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2092777110] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:24,135 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:24,135 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 12:09:24,135 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [887401740] [2021-05-06 12:09:24,139 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 12:09:24,139 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:24,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 12:09:24,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2021-05-06 12:09:24,153 INFO L87 Difference]: Start difference. First operand has 39 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 29 states have internal predecessors, (38), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 13 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 9 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:09:25,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:25,184 INFO L93 Difference]: Finished difference Result 91 states and 114 transitions. [2021-05-06 12:09:25,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 12:09:25,186 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 9 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 25 [2021-05-06 12:09:25,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:25,194 INFO L225 Difference]: With dead ends: 91 [2021-05-06 12:09:25,194 INFO L226 Difference]: Without dead ends: 42 [2021-05-06 12:09:25,198 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 596.6ms TimeCoverageRelationStatistics Valid=85, Invalid=515, Unknown=0, NotChecked=0, Total=600 [2021-05-06 12:09:25,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-06 12:09:25,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2021-05-06 12:09:25,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 28 states have (on average 1.2142857142857142) internal successors, (34), 30 states have internal predecessors, (34), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-06 12:09:25,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2021-05-06 12:09:25,242 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 25 [2021-05-06 12:09:25,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:25,242 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2021-05-06 12:09:25,242 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 9 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:09:25,243 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2021-05-06 12:09:25,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-06 12:09:25,244 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:25,244 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:25,245 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 12:09:25,245 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:25,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:25,246 INFO L82 PathProgramCache]: Analyzing trace with hash -1324779677, now seen corresponding path program 1 times [2021-05-06 12:09:25,246 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:25,246 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [959534828] [2021-05-06 12:09:25,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:25,257 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 12:09:25,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:25,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:25,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:25,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-06 12:09:25,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:25,356 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-05-06 12:09:25,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:25,369 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:25,370 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:25,370 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [959534828] [2021-05-06 12:09:25,370 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [959534828] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:25,370 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:25,370 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 12:09:25,370 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817169426] [2021-05-06 12:09:25,371 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 12:09:25,371 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:25,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 12:09:25,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 12:09:25,372 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-06 12:09:25,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:25,493 INFO L93 Difference]: Finished difference Result 55 states and 63 transitions. [2021-05-06 12:09:25,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 12:09:25,494 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 27 [2021-05-06 12:09:25,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:25,497 INFO L225 Difference]: With dead ends: 55 [2021-05-06 12:09:25,498 INFO L226 Difference]: Without dead ends: 42 [2021-05-06 12:09:25,500 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 51.9ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 12:09:25,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-06 12:09:25,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2021-05-06 12:09:25,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 29 states have (on average 1.206896551724138) internal successors, (35), 31 states have internal predecessors, (35), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-06 12:09:25,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 47 transitions. [2021-05-06 12:09:25,529 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 47 transitions. Word has length 27 [2021-05-06 12:09:25,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:25,529 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 47 transitions. [2021-05-06 12:09:25,529 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-06 12:09:25,529 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 47 transitions. [2021-05-06 12:09:25,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-06 12:09:25,537 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:25,537 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:25,538 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 12:09:25,538 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:25,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:25,538 INFO L82 PathProgramCache]: Analyzing trace with hash -855151641, now seen corresponding path program 1 times [2021-05-06 12:09:25,538 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:25,539 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1247861175] [2021-05-06 12:09:25,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:25,540 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 12:09:25,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:25,585 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:25,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:25,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-06 12:09:25,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:25,615 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-06 12:09:25,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:25,623 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:25,624 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:25,624 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1247861175] [2021-05-06 12:09:25,624 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1247861175] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:25,624 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:25,624 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 12:09:25,624 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569852050] [2021-05-06 12:09:25,625 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 12:09:25,625 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:25,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 12:09:25,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 12:09:25,626 INFO L87 Difference]: Start difference. First operand 41 states and 47 transitions. Second operand has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:09:25,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:25,752 INFO L93 Difference]: Finished difference Result 72 states and 83 transitions. [2021-05-06 12:09:25,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 12:09:25,753 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2021-05-06 12:09:25,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:25,754 INFO L225 Difference]: With dead ends: 72 [2021-05-06 12:09:25,754 INFO L226 Difference]: Without dead ends: 43 [2021-05-06 12:09:25,755 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 53.0ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 12:09:25,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-06 12:09:25,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2021-05-06 12:09:25,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.2) internal successors, (36), 32 states have internal predecessors, (36), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-06 12:09:25,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 48 transitions. [2021-05-06 12:09:25,776 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 48 transitions. Word has length 27 [2021-05-06 12:09:25,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:25,776 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 48 transitions. [2021-05-06 12:09:25,776 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:09:25,777 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 48 transitions. [2021-05-06 12:09:25,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-06 12:09:25,778 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:25,778 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:25,778 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 12:09:25,778 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:25,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:25,779 INFO L82 PathProgramCache]: Analyzing trace with hash 743790053, now seen corresponding path program 1 times [2021-05-06 12:09:25,779 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:25,780 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [543176232] [2021-05-06 12:09:25,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:25,834 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size [2021-05-06 12:09:25,864 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:25,882 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:09:25,898 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size 43 [2021-05-06 12:09:25,911 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:25,915 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:09:25,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:25,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:25,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:25,993 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-06 12:09:25,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:26,014 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-05-06 12:09:26,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:26,052 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:26,100 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:26,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:26,182 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:26,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:26,252 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:26,252 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [543176232] [2021-05-06 12:09:26,253 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [543176232] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:26,253 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:26,253 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 12:09:26,253 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567772501] [2021-05-06 12:09:26,254 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 12:09:26,254 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:26,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 12:09:26,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-06 12:09:26,262 INFO L87 Difference]: Start difference. First operand 42 states and 48 transitions. Second operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:09:26,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:26,633 INFO L93 Difference]: Finished difference Result 56 states and 62 transitions. [2021-05-06 12:09:26,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 12:09:26,634 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-05-06 12:09:26,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:26,635 INFO L225 Difference]: With dead ends: 56 [2021-05-06 12:09:26,635 INFO L226 Difference]: Without dead ends: 45 [2021-05-06 12:09:26,636 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 366.6ms TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2021-05-06 12:09:26,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-06 12:09:26,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2021-05-06 12:09:26,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 32 states have internal predecessors, (35), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-06 12:09:26,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2021-05-06 12:09:26,646 