/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loop-simple/deep-nested.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-03 00:29:15,292 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-03 00:29:15,295 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-03 00:29:15,334 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-03 00:29:15,391 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-03 00:29:15,392 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-03 00:29:15,395 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-03 00:29:15,399 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-03 00:29:15,429 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-03 00:29:15,429 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-03 00:29:15,433 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-03 00:29:15,433 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-03 00:29:15,433 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-03 00:29:15,433 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-03 00:29:15,434 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-03 00:29:15,434 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-03 00:29:15,434 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-03 00:29:15,434 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-03 00:29:15,435 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-03 00:29:15,435 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-03 00:29:15,435 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-03 00:29:15,436 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-03 00:29:15,436 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-03 00:29:15,436 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-03 00:29:15,436 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-03 00:29:15,436 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-03 00:29:15,436 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-03 00:29:15,437 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-03 00:29:15,437 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-03 00:29:15,437 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-03 00:29:15,437 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-03 00:29:15,437 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-03 00:29:15,784 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-03 00:29:15,808 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-03 00:29:15,811 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-03 00:29:15,812 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-03 00:29:15,813 INFO L275 PluginConnector]: CDTParser initialized [2021-05-03 00:29:15,813 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-simple/deep-nested.c [2021-05-03 00:29:15,877 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f06238b82/8131284468e149f7871b3e7e89ca7486/FLAGfd45b3504 [2021-05-03 00:29:16,248 INFO L306 CDTParser]: Found 1 translation units. [2021-05-03 00:29:16,249 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/deep-nested.c [2021-05-03 00:29:16,254 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f06238b82/8131284468e149f7871b3e7e89ca7486/FLAGfd45b3504 [2021-05-03 00:29:16,275 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f06238b82/8131284468e149f7871b3e7e89ca7486 [2021-05-03 00:29:16,278 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-03 00:29:16,280 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-03 00:29:16,285 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-03 00:29:16,285 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-03 00:29:16,289 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-03 00:29:16,290 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.05 12:29:16" (1/1) ... [2021-05-03 00:29:16,291 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7c051f82 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:29:16, skipping insertion in model container [2021-05-03 00:29:16,291 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.05 12:29:16" (1/1) ... [2021-05-03 00:29:16,297 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-03 00:29:16,310 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-03 00:29:16,462 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/deep-nested.c[625,638] [2021-05-03 00:29:16,477 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-03 00:29:16,484 INFO L203 MainTranslator]: Completed pre-run [2021-05-03 00:29:16,508 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/deep-nested.c[625,638] [2021-05-03 00:29:16,513 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-03 00:29:16,526 INFO L208 MainTranslator]: Completed translation [2021-05-03 00:29:16,527 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:29:16 WrapperNode [2021-05-03 00:29:16,527 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-03 00:29:16,528 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-03 00:29:16,528 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-03 00:29:16,529 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-03 00:29:16,557 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:29:16" (1/1) ... [2021-05-03 00:29:16,557 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:29:16" (1/1) ... [2021-05-03 00:29:16,563 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:29:16" (1/1) ... [2021-05-03 00:29:16,563 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:29:16" (1/1) ... [2021-05-03 00:29:16,592 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:29:16" (1/1) ... [2021-05-03 00:29:16,599 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:29:16" (1/1) ... [2021-05-03 00:29:16,604 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:29:16" (1/1) ... [2021-05-03 00:29:16,608 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-03 00:29:16,609 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-03 00:29:16,609 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-03 00:29:16,609 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-03 00:29:16,609 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:29:16" (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 [2021-05-03 00:29:16,689 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-03 00:29:16,689 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-03 00:29:16,690 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-03 00:29:16,690 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-03 00:29:16,690 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-03 00:29:16,690 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-03 00:29:16,690 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-03 00:29:16,691 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-03 00:29:16,691 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-03 00:29:16,691 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-03 00:29:16,691 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-03 00:29:16,691 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-03 00:29:16,692 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-03 00:29:16,692 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-03 00:29:17,022 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-03 00:29:17,023 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2021-05-03 00:29:17,024 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.05 12:29:17 BoogieIcfgContainer [2021-05-03 00:29:17,024 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-03 00:29:17,026 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-03 00:29:17,026 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-03 00:29:17,034 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-03 00:29:17,034 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.05 12:29:16" (1/3) ... [2021-05-03 00:29:17,035 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@563ec929 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.05 12:29:17, skipping insertion in model container [2021-05-03 00:29:17,039 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:29:16" (2/3) ... [2021-05-03 00:29:17,039 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@563ec929 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.05 12:29:17, skipping insertion in model container [2021-05-03 00:29:17,039 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.05 12:29:17" (3/3) ... [2021-05-03 00:29:17,040 INFO L111 eAbstractionObserver]: Analyzing ICFG deep-nested.c [2021-05-03 00:29:17,046 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-03 00:29:17,058 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-03 00:29:17,072 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-03 00:29:17,088 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-03 00:29:17,088 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-03 00:29:17,088 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-03 00:29:17,088 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-03 00:29:17,088 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-03 00:29:17,088 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-03 00:29:17,088 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-03 00:29:17,089 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-03 00:29:17,104 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 19 states have internal predecessors, (30), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-03 00:29:17,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-03 00:29:17,111 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:29:17,111 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:29:17,112 INFO L428 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:29:17,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:29:17,120 INFO L82 PathProgramCache]: Analyzing trace with hash 764687304, now seen corresponding path program 1 times [2021-05-03 00:29:17,127 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:29:17,128 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1498275070] [2021-05-03 00:29:17,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:29:17,193 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:29:17,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:17,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:29:17,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:17,554 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:29:17,557 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:29:17,558 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1498275070] [2021-05-03 00:29:17,560 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1498275070] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:29:17,560 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:29:17,560 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-03 00:29:17,561 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631936201] [2021-05-03 00:29:17,564 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-03 00:29:17,565 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:29:17,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-03 00:29:17,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-03 00:29:17,578 INFO L87 Difference]: Start difference. First operand has 24 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 19 states have internal predecessors, (30), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:17,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:29:17,909 INFO L93 Difference]: Finished difference Result 45 states and 68 transitions. [2021-05-03 00:29:17,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-03 00:29:17,913 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-05-03 00:29:17,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:29:17,919 INFO L225 Difference]: With dead ends: 45 [2021-05-03 00:29:17,919 INFO L226 Difference]: Without dead ends: 22 [2021-05-03 00:29:17,922 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 224.7ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-03 00:29:17,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-03 00:29:17,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-05-03 00:29:17,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:17,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-05-03 00:29:17,957 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2021-05-03 00:29:17,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:29:17,957 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-05-03 00:29:17,957 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:17,958 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-05-03 00:29:17,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-03 00:29:17,958 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:29:17,958 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:29:17,959 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-03 00:29:17,959 INFO L428 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:29:17,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:29:17,960 INFO L82 PathProgramCache]: Analyzing trace with hash 296825287, now seen corresponding path program 1 times [2021-05-03 00:29:17,960 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:29:17,960 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [566178286] [2021-05-03 00:29:17,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:29:17,996 INFO L181 rdanLoopAcceleration]: Guard: Formula: (and (not (= (mod v_main_~a~0_10 4294967296) (mod v_main_~b~0_9 4294967296))) (< (mod v_main_~e~0_10 4294967296) (mod (+ v_main_~uint32_max~0_16 4294967295) 4294967296))) InVars {main_~e~0=v_main_~e~0_10, main_~b~0=v_main_~b~0_9, main_~uint32_max~0=v_main_~uint32_max~0_16, main_~a~0=v_main_~a~0_10} OutVars{main_~e~0=v_main_~e~0_10, main_~b~0=v_main_~b~0_9, main_~uint32_max~0=v_main_~uint32_max~0_16, main_~a~0=v_main_~a~0_10} AuxVars[] AssignedVars[] [2021-05-03 00:29:18,007 WARN L240 tifierPushTermWalker]: treesize reduction 30, result has 74.4 percent of original size [2021-05-03 00:29:19,019 WARN L205 SmtUtils]: Spent 990.00 ms on a formula simplification that was a NOOP. DAG size: 6 [2021-05-03 00:29:19,022 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:19,081 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-03 00:29:19,112 WARN L245 tifierPushTermWalker]: treesize reduction 30, result has 74.4 percent of original size 87 [2021-05-03 00:29:19,155 INFO L181 rdanLoopAcceleration]: Guard: Formula: (let ((.cse0 (mod v_main_~e~0_10 4294967296))) (and (< .cse0 (mod (+ v_main_~uint32_max~0_16 4294967295) 4294967296)) (not (= (mod (+ v_main_~uint32_max~0_16 4294967294) 4294967296) .cse0)))) InVars {main_~uint32_max~0=v_main_~uint32_max~0_16, main_~e~0=v_main_~e~0_10} OutVars{main_~uint32_max~0=v_main_~uint32_max~0_16, main_~e~0=v_main_~e~0_10} AuxVars[] AssignedVars[] [2021-05-03 00:29:19,161 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 94.3 percent of original size [2021-05-03 00:29:19,186 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:19,196 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:21,761 WARN L205 SmtUtils]: Spent 2.56 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-03 00:29:24,869 WARN L205 SmtUtils]: Spent 3.11 s on a formula simplification that was a NOOP. DAG size: 18 [2021-05-03 00:29:28,909 WARN L205 SmtUtils]: Spent 4.04 s on a formula simplification. DAG size of input: 14 DAG size of output: 1 [2021-05-03 00:29:28,963 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 44 [2021-05-03 00:29:29,381 WARN L205 SmtUtils]: Spent 414.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2021-05-03 00:29:29,596 WARN L205 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 1 [2021-05-03 00:29:29,598 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 34 [2021-05-03 00:29:29,862 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 94.3 percent of original size 116 [2021-05-03 00:29:29,926 INFO L181 rdanLoopAcceleration]: Guard: Formula: (and (< (mod v_main_~e~0_10 4294967296) (mod (+ v_main_~uint32_max~0_16 4294967295) 4294967296)) (not (= (mod v_main_~c~0_9 4294967296) (mod v_main_~d~0_9 4294967296)))) InVars {main_~c~0=v_main_~c~0_9, main_~d~0=v_main_~d~0_9, main_~e~0=v_main_~e~0_10, main_~uint32_max~0=v_main_~uint32_max~0_16} OutVars{main_~c~0=v_main_~c~0_9, main_~d~0=v_main_~d~0_9, main_~e~0=v_main_~e~0_10, main_~uint32_max~0=v_main_~uint32_max~0_16} AuxVars[] AssignedVars[] [2021-05-03 00:29:29,933 WARN L240 tifierPushTermWalker]: treesize reduction 30, result has 74.4 percent of original size [2021-05-03 00:29:29,965 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:30,000 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-03 00:29:30,037 WARN L245 tifierPushTermWalker]: treesize reduction 30, result has 74.4 percent of original size 87 [2021-05-03 00:29:30,124 INFO L181 rdanLoopAcceleration]: Guard: Formula: (let ((.cse0 (mod v_main_~e~0_10 4294967296))) (and (< .cse0 (mod (+ v_main_~uint32_max~0_16 4294967295) 4294967296)) (not (= (mod v_main_~d~0_9 4294967296) .cse0)))) InVars {main_~d~0=v_main_~d~0_9, main_~e~0=v_main_~e~0_10, main_~uint32_max~0=v_main_~uint32_max~0_16} OutVars{main_~d~0=v_main_~d~0_9, main_~e~0=v_main_~e~0_10, main_~uint32_max~0=v_main_~uint32_max~0_16} AuxVars[] AssignedVars[] [2021-05-03 00:29:30,131 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 91.5 percent of original size [2021-05-03 00:29:30,135 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:30,141 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:32,185 WARN L205 SmtUtils]: Spent 2.04 s on a formula simplification. DAG size of input: 14 DAG size of output: 1 [2021-05-03 00:29:32,233 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-05-03 00:29:32,264 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-03 00:29:32,415 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 91.5 percent of original size 108 [2021-05-03 00:29:32,561 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-03 00:29:32,581 INFO L181 rdanLoopAcceleration]: Guard: Formula: (and (not (= (mod v_main_~c~0_9 4294967296) (mod v_main_~b~0_9 4294967296))) (< (mod v_main_~e~0_10 4294967296) (mod (+ v_main_~uint32_max~0_16 4294967295) 4294967296))) InVars {main_~c~0=v_main_~c~0_9, main_~e~0=v_main_~e~0_10, main_~b~0=v_main_~b~0_9, main_~uint32_max~0=v_main_~uint32_max~0_16} OutVars{main_~c~0=v_main_~c~0_9, main_~e~0=v_main_~e~0_10, main_~b~0=v_main_~b~0_9, main_~uint32_max~0=v_main_~uint32_max~0_16} AuxVars[] AssignedVars[] [2021-05-03 00:29:32,593 WARN L240 tifierPushTermWalker]: treesize reduction 30, result has 74.4 percent of original size [2021-05-03 00:29:32,595 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:32,627 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-03 00:29:32,690 WARN L245 tifierPushTermWalker]: treesize reduction 30, result has 74.4 percent of original size 87 [2021-05-03 00:29:32,737 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-03 00:29:32,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:33,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:29:33,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:33,100 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:29:33,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:29:33,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:29:33,195 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:29:33,243 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:29:33,327 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:29:33,327 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [566178286] [2021-05-03 00:29:33,327 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [566178286] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:29:33,332 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:29:33,334 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-03 00:29:33,337 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335814496] [2021-05-03 00:29:33,339 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-03 00:29:33,341 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:29:33,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-03 00:29:33,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-03 00:29:33,348 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:33,829 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 47 [2021-05-03 00:29:33,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:29:33,894 INFO L93 Difference]: Finished difference Result 44 states and 55 transitions. [2021-05-03 00:29:33,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-03 00:29:33,895 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2021-05-03 00:29:33,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:29:33,896 INFO L225 Difference]: With dead ends: 44 [2021-05-03 00:29:33,896 INFO L226 Difference]: Without dead ends: 29 [2021-05-03 00:29:33,897 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 549.6ms TimeCoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2021-05-03 00:29:33,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-03 00:29:33,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2021-05-03 00:29:33,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 22 states have internal predecessors, (28), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:33,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2021-05-03 00:29:33,911 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 16 [2021-05-03 00:29:33,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:29:33,911 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2021-05-03 00:29:33,912 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:33,912 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2021-05-03 00:29:33,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-03 00:29:33,913 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:29:33,913 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:29:33,913 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-03 00:29:33,913 INFO L428 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:29:33,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:29:33,914 INFO L82 PathProgramCache]: Analyzing trace with hash 939491854, now seen corresponding path program 1 times [2021-05-03 00:29:33,914 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:29:33,914 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1382753318] [2021-05-03 00:29:33,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:29:33,928 INFO L181 rdanLoopAcceleration]: Guard: Formula: (let ((.cse0 (mod (+ v_main_~uint32_max~0_17 4294967295) 4294967296))) (and (<= .cse0 1) (< 0 .cse0) (not (= (mod v_main_~b~0_10 4294967296) (mod v_main_~c~0_10 4294967296))) (< (mod v_main_~d~0_11 4294967296) .cse0))) InVars {main_~c~0=v_main_~c~0_10, main_~d~0=v_main_~d~0_11, main_~b~0=v_main_~b~0_10, main_~uint32_max~0=v_main_~uint32_max~0_17} OutVars{main_~c~0=v_main_~c~0_10, main_~d~0=v_main_~d~0_11, main_~b~0=v_main_~b~0_10, main_~uint32_max~0=v_main_~uint32_max~0_17} AuxVars[] AssignedVars[] [2021-05-03 00:29:33,942 WARN L240 tifierPushTermWalker]: treesize reduction 62, result has 66.7 percent of original size [2021-05-03 00:29:33,996 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:34,022 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-03 00:29:34,066 WARN L245 tifierPushTermWalker]: treesize reduction 62, result has 66.7 percent of original size 124 [2021-05-03 00:29:34,125 INFO L181 rdanLoopAcceleration]: Guard: Formula: (let ((.cse0 (mod (+ v_main_~uint32_max~0_17 4294967295) 4294967296))) (and (<= .cse0 1) (< 0 .cse0) (< (mod v_main_~d~0_11 4294967296) .cse0) (not (= (mod (+ v_main_~uint32_max~0_17 4294967294) 4294967296) 0)))) InVars {main_~uint32_max~0=v_main_~uint32_max~0_17, main_~d~0=v_main_~d~0_11} OutVars{main_~uint32_max~0=v_main_~uint32_max~0_17, main_~d~0=v_main_~d~0_11} AuxVars[] AssignedVars[] [2021-05-03 00:29:34,130 WARN L240 tifierPushTermWalker]: treesize reduction 56, result has 68.9 percent of original size [2021-05-03 00:29:34,170 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:34,188 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-03 00:29:34,204 WARN L245 tifierPushTermWalker]: treesize reduction 56, result has 68.9 percent of original size 124 [2021-05-03 00:29:34,219 INFO L181 rdanLoopAcceleration]: Guard: Formula: (let ((.cse1 (mod v_main_~d~0_11 4294967296)) (.cse0 (mod (+ v_main_~uint32_max~0_17 4294967295) 4294967296))) (and (<= .cse0 1) (< 0 .cse0) (not (= (mod v_main_~c~0_10 4294967296) .cse1)) (< .cse1 .cse0))) InVars {main_~c~0=v_main_~c~0_10, main_~d~0=v_main_~d~0_11, main_~uint32_max~0=v_main_~uint32_max~0_17} OutVars{main_~c~0=v_main_~c~0_10, main_~d~0=v_main_~d~0_11, main_~uint32_max~0=v_main_~uint32_max~0_17} AuxVars[] AssignedVars[] [2021-05-03 00:29:34,227 WARN L240 tifierPushTermWalker]: treesize reduction 42, result has 77.5 percent of original size [2021-05-03 00:29:34,297 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:34,304 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:34,349 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-05-03 00:29:34,355 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-05-03 00:29:34,365 WARN L245 tifierPushTermWalker]: treesize reduction 42, result has 77.5 percent of original size 145 [2021-05-03 00:29:34,393 INFO L181 rdanLoopAcceleration]: Guard: Formula: (let ((.cse1 (mod v_main_~d~0_11 4294967296)) (.cse0 (mod (+ v_main_~uint32_max~0_17 4294967295) 4294967296))) (and (<= .cse0 1) (< 0 .cse0) (not (= 0 .cse1)) (< .cse1 .cse0))) InVars {main_~uint32_max~0=v_main_~uint32_max~0_17, main_~d~0=v_main_~d~0_11} OutVars{main_~uint32_max~0=v_main_~uint32_max~0_17, main_~d~0=v_main_~d~0_11} AuxVars[] AssignedVars[] [2021-05-03 00:29:34,403 WARN L240 tifierPushTermWalker]: treesize reduction 39, result has 77.8 percent of original size [2021-05-03 00:29:34,408 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:34,425 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:34,449 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-03 00:29:34,455 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-03 00:29:34,502 WARN L245 tifierPushTermWalker]: treesize reduction 39, result has 77.8 percent of original size 137 [2021-05-03 00:29:34,523 INFO L181 rdanLoopAcceleration]: Guard: Formula: (let ((.cse0 (mod (+ v_main_~uint32_max~0_17 4294967295) 4294967296))) (and (<= .cse0 1) (< 0 .cse0) (not (= (mod v_main_~b~0_10 4294967296) (mod v_main_~a~0_11 4294967296))) (< (mod v_main_~d~0_11 4294967296) .cse0))) InVars {main_~d~0=v_main_~d~0_11, main_~b~0=v_main_~b~0_10, main_~uint32_max~0=v_main_~uint32_max~0_17, main_~a~0=v_main_~a~0_11} OutVars{main_~d~0=v_main_~d~0_11, main_~b~0=v_main_~b~0_10, main_~uint32_max~0=v_main_~uint32_max~0_17, main_~a~0=v_main_~a~0_11} AuxVars[] AssignedVars[] [2021-05-03 00:29:34,530 WARN L240 tifierPushTermWalker]: treesize reduction 62, result has 66.7 percent of original size [2021-05-03 00:29:34,594 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:34,620 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-03 00:29:34,661 WARN L245 tifierPushTermWalker]: treesize reduction 62, result has 66.7 percent of original size 124 [2021-05-03 00:29:34,709 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-03 00:29:34,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:34,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:29:34,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:34,983 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:29:35,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-03 00:29:35,101 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:29:35,103 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1382753318] [2021-05-03 00:29:35,103 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1382753318] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:29:35,103 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:29:35,104 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-03 00:29:35,104 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204276925] [2021-05-03 00:29:35,105 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-03 00:29:35,105 