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 29 [2021-05-06 12:09:26,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:26,646 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2021-05-06 12:09:26,646 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:09:26,646 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2021-05-06 12:09:26,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-06 12:09:26,647 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:26,647 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:26,647 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 12:09:26,648 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:26,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:26,648 INFO L82 PathProgramCache]: Analyzing trace with hash 198429957, now seen corresponding path program 1 times [2021-05-06 12:09:26,648 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:26,648 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [182855177] [2021-05-06 12:09:26,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:26,660 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size [2021-05-06 12:09:26,668 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:26,674 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:09:26,686 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size 43 [2021-05-06 12:09:26,698 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:26,700 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:09:26,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:26,759 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:26,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:26,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-06 12:09:26,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:26,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-06 12:09:26,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:26,817 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 12:09:26,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:26,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:26,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:26,925 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:26,952 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:26,952 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [182855177] [2021-05-06 12:09:26,953 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [182855177] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:26,953 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:26,953 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 12:09:26,953 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315643484] [2021-05-06 12:09:26,953 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 12:09:26,953 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:26,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 12:09:26,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-06 12:09:26,957 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:09:27,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:27,277 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2021-05-06 12:09:27,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 12:09:27,277 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-05-06 12:09:27,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:27,279 INFO L225 Difference]: With dead ends: 51 [2021-05-06 12:09:27,279 INFO L226 Difference]: Without dead ends: 42 [2021-05-06 12:09:27,279 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 330.0ms TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2021-05-06 12:09:27,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-06 12:09:27,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-05-06 12:09:27,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 32 states have internal predecessors, (34), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-06 12:09:27,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2021-05-06 12:09:27,296 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 29 [2021-05-06 12:09:27,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:27,296 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2021-05-06 12:09:27,296 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:09:27,297 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2021-05-06 12:09:27,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-06 12:09:27,305 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:27,305 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:27,305 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-06 12:09:27,305 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:27,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:27,306 INFO L82 PathProgramCache]: Analyzing trace with hash 1589989783, now seen corresponding path program 1 times [2021-05-06 12:09:27,306 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:27,306 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [257902738] [2021-05-06 12:09:27,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:27,320 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size [2021-05-06 12:09:27,322 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:27,332 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:09:27,350 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size 43 [2021-05-06 12:09:27,361 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:27,367 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:09:27,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:27,431 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:27,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:27,439 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-06 12:09:27,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:27,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-06 12:09:27,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:27,466 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:27,483 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:27,504 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:27,505 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [257902738] [2021-05-06 12:09:27,505 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [257902738] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:27,505 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:27,505 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 12:09:27,505 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [816791434] [2021-05-06 12:09:27,505 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 12:09:27,505 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:27,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 12:09:27,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 12:09:27,506 INFO L87 Difference]: Start difference. First operand 42 states and 46 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-06 12:09:27,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:27,713 INFO L93 Difference]: Finished difference Result 58 states and 64 transitions. [2021-05-06 12:09:27,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 12:09:27,717 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 33 [2021-05-06 12:09:27,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:27,718 INFO L225 Difference]: With dead ends: 58 [2021-05-06 12:09:27,718 INFO L226 Difference]: Without dead ends: 45 [2021-05-06 12:09:27,718 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 140.7ms TimeCoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2021-05-06 12:09:27,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-06 12:09:27,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2021-05-06 12:09:27,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 32 states have (on average 1.125) internal successors, (36), 34 states have internal predecessors, (36), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-06 12:09:27,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2021-05-06 12:09:27,728 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 33 [2021-05-06 12:09:27,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:27,728 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2021-05-06 12:09:27,728 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-06 12:09:27,728 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2021-05-06 12:09:27,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-06 12:09:27,729 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:27,729 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:27,729 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-06 12:09:27,729 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:27,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:27,730 INFO L82 PathProgramCache]: Analyzing trace with hash 1518564121, now seen corresponding path program 2 times [2021-05-06 12:09:27,730 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:27,730 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [507866136] [2021-05-06 12:09:27,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:27,737 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size [2021-05-06 12:09:27,739 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:27,745 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:09:27,761 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size 43 [2021-05-06 12:09:27,773 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:27,777 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:09:27,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:27,841 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:27,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:27,846 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-06 12:09:27,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:27,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-06 12:09:27,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:28,003 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:09:28,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:30,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:30,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:32,687 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:32,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:32,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:33,000 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:33,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [507866136] [2021-05-06 12:09:33,001 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [507866136] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:33,001 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:33,001 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 12:09:33,001 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [583370302] [2021-05-06 12:09:33,002 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 12:09:33,002 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:33,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 12:09:33,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=391, Unknown=2, NotChecked=0, Total=462 [2021-05-06 12:09:33,003 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand has 20 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:09:35,432 WARN L205 SmtUtils]: Spent 2.11 s on a formula simplification that was a NOOP. DAG size: 68 [2021-05-06 12:09:46,186 WARN L205 SmtUtils]: Spent 6.37 s on a formula simplification. DAG size of input: 88 DAG size of output: 81 [2021-05-06 12:09:53,107 WARN L205 SmtUtils]: Spent 6.85 s on a formula simplification. DAG size of input: 80 DAG size of output: 69 [2021-05-06 12:09:59,576 WARN L205 SmtUtils]: Spent 6.39 s on a formula simplification. DAG size of input: 89 DAG size of output: 79 [2021-05-06 12:10:06,138 WARN L205 SmtUtils]: Spent 2.41 s on a formula simplification. DAG size of input: 79 DAG size of output: 74 [2021-05-06 12:10:08,716 WARN L205 SmtUtils]: Spent 2.40 s on a formula simplification. DAG size of input: 90 DAG size of output: 71 [2021-05-06 12:10:21,248 WARN L205 SmtUtils]: Spent 4.36 s on a formula simplification. DAG size of input: 80 DAG size of output: 72 [2021-05-06 12:10:21,427 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-06 12:10:21,845 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:10:22,043 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2021-05-06 12:10:22,262 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2021-05-06 12:10:22,444 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2021-05-06 12:10:22,676 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:10:23,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:23,073 INFO L93 Difference]: Finished difference Result 72 states and 85 transitions. [2021-05-06 12:10:23,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 12:10:23,074 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 35 [2021-05-06 12:10:23,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:23,075 INFO L225 Difference]: With dead ends: 72 [2021-05-06 12:10:23,075 INFO L226 Difference]: Without dead ends: 66 [2021-05-06 12:10:23,076 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 47805.6ms TimeCoverageRelationStatistics Valid=206, Invalid=1121, Unknown=5, NotChecked=0, Total=1332 [2021-05-06 12:10:23,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-06 12:10:23,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 60. [2021-05-06 12:10:23,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 45 states have (on average 1.2) internal successors, (54), 49 states have internal predecessors, (54), 7 states have call successors, (7), 5 states have call predecessors, (7), 7 states have return successors, (10), 5 states have call predecessors, (10), 5 states have call successors, (10) [2021-05-06 12:10:23,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 71 transitions. [2021-05-06 12:10:23,097 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 71 transitions. Word has length 35 [2021-05-06 12:10:23,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:23,097 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 71 transitions. [2021-05-06 12:10:23,098 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:10:23,098 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 71 transitions. [2021-05-06 12:10:23,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-06 12:10:23,100 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:23,100 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:23,100 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-06 12:10:23,100 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:23,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:23,101 INFO L82 PathProgramCache]: Analyzing trace with hash 1057360469, now seen corresponding path program 1 times [2021-05-06 12:10:23,101 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:23,101 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1249569818] [2021-05-06 12:10:23,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:23,116 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size [2021-05-06 12:10:23,118 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:23,140 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:10:23,197 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size 43 [2021-05-06 12:10:23,260 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:23,261 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:10:23,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:23,459 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:10:23,460 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:23,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:23,466 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-06 12:10:23,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:23,469 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-06 12:10:23,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:23,615 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:23,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:23,725 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:23,725 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1249569818] [2021-05-06 12:10:23,725 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1249569818] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:23,725 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:23,725 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 12:10:23,725 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [223924225] [2021-05-06 12:10:23,725 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 12:10:23,725 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:23,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 12:10:23,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-06 12:10:23,726 INFO L87 Difference]: Start difference. First operand 60 states and 71 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-06 12:10:24,600 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2021-05-06 12:10:24,742 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2021-05-06 12:10:24,889 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2021-05-06 12:10:25,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:25,089 INFO L93 Difference]: Finished difference Result 69 states and 79 transitions. [2021-05-06 12:10:25,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 12:10:25,090 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 35 [2021-05-06 12:10:25,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:25,090 INFO L225 Difference]: With dead ends: 69 [2021-05-06 12:10:25,091 INFO L226 Difference]: Without dead ends: 60 [2021-05-06 12:10:25,091 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1141.7ms TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2021-05-06 12:10:25,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-06 12:10:25,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-05-06 12:10:25,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 45 states have (on average 1.1777777777777778) internal successors, (53), 49 states have internal predecessors, (53), 7 states have call successors, (7), 5 states have call predecessors, (7), 7 states have return successors, (10), 5 states have call predecessors, (10), 5 states have call successors, (10) [2021-05-06 12:10:25,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 70 transitions. [2021-05-06 12:10:25,106 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 70 transitions. Word has length 35 [2021-05-06 12:10:25,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:25,106 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 70 transitions. [2021-05-06 12:10:25,107 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-06 12:10:25,107 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 70 transitions. [2021-05-06 12:10:25,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-06 12:10:25,107 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:25,107 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:25,107 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-06 12:10:25,108 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:25,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:25,108 INFO L82 PathProgramCache]: Analyzing trace with hash 1737418839, now seen corresponding path program 1 times [2021-05-06 12:10:25,108 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:25,108 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1563655490] [2021-05-06 12:10:25,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:25,124 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size [2021-05-06 12:10:25,125 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:25,144 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:10:25,257 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size 43 [2021-05-06 12:10:25,336 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:25,337 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:10:25,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:25,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:25,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:25,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-06 12:10:25,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:26,055 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-06 12:10:26,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:26,263 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:26,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:26,544 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:26,544 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1563655490] [2021-05-06 12:10:26,545 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1563655490] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:26,545 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:26,545 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 12:10:26,545 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146187388] [2021-05-06 12:10:26,545 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 12:10:26,545 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:26,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 12:10:26,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-05-06 12:10:26,546 INFO L87 Difference]: Start difference. First operand 60 states and 70 transitions. Second operand has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:10:26,798 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-06 12:10:27,041 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:10:27,245 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2021-05-06 12:10:27,510 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-06 12:10:27,878 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-06 12:10:28,194 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-06 12:10:28,515 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-06 12:10:28,927 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:10:29,236 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-06 12:10:29,454 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2021-05-06 12:10:29,698 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:10:29,852 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:10:29,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:29,947 INFO L93 Difference]: Finished difference Result 68 states and 77 transitions. [2021-05-06 12:10:29,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 12:10:29,947 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 35 [2021-05-06 12:10:29,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:29,948 INFO L225 Difference]: With dead ends: 68 [2021-05-06 12:10:29,948 INFO L226 Difference]: Without dead ends: 58 [2021-05-06 12:10:29,949 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 3054.3ms TimeCoverageRelationStatistics Valid=102, Invalid=600, Unknown=0, NotChecked=0, Total=702 [2021-05-06 12:10:29,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-06 12:10:29,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 46. [2021-05-06 12:10:29,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 36 states have internal predecessors, (38), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-06 12:10:29,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2021-05-06 12:10:29,960 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 35 [2021-05-06 12:10:29,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:29,960 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2021-05-06 12:10:29,960 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:10:29,960 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2021-05-06 12:10:29,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 12:10:29,961 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:29,961 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:29,961 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-06 12:10:29,961 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:29,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:29,961 INFO L82 PathProgramCache]: Analyzing trace with hash 1597979675, now seen corresponding path program 3 times [2021-05-06 12:10:29,962 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:29,962 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1808589609] [2021-05-06 12:10:29,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:29,975 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size [2021-05-06 12:10:30,004 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:30,026 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:10:30,068 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size 43 [2021-05-06 12:10:30,130 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:30,134 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:10:30,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:30,368 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:30,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:30,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-06 12:10:30,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:30,780 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 14 [2021-05-06 12:10:30,834 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-06 12:10:30,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:31,400 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:10:31,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:33,457 WARN L205 SmtUtils]: Spent 2.04 s on a formula simplification that was a NOOP. DAG size: 33 [2021-05-06 12:10:39,652 WARN L205 SmtUtils]: Spent 2.04 s on a formula simplification that was a NOOP. DAG size: 33 [2021-05-06 12:10:39,654 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:42,060 WARN L205 SmtUtils]: Spent 2.30 s on a formula simplification that was a NOOP. DAG size: 34 [2021-05-06 12:10:42,063 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:46,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:46,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:46,964 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:47,147 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:47,147 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1808589609] [2021-05-06 12:10:47,147 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1808589609] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:47,147 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:47,147 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 12:10:47,147 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111723627] [2021-05-06 12:10:47,148 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 12:10:47,148 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:47,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 12:10:47,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=436, Unknown=3, NotChecked=0, Total=506 [2021-05-06 12:10:47,149 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand has 21 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 19 states have internal predecessors, (29), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:10:49,489 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:10:53,916 WARN L205 SmtUtils]: Spent 2.16 s on a formula simplification that was a NOOP. DAG size: 70 [2021-05-06 12:11:04,390 WARN L205 SmtUtils]: Spent 2.19 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-06 12:11:11,108 WARN L205 SmtUtils]: Spent 2.44 s on a formula simplification. DAG size of input: 80 DAG size of output: 77 [2021-05-06 12:11:21,873 WARN L205 SmtUtils]: Spent 4.58 s on a formula simplification. DAG size of input: 84 DAG size of output: 81 [2021-05-06 12:11:47,029 WARN L205 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2021-05-06 12:11:49,258 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-06 12:11:57,849 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:11:58,076 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:11:58,348 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:11:58,649 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:11:58,919 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:11:59,145 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-06 12:11:59,638 WARN L205 SmtUtils]: Spent 310.