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:29:35,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-03 00:29:35,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-03 00:29:35,106 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:35,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:29:35,400 INFO L93 Difference]: Finished difference Result 73 states and 92 transitions. [2021-05-03 00:29:35,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-03 00:29:35,401 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-05-03 00:29:35,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:29:35,402 INFO L225 Difference]: With dead ends: 73 [2021-05-03 00:29:35,403 INFO L226 Difference]: Without dead ends: 53 [2021-05-03 00:29:35,403 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 5 SyntacticMatches, 6 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 248.2ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-03 00:29:35,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-03 00:29:35,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 41. [2021-05-03 00:29:35,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 37 states have (on average 1.2702702702702702) internal successors, (47), 37 states have internal predecessors, (47), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:35,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 50 transitions. [2021-05-03 00:29:35,417 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 50 transitions. Word has length 22 [2021-05-03 00:29:35,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:29:35,417 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 50 transitions. [2021-05-03 00:29:35,417 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:35,417 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 50 transitions. [2021-05-03 00:29:35,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-03 00:29:35,418 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:29:35,418 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:29:35,418 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-03 00:29:35,419 INFO L428 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:29:35,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:29:35,419 INFO L82 PathProgramCache]: Analyzing trace with hash -880259584, now seen corresponding path program 1 times [2021-05-03 00:29:35,419 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:29:35,419 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [482047430] [2021-05-03 00:29:35,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:29:35,422 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:29:35,424 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:35,446 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 14 [2021-05-03 00:29:35,453 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:29:35,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:35,631 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:29:35,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:35,640 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:29:35,687 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:29:35,688 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [482047430] [2021-05-03 00:29:35,688 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [482047430] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:29:35,688 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:29:35,688 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-03 00:29:35,688 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504444482] [2021-05-03 00:29:35,689 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-03 00:29:35,690 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:29:35,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-03 00:29:35,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-03 00:29:35,691 INFO L87 Difference]: Start difference. First operand 41 states and 50 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:36,176 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 55 [2021-05-03 00:29:36,543 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 51 [2021-05-03 00:29:36,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:29:36,631 INFO L93 Difference]: Finished difference Result 144 states and 185 transitions. [2021-05-03 00:29:36,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-03 00:29:36,632 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-05-03 00:29:36,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:29:36,634 INFO L225 Difference]: With dead ends: 144 [2021-05-03 00:29:36,634 INFO L226 Difference]: Without dead ends: 102 [2021-05-03 00:29:36,635 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 6 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 778.1ms TimeCoverageRelationStatistics Valid=87, Invalid=185, Unknown=0, NotChecked=0, Total=272 [2021-05-03 00:29:36,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-05-03 00:29:36,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 79. [2021-05-03 00:29:36,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 75 states have (on average 1.2133333333333334) internal successors, (91), 75 states have internal predecessors, (91), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:36,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 94 transitions. [2021-05-03 00:29:36,659 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 94 transitions. Word has length 25 [2021-05-03 00:29:36,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:29:36,660 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 94 transitions. [2021-05-03 00:29:36,660 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:36,660 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 94 transitions. [2021-05-03 00:29:36,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-03 00:29:36,661 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:29:36,661 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:29:36,661 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-03 00:29:36,661 INFO L428 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:29:36,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:29:36,662 INFO L82 PathProgramCache]: Analyzing trace with hash -672665618, now seen corresponding path program 1 times [2021-05-03 00:29:36,662 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:29:36,662 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1430765160] [2021-05-03 00:29:36,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:29:36,666 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:29:36,667 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:36,684 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 20 [2021-05-03 00:29:36,694 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:29:36,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:36,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:29:36,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:36,989 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:29:37,050 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:29:37,050 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1430765160] [2021-05-03 00:29:37,050 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1430765160] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:29:37,050 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:29:37,050 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-03 00:29:37,051 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [93322067] [2021-05-03 00:29:37,051 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-03 00:29:37,051 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:29:37,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-03 00:29:37,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-03 00:29:37,052 INFO L87 Difference]: Start difference. First operand 79 states and 94 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:37,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:29:37,367 INFO L93 Difference]: Finished difference Result 152 states and 182 transitions. [2021-05-03 00:29:37,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-03 00:29:37,368 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-05-03 00:29:37,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:29:37,373 INFO L225 Difference]: With dead ends: 152 [2021-05-03 00:29:37,373 INFO L226 Difference]: Without dead ends: 96 [2021-05-03 00:29:37,374 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 7 SyntacticMatches, 3 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 306.0ms TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-03 00:29:37,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-03 00:29:37,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 80. [2021-05-03 00:29:37,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 76 states have (on average 1.2105263157894737) internal successors, (92), 76 states have internal predecessors, (92), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:37,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 95 transitions. [2021-05-03 00:29:37,423 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 95 transitions. Word has length 37 [2021-05-03 00:29:37,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:29:37,423 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 95 transitions. [2021-05-03 00:29:37,423 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:37,424 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 95 transitions. [2021-05-03 00:29:37,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-03 00:29:37,429 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:29:37,429 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:29:37,429 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-03 00:29:37,429 INFO L428 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:29:37,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:29:37,430 INFO L82 PathProgramCache]: Analyzing trace with hash -390183749, now seen corresponding path program 1 times [2021-05-03 00:29:37,430 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:29:37,431 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [327322645] [2021-05-03 00:29:37,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:29:37,441 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:29:37,446 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:37,490 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:29:37,516 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:29:37,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:37,807 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:29:37,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:37,813 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:29:38,193 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:29:38,194 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [327322645] [2021-05-03 00:29:38,195 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [327322645] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:29:38,195 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:29:38,195 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-03 00:29:38,195 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1722150346] [2021-05-03 00:29:38,195 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-03 00:29:38,195 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:29:38,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-03 00:29:38,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=94, Unknown=0, NotChecked=0, Total=156 [2021-05-03 00:29:38,197 INFO L87 Difference]: Start difference. First operand 80 states and 95 transitions. Second operand has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:38,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:29:38,894 INFO L93 Difference]: Finished difference Result 183 states and 217 transitions. [2021-05-03 00:29:38,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-03 00:29:38,894 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 52 [2021-05-03 00:29:38,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:29:38,895 INFO L225 Difference]: With dead ends: 183 [2021-05-03 00:29:38,895 INFO L226 Difference]: Without dead ends: 112 [2021-05-03 00:29:38,896 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 11 SyntacticMatches, 9 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 879.7ms TimeCoverageRelationStatistics Valid=154, Invalid=266, Unknown=0, NotChecked=0, Total=420 [2021-05-03 00:29:38,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-05-03 00:29:38,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 84. [2021-05-03 00:29:38,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 80 states have (on average 1.2) internal successors, (96), 80 states have internal predecessors, (96), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:38,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 99 transitions. [2021-05-03 00:29:38,919 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 99 transitions. Word has length 52 [2021-05-03 00:29:38,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:29:38,920 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 99 transitions. [2021-05-03 00:29:38,920 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:38,920 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 99 transitions. [2021-05-03 00:29:38,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-03 00:29:38,921 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:29:38,922 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:29:38,922 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-03 00:29:38,922 INFO L428 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:29:38,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:29:38,922 INFO L82 PathProgramCache]: Analyzing trace with hash 989959644, now seen corresponding path program 2 times [2021-05-03 00:29:38,923 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:29:38,923 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [269982944] [2021-05-03 00:29:38,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:29:38,930 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:29:38,932 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:38,971 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:29:38,995 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:29:39,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:39,283 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:29:39,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:39,291 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:29:39,744 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:29:39,744 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [269982944] [2021-05-03 00:29:39,745 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [269982944] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:29:39,745 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:29:39,745 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-03 00:29:39,745 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [531544417] [2021-05-03 00:29:39,746 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-03 00:29:39,746 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:29:39,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-03 00:29:39,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2021-05-03 00:29:39,747 INFO L87 Difference]: Start difference. First operand 84 states and 99 transitions. Second operand has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:40,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:29:40,440 INFO L93 Difference]: Finished difference Result 186 states and 220 transitions. [2021-05-03 00:29:40,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-03 00:29:40,441 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2021-05-03 00:29:40,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:29:40,442 INFO L225 Difference]: With dead ends: 186 [2021-05-03 00:29:40,442 INFO L226 Difference]: Without dead ends: 115 [2021-05-03 00:29:40,443 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 11 SyntacticMatches, 11 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 937.6ms TimeCoverageRelationStatistics Valid=176, Invalid=330, Unknown=0, NotChecked=0, Total=506 [2021-05-03 00:29:40,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-05-03 00:29:40,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 87. [2021-05-03 00:29:40,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 83 states have (on average 1.1927710843373494) internal successors, (99), 83 states have internal predecessors, (99), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:40,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 102 transitions. [2021-05-03 00:29:40,465 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 102 transitions. Word has length 55 [2021-05-03 00:29:40,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:29:40,466 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 102 transitions. [2021-05-03 00:29:40,466 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:40,466 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 102 transitions. [2021-05-03 00:29:40,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-03 00:29:40,467 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:29:40,467 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 9, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:29:40,467 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-05-03 00:29:40,467 INFO L428 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:29:40,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:29:40,468 INFO L82 PathProgramCache]: Analyzing trace with hash 1119855899, now seen corresponding path program 3 times [2021-05-03 00:29:40,468 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:29:40,468 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [889912800] [2021-05-03 00:29:40,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:29:40,474 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:29:40,476 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:40,514 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:29:40,533 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:29:40,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:40,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:29:40,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:40,733 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:29:41,175 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:29:41,176 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [889912800] [2021-05-03 00:29:41,176 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [889912800] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:29:41,176 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:29:41,176 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-03 00:29:41,176 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131136955] [2021-05-03 00:29:41,177 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-03 00:29:41,177 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:29:41,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-03 00:29:41,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=132, Unknown=0, NotChecked=0, Total=210 [2021-05-03 00:29:41,177 INFO L87 Difference]: Start difference. First operand 87 states and 102 transitions. Second operand has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:41,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:29:41,947 INFO L93 Difference]: Finished difference Result 189 states and 223 transitions. [2021-05-03 00:29:41,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-03 00:29:41,947 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 58 [2021-05-03 00:29:41,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:29:41,948 INFO L225 Difference]: With dead ends: 189 [2021-05-03 00:29:41,948 INFO L226 Difference]: Without dead ends: 118 [2021-05-03 00:29:41,949 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 11 SyntacticMatches, 13 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 917.5ms TimeCoverageRelationStatistics Valid=198, Invalid=402, Unknown=0, NotChecked=0, Total=600 [2021-05-03 00:29:41,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-05-03 00:29:41,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 90. [2021-05-03 00:29:41,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 86 states have (on average 1.186046511627907) internal successors, (102), 86 states have internal predecessors, (102), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:41,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 105 transitions. [2021-05-03 00:29:41,972 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 105 transitions. Word has length 58 [2021-05-03 00:29:41,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:29:41,973 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 105 transitions. [2021-05-03 00:29:41,973 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:41,973 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 105 transitions. [2021-05-03 00:29:41,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-03 00:29:41,974 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:29:41,974 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:29:41,974 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-03 00:29:41,974 INFO L428 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:29:41,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:29:41,975 INFO L82 PathProgramCache]: Analyzing trace with hash 1093654908, now seen corresponding path program 4 times [2021-05-03 00:29:41,975 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:29:41,975 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1406129985] [2021-05-03 00:29:41,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:29:41,984 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:29:41,987 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:42,022 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:29:42,041 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:29:42,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:42,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:29:42,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:42,304 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:29:42,803 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:29:42,804 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1406129985] [2021-05-03 00:29:42,804 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1406129985] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:29:42,804 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:29:42,804 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-03 00:29:42,804 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1157927190] [2021-05-03 00:29:42,805 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-03 00:29:42,805 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:29:42,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-03 00:29:42,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2021-05-03 00:29:42,806 INFO L87 Difference]: Start difference. First operand 90 states and 105 transitions. Second operand has 15 states, 15 states have (on average 3.066666666666667) internal successors, (46), 14 states have internal predecessors, (46), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:43,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:29:43,598 INFO L93 Difference]: Finished difference Result 192 states and 226 transitions. [2021-05-03 00:29:43,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-03 00:29:43,599 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.066666666666667) internal successors, (46), 14 states have internal predecessors, (46), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 61 [2021-05-03 00:29:43,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:29:43,601 INFO L225 Difference]: With dead ends: 192 [2021-05-03 00:29:43,601 INFO L226 Difference]: Without dead ends: 121 [2021-05-03 00:29:43,605 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 11 SyntacticMatches, 15 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 931.2ms TimeCoverageRelationStatistics Valid=220, Invalid=482, Unknown=0, NotChecked=0, Total=702 [2021-05-03 00:29:43,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-05-03 00:29:43,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 93. [2021-05-03 00:29:43,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 89 states have (on average 1.1797752808988764) internal successors, (105), 89 states have internal predecessors, (105), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:43,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 108 transitions. [2021-05-03 00:29:43,635 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 108 transitions. Word has length 61 [2021-05-03 00:29:43,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:29:43,635 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 108 transitions. [2021-05-03 00:29:43,635 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 3.066666666666667) internal successors, (46), 14 states have internal predecessors, (46), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:43,635 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 108 transitions. [2021-05-03 00:29:43,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-03 00:29:43,637 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:29:43,638 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:29:43,638 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-05-03 00:29:43,638 INFO L428 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:29:43,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:29:43,638 INFO L82 PathProgramCache]: Analyzing trace with hash -2070987397, now seen corresponding path program 5 times [2021-05-03 00:29:43,638 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:29:43,639 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [942031437] [2021-05-03 00:29:43,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:29:43,646 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:29:43,647 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:43,682 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:29:43,700 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:29:43,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:43,906 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:29:43,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:43,924 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:29:44,455 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:29:44,456 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [942031437] [2021-05-03 00:29:44,456 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [942031437] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:29:44,456 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:29:44,456 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-03 00:29:44,456 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [860170908] [2021-05-03 00:29:44,457 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-03 00:29:44,457 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:29:44,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-03 00:29:44,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=178, Unknown=0, NotChecked=0, Total=272 [2021-05-03 00:29:44,458 INFO L87 Difference]: Start difference. First operand 93 states and 108 transitions. Second operand has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:45,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:29:45,314 INFO L93 Difference]: Finished difference Result 195 states and 229 transitions. [2021-05-03 00:29:45,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-03 00:29:45,315 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 64 [2021-05-03 00:29:45,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:29:45,316 INFO L225 Difference]: With dead ends: 195 [2021-05-03 00:29:45,316 INFO L226 Difference]: Without dead ends: 124 [2021-05-03 00:29:45,317 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 11 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 1056.7ms TimeCoverageRelationStatistics Valid=242, Invalid=570, Unknown=0, NotChecked=0, Total=812 [2021-05-03 00:29:45,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-05-03 00:29:45,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 96. [2021-05-03 00:29:45,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 92 states have (on average 1.173913043478261) internal successors, (108), 92 states have internal predecessors, (108), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:45,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 111 transitions. [2021-05-03 00:29:45,346 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 111 transitions. Word has length 64 [2021-05-03 00:29:45,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:29:45,346 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 111 transitions. [2021-05-03 00:29:45,346 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:45,347 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 111 transitions. [2021-05-03 00:29:45,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-03 00:29:45,347 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:29:45,347 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:29:45,347 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-03 00:29:45,348 INFO L428 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:29:45,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:29:45,348 INFO L82 PathProgramCache]: Analyzing trace with hash -1102781156, now seen corresponding path program 6 times [2021-05-03 00:29:45,348 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:29:45,348 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1630922067] [2021-05-03 00:29:45,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:29:45,357 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:29:45,359 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:45,394 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:29:45,412 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:29:45,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:45,618 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:29:45,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:45,624 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:29:46,226 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:29:46,226 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1630922067] [2021-05-03 00:29:46,226 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1630922067] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:29:46,227 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:29:46,227 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-03 00:29:46,227 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [150213562] [2021-05-03 00:29:46,227 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-03 00:29:46,227 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:29:46,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-03 00:29:46,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=204, Unknown=0, NotChecked=0, Total=306 [2021-05-03 00:29:46,228 INFO L87 Difference]: Start difference. First operand 96 states and 111 transitions. Second operand has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 states have internal predecessors, (52), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:47,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:29:47,228 INFO L93 Difference]: Finished difference Result 198 states and 232 transitions. [2021-05-03 00:29:47,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-03 00:29:47,229 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 states have internal predecessors, (52), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2021-05-03 00:29:47,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:29:47,230 INFO L225 Difference]: With dead ends: 198 [2021-05-03 00:29:47,230 INFO L226 Difference]: Without dead ends: 127 [2021-05-03 00:29:47,231 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 11 SyntacticMatches, 19 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 180 ImplicationChecksByTransitivity, 1212.6ms TimeCoverageRelationStatistics Valid=264, Invalid=666, Unknown=0, NotChecked=0, Total=930 [2021-05-03 00:29:47,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-03 00:29:47,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 99. [2021-05-03 00:29:47,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 95 states have (on average 1.168421052631579) internal successors, (111), 95 states have internal predecessors, (111), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:47,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 114 transitions. [2021-05-03 00:29:47,263 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 114 transitions. Word has length 67 [2021-05-03 00:29:47,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:29:47,264 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 114 transitions. [2021-05-03 00:29:47,264 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 states have internal predecessors, (52), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:47,264 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 114 transitions. [2021-05-03 00:29:47,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-03 00:29:47,266 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:29:47,266 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:29:47,266 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-03 00:29:47,266 INFO L428 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:29:47,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:29:47,267 INFO L82 PathProgramCache]: Analyzing trace with hash 2023951835, now seen corresponding path program 7 times [2021-05-03 00:29:47,267 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:29:47,267 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2107804772] [2021-05-03 00:29:47,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:29:47,278 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:29:47,280 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:47,316 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:29:47,333 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:29:47,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:47,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:29:47,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:47,583 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:29:48,221 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:29:48,221 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2107804772] [2021-05-03 00:29:48,222 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2107804772] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:29:48,222 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:29:48,222 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-03 00:29:48,222 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997264119] [2021-05-03 00:29:48,222 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-03 00:29:48,222 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:29:48,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-03 00:29:48,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=232, Unknown=0, NotChecked=0, Total=342 [2021-05-03 00:29:48,223 INFO L87 Difference]: Start difference. First operand 99 states and 114 transitions. Second operand has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 17 states have internal predecessors, (55), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:49,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:29:49,170 INFO L93 Difference]: Finished difference Result 201 states and 235 transitions. [2021-05-03 00:29:49,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-03 00:29:49,171 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 17 states have internal predecessors, (55), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 70 [2021-05-03 00:29:49,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:29:49,172 INFO L225 Difference]: With dead ends: 201 [2021-05-03 00:29:49,172 INFO L226 Difference]: Without dead ends: 130 [2021-05-03 00:29:49,173 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 11 SyntacticMatches, 21 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 1210.8ms TimeCoverageRelationStatistics Valid=286, Invalid=770, Unknown=0, NotChecked=0, Total=1056 [2021-05-03 00:29:49,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-05-03 00:29:49,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 102. [2021-05-03 00:29:49,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 98 states have (on average 1.163265306122449) internal successors, (114), 98 states have internal predecessors, (114), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:49,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 117 transitions. [2021-05-03 00:29:49,203 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 117 transitions. Word has length 70 [2021-05-03 00:29:49,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:29:49,204 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 117 transitions. [2021-05-03 00:29:49,204 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 17 states have internal predecessors, (55), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:49,204 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 117 transitions. [2021-05-03 00:29:49,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-03 00:29:49,205 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:29:49,205 INFO L523 BasicCegarLoop]: trace histogram [15, 14, 14, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:29:49,205 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-05-03 00:29:49,205 INFO L428 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:29:49,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:29:49,206 INFO L82 PathProgramCache]: Analyzing trace with hash 1275771068, now seen corresponding path program 8 times [2021-05-03 00:29:49,206 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:29:49,206 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1576102288] [2021-05-03 00:29:49,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:29:49,216 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:29:49,217 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:49,251 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:29:49,267 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:29:49,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:49,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:29:49,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:49,491 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:29:50,196 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:29:50,196 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1576102288] [2021-05-03 00:29:50,196 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1576102288] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:29:50,197 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:29:50,197 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-03 00:29:50,197 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361126205] [2021-05-03 00:29:50,197 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-03 00:29:50,197 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:29:50,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-03 00:29:50,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2021-05-03 00:29:50,198 INFO L87 Difference]: Start difference. First operand 102 states and 117 transitions. Second operand has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:51,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:29:51,270 INFO L93 Difference]: Finished difference Result 204 states and 238 transitions. [2021-05-03 00:29:51,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-03 00:29:51,271 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 73 [2021-05-03 00:29:51,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:29:51,272 INFO L225 Difference]: With dead ends: 204 [2021-05-03 00:29:51,272 INFO L226 Difference]: Without dead ends: 133 [2021-05-03 00:29:51,273 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 11 SyntacticMatches, 23 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 1357.1ms TimeCoverageRelationStatistics Valid=308, Invalid=882, Unknown=0, NotChecked=0, Total=1190 [2021-05-03 00:29:51,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-05-03 00:29:51,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 105. [2021-05-03 00:29:51,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 101 states have (on average 1.1584158415841583) internal successors, (117), 101 states have internal predecessors, (117), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:51,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 120 transitions. [2021-05-03 00:29:51,303 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 120 transitions. Word has length 73 [2021-05-03 00:29:51,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:29:51,304 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 120 transitions. [2021-05-03 00:29:51,304 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:51,304 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 120 transitions. [2021-05-03 00:29:51,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-03 00:29:51,305 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:29:51,305 INFO L523 BasicCegarLoop]: trace histogram [16, 15, 15, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:29:51,305 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-05-03 00:29:51,305 INFO L428 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:29:51,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:29:51,306 INFO L82 PathProgramCache]: Analyzing trace with hash -1192159685, now seen corresponding path program 9 times [2021-05-03 00:29:51,306 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:29:51,306 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [116869006] [2021-05-03 00:29:51,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:29:51,318 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:29:51,320 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:51,352 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:29:51,370 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:29:51,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:51,578 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:29:51,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:51,584 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:29:52,385 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:29:52,385 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [116869006] [2021-05-03 00:29:52,385 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [116869006] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:29:52,385 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:29:52,385 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-03 00:29:52,385 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931066959] [2021-05-03 00:29:52,385 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-03 00:29:52,386 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:29:52,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-03 00:29:52,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=294, Unknown=0, NotChecked=0, Total=420 [2021-05-03 00:29:52,387 INFO L87 Difference]: Start difference. First operand 105 states and 120 transitions. Second operand has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:53,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:29:53,645 INFO L93 Difference]: Finished difference Result 207 states and 241 transitions. [2021-05-03 00:29:53,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-03 00:29:53,646 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 76 [2021-05-03 00:29:53,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:29:53,647 INFO L225 Difference]: With dead ends: 207 [2021-05-03 00:29:53,647 INFO L226 Difference]: Without dead ends: 136 [2021-05-03 00:29:53,648 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 11 SyntacticMatches, 25 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 1526.6ms TimeCoverageRelationStatistics Valid=330, Invalid=1002, Unknown=0, NotChecked=0, Total=1332 [2021-05-03 00:29:53,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-05-03 00:29:53,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 108. [2021-05-03 00:29:53,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 104 states have (on average 1.1538461538461537) internal successors, (120), 104 states have internal predecessors, (120), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:53,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 123 transitions. [2021-05-03 00:29:53,686 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 123 transitions. Word has length 76 [2021-05-03 00:29:53,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:29:53,687 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 123 transitions. [2021-05-03 00:29:53,687 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:53,687 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 123 transitions. [2021-05-03 00:29:53,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-03 00:29:53,688 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:29:53,688 INFO L523 BasicCegarLoop]: trace histogram [17, 16, 16, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:29:53,688 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-03 00:29:53,688 INFO L428 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:29:53,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:29:53,689 INFO L82 PathProgramCache]: Analyzing trace with hash -2067049380, now seen corresponding path program 10 times [2021-05-03 00:29:53,689 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:29:53,689 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1054614589] [2021-05-03 00:29:53,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:29:53,702 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:29:53,703 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:53,738 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:29:53,755 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:29:53,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:53,956 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:29:53,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:53,964 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:29:54,794 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:29:54,795 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1054614589] [2021-05-03 00:29:54,795 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1054614589] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:29:54,795 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:29:54,795 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-03 00:29:54,795 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026954262] [2021-05-03 00:29:54,795 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-03 00:29:54,795 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:29:54,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-03 00:29:54,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=328, Unknown=0, NotChecked=0, Total=462 [2021-05-03 00:29:54,796 INFO L87 Difference]: Start difference. First operand 108 states and 123 transitions. Second operand has 21 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 20 states have internal predecessors, (64), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:55,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:29:55,928 INFO L93 Difference]: Finished difference Result 210 states and 244 transitions. [2021-05-03 00:29:55,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-03 00:29:55,929 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 20 states have internal predecessors, (64), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 79 [2021-05-03 00:29:55,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:29:55,930 INFO L225 Difference]: With dead ends: 210 [2021-05-03 00:29:55,930 INFO L226 Difference]: Without dead ends: 139 [2021-05-03 00:29:55,931 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 11 SyntacticMatches, 27 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 282 ImplicationChecksByTransitivity, 1512.0ms TimeCoverageRelationStatistics Valid=352, Invalid=1130, Unknown=0, NotChecked=0, Total=1482 [2021-05-03 00:29:55,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-05-03 00:29:55,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 111. [2021-05-03 00:29:55,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 107 states have (on average 1.1495327102803738) internal successors, (123), 107 states have internal predecessors, (123), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:55,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 126 transitions. [2021-05-03 00:29:55,966 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 126 transitions. Word has length 79 [2021-05-03 00:29:55,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:29:55,967 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 126 transitions. [2021-05-03 00:29:55,967 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 20 states have internal predecessors, (64), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:55,967 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 126 transitions. [2021-05-03 00:29:55,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-03 00:29:55,968 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:29:55,968 INFO L523 BasicCegarLoop]: trace histogram [18, 17, 17, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:29:55,968 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-05-03 00:29:55,968 INFO L428 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:29:55,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:29:55,968 INFO L82 PathProgramCache]: Analyzing trace with hash 250566299, now seen corresponding path program 11 times [2021-05-03 00:29:55,968 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:29:55,968 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1927012227] [2021-05-03 00:29:55,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:29:55,980 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:29:55,981 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:56,005 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:29:56,020 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:29:56,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:56,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:29:56,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:56,195 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:29:57,007 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:29:57,008 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1927012227] [2021-05-03 00:29:57,008 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1927012227] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:29:57,008 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:29:57,008 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-03 00:29:57,008 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202977253] [2021-05-03 00:29:57,008 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-03 00:29:57,008 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:29:57,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-03 00:29:57,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=364, Unknown=0, NotChecked=0, Total=506 [2021-05-03 00:29:57,009 INFO L87 Difference]: Start difference. First operand 111 states and 126 transitions. Second operand has 22 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 21 states have internal predecessors, (67), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:58,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:29:58,247 INFO L93 Difference]: Finished difference Result 213 states and 247 transitions. [2021-05-03 00:29:58,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-03 00:29:58,248 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 21 states have internal predecessors, (67), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 82 [2021-05-03 00:29:58,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:29:58,249 INFO L225 Difference]: With dead ends: 213 [2021-05-03 00:29:58,249 INFO L226 Difference]: Without dead ends: 142 [2021-05-03 00:29:58,250 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 11 SyntacticMatches, 29 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 1520.1ms TimeCoverageRelationStatistics Valid=374, Invalid=1266, Unknown=0, NotChecked=0, Total=1640 [2021-05-03 00:29:58,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-05-03 00:29:58,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 114. [2021-05-03 00:29:58,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 110 states have (on average 1.1454545454545455) internal successors, (126), 110 states have internal predecessors, (126), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:58,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 129 transitions. [2021-05-03 00:29:58,301 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 129 transitions. Word has length 82 [2021-05-03 00:29:58,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:29:58,301 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 129 transitions. [2021-05-03 00:29:58,301 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 21 states have internal predecessors, (67), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:29:58,301 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 129 transitions. [2021-05-03 00:29:58,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-03 00:29:58,302 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:29:58,302 INFO L523 BasicCegarLoop]: trace histogram [19, 18, 18, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:29:58,302 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-05-03 00:29:58,302 INFO L428 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:29:58,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:29:58,303 INFO L82 PathProgramCache]: Analyzing trace with hash -1554991108, now seen corresponding path program 12 times [2021-05-03 00:29:58,303 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:29:58,303 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1437142903] [2021-05-03 00:29:58,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:29:58,319 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:29:58,320 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:29:58,349 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:29:58,364 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:29:58,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:58,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:29:58,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:29:58,540 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:29:59,485 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:29:59,485 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1437142903] [2021-05-03 00:29:59,486 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1437142903] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:29:59,486 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:29:59,486 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-03 00:29:59,486 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422643673] [2021-05-03 00:29:59,486 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-03 00:29:59,486 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:29:59,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-03 00:29:59,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=402, Unknown=0, NotChecked=0, Total=552 [2021-05-03 00:29:59,487 INFO L87 Difference]: Start difference. First operand 114 states and 129 transitions. Second operand