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 46 [2021-05-06 12:12:00,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:00,218 INFO L93 Difference]: Finished difference Result 76 states and 84 transitions. [2021-05-06 12:12:00,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 12:12:00,219 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 19 states have internal predecessors, (29), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 37 [2021-05-06 12:12:00,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:00,220 INFO L225 Difference]: With dead ends: 76 [2021-05-06 12:12:00,220 INFO L226 Difference]: Without dead ends: 70 [2021-05-06 12:12:00,220 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 328 ImplicationChecksByTransitivity, 38825.6ms TimeCoverageRelationStatistics Valid=164, Invalid=1160, Unknown=8, NotChecked=0, Total=1332 [2021-05-06 12:12:00,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-05-06 12:12:00,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 60. [2021-05-06 12:12:00,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 45 states have (on average 1.1777777777777778) internal successors, (53), 49 states have internal predecessors, (53), 7 states have call successors, (7), 5 states have call predecessors, (7), 7 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-05-06 12:12:00,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 68 transitions. [2021-05-06 12:12:00,235 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 68 transitions. Word has length 37 [2021-05-06 12:12:00,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:00,235 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 68 transitions. [2021-05-06 12:12:00,235 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 19 states have internal predecessors, (29), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:12:00,236 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 68 transitions. [2021-05-06 12:12:00,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 12:12:00,236 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:00,236 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:00,236 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-06 12:12:00,237 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:00,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:00,237 INFO L82 PathProgramCache]: Analyzing trace with hash 783907799, now seen corresponding path program 2 times [2021-05-06 12:12:00,237 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:00,237 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [186663853] [2021-05-06 12:12:00,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:00,258 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size [2021-05-06 12:12:00,259 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:00,284 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:12:00,342 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size 43 [2021-05-06 12:12:00,414 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:00,415 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:12:00,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:00,565 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 21 [2021-05-06 12:12:00,697 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:12:00,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:00,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:00,700 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-06 12:12:00,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:01,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-06 12:12:01,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:02,060 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:12:02,061 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:02,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:02,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:04,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:04,917 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:05,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:05,299 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:05,299 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [186663853] [2021-05-06 12:12:05,300 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [186663853] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:05,300 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:05,300 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 12:12:05,300 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111504703] [2021-05-06 12:12:05,300 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 12:12:05,300 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:05,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 12:12:05,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=477, Unknown=1, NotChecked=0, Total=552 [2021-05-06 12:12:05,301 INFO L87 Difference]: Start difference. First operand 60 states and 68 transitions. Second operand has 22 states, 20 states have (on average 1.45) internal successors, (29), 20 states have internal predecessors, (29), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:12:05,761 WARN L205 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:12:08,060 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-06 12:12:12,510 WARN L205 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-06 12:12:12,958 WARN L205 SmtUtils]: Spent 359.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 72 [2021-05-06 12:12:17,483 WARN L205 SmtUtils]: Spent 2.41 s on a formula simplification. DAG size of input: 77 DAG size of output: 66 [2021-05-06 12:12:18,207 WARN L205 SmtUtils]: Spent 597.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 75 [2021-05-06 12:12:18,769 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 12:12:19,096 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:12:19,385 WARN L205 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:12:19,715 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2021-05-06 12:12:20,020 WARN L205 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2021-05-06 12:12:20,403 WARN L205 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 54 [2021-05-06 12:12:20,658 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-06 12:12:21,067 WARN L205 SmtUtils]: Spent 322.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 62 [2021-05-06 12:12:21,543 WARN L205 SmtUtils]: Spent 345.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 68 [2021-05-06 12:12:21,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:21,933 INFO L93 Difference]: Finished difference Result 66 states and 73 transitions. [2021-05-06 12:12:21,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 12:12:21,933 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 20 states have (on average 1.45) internal successors, (29), 20 states have internal predecessors, (29), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 37 [2021-05-06 12:12:21,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:21,934 INFO L225 Difference]: With dead ends: 66 [2021-05-06 12:12:21,934 INFO L226 Difference]: Without dead ends: 52 [2021-05-06 12:12:21,935 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 372 ImplicationChecksByTransitivity, 17321.6ms TimeCoverageRelationStatistics Valid=203, Invalid=1275, Unknown=4, NotChecked=0, Total=1482 [2021-05-06 12:12:21,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-06 12:12:21,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-05-06 12:12:21,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 40 states have (on average 1.1) internal successors, (44), 42 states have internal predecessors, (44), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-06 12:12:21,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2021-05-06 12:12:21,956 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 37 [2021-05-06 12:12:21,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:21,956 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2021-05-06 12:12:21,956 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 20 states have (on average 1.45) internal successors, (29), 20 states have internal predecessors, (29), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:12:21,956 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2021-05-06 12:12:21,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-06 12:12:21,957 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:21,957 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:21,957 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-05-06 12:12:21,957 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:21,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:21,958 INFO L82 PathProgramCache]: Analyzing trace with hash 606915741, now seen corresponding path program 4 times [2021-05-06 12:12:21,958 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:21,958 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [346225913] [2021-05-06 12:12:21,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:21,975 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size [2021-05-06 12:12:21,976 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:22,000 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:12:22,070 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size 43 [2021-05-06 12:12:22,161 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:22,163 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:12:22,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:22,349 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 22 [2021-05-06 12:12:22,484 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:12:22,484 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:22,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:22,491 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-06 12:12:22,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:22,923 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2021-05-06 12:12:23,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-06 12:12:23,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:23,834 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:12:23,836 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:26,038 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:26,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:28,862 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:29,035 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:29,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:29,425 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:12:29,425 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [346225913] [2021-05-06 12:12:29,425 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [346225913] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:12:29,426 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:12:29,426 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 12:12:29,426 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525468897] [2021-05-06 12:12:29,426 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 12:12:29,426 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:12:29,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 12:12:29,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=479, Unknown=2, NotChecked=0, Total=552 [2021-05-06 12:12:29,427 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand has 22 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:12:29,737 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:12:32,198 WARN L205 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-06 12:12:36,662 WARN L205 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-06 12:12:37,193 WARN L205 SmtUtils]: Spent 441.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 68 [2021-05-06 12:12:41,743 WARN L205 SmtUtils]: Spent 2.36 s on a formula simplification. DAG size of input: 77 DAG size of output: 66 [2021-05-06 12:12:44,270 WARN L205 SmtUtils]: Spent 2.43 s on a formula simplification. DAG size of input: 84 DAG size of output: 73 [2021-05-06 12:12:44,584 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-06 12:12:44,848 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:12:45,092 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:12:45,382 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:12:45,689 WARN L205 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:12:45,983 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:12:46,360 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:12:46,633 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-06 12:12:47,126 WARN L205 SmtUtils]: Spent 306.