has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 22 states have internal predecessors, (70), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:00,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:30:00,766 INFO L93 Difference]: Finished difference Result 216 states and 250 transitions. [2021-05-03 00:30:00,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-03 00:30:00,766 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 22 states have internal predecessors, (70), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 85 [2021-05-03 00:30:00,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:30:00,767 INFO L225 Difference]: With dead ends: 216 [2021-05-03 00:30:00,767 INFO L226 Difference]: Without dead ends: 145 [2021-05-03 00:30:00,768 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 11 SyntacticMatches, 31 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 1685.3ms TimeCoverageRelationStatistics Valid=396, Invalid=1410, Unknown=0, NotChecked=0, Total=1806 [2021-05-03 00:30:00,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2021-05-03 00:30:00,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 117. [2021-05-03 00:30:00,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 113 states have (on average 1.1415929203539823) internal successors, (129), 113 states have internal predecessors, (129), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:00,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 132 transitions. [2021-05-03 00:30:00,807 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 132 transitions. Word has length 85 [2021-05-03 00:30:00,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:30:00,807 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 132 transitions. [2021-05-03 00:30:00,808 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 22 states have internal predecessors, (70), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:00,808 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 132 transitions. [2021-05-03 00:30:00,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-03 00:30:00,808 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:30:00,808 INFO L523 BasicCegarLoop]: trace histogram [20, 19, 19, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:30:00,809 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-05-03 00:30:00,809 INFO L428 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:30:00,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:30:00,809 INFO L82 PathProgramCache]: Analyzing trace with hash -745287941, now seen corresponding path program 13 times [2021-05-03 00:30:00,809 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:30:00,809 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1455415030] [2021-05-03 00:30:00,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:30:00,821 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:30:00,822 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:30:00,849 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:30:00,863 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:30:00,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:01,014 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:30:01,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:01,021 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:30:02,064 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:30:02,064 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1455415030] [2021-05-03 00:30:02,064 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1455415030] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:30:02,064 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:30:02,064 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-03 00:30:02,065 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227117240] [2021-05-03 00:30:02,065 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-03 00:30:02,065 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:30:02,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-03 00:30:02,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2021-05-03 00:30:02,066 INFO L87 Difference]: Start difference. First operand 117 states and 132 transitions. Second operand has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:03,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:30:03,547 INFO L93 Difference]: Finished difference Result 219 states and 253 transitions. [2021-05-03 00:30:03,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-03 00:30:03,548 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 88 [2021-05-03 00:30:03,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:30:03,549 INFO L225 Difference]: With dead ends: 219 [2021-05-03 00:30:03,549 INFO L226 Difference]: Without dead ends: 148 [2021-05-03 00:30:03,550 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 11 SyntacticMatches, 33 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 369 ImplicationChecksByTransitivity, 1826.1ms TimeCoverageRelationStatistics Valid=418, Invalid=1562, Unknown=0, NotChecked=0, Total=1980 [2021-05-03 00:30:03,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-05-03 00:30:03,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 120. [2021-05-03 00:30:03,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 116 states have (on average 1.1379310344827587) internal successors, (132), 116 states have internal predecessors, (132), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:03,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 135 transitions. [2021-05-03 00:30:03,615 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 135 transitions. Word has length 88 [2021-05-03 00:30:03,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:30:03,615 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 135 transitions. [2021-05-03 00:30:03,616 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:03,616 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 135 transitions. [2021-05-03 00:30:03,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-03 00:30:03,616 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:30:03,617 INFO L523 BasicCegarLoop]: trace histogram [21, 20, 20, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:30:03,617 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-05-03 00:30:03,617 INFO L428 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:30:03,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:30:03,618 INFO L82 PathProgramCache]: Analyzing trace with hash 585425820, now seen corresponding path program 14 times [2021-05-03 00:30:03,618 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:30:03,618 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1661008627] [2021-05-03 00:30:03,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:30:03,638 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:30:03,639 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:30:03,674 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:30:03,693 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:30:03,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:03,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:30:03,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:03,898 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:30:05,288 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:30:05,288 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1661008627] [2021-05-03 00:30:05,288 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1661008627] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:30:05,288 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:30:05,289 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-03 00:30:05,289 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385348354] [2021-05-03 00:30:05,289 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-03 00:30:05,289 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:30:05,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-03 00:30:05,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=484, Unknown=0, NotChecked=0, Total=650 [2021-05-03 00:30:05,290 INFO L87 Difference]: Start difference. First operand 120 states and 135 transitions. Second operand has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 states have internal predecessors, (76), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:07,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:30:07,149 INFO L93 Difference]: Finished difference Result 222 states and 256 transitions. [2021-05-03 00:30:07,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-03 00:30:07,149 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 states have internal predecessors, (76), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 91 [2021-05-03 00:30:07,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:30:07,150 INFO L225 Difference]: With dead ends: 222 [2021-05-03 00:30:07,150 INFO L226 Difference]: Without dead ends: 151 [2021-05-03 00:30:07,151 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 11 SyntacticMatches, 35 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 400 ImplicationChecksByTransitivity, 2371.2ms TimeCoverageRelationStatistics Valid=440, Invalid=1722, Unknown=0, NotChecked=0, Total=2162 [2021-05-03 00:30:07,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-05-03 00:30:07,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 123. [2021-05-03 00:30:07,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 119 states have (on average 1.134453781512605) internal successors, (135), 119 states have internal predecessors, (135), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:07,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 138 transitions. [2021-05-03 00:30:07,211 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 138 transitions. Word has length 91 [2021-05-03 00:30:07,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:30:07,211 INFO L480 AbstractCegarLoop]: Abstraction has 123 states and 138 transitions. [2021-05-03 00:30:07,212 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 states have internal predecessors, (76), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:07,212 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 138 transitions. [2021-05-03 00:30:07,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-03 00:30:07,213 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:30:07,213 INFO L523 BasicCegarLoop]: trace histogram [22, 21, 21, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:30:07,213 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-05-03 00:30:07,213 INFO L428 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:30:07,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:30:07,214 INFO L82 PathProgramCache]: Analyzing trace with hash 1330937691, now seen corresponding path program 15 times [2021-05-03 00:30:07,214 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:30:07,214 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1316960632] [2021-05-03 00:30:07,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:30:07,230 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:30:07,231 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:30:07,265 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:30:07,284 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:30:07,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:07,480 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:30:07,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:07,484 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:30:08,784 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:30:08,785 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1316960632] [2021-05-03 00:30:08,785 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1316960632] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:30:08,785 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:30:08,785 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-03 00:30:08,785 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278002053] [2021-05-03 00:30:08,785 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-03 00:30:08,785 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:30:08,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-03 00:30:08,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=528, Unknown=0, NotChecked=0, Total=702 [2021-05-03 00:30:08,786 INFO L87 Difference]: Start difference. First operand 123 states and 138 transitions. Second operand has 26 states, 26 states have (on average 3.0384615384615383) internal successors, (79), 25 states have internal predecessors, (79), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:10,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:30:10,396 INFO L93 Difference]: Finished difference Result 225 states and 259 transitions. [2021-05-03 00:30:10,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-03 00:30:10,396 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.0384615384615383) internal successors, (79), 25 states have internal predecessors, (79), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 94 [2021-05-03 00:30:10,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:30:10,397 INFO L225 Difference]: With dead ends: 225 [2021-05-03 00:30:10,397 INFO L226 Difference]: Without dead ends: 154 [2021-05-03 00:30:10,397 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 11 SyntacticMatches, 37 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 2180.0ms TimeCoverageRelationStatistics Valid=462, Invalid=1890, Unknown=0, NotChecked=0, Total=2352 [2021-05-03 00:30:10,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-05-03 00:30:10,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 126. [2021-05-03 00:30:10,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 122 states have (on average 1.1311475409836065) internal successors, (138), 122 states have internal predecessors, (138), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:10,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 141 transitions. [2021-05-03 00:30:10,451 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 141 transitions. Word has length 94 [2021-05-03 00:30:10,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:30:10,451 INFO L480 AbstractCegarLoop]: Abstraction has 126 states and 141 transitions. [2021-05-03 00:30:10,451 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 3.0384615384615383) internal successors, (79), 25 states have internal predecessors, (79), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:10,452 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 141 transitions. [2021-05-03 00:30:10,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-03 00:30:10,452 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:30:10,452 INFO L523 BasicCegarLoop]: trace histogram [23, 22, 22, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:30:10,452 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-05-03 00:30:10,452 INFO L428 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:30:10,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:30:10,453 INFO L82 PathProgramCache]: Analyzing trace with hash 1599199036, now seen corresponding path program 16 times [2021-05-03 00:30:10,453 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:30:10,453 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [791958216] [2021-05-03 00:30:10,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:30:10,466 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:30:10,467 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:30:10,494 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:30:10,509 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:30:10,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:10,656 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:30:10,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:10,665 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:30:11,958 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:30:11,958 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [791958216] [2021-05-03 00:30:11,958 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [791958216] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:30:11,958 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:30:11,958 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-03 00:30:11,958 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1695581103] [2021-05-03 00:30:11,958 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-03 00:30:11,958 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:30:11,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-03 00:30:11,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=574, Unknown=0, NotChecked=0, Total=756 [2021-05-03 00:30:11,959 INFO L87 Difference]: Start difference. First operand 126 states and 141 transitions. Second operand has 27 states, 27 states have (on average 3.037037037037037) internal successors, (82), 26 states have internal predecessors, (82), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:13,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:30:13,711 INFO L93 Difference]: Finished difference Result 228 states and 262 transitions. [2021-05-03 00:30:13,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-03 00:30:13,711 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.037037037037037) internal successors, (82), 26 states have internal predecessors, (82), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 97 [2021-05-03 00:30:13,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:30:13,713 INFO L225 Difference]: With dead ends: 228 [2021-05-03 00:30:13,713 INFO L226 Difference]: Without dead ends: 157 [2021-05-03 00:30:13,714 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 11 SyntacticMatches, 39 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 465 ImplicationChecksByTransitivity, 2218.8ms TimeCoverageRelationStatistics Valid=484, Invalid=2066, Unknown=0, NotChecked=0, Total=2550 [2021-05-03 00:30:13,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-05-03 00:30:13,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 129. [2021-05-03 00:30:13,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 125 states have (on average 1.128) internal successors, (141), 125 states have internal predecessors, (141), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:13,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 144 transitions. [2021-05-03 00:30:13,770 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 144 transitions. Word has length 97 [2021-05-03 00:30:13,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:30:13,770 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 144 transitions. [2021-05-03 00:30:13,770 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 3.037037037037037) internal successors, (82), 26 states have internal predecessors, (82), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:13,770 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 144 transitions. [2021-05-03 00:30:13,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-05-03 00:30:13,771 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:30:13,771 INFO L523 BasicCegarLoop]: trace histogram [24, 23, 23, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:30:13,771 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-05-03 00:30:13,771 INFO L428 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:30:13,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:30:13,771 INFO L82 PathProgramCache]: Analyzing trace with hash 438790075, now seen corresponding path program 17 times [2021-05-03 00:30:13,772 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:30:13,772 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1117615023] [2021-05-03 00:30:13,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:30:13,785 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:30:13,786 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:30:13,817 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:30:13,832 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:30:13,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:13,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:30:13,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:13,990 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:30:15,328 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:30:15,328 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1117615023] [2021-05-03 00:30:15,328 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1117615023] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:30:15,328 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:30:15,329 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-03 00:30:15,329 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422666564] [2021-05-03 00:30:15,329 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-03 00:30:15,329 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:30:15,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-03 00:30:15,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=622, Unknown=0, NotChecked=0, Total=812 [2021-05-03 00:30:15,330 INFO L87 Difference]: Start difference. First operand 129 states and 144 transitions. Second operand has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:17,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:30:17,184 INFO L93 Difference]: Finished difference Result 231 states and 265 transitions. [2021-05-03 00:30:17,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-03 00:30:17,186 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 100 [2021-05-03 00:30:17,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:30:17,187 INFO L225 Difference]: With dead ends: 231 [2021-05-03 00:30:17,187 INFO L226 Difference]: Without dead ends: 160 [2021-05-03 00:30:17,188 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 11 SyntacticMatches, 41 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 499 ImplicationChecksByTransitivity, 2322.2ms TimeCoverageRelationStatistics Valid=506, Invalid=2250, Unknown=0, NotChecked=0, Total=2756 [2021-05-03 00:30:17,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-05-03 00:30:17,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 132. [2021-05-03 00:30:17,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 128 states have (on average 1.125) internal successors, (144), 128 states have internal predecessors, (144), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:17,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 147 transitions. [2021-05-03 00:30:17,251 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 147 transitions. Word has length 100 [2021-05-03 00:30:17,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:30:17,251 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 147 transitions. [2021-05-03 00:30:17,251 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:17,251 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 147 transitions. [2021-05-03 00:30:17,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-05-03 00:30:17,252 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:30:17,252 INFO L523 BasicCegarLoop]: trace histogram [25, 24, 24, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:30:17,253 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-05-03 00:30:17,253 INFO L428 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:30:17,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:30:17,253 INFO L82 PathProgramCache]: Analyzing trace with hash 887198428, now seen corresponding path program 18 times [2021-05-03 00:30:17,253 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:30:17,253 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1682336371] [2021-05-03 00:30:17,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:30:17,271 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:30:17,272 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:30:17,299 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:30:17,313 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:30:17,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:17,484 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:30:17,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:17,489 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:30:18,951 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:30:18,951 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1682336371] [2021-05-03 00:30:18,951 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1682336371] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:30:18,951 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:30:18,951 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-03 00:30:18,951 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822170760] [2021-05-03 00:30:18,952 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-03 00:30:18,952 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:30:18,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-03 00:30:18,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=672, Unknown=0, NotChecked=0, Total=870 [2021-05-03 00:30:18,952 INFO L87 Difference]: Start difference. First operand 132 states and 147 transitions. Second operand has 29 states, 29 states have (on average 3.0344827586206895) internal successors, (88), 28 states have internal predecessors, (88), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:20,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:30:20,913 INFO L93 Difference]: Finished difference Result 234 states and 268 transitions. [2021-05-03 00:30:20,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-03 00:30:20,914 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 3.0344827586206895) internal successors, (88), 28 states have internal predecessors, (88), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 103 [2021-05-03 00:30:20,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:30:20,915 INFO L225 Difference]: With dead ends: 234 [2021-05-03 00:30:20,915 INFO L226 Difference]: Without dead ends: 163 [2021-05-03 00:30:20,915 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 11 SyntacticMatches, 43 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 534 ImplicationChecksByTransitivity, 2498.4ms TimeCoverageRelationStatistics Valid=528, Invalid=2442, Unknown=0, NotChecked=0, Total=2970 [2021-05-03 00:30:20,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2021-05-03 00:30:20,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 135. [2021-05-03 00:30:20,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 131 states have (on average 1.1221374045801527) internal successors, (147), 131 states have internal predecessors, (147), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:20,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 150 transitions. [2021-05-03 00:30:20,978 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 150 transitions. Word has length 103 [2021-05-03 00:30:20,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:30:20,978 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 150 transitions. [2021-05-03 00:30:20,978 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 3.0344827586206895) internal successors, (88), 28 states have internal predecessors, (88), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:20,978 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 150 transitions. [2021-05-03 00:30:20,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-05-03 00:30:20,979 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:30:20,979 INFO L523 BasicCegarLoop]: trace histogram [26, 25, 25, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:30:20,979 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-05-03 00:30:20,980 INFO L428 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:30:20,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:30:20,980 INFO L82 PathProgramCache]: Analyzing trace with hash 2072152091, now seen corresponding path program 19 times [2021-05-03 00:30:20,980 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:30:20,980 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [743686625] [2021-05-03 