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 46 [2021-05-06 12:12:47,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:12:47,436 INFO L93 Difference]: Finished difference Result 65 states and 70 transitions. [2021-05-06 12:12:47,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 12:12:47,436 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 39 [2021-05-06 12:12:47,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:12:47,437 INFO L225 Difference]: With dead ends: 65 [2021-05-06 12:12:47,437 INFO L226 Difference]: Without dead ends: 55 [2021-05-06 12:12:47,438 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 363 ImplicationChecksByTransitivity, 21358.0ms TimeCoverageRelationStatistics Valid=180, Invalid=1297, Unknown=5, NotChecked=0, Total=1482 [2021-05-06 12:12:47,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-06 12:12:47,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2021-05-06 12:12:47,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 42 states have (on average 1.0952380952380953) internal successors, (46), 44 states have internal predecessors, (46), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-06 12:12:47,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2021-05-06 12:12:47,464 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 39 [2021-05-06 12:12:47,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:12:47,464 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2021-05-06 12:12:47,464 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:12:47,464 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2021-05-06 12:12:47,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-06 12:12:47,465 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:12:47,465 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:12:47,465 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-06 12:12:47,465 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:12:47,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:12:47,466 INFO L82 PathProgramCache]: Analyzing trace with hash -1449963591, now seen corresponding path program 5 times [2021-05-06 12:12:47,466 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:12:47,466 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1141113062] [2021-05-06 12:12:47,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:12:47,485 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size [2021-05-06 12:12:47,511 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:47,531 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:12:47,568 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size 43 [2021-05-06 12:12:47,641 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:47,650 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:12:47,656 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 88.9 percent of original size [2021-05-06 12:12:47,686 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:12:47,710 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 18 [2021-05-06 12:12:47,750 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 88.9 percent of original size 48 [2021-05-06 12:12:47,826 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:12:47,835 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:12:47,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:48,022 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 22 [2021-05-06 12:12:48,180 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:12:48,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:12:48,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:48,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-06 12:12:48,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:48,617 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2021-05-06 12:12:48,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-06 12:12:48,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:12:49,417 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:12:49,418 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:51,635 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:51,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:54,069 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:12:56,301 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:13:02,733 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:13:02,907 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:13:03,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:13:03,296 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:13:03,296 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1141113062] [2021-05-06 12:13:03,296 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1141113062] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:13:03,296 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:13:03,296 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 12:13:03,296 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1766453894] [2021-05-06 12:13:03,297 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 12:13:03,297 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:13:03,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 12:13:03,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=513, Unknown=6, NotChecked=0, Total=600 [2021-05-06 12:13:03,297 INFO L87 Difference]: Start difference. First operand 54 states and 58 transitions. Second operand has 23 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 21 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:13:03,593 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:13:09,927 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-06 12:13:22,424 WARN L205 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-06 12:13:26,929 WARN L205 SmtUtils]: Spent 375.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 68 [2021-05-06 12:13:33,260 WARN L205 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-06 12:13:37,816 WARN L205 SmtUtils]: Spent 438.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 73 [2021-05-06 12:13:46,314 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-06 12:13:52,892 WARN L205 SmtUtils]: Spent 371.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 69 [2021-05-06 12:13:59,471 WARN L205 SmtUtils]: Spent 2.44 s on a formula simplification. DAG size of input: 80 DAG size of output: 67 [2021-05-06 12:14:04,117 WARN L205 SmtUtils]: Spent 407.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 74 [2021-05-06 12:14:04,374 WARN L205 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-06 12:14:04,675 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:14:04,887 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:14:05,146 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:14:05,401 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:14:05,658 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:14:05,895 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-06 12:14:06,333 WARN L205 SmtUtils]: Spent 315.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 46 [2021-05-06 12:14:06,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:14:06,625 INFO L93 Difference]: Finished difference Result 61 states and 64 transitions. [2021-05-06 12:14:06,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 12:14:06,625 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 21 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 39 [2021-05-06 12:14:06,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:14:06,626 INFO L225 Difference]: With dead ends: 61 [2021-05-06 12:14:06,626 INFO L226 Difference]: Without dead ends: 51 [2021-05-06 12:14:06,627 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 449 ImplicationChecksByTransitivity, 58910.8ms TimeCoverageRelationStatistics Valid=239, Invalid=1543, Unknown=24, NotChecked=0, Total=1806 [2021-05-06 12:14:06,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-06 12:14:06,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 42. [2021-05-06 12:14:06,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 33 states have internal predecessors, (35), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 12:14:06,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2021-05-06 12:14:06,638 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 39 [2021-05-06 12:14:06,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:14:06,638 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2021-05-06 12:14:06,638 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 21 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:14:06,638 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2021-05-06 12:14:06,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-06 12:14:06,638 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:14:06,638 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:14:06,638 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-05-06 12:14:06,639 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:14:06,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:14:06,639 INFO L82 PathProgramCache]: Analyzing trace with hash 1677214879, now seen corresponding path program 6 times [2021-05-06 12:14:06,639 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:14:06,639 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [164656472] [2021-05-06 12:14:06,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:14:06,651 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size [2021-05-06 12:14:06,652 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:14:06,673 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:14:06,733 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size 43 [2021-05-06 12:14:06,815 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:14:06,816 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:14:06,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:06,949 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2021-05-06 12:14:07,100 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:14:07,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:14:07,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:07,113 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-06 12:14:07,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:07,587 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 14 [2021-05-06 12:14:07,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-06 12:14:07,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:14:08,657 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:14:08,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:14:10,696 WARN L205 SmtUtils]: Spent 2.04 s on a formula simplification that was a NOOP. DAG size: 34 [2021-05-06 12:14:16,933 WARN L205 SmtUtils]: Spent 2.05 s on a formula simplification that was a NOOP. DAG size: 34 [2021-05-06 12:14:16,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:14:19,105 WARN L205 SmtUtils]: Spent 2.05 s on a formula simplification that was a NOOP. DAG size: 35 [2021-05-06 12:14:19,107 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:14:25,523 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:14:25,694 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:14:25,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:14:26,077 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:14:26,077 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [164656472] [2021-05-06 12:14:26,078 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [164656472] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:14:26,078 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:14:26,078 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 12:14:26,078 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814991981] [2021-05-06 12:14:26,078 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 12:14:26,078 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:14:26,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 12:14:26,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=523, Unknown=4, NotChecked=0, Total=600 [2021-05-06 12:14:26,079 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand has 23 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:14:28,451 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:14:30,809 WARN L205 SmtUtils]: Spent 194.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2021-05-06 12:14:41,602 WARN L205 SmtUtils]: Spent 2.43 s on a formula simplification that was a NOOP. DAG size: 73 [2021-05-06 12:14:48,469 WARN L205 SmtUtils]: Spent 2.50 s on a formula simplification. DAG size of input: 81 DAG size of output: 78 [2021-05-06 12:14:59,286 WARN L205 SmtUtils]: Spent 4.62 s on a formula simplification. DAG size of input: 85 DAG size of output: 82 [2021-05-06 12:15:13,911 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-06 12:15:14,284 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:15:14,565 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:15:14,879 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:15:15,229 WARN L205 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:15:15,568 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:15:15,889 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:15:16,259 WARN L205 SmtUtils]: Spent 183.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:15:16,571 WARN L205 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-06 12:15:17,172 WARN L205 SmtUtils]: Spent 397.