00:30:20,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:30:20,997 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:30:20,998 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:30:21,023 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:30:21,038 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:30:21,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:21,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:30:21,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:21,211 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:30:22,809 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:30:22,810 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [743686625] [2021-05-03 00:30:22,810 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [743686625] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:30:22,810 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:30:22,810 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-03 00:30:22,810 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522286935] [2021-05-03 00:30:22,810 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-03 00:30:22,810 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:30:22,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-03 00:30:22,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=724, Unknown=0, NotChecked=0, Total=930 [2021-05-03 00:30:22,811 INFO L87 Difference]: Start difference. First operand 135 states and 150 transitions. Second operand has 30 states, 30 states have (on average 3.033333333333333) internal successors, (91), 29 states have internal predecessors, (91), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:24,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:30:24,952 INFO L93 Difference]: Finished difference Result 237 states and 271 transitions. [2021-05-03 00:30:24,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-03 00:30:24,953 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.033333333333333) internal successors, (91), 29 states have internal predecessors, (91), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 106 [2021-05-03 00:30:24,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:30:24,954 INFO L225 Difference]: With dead ends: 237 [2021-05-03 00:30:24,954 INFO L226 Difference]: Without dead ends: 166 [2021-05-03 00:30:24,955 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 11 SyntacticMatches, 45 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 570 ImplicationChecksByTransitivity, 2705.7ms TimeCoverageRelationStatistics Valid=550, Invalid=2642, Unknown=0, NotChecked=0, Total=3192 [2021-05-03 00:30:24,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-05-03 00:30:25,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 138. [2021-05-03 00:30:25,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 134 states have (on average 1.1194029850746268) internal successors, (150), 134 states have internal predecessors, (150), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:25,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 153 transitions. [2021-05-03 00:30:25,044 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 153 transitions. Word has length 106 [2021-05-03 00:30:25,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:30:25,044 INFO L480 AbstractCegarLoop]: Abstraction has 138 states and 153 transitions. [2021-05-03 00:30:25,044 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 3.033333333333333) internal successors, (91), 29 states have internal predecessors, (91), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:25,044 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 153 transitions. [2021-05-03 00:30:25,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-05-03 00:30:25,045 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:30:25,045 INFO L523 BasicCegarLoop]: trace histogram [27, 26, 26, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:30:25,045 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-05-03 00:30:25,045 INFO L428 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:30:25,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:30:25,046 INFO L82 PathProgramCache]: Analyzing trace with hash -1604446596, now seen corresponding path program 20 times [2021-05-03 00:30:25,046 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:30:25,046 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1583456174] [2021-05-03 00:30:25,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:30:25,060 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:30:25,061 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:30:25,092 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:30:25,108 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:30:25,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:25,268 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:30:25,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:25,272 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:30:26,945 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:30:26,945 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1583456174] [2021-05-03 00:30:26,945 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1583456174] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:30:26,945 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:30:26,945 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-03 00:30:26,945 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957585197] [2021-05-03 00:30:26,946 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-03 00:30:26,946 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:30:26,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-03 00:30:26,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=778, Unknown=0, NotChecked=0, Total=992 [2021-05-03 00:30:26,946 INFO L87 Difference]: Start difference. First operand 138 states and 153 transitions. Second operand has 31 states, 31 states have (on average 3.032258064516129) internal successors, (94), 30 states have internal predecessors, (94), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:29,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:30:29,268 INFO L93 Difference]: Finished difference Result 240 states and 274 transitions. [2021-05-03 00:30:29,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-03 00:30:29,269 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 3.032258064516129) internal successors, (94), 30 states have internal predecessors, (94), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 109 [2021-05-03 00:30:29,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:30:29,270 INFO L225 Difference]: With dead ends: 240 [2021-05-03 00:30:29,270 INFO L226 Difference]: Without dead ends: 169 [2021-05-03 00:30:29,271 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 11 SyntacticMatches, 47 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 607 ImplicationChecksByTransitivity, 2833.3ms TimeCoverageRelationStatistics Valid=572, Invalid=2850, Unknown=0, NotChecked=0, Total=3422 [2021-05-03 00:30:29,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-05-03 00:30:29,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 141. [2021-05-03 00:30:29,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 137 states have (on average 1.1167883211678833) internal successors, (153), 137 states have internal predecessors, (153), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:29,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 156 transitions. [2021-05-03 00:30:29,350 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 156 transitions. Word has length 109 [2021-05-03 00:30:29,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:30:29,350 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 156 transitions. [2021-05-03 00:30:29,350 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 3.032258064516129) internal successors, (94), 30 states have internal predecessors, (94), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:29,351 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 156 transitions. [2021-05-03 00:30:29,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-05-03 00:30:29,351 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:30:29,352 INFO L523 BasicCegarLoop]: trace histogram [28, 27, 27, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:30:29,352 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-05-03 00:30:29,352 INFO L428 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:30:29,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:30:29,352 INFO L82 PathProgramCache]: Analyzing trace with hash -899948421, now seen corresponding path program 21 times [2021-05-03 00:30:29,352 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:30:29,352 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1143502732] [2021-05-03 00:30:29,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:30:29,369 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:30:29,370 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:30:29,398 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:30:29,413 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:30:29,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:29,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:30:29,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:29,581 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:30:31,400 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:30:31,401 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1143502732] [2021-05-03 00:30:31,401 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1143502732] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:30:31,401 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:30:31,401 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-03 00:30:31,401 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120333880] [2021-05-03 00:30:31,401 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-03 00:30:31,401 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:30:31,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-03 00:30:31,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=834, Unknown=0, NotChecked=0, Total=1056 [2021-05-03 00:30:31,403 INFO L87 Difference]: Start difference. First operand 141 states and 156 transitions. Second operand has 32 states, 32 states have (on average 3.03125) internal successors, (97), 31 states have internal predecessors, (97), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:34,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:30:34,089 INFO L93 Difference]: Finished difference Result 243 states and 277 transitions. [2021-05-03 00:30:34,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-03 00:30:34,090 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.03125) internal successors, (97), 31 states have internal predecessors, (97), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 112 [2021-05-03 00:30:34,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:30:34,091 INFO L225 Difference]: With dead ends: 243 [2021-05-03 00:30:34,091 INFO L226 Difference]: Without dead ends: 172 [2021-05-03 00:30:34,092 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 11 SyntacticMatches, 49 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 645 ImplicationChecksByTransitivity, 3108.0ms TimeCoverageRelationStatistics Valid=594, Invalid=3066, Unknown=0, NotChecked=0, Total=3660 [2021-05-03 00:30:34,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-05-03 00:30:34,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 144. [2021-05-03 00:30:34,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 140 states have (on average 1.1142857142857143) internal successors, (156), 140 states have internal predecessors, (156), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:34,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 159 transitions. [2021-05-03 00:30:34,178 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 159 transitions. Word has length 112 [2021-05-03 00:30:34,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:30:34,179 INFO L480 AbstractCegarLoop]: Abstraction has 144 states and 159 transitions. [2021-05-03 00:30:34,179 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 3.03125) internal successors, (97), 31 states have internal predecessors, (97), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:34,179 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 159 transitions. [2021-05-03 00:30:34,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-05-03 00:30:34,180 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:30:34,180 INFO L523 BasicCegarLoop]: trace histogram [29, 28, 28, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:30:34,180 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-05-03 00:30:34,180 INFO L428 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:30:34,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:30:34,180 INFO L82 PathProgramCache]: Analyzing trace with hash 1594974748, now seen corresponding path program 22 times [2021-05-03 00:30:34,181 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:30:34,181 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1116310201] [2021-05-03 00:30:34,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:30:34,199 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:30:34,200 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:30:34,226 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:30:34,241 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:30:34,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:34,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:30:34,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:34,401 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:30:36,370 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:30:36,371 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1116310201] [2021-05-03 00:30:36,371 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1116310201] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:30:36,371 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:30:36,371 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-03 00:30:36,371 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1857391400] [2021-05-03 00:30:36,371 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-03 00:30:36,371 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:30:36,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-03 00:30:36,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=892, Unknown=0, NotChecked=0, Total=1122 [2021-05-03 00:30:36,372 INFO L87 Difference]: Start difference. First operand 144 states and 159 transitions. Second operand has 33 states, 33 states have (on average 3.0303030303030303) internal successors, (100), 32 states have internal predecessors, (100), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:38,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:30:38,958 INFO L93 Difference]: Finished difference Result 246 states and 280 transitions. [2021-05-03 00:30:38,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-03 00:30:38,959 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 3.0303030303030303) internal successors, (100), 32 states have internal predecessors, (100), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 115 [2021-05-03 00:30:38,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:30:38,959 INFO L225 Difference]: With dead ends: 246 [2021-05-03 00:30:38,959 INFO L226 Difference]: Without dead ends: 175 [2021-05-03 00:30:38,961 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 11 SyntacticMatches, 51 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 684 ImplicationChecksByTransitivity, 3252.6ms TimeCoverageRelationStatistics Valid=616, Invalid=3290, Unknown=0, NotChecked=0, Total=3906 [2021-05-03 00:30:38,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2021-05-03 00:30:39,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 147. [2021-05-03 00:30:39,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 143 states have (on average 1.1118881118881119) internal successors, (159), 143 states have internal predecessors, (159), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:39,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 162 transitions. [2021-05-03 00:30:39,048 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 162 transitions. Word has length 115 [2021-05-03 00:30:39,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:30:39,048 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 162 transitions. [2021-05-03 00:30:39,048 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 3.0303030303030303) internal successors, (100), 32 states have internal predecessors, (100), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:39,048 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 162 transitions. [2021-05-03 00:30:39,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-05-03 00:30:39,049 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:30:39,049 INFO L523 BasicCegarLoop]: trace histogram [30, 29, 29, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:30:39,049 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-05-03 00:30:39,049 INFO L428 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:30:39,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:30:39,050 INFO L82 PathProgramCache]: Analyzing trace with hash -852922149, now seen corresponding path program 23 times [2021-05-03 00:30:39,050 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:30:39,050 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [438137547] [2021-05-03 00:30:39,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:30:39,074 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:30:39,075 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:30:39,103 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:30:39,120 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:30:39,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:39,291 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:30:39,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:39,295 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:30:41,408 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:30:41,409 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [438137547] [2021-05-03 00:30:41,409 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [438137547] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:30:41,409 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:30:41,409 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-03 00:30:41,409 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573057942] [2021-05-03 00:30:41,409 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-03 00:30:41,409 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:30:41,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-03 00:30:41,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=952, Unknown=0, NotChecked=0, Total=1190 [2021-05-03 00:30:41,410 INFO L87 Difference]: Start difference. First operand 147 states and 162 transitions. Second operand has 34 states, 34 states have (on average 3.0294117647058822) internal successors, (103), 33 states have internal predecessors, (103), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:44,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:30:44,291 INFO L93 Difference]: Finished difference Result 249 states and 283 transitions. [2021-05-03 00:30:44,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-03 00:30:44,291 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 3.0294117647058822) internal successors, (103), 33 states have internal predecessors, (103), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 118 [2021-05-03 00:30:44,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:30:44,292 INFO L225 Difference]: With dead ends: 249 [2021-05-03 00:30:44,292 INFO L226 Difference]: Without dead ends: 178 [2021-05-03 00:30:44,294 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 11 SyntacticMatches, 53 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 724 ImplicationChecksByTransitivity, 3487.1ms TimeCoverageRelationStatistics Valid=638, Invalid=3522, Unknown=0, NotChecked=0, Total=4160 [2021-05-03 00:30:44,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2021-05-03 00:30:44,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 150. [2021-05-03 00:30:44,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 146 states have (on average 1.1095890410958904) internal successors, (162), 146 states have internal predecessors, (162), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:44,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 165 transitions. [2021-05-03 00:30:44,385 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 165 transitions. Word has length 118 [2021-05-03 00:30:44,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:30:44,385 INFO L480 AbstractCegarLoop]: Abstraction has 150 states and 165 transitions. [2021-05-03 00:30:44,385 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 3.0294117647058822) internal successors, (103), 33 states have internal predecessors, (103), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:44,385 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 165 transitions. [2021-05-03 00:30:44,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-05-03 00:30:44,386 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:30:44,386 INFO L523 BasicCegarLoop]: trace histogram [31, 30, 30, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:30:44,386 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-05-03 00:30:44,387 INFO L428 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:30:44,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:30:44,387 INFO L82 PathProgramCache]: Analyzing trace with hash -1899661892, now seen corresponding path program 24 times [2021-05-03 00:30:44,387 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:30:44,387 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1479944603] [2021-05-03 00:30:44,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:30:44,410 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:30:44,412 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:30:44,440 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:30:44,455 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:30:44,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:44,637 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:30:44,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:44,641 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:30:46,925 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:30:46,926 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1479944603] [2021-05-03 00:30:46,926 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1479944603] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:30:46,926 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:30:46,926 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-03 00:30:46,926 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483203103] [2021-05-03 00:30:46,926 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-03 00:30:46,926 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:30:46,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-03 00:30:46,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=1014, Unknown=0, NotChecked=0, Total=1260 [2021-05-03 00:30:46,927 INFO L87 Difference]: Start difference. First operand 150 states and 165 transitions. Second operand has 35 states, 35 states have (on average 3.0285714285714285) internal successors, (106), 34 states have internal predecessors, (106), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:50,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:30:50,049 INFO L93 Difference]: Finished difference Result 252 states and 286 transitions. [2021-05-03 00:30:50,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-03 00:30:50,049 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.0285714285714285) internal successors, (106), 34 states have internal predecessors, (106), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 121 [2021-05-03 00:30:50,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:30:50,050 INFO L225 Difference]: With dead ends: 252 [2021-05-03 00:30:50,050 INFO L226 Difference]: Without dead ends: 181 [2021-05-03 00:30:50,051 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 11 SyntacticMatches, 55 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 765 ImplicationChecksByTransitivity, 3760.7ms TimeCoverageRelationStatistics Valid=660, Invalid=3762, Unknown=0, NotChecked=0, Total=4422 [2021-05-03 00:30:50,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2021-05-03 00:30:50,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 153. [2021-05-03 00:30:50,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 149 states have (on average 1.1073825503355705) internal successors, (165), 149 states have internal predecessors, (165), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:50,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 168 transitions. [2021-05-03 00:30:50,162 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 168 transitions. Word has length 121 [2021-05-03 00:30:50,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:30:50,162 INFO L480 AbstractCegarLoop]: Abstraction has 153 states and 168 transitions. [2021-05-03 00:30:50,163 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 3.0285714285714285) internal successors, (106), 34 states have internal predecessors, (106), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:50,163 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 168 transitions. [2021-05-03 00:30:50,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-05-03 00:30:50,163 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:30:50,163 INFO L523 BasicCegarLoop]: trace histogram [32, 31, 31, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:30:50,163 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-05-03 00:30:50,163 INFO L428 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:30:50,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:30:50,164 INFO L82 PathProgramCache]: Analyzing trace with hash 434190651, now seen corresponding path program 25 times [2021-05-03 00:30:50,164 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:30:50,164 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [550041814] [2021-05-03 00:30:50,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:30:50,184 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:30:50,185 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:30:50,212 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:30:50,228 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:30:50,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:50,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:30:50,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:50,407 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:30:53,068 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:30:53,069 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [550041814] [2021-05-03 00:30:53,069 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [550041814] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:30:53,069 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:30:53,069 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-03 00:30:53,069 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [113286400] [2021-05-03 00:30:53,069 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-03 00:30:53,069 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:30:53,070 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-03 00:30:53,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=1078, Unknown=0, NotChecked=0, Total=1332 [2021-05-03 00:30:53,070 INFO L87 Difference]: Start difference. First operand 153 states and 168 transitions. Second operand has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 35 states have internal