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 46 [2021-05-06 12:15:17,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:15:17,723 INFO L93 Difference]: Finished difference Result 66 states and 70 transitions. [2021-05-06 12:15:17,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 12:15:17,724 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 41 [2021-05-06 12:15:17,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:15:17,724 INFO L225 Difference]: With dead ends: 66 [2021-05-06 12:15:17,724 INFO L226 Difference]: Without dead ends: 60 [2021-05-06 12:15:17,725 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 384 ImplicationChecksByTransitivity, 40030.5ms TimeCoverageRelationStatistics Valid=174, Invalid=1377, Unknown=9, NotChecked=0, Total=1560 [2021-05-06 12:15:17,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-06 12:15:17,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 56. [2021-05-06 12:15:17,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 44 states have (on average 1.0909090909090908) internal successors, (48), 46 states have internal predecessors, (48), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-06 12:15:17,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2021-05-06 12:15:17,742 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 41 [2021-05-06 12:15:17,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:15:17,742 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2021-05-06 12:15:17,742 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:15:17,742 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2021-05-06 12:15:17,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 12:15:17,743 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:15:17,743 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:15:17,743 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-06 12:15:17,743 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:15:17,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:15:17,743 INFO L82 PathProgramCache]: Analyzing trace with hash -557464543, now seen corresponding path program 7 times [2021-05-06 12:15:17,743 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:15:17,743 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [273262836] [2021-05-06 12:15:17,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:15:17,757 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size [2021-05-06 12:15:17,758 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:15:17,779 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:15:17,849 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size 43 [2021-05-06 12:15:17,924 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:15:17,925 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:15:17,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:18,180 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:15:18,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:15:18,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:18,184 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-06 12:15:18,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:18,514 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 10 [2021-05-06 12:15:18,706 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 14 [2021-05-06 12:15:18,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-06 12:15:18,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:15:20,098 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:15:20,100 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:15:22,152 WARN L205 SmtUtils]: Spent 2.04 s on a formula simplification that was a NOOP. DAG size: 34 [2021-05-06 12:15:28,369 WARN L205 SmtUtils]: Spent 2.06 s on a formula simplification that was a NOOP. DAG size: 34 [2021-05-06 12:15:28,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:15:30,611 WARN L205 SmtUtils]: Spent 2.08 s on a formula simplification that was a NOOP. DAG size: 35 [2021-05-06 12:15:30,613 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:15:35,008 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:15:35,183 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:15:35,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:15:35,658 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 10 [2021-05-06 12:15:35,659 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:15:35,659 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [273262836] [2021-05-06 12:15:35,659 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [273262836] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:15:35,659 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:15:35,659 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 12:15:35,659 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584289071] [2021-05-06 12:15:35,660 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 12:15:35,660 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:15:35,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 12:15:35,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=571, Unknown=3, NotChecked=0, Total=650 [2021-05-06 12:15:35,660 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand has 24 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 22 states have internal predecessors, (35), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:15:38,181 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:15:44,950 WARN L205 SmtUtils]: Spent 2.19 s on a formula simplification that was a NOOP. DAG size: 71 [2021-05-06 12:15:55,879 WARN L205 SmtUtils]: Spent 2.18 s on a formula simplification that was a NOOP. DAG size: 73 [2021-05-06 12:16:03,126 WARN L205 SmtUtils]: Spent 2.56 s on a formula simplification. DAG size of input: 81 DAG size of output: 78 [2021-05-06 12:16:14,703 WARN L205 SmtUtils]: Spent 4.87 s on a formula simplification. DAG size of input: 85 DAG size of output: 82 [2021-05-06 12:16:33,421 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-06 12:16:37,862 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:16:38,161 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:16:38,477 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:16:38,791 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:16:39,112 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:16:39,427 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:16:39,748 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:16:40,218 WARN L205 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:16:40,530 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-06 12:16:41,132 WARN L205 SmtUtils]: Spent 341.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 46 [2021-05-06 12:16:41,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:16:41,781 INFO L93 Difference]: Finished difference Result 72 states and 77 transitions. [2021-05-06 12:16:41,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 12:16:41,782 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 22 states have internal predecessors, (35), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 43 [2021-05-06 12:16:41,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:16:41,782 INFO L225 Difference]: With dead ends: 72 [2021-05-06 12:16:41,783 INFO L226 Difference]: Without dead ends: 66 [2021-05-06 12:16:41,783 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 426 ImplicationChecksByTransitivity, 41292.5ms TimeCoverageRelationStatistics Valid=183, Invalid=1531, Unknown=8, NotChecked=0, Total=1722 [2021-05-06 12:16:41,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-06 12:16:41,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 58. [2021-05-06 12:16:41,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 46 states have (on average 1.108695652173913) internal successors, (51), 48 states have internal predecessors, (51), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-06 12:16:41,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 63 transitions. [2021-05-06 12:16:41,805 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 63 transitions. Word has length 43 [2021-05-06 12:16:41,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:16:41,805 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 63 transitions. [2021-05-06 12:16:41,805 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 22 states have internal predecessors, (35), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:16:41,805 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 63 transitions. [2021-05-06 12:16:41,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 12:16:41,806 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:16:41,806 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:16:41,806 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-06 12:16:41,806 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:16:41,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:16:41,806 INFO L82 PathProgramCache]: Analyzing trace with hash 2025675069, now seen corresponding path program 8 times [2021-05-06 12:16:41,806 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:16:41,806 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2041800379] [2021-05-06 12:16:41,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:16:41,823 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size [2021-05-06 12:16:41,824 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:41,845 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:16:41,904 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size 43 [2021-05-06 12:16:41,981 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:41,982 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:16:41,985 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 88.9 percent of original size [2021-05-06 12:16:42,010 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:16:42,033 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 18 [2021-05-06 12:16:42,065 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 88.9 percent of original size 48 [2021-05-06 12:16:42,142 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:16:42,143 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:16:42,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:42,287 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 22 [2021-05-06 12:16:42,412 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:16:42,412 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:16:42,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:42,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-06 12:16:42,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:42,854 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2021-05-06 12:16:42,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-06 12:16:42,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:16:43,944 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:16:43,945 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:16:44,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:16:44,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:16:46,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:16:48,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:16:55,470 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:16:55,687 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:16:55,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:16:56,107 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:16:56,108 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2041800379] [2021-05-06 12:16:56,108 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2041800379] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:16:56,108 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:16:56,108 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 12:16:56,108 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237549806] [2021-05-06 12:16:56,108 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 12:16:56,108 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:16:56,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 12:16:56,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=610, Unknown=5, NotChecked=0, Total=702 [2021-05-06 12:16:56,109 INFO L87 Difference]: Start difference. First operand 58 states and 63 transitions. Second operand has 25 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 23 states have internal predecessors, (35), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:16:56,450 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:17:02,775 WARN L205 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-06 12:17:11,206 WARN L205 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-06 12:17:15,711 WARN L205 SmtUtils]: Spent 388.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 68 [2021-05-06 12:17:22,172 WARN L205 SmtUtils]: Spent 191.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-06 12:17:26,775 WARN L205 SmtUtils]: Spent 471.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 73 [2021-05-06 12:17:37,172 WARN L205 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-06 12:17:43,786 WARN L205 SmtUtils]: Spent 410.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 69 [2021-05-06 12:17:50,350 WARN L205 SmtUtils]: Spent 2.40 s on a formula simplification. DAG size of input: 80 DAG size of output: 67 [2021-05-06 12:17:55,128 WARN L205 SmtUtils]: Spent 525.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 74 [2021-05-06 12:17:55,433 WARN L205 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-06 12:17:55,807 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:17:56,052 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:17:56,359 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:17:56,665 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:17:56,969 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:17:57,294 WARN L205 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:17:57,633 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:17:57,886 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-06 12:17:58,418 WARN L205 SmtUtils]: Spent 326.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 46 [2021-05-06 12:17:58,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:17:58,804 INFO L93 Difference]: Finished difference Result 69 states and 73 transitions. [2021-05-06 12:17:58,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 12:17:58,804 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 23 states have internal predecessors, (35), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 43 [2021-05-06 12:17:58,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:17:58,805 INFO L225 Difference]: With dead ends: 69 [2021-05-06 12:17:58,805 INFO L226 Difference]: Without dead ends: 59 [2021-05-06 12:17:58,805 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 558 ImplicationChecksByTransitivity, 60271.0ms TimeCoverageRelationStatistics Valid=257, Invalid=1881, Unknown=24, NotChecked=0, Total=2162 [2021-05-06 12:17:58,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-06 12:17:58,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2021-05-06 12:17:58,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 46 states have (on average 1.0869565217391304) internal successors, (50), 48 states have internal predecessors, (50), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-06 12:17:58,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 62 transitions. [2021-05-06 12:17:58,827 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 62 transitions. Word has length 43 [2021-05-06 12:17:58,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:17:58,828 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 62 transitions. [2021-05-06 12:17:58,828 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 23 states have internal predecessors, (35), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:17:58,828 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 62 transitions. [2021-05-06 12:17:58,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-06 12:17:58,828 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:17:58,828 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:17:58,829 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-05-06 12:17:58,829 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:17:58,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:17:58,829 INFO L82 PathProgramCache]: Analyzing trace with hash -600741085, now seen corresponding path program 9 times [2021-05-06 12:17:58,829 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:17:58,829 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1984945952] [2021-05-06 12:17:58,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:17:58,842 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size [2021-05-06 12:17:58,843 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:17:58,864 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:17:58,926 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size 43 [2021-05-06 12:17:59,005 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:17:59,006 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:17:59,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:59,175 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 22 [2021-05-06 12:17:59,324 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:17:59,325 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:17:59,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:59,333 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-06 12:17:59,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:17:59,861 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2021-05-06 12:17:59,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-06 12:17:59,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:18:01,294 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:18:01,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:18:01,779 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:18:01,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:18:04,829 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:18:05,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:18:05,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:18:05,468 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:18:05,468 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1984945952] [2021-05-06 12:18:05,468 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1984945952] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:18:05,468 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:18:05,469 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 12:18:05,469 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601682909] [2021-05-06 12:18:05,469 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 12:18:05,469 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:18:05,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 12:18:05,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=621, Unknown=1, NotChecked=0, Total=702 [2021-05-06 12:18:05,470 INFO L87 Difference]: Start difference. First operand 58 states and 62 transitions. Second operand has 25 states, 23 states have (on average 1.608695652173913) internal successors, (37), 23 states have internal predecessors, (37), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:18:05,894 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:18:08,247 WARN L205 SmtUtils]: Spent 206.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-06 12:18:12,643 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-06 12:18:13,119 WARN L205 SmtUtils]: Spent 376.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 68 [2021-05-06 12:18:15,610 WARN L205 SmtUtils]: Spent 364.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 66 [2021-05-06 12:18:16,150 WARN L205 SmtUtils]: Spent 446.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 73 [2021-05-06 12:18:16,572 WARN L205 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-06 12:18:16,898 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:18:17,159 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:18:17,489 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:18:17,813 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:18:18,141 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:18:18,468 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:18:18,794 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:18:19,146 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:18:19,603 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:18:19,921 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-06 12:18:20,494 WARN L205 SmtUtils]: Spent 321.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 46 [2021-05-06 12:18:20,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:18:20,944 INFO L93 Difference]: Finished difference Result 71 states and 76 transitions. [2021-05-06 12:18:20,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 12:18:20,945 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 1.608695652173913) internal successors, (37), 23 states have internal predecessors, (37), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 45 [2021-05-06 12:18:20,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:18:20,945 INFO L225 Difference]: With dead ends: 71 [2021-05-06 12:18:20,945 INFO L226 Difference]: Without dead ends: 61 [2021-05-06 12:18:20,946 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 495 ImplicationChecksByTransitivity, 16973.9ms TimeCoverageRelationStatistics Valid=207, Invalid=1769, Unknown=4, NotChecked=0, Total=1980 [2021-05-06 12:18:20,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-06 12:18:20,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2021-05-06 12:18:20,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 48 states have (on average 1.0833333333333333) internal successors, (52), 50 states have internal predecessors, (52), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-06 12:18:20,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2021-05-06 12:18:20,971 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 45 [2021-05-06 12:18:20,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:18:20,971 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2021-05-06 12:18:20,971 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 23 states have (on average 1.608695652173913) internal successors, (37), 23 states have internal predecessors, (37), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:18:20,971 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2021-05-06 12:18:20,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-06 12:18:20,972 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:18:20,972 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:18:20,972 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-05-06 12:18:20,972 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:18:20,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:18:20,973 INFO L82 PathProgramCache]: Analyzing trace with hash -694671041, now seen corresponding path program 10 times [2021-05-06 12:18:20,973 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:18:20,973 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [66204117] [2021-05-06 12:18:20,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:18:20,993 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size [2021-05-06 12:18:21,020 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:18:21,041 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:18:21,079 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size 43 [2021-05-06 12:18:21,160 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:18:21,161 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:18:21,163 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 88.9 percent of original size [2021-05-06 12:18:21,188 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:18:21,209 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 18 [2021-05-06 12:18:21,244 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 88.9 percent of original size 48 [2021-05-06 12:18:21,323 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:18:21,324 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:18:21,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:18:21,571 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:18:21,571 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:18:21,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:18:21,580 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-06 12:18:21,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:18:21,916 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 10 [2021-05-06 12:18:22,146 WARN L205 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 14 [2021-05-06 12:18:22,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-06 12:18:22,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:18:23,407 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:18:23,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:18:25,447 WARN L205 SmtUtils]: Spent 2.04 s on a formula simplification that was a NOOP. DAG size: 34 [2021-05-06 12:18:31,697 WARN L205 SmtUtils]: Spent 2.04 s on a formula simplification that was a NOOP. DAG size: 34 [2021-05-06 12:18:31,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:18:33,890 WARN L205 SmtUtils]: Spent 2.06 s on a formula simplification that was a NOOP. DAG size: 35 [2021-05-06 12:18:33,892 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:18:38,127 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:18:46,523 WARN L205 SmtUtils]: Spent 2.05 s on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 12:18:46,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:18:57,164 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:18:57,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:18:57,535 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:18:57,793 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:18:57,793 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [66204117] [2021-05-06 12:18:57,793 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [66204117] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:18:57,793 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:18:57,793 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 12:18:57,793 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452428054] [2021-05-06 12:18:57,793 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 12:18:57,793 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:18:57,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 12:18:57,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=660, Unknown=11, NotChecked=0, Total=756 [2021-05-06 12:18:57,794 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand has 26 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 24 states have internal predecessors, (37), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:19:00,266 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:19:13,111 WARN L205 SmtUtils]: Spent 2.17 s on a formula simplification that was a NOOP. DAG size: 71 [2021-05-06 12:19:27,795 WARN L205 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2021-05-06 12:19:38,433 WARN L205 SmtUtils]: Spent 2.46 s on a formula simplification. DAG size of input: 81 DAG size of output: 78 [2021-05-06 12:19:55,536 WARN L205 SmtUtils]: Spent 2.17 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-06 12:20:08,542 WARN L205 SmtUtils]: Spent 4.71 s on a formula simplification. DAG size of input: 85 DAG size of output: 82 [2021-05-06 12:20:31,371 WARN L205 SmtUtils]: Spent 2.18 s on a formula simplification that was a NOOP. DAG size: 74 [2021-05-06 12:20:56,532 WARN L205 SmtUtils]: Spent 4.51 s on a formula simplification. DAG size of input: 82 DAG size of output: 79 [2021-05-06 12:21:26,075 WARN L205 SmtUtils]: Spent 2.59 s on a formula simplification. DAG size of input: 86 DAG size of output: 83 [2021-05-06 12:21:28,433 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-06 12:21:49,733 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:21:52,045 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:21:52,374 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:21:52,694 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:21:53,011 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:21:53,329 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:21:53,645 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:21:53,976 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:21:54,230 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-06 12:21:54,728 WARN L205 SmtUtils]: Spent 313.