predecessors, (109), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:56,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:30:56,823 INFO L93 Difference]: Finished difference Result 255 states and 289 transitions. [2021-05-03 00:30:56,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-03 00:30:56,824 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 35 states have internal predecessors, (109), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 124 [2021-05-03 00:30:56,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:30:56,825 INFO L225 Difference]: With dead ends: 255 [2021-05-03 00:30:56,825 INFO L226 Difference]: Without dead ends: 184 [2021-05-03 00:30:56,827 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 11 SyntacticMatches, 57 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 807 ImplicationChecksByTransitivity, 4435.4ms TimeCoverageRelationStatistics Valid=682, Invalid=4010, Unknown=0, NotChecked=0, Total=4692 [2021-05-03 00:30:56,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2021-05-03 00:30:56,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 156. [2021-05-03 00:30:56,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 152 states have (on average 1.105263157894737) internal successors, (168), 152 states have internal predecessors, (168), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:56,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 171 transitions. [2021-05-03 00:30:56,953 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 171 transitions. Word has length 124 [2021-05-03 00:30:56,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:30:56,953 INFO L480 AbstractCegarLoop]: Abstraction has 156 states and 171 transitions. [2021-05-03 00:30:56,954 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 35 states have internal predecessors, (109), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:30:56,954 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 171 transitions. [2021-05-03 00:30:56,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-05-03 00:30:56,954 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:30:56,954 INFO L523 BasicCegarLoop]: trace histogram [33, 32, 32, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:30:56,954 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-05-03 00:30:56,954 INFO L428 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:30:56,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:30:56,955 INFO L82 PathProgramCache]: Analyzing trace with hash 1304711516, now seen corresponding path program 26 times [2021-05-03 00:30:56,955 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:30:56,955 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [293846023] [2021-05-03 00:30:56,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:30:56,980 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:30:56,982 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:30:57,016 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:30:57,035 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:30:57,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:57,245 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:30:57,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:30:57,259 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:31:00,541 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:31:00,542 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [293846023] [2021-05-03 00:31:00,542 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [293846023] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:31:00,542 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:31:00,542 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-03 00:31:00,542 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1546584182] [2021-05-03 00:31:00,543 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-03 00:31:00,543 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:31:00,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-03 00:31:00,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=262, Invalid=1144, Unknown=0, NotChecked=0, Total=1406 [2021-05-03 00:31:00,544 INFO L87 Difference]: Start difference. First operand 156 states and 171 transitions. Second operand has 37 states, 37 states have (on average 3.027027027027027) internal successors, (112), 36 states have internal predecessors, (112), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:31:04,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:31:04,641 INFO L93 Difference]: Finished difference Result 258 states and 292 transitions. [2021-05-03 00:31:04,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-03 00:31:04,642 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.027027027027027) internal successors, (112), 36 states have internal predecessors, (112), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 127 [2021-05-03 00:31:04,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:31:04,643 INFO L225 Difference]: With dead ends: 258 [2021-05-03 00:31:04,643 INFO L226 Difference]: Without dead ends: 187 [2021-05-03 00:31:04,644 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 11 SyntacticMatches, 59 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 850 ImplicationChecksByTransitivity, 5160.8ms TimeCoverageRelationStatistics Valid=704, Invalid=4266, Unknown=0, NotChecked=0, Total=4970 [2021-05-03 00:31:04,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-05-03 00:31:04,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 159. [2021-05-03 00:31:04,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 155 states have (on average 1.103225806451613) internal successors, (171), 155 states have internal predecessors, (171), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:31:04,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 174 transitions. [2021-05-03 00:31:04,766 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 174 transitions. Word has length 127 [2021-05-03 00:31:04,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:31:04,766 INFO L480 AbstractCegarLoop]: Abstraction has 159 states and 174 transitions. [2021-05-03 00:31:04,766 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 3.027027027027027) internal successors, (112), 36 states have internal predecessors, (112), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:31:04,766 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 174 transitions. [2021-05-03 00:31:04,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-05-03 00:31:04,767 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:31:04,767 INFO L523 BasicCegarLoop]: trace histogram [34, 33, 33, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:31:04,767 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-05-03 00:31:04,767 INFO L428 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:31:04,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:31:04,768 INFO L82 PathProgramCache]: Analyzing trace with hash 1979267483, now seen corresponding path program 27 times [2021-05-03 00:31:04,768 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:31:04,768 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [347425221] [2021-05-03 00:31:04,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:31:04,790 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:31:04,792 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:31:04,838 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:31:04,862 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:31:04,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:31:05,129 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:31:05,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:31:05,137 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:31:09,464 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:31:09,464 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [347425221] [2021-05-03 00:31:09,464 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [347425221] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:31:09,465 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:31:09,465 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-03 00:31:09,465 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216448502] [2021-05-03 00:31:09,465 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-03 00:31:09,465 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:31:09,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-03 00:31:09,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=270, Invalid=1212, Unknown=0, NotChecked=0, Total=1482 [2021-05-03 00:31:09,466 INFO L87 Difference]: Start difference. First operand 159 states and 174 transitions. Second operand has 38 states, 38 states have (on average 3.026315789473684) internal successors, (115), 37 states have internal predecessors, (115), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:31:13,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:31:13,172 INFO L93 Difference]: Finished difference Result 261 states and 295 transitions. [2021-05-03 00:31:13,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-03 00:31:13,173 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.026315789473684) internal successors, (115), 37 states have internal predecessors, (115), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 130 [2021-05-03 00:31:13,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:31:13,173 INFO L225 Difference]: With dead ends: 261 [2021-05-03 00:31:13,173 INFO L226 Difference]: Without dead ends: 190 [2021-05-03 00:31:13,174 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 11 SyntacticMatches, 61 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 894 ImplicationChecksByTransitivity, 6111.7ms TimeCoverageRelationStatistics Valid=726, Invalid=4530, Unknown=0, NotChecked=0, Total=5256 [2021-05-03 00:31:13,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-05-03 00:31:13,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 162. [2021-05-03 00:31:13,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 158 states have (on average 1.1012658227848102) internal successors, (174), 158 states have internal predecessors, (174), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:31:13,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 177 transitions. [2021-05-03 00:31:13,306 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 177 transitions. Word has length 130 [2021-05-03 00:31:13,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:31:13,306 INFO L480 AbstractCegarLoop]: Abstraction has 162 states and 177 transitions. [2021-05-03 00:31:13,306 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 3.026315789473684) internal successors, (115), 37 states have internal predecessors, (115), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:31:13,306 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 177 transitions. [2021-05-03 00:31:13,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-05-03 00:31:13,307 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:31:13,307 INFO L523 BasicCegarLoop]: trace histogram [35, 34, 34, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:31:13,307 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-05-03 00:31:13,307 INFO L428 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:31:13,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:31:13,307 INFO L82 PathProgramCache]: Analyzing trace with hash 1524102396, now seen corresponding path program 28 times [2021-05-03 00:31:13,307 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:31:13,308 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [68893524] [2021-05-03 00:31:13,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:31:13,326 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:31:13,331 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:31:13,359 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:31:13,376 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:31:13,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:31:13,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:31:13,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:31:13,569 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:31:16,545 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:31:16,545 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [68893524] [2021-05-03 00:31:16,545 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [68893524] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:31:16,545 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:31:16,545 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-03 00:31:16,545 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707464144] [2021-05-03 00:31:16,546 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-03 00:31:16,546 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:31:16,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-03 00:31:16,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=1282, Unknown=0, NotChecked=0, Total=1560 [2021-05-03 00:31:16,546 INFO L87 Difference]: Start difference. First operand 162 states and 177 transitions. Second operand has 39 states, 39 states have (on average 3.0256410256410255) internal successors, (118), 38 states have internal predecessors, (118), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:31:20,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:31:20,480 INFO L93 Difference]: Finished difference Result 264 states and 298 transitions. [2021-05-03 00:31:20,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-03 00:31:20,481 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 3.0256410256410255) internal successors, (118), 38 states have internal predecessors, (118), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 133 [2021-05-03 00:31:20,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:31:20,482 INFO L225 Difference]: With dead ends: 264 [2021-05-03 00:31:20,482 INFO L226 Difference]: Without dead ends: 193 [2021-05-03 00:31:20,483 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 11 SyntacticMatches, 63 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 939 ImplicationChecksByTransitivity, 4777.7ms TimeCoverageRelationStatistics Valid=748, Invalid=4802, Unknown=0, NotChecked=0, Total=5550 [2021-05-03 00:31:20,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-05-03 00:31:20,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 165. [2021-05-03 00:31:20,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 161 states have (on average 1.0993788819875776) internal successors, (177), 161 states have internal predecessors, (177), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:31:20,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 180 transitions. [2021-05-03 00:31:20,662 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 180 transitions. Word has length 133 [2021-05-03 00:31:20,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:31:20,662 INFO L480 AbstractCegarLoop]: Abstraction has 165 states and 180 transitions. [2021-05-03 00:31:20,663 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 3.0256410256410255) internal successors, (118), 38 states have internal predecessors, (118), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:31:20,663 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 180 transitions. [2021-05-03 00:31:20,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-05-03 00:31:20,663 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:31:20,663 INFO L523 BasicCegarLoop]: trace histogram [36, 35, 35, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:31:20,664 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2021-05-03 00:31:20,664 INFO L428 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:31:20,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:31:20,664 INFO L82 PathProgramCache]: Analyzing trace with hash 912749051, now seen corresponding path program 29 times [2021-05-03 00:31:20,664 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:31:20,664 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [708057211] [2021-05-03 00:31:20,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:31:20,687 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:31:20,689 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:31:20,722 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:31:20,741 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:31:20,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:31:20,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:31:20,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:31:20,933 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:31:24,115 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:31:24,115 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [708057211] [2021-05-03 00:31:24,115 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [708057211] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:31:24,115 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:31:24,115 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-03 00:31:24,115 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [767612408] [2021-05-03 00:31:24,116 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-03 00:31:24,116 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:31:24,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-03 00:31:24,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=1354, Unknown=0, NotChecked=0, Total=1640 [2021-05-03 00:31:24,116 INFO L87 Difference]: Start difference. First operand 165 states and 180 transitions. Second operand has 40 states, 40 states have (on average 3.025) internal successors, (121), 39 states have internal predecessors, (121), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:31:29,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:31:29,829 INFO L93 Difference]: Finished difference Result 267 states and 301 transitions. [2021-05-03 00:31:29,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-03 00:31:29,830 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 3.025) internal successors, (121), 39 states have internal predecessors, (121), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 136 [2021-05-03 00:31:29,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:31:29,831 INFO L225 Difference]: With dead ends: 267 [2021-05-03 00:31:29,831 INFO L226 Difference]: Without dead ends: 196 [2021-05-03 00:31:29,832 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 11 SyntacticMatches, 65 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 985 ImplicationChecksByTransitivity, 5644.9ms TimeCoverageRelationStatistics Valid=770, Invalid=5082, Unknown=0, NotChecked=0, Total=5852 [2021-05-03 00:31:29,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-05-03 00:31:29,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 168. [2021-05-03 00:31:29,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 164 states have (on average 1.0975609756097562) internal successors, (180), 164 states have internal predecessors, (180), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:31:29,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 183 transitions. [2021-05-03 00:31:29,974 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 183 transitions. Word has length 136 [2021-05-03 00:31:29,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:31:29,974 INFO L480 AbstractCegarLoop]: Abstraction has 168 states and 183 transitions. [2021-05-03 00:31:29,974 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 3.025) internal successors, (121), 39 states have internal predecessors, (121), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:31:29,975 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 183 transitions. [2021-05-03 00:31:29,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-05-03 00:31:29,975 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:31:29,975 INFO L523 BasicCegarLoop]: trace histogram [37, 36, 36, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:31:29,975 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-05-03 00:31:29,975 INFO L428 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:31:29,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:31:29,976 INFO L82 PathProgramCache]: Analyzing trace with hash -1253416804, now seen corresponding path program 30 times [2021-05-03 00:31:29,976 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:31:29,976 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1806071121] [2021-05-03 00:31:29,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:31:30,003 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:31:30,005 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:31:30,055 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:31:30,086 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:31:30,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:31:30,394 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:31:30,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:31:30,399 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:31:35,832 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:31:35,832 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1806071121] [2021-05-03 00:31:35,832 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1806071121] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:31:35,832 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:31:35,832 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-03 00:31:35,833 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669614060] [2021-05-03 00:31:35,833 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-03 00:31:35,833 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:31:35,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-03 00:31:35,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=1428, Unknown=0, NotChecked=0, Total=1722 [2021-05-03 00:31:35,834 INFO L87 Difference]: Start difference. First operand 168 states and 183 transitions. Second operand has 41 states, 41 states have (on average 3.024390243902439) internal successors, (124), 40 states have internal predecessors, (124), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:31:41,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:31:41,549 INFO L93 Difference]: Finished difference Result 270 states and 304 transitions. [2021-05-03 00:31:41,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-03 00:31:41,550 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 3.024390243902439) internal successors, (124), 40 states have internal predecessors, (124), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 139 [2021-05-03 00:31:41,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:31:41,551 INFO L225 Difference]: With dead ends: 270 [2021-05-03 00:31:41,551 INFO L226 Difference]: Without dead ends: 199 [2021-05-03 00:31:41,551 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 11 SyntacticMatches, 67 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1032 ImplicationChecksByTransitivity, 7947.2ms TimeCoverageRelationStatistics Valid=792, Invalid=5370, Unknown=0, NotChecked=0, Total=6162 [2021-05-03 00:31:41,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2021-05-03 00:31:41,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 171. [2021-05-03 00:31:41,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 167 states have (on average 1.095808383233533) internal successors, (183), 167 states have internal predecessors, (183), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:31:41,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 186 transitions. [2021-05-03 00:31:41,687 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 186 transitions. Word has length 139 [2021-05-03 00:31:41,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:31:41,687 INFO L480 AbstractCegarLoop]: Abstraction has 171 states and 186 transitions. [2021-05-03 00:31:41,687 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 3.024390243902439) internal successors, (124), 40 states have internal predecessors, (124), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:31:41,687 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 186 transitions. [2021-05-03 00:31:41,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-05-03 00:31:41,688 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:31:41,688 INFO L523 BasicCegarLoop]: trace histogram [38, 37, 37, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:31:41,688 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-05-03 00:31:41,688 INFO L428 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:31:41,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:31:41,688 INFO L82 PathProgramCache]: Analyzing trace with hash -1616780709, now seen corresponding path program 31 times [2021-05-03 00:31:41,688 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:31:41,688 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1159132152] [2021-05-03 00:31:41,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:31:41,709 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:31:41,710 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:31:41,740 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:31:41,758 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:31:41,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:31:41,930 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:31:41,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:31:41,938 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:31:45,485 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:31:45,485 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1159132152] [2021-05-03 00:31:45,485 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1159132152] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:31:45,485 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:31:45,485 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-03 00:31:45,485 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873549232] [2021-05-03 00:31:45,485 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-03 00:31:45,485 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:31:45,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-03 00:31:45,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=1504, Unknown=0, NotChecked=0, Total=1806 [2021-05-03 00:31:45,486 INFO L87 Difference]: Start difference. First operand 171 states and 186 transitions. Second operand has 42 states, 42 states have (on average 3.0238095238095237) internal successors, (127), 41 states have internal predecessors, (127), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:31:50,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:31:50,378 INFO L93 Difference]: Finished difference Result 273 states and 307 transitions. [2021-05-03 00:31:50,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-03 00:31:50,379 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 3.0238095238095237) internal successors, (127), 41 states have internal predecessors, (127), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 142 [2021-05-03 00:31:50,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:31:50,380 INFO L225 Difference]: With dead ends: 273 [2021-05-03 00:31:50,380 INFO L226 Difference]: Without dead ends: 202 [2021-05-03 00:31:50,381 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 11 SyntacticMatches, 69 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1080 ImplicationChecksByTransitivity, 5705.3ms TimeCoverageRelationStatistics Valid=814, Invalid=5666, Unknown=0, NotChecked=0, Total=6480 [2021-05-03 00:31:50,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2021-05-03 00:31:50,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 174. [2021-05-03 00:31:50,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 170 states have (on average 1.0941176470588236) internal successors, (186), 170 states have internal predecessors, (186), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:31:50,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 189 transitions. [2021-05-03 00:31:50,532 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 189 transitions. Word has length 142 [2021-05-03 00:31:50,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:31:50,532 INFO L480 AbstractCegarLoop]: Abstraction has 174 states and 189 transitions. [2021-05-03 00:31:50,532 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 3.0238095238095237) internal successors, (127), 41 states have internal predecessors, (127), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:31:50,533 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 189 transitions. [2021-05-03 00:31:50,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-05-03 00:31:50,533 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:31:50,533 INFO L523 BasicCegarLoop]: trace histogram [39, 38, 38, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:31:50,533 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-05-03 00:31:50,533 INFO L428 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:31:50,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:31:50,534 INFO L82 PathProgramCache]: Analyzing trace with hash 1021678652, now seen corresponding path program 32 times [2021-05-03 00:31:50,534 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:31:50,534 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [353336648] [2021-05-03 00:31:50,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:31:50,559 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:31:50,561 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:31:50,594 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:31:50,613 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:31:50,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:31:50,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:31:50,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:31:50,817 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:31:54,714 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:31:54,714 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [353336648] [2021-05-03 00:31:54,714 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [353336648] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:31:54,714 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:31:54,714 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-03 00:31:54,714 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1141366329] [2021-05-03 00:31:54,715 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-03 00:31:54,716 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:31:54,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-03 00:31:54,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=310, Invalid=1582, Unknown=0, NotChecked=0, Total=1892 [2021-05-03 00:31:54,716 INFO L87 Difference]: Start difference. First operand 174 states and 189 transitions. Second operand has 43 states, 43 states have (on average 3.0232558139534884) internal successors, (130), 42 states have internal predecessors, (130), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:31:59,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:31:59,604 INFO L93 Difference]: Finished difference Result 276 states and 310 transitions. [2021-05-03 00:31:59,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-03 00:31:59,605 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 3.0232558139534884) internal successors, (130), 42 states have internal predecessors, (130), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 145 [2021-05-03 00:31:59,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:31:59,606 INFO L225 Difference]: With dead ends: 276 [2021-05-03 00:31:59,606 INFO L226 Difference]: Without dead ends: 205 [2021-05-03 00:31:59,607 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 11 SyntacticMatches, 71 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1129 ImplicationChecksByTransitivity, 6062.8ms TimeCoverageRelationStatistics Valid=836, Invalid=5970, Unknown=0, NotChecked=0, Total=6806 [2021-05-03 00:31:59,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2021-05-03 00:31:59,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 177. [2021-05-03 00:31:59,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 173 states have (on average 1.092485549132948) internal successors, (189), 173 states have internal predecessors, (189), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:31:59,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 192 transitions. [2021-05-03 00:31:59,759 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 192 transitions. Word has length 145 [2021-05-03 00:31:59,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:31:59,759 INFO L480 AbstractCegarLoop]: Abstraction has 177 states and 192 transitions. [2021-05-03 00:31:59,759 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 3.0232558139534884) internal successors, (130), 42 states have internal predecessors, (130), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:31:59,759 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 192 transitions. [2021-05-03 00:31:59,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-05-03 00:31:59,760 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:31:59,760 INFO L523 BasicCegarLoop]: trace histogram [40, 39, 39, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:31:59,760 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-05-03 00:31:59,760 INFO L428 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:31:59,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:31:59,760 INFO L82 PathProgramCache]: Analyzing trace with hash 1168018107, now seen corresponding path program 33 times [2021-05-03 00:31:59,760 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:31:59,760 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [882697976] [2021-05-03 00:31:59,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:31:59,783 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:31:59,786 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:31:59,814 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:31:59,831 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:31:59,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:32:00,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:32:00,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:32:00,029 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:32:03,990 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:32:03,990 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [882697976] [2021-05-03 00:32:03,990 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [882697976] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:32:03,990 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:32:03,990 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-03 00:32:03,990 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101056072] [2021-05-03 00:32:03,990 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-03 00:32:03,990 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:32:03,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-03 00:32:03,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=318, Invalid=1662, Unknown=0, NotChecked=0, Total=1980 [2021-05-03 00:32:03,991 INFO L87 Difference]: Start difference. First operand 177 states and 192 transitions. Second operand has 44 states, 44 states have (on average 3.022727272727273) internal successors, (133), 43 states have internal predecessors, (133), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:32:09,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:32:09,244 INFO L93 Difference]: Finished difference Result 279 states and 313 transitions. [2021-05-03 00:32:09,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-03 00:32:09,245 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 3.022727272727273) internal successors, (133), 43 states have internal predecessors, (133), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 148 [2021-05-03 00:32:09,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:32:09,245 INFO L225 Difference]: With dead ends: 279 [2021-05-03 00:32:09,245 INFO L226 Difference]: Without dead ends: 208 [2021-05-03 00:32:09,246 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 11 SyntacticMatches, 73 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1179 ImplicationChecksByTransitivity, 6254.8ms TimeCoverageRelationStatistics Valid=858, Invalid=6282, Unknown=0, NotChecked=0, Total=7140 [2021-05-03 00:32:09,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-05-03 00:32:09,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 180. [2021-05-03 00:32:09,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 176 states have (on average 1.0909090909090908) internal successors, (192), 176 states have internal predecessors, (192), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:32:09,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 195 transitions. [2021-05-03 00:32:09,401 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 195 transitions. Word has length 148 [2021-05-03 00:32:09,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:32:09,401 INFO L480 AbstractCegarLoop]: Abstraction has 180 states and 195 transitions. [2021-05-03 00:32:09,401 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 3.022727272727273) internal successors, (133), 43 states have internal predecessors, (133), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:32:09,402 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 195 transitions. [2021-05-03 00:32:09,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-05-03 00:32:09,402 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:32:09,402 INFO L523 BasicCegarLoop]: trace histogram [41, 40, 40, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:32:09,403 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-05-03 00:32:09,403 INFO L428 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:32:09,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:32:09,403 INFO L82 PathProgramCache]: Analyzing trace with hash 1374916572, now seen corresponding path program 34 times [2021-05-03 00:32:09,403 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:32:09,403 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1899597572] [2021-05-03 00:32:09,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:32:09,436 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:32:09,438 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:32:09,471 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:32:09,491 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:32:09,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:32:09,715 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:32:09,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:32:09,718 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:32:14,210 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:32:14,210 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1899597572] [2021-05-03 00:32:14,210 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1899597572] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:32:14,210 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:32:14,210 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2021-05-03 00:32:14,210 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [676596985] [2021-05-03 00:32:14,210 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-03 00:32:14,210 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:32:14,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-03 00:32:14,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=1744, Unknown=0, NotChecked=0, Total=2070 [2021-05-03 00:32:14,211 INFO L87 Difference]: Start difference. First operand 180 states and 195 transitions. Second operand has 45 states, 45 states have (on average 3.022222222222222) internal successors, (136), 44 states have internal predecessors, (136), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:32:20,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:32:20,133 INFO L93 Difference]: Finished difference Result 282 states and 316 transitions. [2021-05-03 00:32:20,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-03 00:32:20,135 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 3.022222222222222) internal successors, (136), 44 states have internal predecessors, (136), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 151 [2021-05-03 00:32:20,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:32:20,136 INFO L225 Difference]: With dead ends: 282 [2021-05-03 00:32:20,136 INFO L226 Difference]: Without dead ends: 211 [2021-05-03 00:32:20,136 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 11 SyntacticMatches, 75 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1230 ImplicationChecksByTransitivity, 7003.4ms TimeCoverageRelationStatistics Valid=880, Invalid=6602, Unknown=0, NotChecked=0, Total=7482 [2021-05-03 00:32:20,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-05-03 00:32:20,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 183. [2021-05-03 00:32:20,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 179 states have (on average 1.089385474860335) internal successors, (195), 179 states have internal predecessors, (195), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:32:20,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 198 transitions. [2021-05-03 00:32:20,313 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 198 transitions. Word has length 151 [2021-05-03 00:32:20,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:32:20,313 INFO L480 AbstractCegarLoop]: Abstraction has 183 states and 198 transitions. [2021-05-03 00:32:20,313 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 3.022222222222222) internal successors, (136), 44 states have internal predecessors, (136), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:32:20,313 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 198 transitions. [2021-05-03 00:32:20,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2021-05-03 00:32:20,314 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:32:20,314 INFO L523 BasicCegarLoop]: trace histogram [42, 41, 41, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:32:20,314 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2021-05-03 00:32:20,314 INFO L428 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:32:20,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:32:20,314 INFO L82 PathProgramCache]: Analyzing trace with hash 1809017627, now seen corresponding path program 35 times [2021-05-03 00:32:20,314 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:32:20,314 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [329846978] [2021-05-03 00:32:20,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:32:20,345 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:32:20,346 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:32:20,386 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:32:20,411 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:32:20,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:32:20,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:32:20,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:32:20,671 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:32:25,272 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:32:25,272 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [329846978] [2021-05-03 00:32:25,272 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [329846978] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:32:25,272 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:32:25,272 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2021-05-03 00:32:25,272 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615171609] [2021-05-03 00:32:25,273 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-03 00:32:25,273 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:32:25,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-03 00:32:25,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=334, Invalid=1828, Unknown=0, NotChecked=0, Total=2162 [2021-05-03 00:32:25,273 INFO L87 Difference]: Start difference. First operand 183 states and 198 transitions. Second operand has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:32:31,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:32:31,430 INFO L93 Difference]: Finished difference Result 285 states and 319 transitions. [2021-05-03 00:32:31,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-03 00:32:31,431 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 154 [2021-05-03 00:32:31,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:32:31,431 INFO L225 Difference]: With dead ends: 285 [2021-05-03 00:32:31,431 INFO L226 Difference]: Without dead ends: 214 [2021-05-03 00:32:31,432 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 11 SyntacticMatches, 77 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1282 ImplicationChecksByTransitivity, 7244.6ms TimeCoverageRelationStatistics Valid=902, Invalid=6930, Unknown=0, NotChecked=0, Total=7832 [2021-05-03 00:32:31,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2021-05-03 00:32:31,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 186. [2021-05-03 00:32:31,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 182 states have (on average 1.0879120879120878) internal successors, (198), 182 states have internal predecessors, (198), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:32:31,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 201 transitions. [2021-05-03 00:32:31,602 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 201 transitions. Word has length 154 [2021-05-03 00:32:31,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:32:31,605 INFO L480 AbstractCegarLoop]: Abstraction has 186 states and 201 transitions. [2021-05-03 00:32:31,605 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:32:31,605 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 201 transitions. [2021-05-03 00:32:31,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-05-03 00:32:31,606 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:32:31,606 INFO L523 BasicCegarLoop]: trace histogram [43, 42, 42, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:32:31,606 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2021-05-03 00:32:31,606 INFO L428 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:32:31,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:32:31,607 INFO L82 PathProgramCache]: Analyzing trace with hash 1967018876, now seen corresponding path program 36 times [2021-05-03 00:32:31,607 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:32:31,607 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [543016609] [2021-05-03 00:32:31,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:32:31,643 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:32:31,644 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:32:31,687 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:32:31,707 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:32:31,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:32:31,919 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:32:31,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:32:31,927 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:32:37,624 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:32:37,624 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [543016609] [2021-05-03 00:32:37,625 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [543016609] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:32:37,625 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:32:37,625 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2021-05-03 00:32:37,625 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2002413333] [2021-05-03 00:32:37,625 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-03 00:32:37,625 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:32:37,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-03 00:32:37,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=342, Invalid=1914, Unknown=0, NotChecked=0, Total=2256 [2021-05-03 00:32:37,626 INFO L87 Difference]: Start difference. First operand 186 states and 201 transitions. Second operand has 47 states, 47 states have (on average 3.021276595744681) internal successors, (142), 46 states have internal predecessors, (142), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:32:46,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:32:46,154 INFO L93 Difference]: Finished difference Result 288 states and 322 transitions. [2021-05-03 00:32:46,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-03 00:32:46,156 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 3.021276595744681) internal successors, (142), 46 states have internal predecessors, (142), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 157 [2021-05-03 00:32:46,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:32:46,157 INFO L225 Difference]: With dead ends: 288 [2021-05-03 00:32:46,158 INFO L226 Difference]: Without dead ends: 217 [2021-05-03 00:32:46,158 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 11 SyntacticMatches, 79 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1335 ImplicationChecksByTransitivity, 9043.9ms TimeCoverageRelationStatistics Valid=924, Invalid=7266, Unknown=0, NotChecked=0, Total=8190 [2021-05-03 00:32:46,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2021-05-03 00:32:46,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 189. [2021-05-03 00:32:46,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 185 states have (on average 1.0864864864864865) internal successors, (201), 185 states have internal predecessors, (201), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:32:46,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 204 transitions. [2021-05-03 00:32:46,354 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 204 transitions. Word has length 157 [2021-05-03 00:32:46,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:32:46,354 INFO L480 AbstractCegarLoop]: Abstraction has 189 states and 204 transitions. [2021-05-03 00:32:46,354 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 3.021276595744681) internal successors, (142), 46 states have internal predecessors, (142), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:32:46,354 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 204 transitions. [2021-05-03 00:32:46,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-05-03 00:32:46,355 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:32:46,355 INFO L523 BasicCegarLoop]: trace histogram [44, 43, 43, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:32:46,355 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-05-03 00:32:46,356 INFO L428 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:32:46,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:32:46,356 INFO L82 PathProgramCache]: Analyzing trace with hash 1698071419, now seen corresponding path program 37 times [2021-05-03 00:32:46,356 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:32:46,356 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [877904010] [2021-05-03 00:32:46,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:32:46,392 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:32:46,393 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:32:46,454 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:32:46,493 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:32:46,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:32:46,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:32:46,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:32:46,837 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:32:53,401 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:32:53,401 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [877904010] [2021-05-03 00:32:53,401 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [877904010] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:32:53,401 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:32:53,401 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2021-05-03 00:32:53,401 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195050908] [2021-05-03 00:32:53,402 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-03 00:32:53,402 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:32:53,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-03 00:32:53,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=350, Invalid=2002, Unknown=0, NotChecked=0, Total=2352 [2021-05-03 00:32:53,402 INFO L87 Difference]: Start difference. First operand 189 states and 204 transitions. Second operand has 48 states, 48 states have (on average 3.0208333333333335) internal successors, (145), 47 states have internal predecessors, (145), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:33:01,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:33:01,272 INFO L93 Difference]: Finished difference Result 291 states and 325 transitions. [2021-05-03 00:33:01,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-03 00:33:01,273 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 3.0208333333333335) internal successors, (145), 47 states have internal predecessors, (145), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 160 [2021-05-03 00:33:01,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:33:01,274 INFO L225 Difference]: With dead ends: 291 [2021-05-03 00:33:01,274 INFO L226 Difference]: Without dead ends: 220 [2021-05-03 00:33:01,275 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 11 SyntacticMatches, 81 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1389 ImplicationChecksByTransitivity, 9803.5ms TimeCoverageRelationStatistics Valid=946, Invalid=7610, Unknown=0, NotChecked=0, Total=8556 [2021-05-03 00:33:01,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2021-05-03 00:33:01,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 192. [2021-05-03 00:33:01,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 188 states have (on average 1.0851063829787233) internal successors, (204), 188 states have internal predecessors, (204), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:33:01,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 207 transitions. [2021-05-03 00:33:01,475 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 207 transitions. Word has length 160 [2021-05-03 00:33:01,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:33:01,475 INFO L480 AbstractCegarLoop]: Abstraction has 192 states and 207 transitions. [2021-05-03 00:33:01,475 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 3.0208333333333335) internal successors, (145), 47 states have internal predecessors, (145), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:33:01,476 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 207 transitions. [2021-05-03 00:33:01,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2021-05-03 00:33:01,476 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:33:01,476 INFO L523 BasicCegarLoop]: trace histogram [45, 44, 44, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:33:01,477 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2021-05-03 00:33:01,477 INFO L428 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:33:01,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:33:01,477 INFO L82 PathProgramCache]: Analyzing trace with hash -401613028, now seen corresponding path program 38 times [2021-05-03 00:33:01,477 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:33:01,477 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [944310302] [2021-05-03 00:33:01,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:33:01,516 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:33:01,518 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:33:01,569 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:33:01,597 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:33:01,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:33:01,850 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:33:01,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:33:01,858 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:33:09,425 