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 46 [2021-05-06 12:21:55,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:21:55,367 INFO L93 Difference]: Finished difference Result 77 states and 83 transitions. [2021-05-06 12:21:55,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 12:21:55,368 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 24 states have internal predecessors, (37), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 45 [2021-05-06 12:21:55,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:21:55,368 INFO L225 Difference]: With dead ends: 77 [2021-05-06 12:21:55,368 INFO L226 Difference]: Without dead ends: 71 [2021-05-06 12:21:55,369 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 580 ImplicationChecksByTransitivity, 132440.4ms TimeCoverageRelationStatistics Valid=228, Invalid=1981, Unknown=47, NotChecked=0, Total=2256 [2021-05-06 12:21:55,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-06 12:21:55,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 62. [2021-05-06 12:21:55,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 50 states have (on average 1.1) internal successors, (55), 52 states have internal predecessors, (55), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-05-06 12:21:55,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2021-05-06 12:21:55,389 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 45 [2021-05-06 12:21:55,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:21:55,389 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2021-05-06 12:21:55,389 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 24 states have internal predecessors, (37), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:21:55,389 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2021-05-06 12:21:55,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-06 12:21:55,389 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:21:55,390 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:21:55,390 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-06 12:21:55,390 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:21:55,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:21:55,390 INFO L82 PathProgramCache]: Analyzing trace with hash 760175013, now seen corresponding path program 11 times [2021-05-06 12:21:55,390 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:21:55,390 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [152756022] [2021-05-06 12:21:55,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:21:55,403 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size [2021-05-06 12:21:55,434 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:21:55,455 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:21:55,500 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size 43 [2021-05-06 12:21:55,576 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:21:55,577 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:21:55,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:21:55,835 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:21:55,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:21:55,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:21:55,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-06 12:21:55,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:21:56,312 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 14 [2021-05-06 12:21:56,382 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-06 12:21:56,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:21:57,880 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:21:57,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:22:00,284 WARN L205 SmtUtils]: Spent 2.40 s on a formula simplification that was a NOOP. DAG size: 34 [2021-05-06 12:22:06,676 WARN L205 SmtUtils]: Spent 2.05 s on a formula simplification that was a NOOP. DAG size: 34 [2021-05-06 12:22:06,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:22:08,915 WARN L205 SmtUtils]: Spent 2.06 s on a formula simplification that was a NOOP. DAG size: 35 [2021-05-06 12:22:08,916 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:22:16,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:22:16,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:22:16,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:22:16,668 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:22:16,668 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [152756022] [2021-05-06 12:22:16,668 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [152756022] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:22:16,668 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:22:16,668 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 12:22:16,668 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048651615] [2021-05-06 12:22:16,668 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 12:22:16,668 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:22:16,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 12:22:16,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=670, Unknown=4, NotChecked=0, Total=756 [2021-05-06 12:22:16,669 INFO L87 Difference]: Start difference. First operand 62 states and 67 transitions. Second operand has 26 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:22:19,080 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:22:23,419 WARN L205 SmtUtils]: Spent 2.19 s on a formula simplification that was a NOOP. DAG size: 71 [2021-05-06 12:22:33,792 WARN L205 SmtUtils]: Spent 2.18 s on a formula simplification that was a NOOP. DAG size: 73 [2021-05-06 12:22:42,423 WARN L205 SmtUtils]: Spent 4.49 s on a formula simplification. DAG size of input: 81 DAG size of output: 78 [2021-05-06 12:22:53,412 WARN L205 SmtUtils]: Spent 4.54 s on a formula simplification. DAG size of input: 85 DAG size of output: 82 [2021-05-06 12:23:10,048 WARN L205 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-06 12:23:14,741 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:23:15,020 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:23:15,380 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:23:15,744 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:23:16,117 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:23:16,489 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:23:16,862 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:23:17,228 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:23:17,746 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:23:18,258 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:23:18,573 WARN L205 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-06 12:23:19,118 WARN L205 SmtUtils]: Spent 323.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 46 [2021-05-06 12:23:19,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:23:19,736 INFO L93 Difference]: Finished difference Result 83 states and 91 transitions. [2021-05-06 12:23:19,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 12:23:19,736 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 47 [2021-05-06 12:23:19,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:23:19,737 INFO L225 Difference]: With dead ends: 83 [2021-05-06 12:23:19,737 INFO L226 Difference]: Without dead ends: 77 [2021-05-06 12:23:19,738 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 511 ImplicationChecksByTransitivity, 45452.4ms TimeCoverageRelationStatistics Valid=201, Invalid=1860, Unknown=9, NotChecked=0, Total=2070 [2021-05-06 12:23:19,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-06 12:23:19,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2021-05-06 12:23:19,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 59 states have (on average 1.1016949152542372) internal successors, (65), 63 states have internal predecessors, (65), 7 states have call successors, (7), 5 states have call predecessors, (7), 7 states have return successors, (10), 5 states have call predecessors, (10), 5 states have call successors, (10) [2021-05-06 12:23:19,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 82 transitions. [2021-05-06 12:23:19,764 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 82 transitions. Word has length 47 [2021-05-06 12:23:19,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:23:19,764 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 82 transitions. [2021-05-06 12:23:19,765 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 12:23:19,765 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 82 transitions. [2021-05-06 12:23:19,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-06 12:23:19,765 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:23:19,765 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:23:19,765 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-05-06 12:23:19,765 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:23:19,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:23:19,766 INFO L82 PathProgramCache]: Analyzing trace with hash 593870557, now seen corresponding path program 12 times [2021-05-06 12:23:19,766 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:23:19,766 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1389823253] [2021-05-06 12:23:19,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:23:19,784 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size [2021-05-06 12:23:19,785 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:23:19,806 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:23:19,869 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 87.8 percent of original size 43 [2021-05-06 12:23:19,950 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:23:19,951 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:23:19,953 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 88.9 percent of original size [2021-05-06 12:23:19,954 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:23:19,977 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 18 [2021-05-06 12:23:20,039 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 88.9 percent of original size 48 [2021-05-06 12:23:20,120 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:23:20,121 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 12:23:20,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:23:20,272 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2021-05-06 12:23:20,441 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2021-05-06 12:23:20,441 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:23:20,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:23:20,445 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-05-06 12:23:20,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:23:20,651 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2021-05-06 12:23:20,819 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 10 [2021-05-06 12:23:21,090 WARN L205 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 14 [2021-05-06 12:23:21,177 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-06 12:23:21,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:23:22,433 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:23:22,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:23:24,479 WARN L205 SmtUtils]: Spent 2.04 s on a formula simplification that was a NOOP. DAG size: 34 [2021-05-06 12:23:30,777 WARN L205 SmtUtils]: Spent 2.04 s on a formula simplification that was a NOOP. DAG size: 34 [2021-05-06 12:23:30,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:23:34,969 WARN L205 SmtUtils]: Spent 2.05 s on a formula simplification that was a NOOP. DAG size: 35 [2021-05-06 12:23:34,971 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:23:39,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:23:47,613 WARN L205 SmtUtils]: Spent 2.05 s on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 12:23:47,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:23:55,994 WARN L159 QuantifierPusher]: Ignoring assumption.