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:33:09,425 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [944310302] [2021-05-03 00:33:09,425 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [944310302] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:33:09,425 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:33:09,425 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2021-05-03 00:33:09,425 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078673301] [2021-05-03 00:33:09,426 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-03 00:33:09,426 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:33:09,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-03 00:33:09,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=2092, Unknown=0, NotChecked=0, Total=2450 [2021-05-03 00:33:09,426 INFO L87 Difference]: Start difference. First operand 192 states and 207 transitions. Second operand has 49 states, 49 states have (on average 3.020408163265306) internal successors, (148), 48 states have internal predecessors, (148), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:33:18,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:33:18,425 INFO L93 Difference]: Finished difference Result 294 states and 328 transitions. [2021-05-03 00:33:18,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-03 00:33:18,427 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.020408163265306) internal successors, (148), 48 states have internal predecessors, (148), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 163 [2021-05-03 00:33:18,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:33:18,428 INFO L225 Difference]: With dead ends: 294 [2021-05-03 00:33:18,428 INFO L226 Difference]: Without dead ends: 223 [2021-05-03 00:33:18,429 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 11 SyntacticMatches, 83 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1444 ImplicationChecksByTransitivity, 11026.2ms TimeCoverageRelationStatistics Valid=968, Invalid=7962, Unknown=0, NotChecked=0, Total=8930 [2021-05-03 00:33:18,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2021-05-03 00:33:18,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 195. [2021-05-03 00:33:18,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 191 states have (on average 1.0837696335078535) internal successors, (207), 191 states have internal predecessors, (207), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:33:18,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 210 transitions. [2021-05-03 00:33:18,645 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 210 transitions. Word has length 163 [2021-05-03 00:33:18,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:33:18,646 INFO L480 AbstractCegarLoop]: Abstraction has 195 states and 210 transitions. [2021-05-03 00:33:18,646 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 3.020408163265306) internal successors, (148), 48 states have internal predecessors, (148), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:33:18,646 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 210 transitions. [2021-05-03 00:33:18,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2021-05-03 00:33:18,647 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:33:18,647 INFO L523 BasicCegarLoop]: trace histogram [46, 45, 45, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:33:18,647 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2021-05-03 00:33:18,647 INFO L428 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:33:18,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:33:18,647 INFO L82 PathProgramCache]: Analyzing trace with hash -197274661, now seen corresponding path program 39 times [2021-05-03 00:33:18,648 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:33:18,648 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [401534271] [2021-05-03 00:33:18,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:33:18,682 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:33:18,683 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:33:18,722 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:33:18,750 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:33:18,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:33:19,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:33:19,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:33:19,007 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:33:27,362 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:33:27,362 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [401534271] [2021-05-03 00:33:27,362 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [401534271] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:33:27,362 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:33:27,362 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2021-05-03 00:33:27,363 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [339085829] [2021-05-03 00:33:27,363 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-03 00:33:27,363 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:33:27,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-03 00:33:27,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=2184, Unknown=0, NotChecked=0, Total=2550 [2021-05-03 00:33:27,363 INFO L87 Difference]: Start difference. First operand 195 states and 210 transitions. Second operand has 50 states, 50 states have (on average 3.02) internal successors, (151), 49 states have internal predecessors, (151), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:33:42,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:33:42,548 INFO L93 Difference]: Finished difference Result 297 states and 331 transitions. [2021-05-03 00:33:42,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-03 00:33:42,551 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 3.02) internal successors, (151), 49 states have internal predecessors, (151), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 166 [2021-05-03 00:33:42,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:33:42,552 INFO L225 Difference]: With dead ends: 297 [2021-05-03 00:33:42,552 INFO L226 Difference]: Without dead ends: 226 [2021-05-03 00:33:42,553 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 11 SyntacticMatches, 85 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1500 ImplicationChecksByTransitivity, 13603.3ms TimeCoverageRelationStatistics Valid=990, Invalid=8322, Unknown=0, NotChecked=0, Total=9312 [2021-05-03 00:33:42,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2021-05-03 00:33:42,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 198. [2021-05-03 00:33:42,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 194 states have (on average 1.0824742268041236) internal successors, (210), 194 states have internal predecessors, (210), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:33:42,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 213 transitions. [2021-05-03 00:33:42,790 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 213 transitions. Word has length 166 [2021-05-03 00:33:42,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:33:42,790 INFO L480 AbstractCegarLoop]: Abstraction has 198 states and 213 transitions. [2021-05-03 00:33:42,790 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 3.02) internal successors, (151), 49 states have internal predecessors, (151), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:33:42,790 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 213 transitions. [2021-05-03 00:33:42,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2021-05-03 00:33:42,791 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:33:42,791 INFO L523 BasicCegarLoop]: trace histogram [47, 46, 46, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:33:42,791 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2021-05-03 00:33:42,791 INFO L428 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:33:42,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:33:42,792 INFO L82 PathProgramCache]: Analyzing trace with hash 1278358204, now seen corresponding path program 40 times [2021-05-03 00:33:42,792 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:33:42,792 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1325246209] [2021-05-03 00:33:42,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:33:42,818 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:33:42,820 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:33:42,866 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:33:42,902 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:33:42,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:33:43,239 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 18 [2021-05-03 00:33:43,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:33:43,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:33:43,311 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:33:53,373 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:33:53,373 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1325246209] [2021-05-03 00:33:53,374 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1325246209] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:33:53,374 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:33:53,374 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2021-05-03 00:33:53,374 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30085754] [2021-05-03 00:33:53,374 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-03 00:33:53,374 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:33:53,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-03 00:33:53,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=374, Invalid=2278, Unknown=0, NotChecked=0, Total=2652 [2021-05-03 00:33:53,375 INFO L87 Difference]: Start difference. First operand 198 states and 213 transitions. Second operand has 51 states, 51 states have (on average 3.019607843137255) internal successors, (154), 50 states have internal predecessors, (154), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:34:07,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:34:07,147 INFO L93 Difference]: Finished difference Result 300 states and 334 transitions. [2021-05-03 00:34:07,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-03 00:34:07,149 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 3.019607843137255) internal successors, (154), 50 states have internal predecessors, (154), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 169 [2021-05-03 00:34:07,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:34:07,150 INFO L225 Difference]: With dead ends: 300 [2021-05-03 00:34:07,150 INFO L226 Difference]: Without dead ends: 229 [2021-05-03 00:34:07,151 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 11 SyntacticMatches, 87 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1557 ImplicationChecksByTransitivity, 15154.9ms TimeCoverageRelationStatistics Valid=1012, Invalid=8690, Unknown=0, NotChecked=0, Total=9702 [2021-05-03 00:34:07,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2021-05-03 00:34:07,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 201. [2021-05-03 00:34:07,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 197 states have (on average 1.0812182741116751) internal successors, (213), 197 states have internal predecessors, (213), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:34:07,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 216 transitions. [2021-05-03 00:34:07,382 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 216 transitions. Word has length 169 [2021-05-03 00:34:07,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:34:07,382 INFO L480 AbstractCegarLoop]: Abstraction has 201 states and 216 transitions. [2021-05-03 00:34:07,382 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 3.019607843137255) internal successors, (154), 50 states have internal predecessors, (154), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:34:07,382 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 216 transitions. [2021-05-03 00:34:07,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2021-05-03 00:34:07,383 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:34:07,383 INFO L523 BasicCegarLoop]: trace histogram [48, 47, 47, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:34:07,383 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2021-05-03 00:34:07,383 INFO L428 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:34:07,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:34:07,383 INFO L82 PathProgramCache]: Analyzing trace with hash -1428202437, now seen corresponding path program 41 times [2021-05-03 00:34:07,383 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:34:07,383 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1407238624] [2021-05-03 00:34:07,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:34:07,416 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:34:07,417 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:34:07,466 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:34:07,500 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:34:07,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:34:07,821 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:34:07,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:34:07,825 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:34:19,333 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:34:19,334 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1407238624] [2021-05-03 00:34:19,334 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1407238624] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:34:19,334 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:34:19,334 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2021-05-03 00:34:19,334 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888571165] [2021-05-03 00:34:19,334 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-03 00:34:19,334 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:34:19,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-03 00:34:19,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=2374, Unknown=0, NotChecked=0, Total=2756 [2021-05-03 00:34:19,335 INFO L87 Difference]: Start difference. First operand 201 states and 216 transitions. Second operand has 52 states, 52 states have (on average 3.019230769230769) internal successors, (157), 51 states have internal predecessors, (157), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:34:34,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:34:34,592 INFO L93 Difference]: Finished difference Result 303 states and 337 transitions. [2021-05-03 00:34:34,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-03 00:34:34,594 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 3.019230769230769) internal successors, (157), 51 states have internal predecessors, (157), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 172 [2021-05-03 00:34:34,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:34:34,595 INFO L225 Difference]: With dead ends: 303 [2021-05-03 00:34:34,595 INFO L226 Difference]: Without dead ends: 232 [2021-05-03 00:34:34,596 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 11 SyntacticMatches, 89 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1615 ImplicationChecksByTransitivity, 16911.1ms TimeCoverageRelationStatistics Valid=1034, Invalid=9066, Unknown=0, NotChecked=0, Total=10100 [2021-05-03 00:34:34,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2021-05-03 00:34:34,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 204. [2021-05-03 00:34:34,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 200 states have (on average 1.08) internal successors, (216), 200 states have internal predecessors, (216), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:34:34,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 219 transitions. [2021-05-03 00:34:34,936 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 219 transitions. Word has length 172 [2021-05-03 00:34:34,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:34:34,936 INFO L480 AbstractCegarLoop]: Abstraction has 204 states and 219 transitions. [2021-05-03 00:34:34,937 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 3.019230769230769) internal successors, (157), 51 states have internal predecessors, (157), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:34:34,937 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 219 transitions. [2021-05-03 00:34:34,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2021-05-03 00:34:34,937 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:34:34,938 INFO L523 BasicCegarLoop]: trace histogram [49, 48, 48, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:34:34,938 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2021-05-03 00:34:34,938 INFO L428 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:34:34,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:34:34,938 INFO L82 PathProgramCache]: Analyzing trace with hash 1139756636, now seen corresponding path program 42 times [2021-05-03 00:34:34,938 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:34:34,938 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1084988267] [2021-05-03 00:34:34,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:34:34,973 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:34:34,975 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:34:35,030 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:34:35,066 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:34:35,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:34:35,417 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 18 [2021-05-03 00:34:35,489 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:34:35,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:34:35,495 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:34:46,663 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:34:46,663 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1084988267] [2021-05-03 00:34:46,663 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1084988267] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:34:46,663 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:34:46,663 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2021-05-03 00:34:46,663 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442667251] [2021-05-03 00:34:46,663 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-03 00:34:46,663 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:34:46,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-03 00:34:46,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=390, Invalid=2472, Unknown=0, NotChecked=0, Total=2862 [2021-05-03 00:34:46,664 INFO L87 Difference]: Start difference. First operand 204 states and 219 transitions. Second operand has 53 states, 53 states have (on average 3.018867924528302) internal successors, (160), 52 states have internal predecessors, (160), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:35:04,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:35:04,950 INFO L93 Difference]: Finished difference Result 306 states and 340 transitions. [2021-05-03 00:35:04,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-03 00:35:04,953 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 3.018867924528302) internal successors, (160), 52 states have internal predecessors, (160), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 175 [2021-05-03 00:35:04,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:35:04,953 INFO L225 Difference]: With dead ends: 306 [2021-05-03 00:35:04,953 INFO L226 Difference]: Without dead ends: 235 [2021-05-03 00:35:04,954 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 11 SyntacticMatches, 91 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1674 ImplicationChecksByTransitivity, 17611.4ms TimeCoverageRelationStatistics Valid=1056, Invalid=9450, Unknown=0, NotChecked=0, Total=10506 [2021-05-03 00:35:04,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2021-05-03 00:35:05,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 207. [2021-05-03 00:35:05,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 203 states have (on average 1.0788177339901477) internal successors, (219), 203 states have internal predecessors, (219), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:35:05,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 222 transitions. [2021-05-03 00:35:05,196 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 222 transitions. Word has length 175 [2021-05-03 00:35:05,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:35:05,196 INFO L480 AbstractCegarLoop]: Abstraction has 207 states and 222 transitions. [2021-05-03 00:35:05,196 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 3.018867924528302) internal successors, (160), 52 states have internal predecessors, (160), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:35:05,196 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 222 transitions. [2021-05-03 00:35:05,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2021-05-03 00:35:05,196 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:35:05,197 INFO L523 BasicCegarLoop]: trace histogram [50, 49, 49, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:35:05,197 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2021-05-03 00:35:05,197 INFO L428 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:35:05,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:35:05,197 INFO L82 PathProgramCache]: Analyzing trace with hash 1251024027, now seen corresponding path program 43 times [2021-05-03 00:35:05,197 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:35:05,197 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [78912362] [2021-05-03 00:35:05,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:35:05,222 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:35:05,224 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:35:05,276 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:35:05,320 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:35:05,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:35:05,693 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 18 [2021-05-03 00:35:05,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:35:05,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:35:05,797 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:35:20,467 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:35:20,467 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [78912362] [2021-05-03 00:35:20,467 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [78912362] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:35:20,467 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:35:20,467 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2021-05-03 00:35:20,467 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969150921] [2021-05-03 00:35:20,468 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-03 00:35:20,468 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:35:20,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-03 00:35:20,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=398, Invalid=2572, Unknown=0, NotChecked=0, Total=2970 [2021-05-03 00:35:20,468 INFO L87 Difference]: Start difference. First operand 207 states and 222 transitions. Second operand has 54 states, 54 states have (on average 3.0185185185185186) internal successors, (163), 53 states have internal predecessors, (163), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:35:42,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:35:42,880 INFO L93 Difference]: Finished difference Result 309 states and 343 transitions. [2021-05-03 00:35:42,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-03 00:35:42,883 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 3.0185185185185186) internal successors, (163), 53 states have internal predecessors, (163), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 178 [2021-05-03 00:35:42,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:35:42,884 INFO L225 Difference]: With dead ends: 309 [2021-05-03 00:35:42,884 INFO L226 Difference]: Without dead ends: 238 [2021-05-03 00:35:42,885 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 11 SyntacticMatches, 93 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1734 ImplicationChecksByTransitivity, 22302.3ms TimeCoverageRelationStatistics Valid=1078, Invalid=9842, Unknown=0, NotChecked=0, Total=10920 [2021-05-03 00:35:42,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2021-05-03 00:35:43,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 210. [2021-05-03 00:35:43,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 206 states have (on average 1.0776699029126213) internal successors, (222), 206 states have internal predecessors, (222), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:35:43,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 225 transitions. [2021-05-03 00:35:43,140 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 225 transitions. Word has length 178 [2021-05-03 00:35:43,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:35:43,140 INFO L480 AbstractCegarLoop]: Abstraction has 210 states and 225 transitions. [2021-05-03 00:35:43,140 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 3.0185185185185186) internal successors, (163), 53 states have internal predecessors, (163), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:35:43,140 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 225 transitions. [2021-05-03 00:35:43,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2021-05-03 00:35:43,141 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:35:43,141 INFO L523 BasicCegarLoop]: trace histogram [51, 50, 50, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:35:43,141 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2021-05-03 00:35:43,141 INFO L428 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:35:43,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:35:43,142 INFO L82 PathProgramCache]: Analyzing trace with hash 303116796, now seen corresponding path program 44 times [2021-05-03 00:35:43,142 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:35:43,142 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1565503863] [2021-05-03 00:35:43,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:35:43,175 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:35:43,178 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:35:43,253 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:35:43,297 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:35:43,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:35:43,433 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 9 [2021-05-03 00:35:43,681 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 18 [2021-05-03 00:35:43,750 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:35:43,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:35:43,754 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:36:03,336 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:36:03,337 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1565503863] [2021-05-03 00:36:03,337 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1565503863] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:36:03,337 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:36:03,337 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [55] imperfect sequences [] total 55 [2021-05-03 00:36:03,337 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666144063] [2021-05-03 00:36:03,337 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-03 00:36:03,338 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:36:03,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-03 00:36:03,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=2674, Unknown=0, NotChecked=0, Total=3080 [2021-05-03 00:36:03,338 INFO L87 Difference]: Start difference. First operand 210 states and 225 transitions. Second operand has 55 states, 55 states have (on average 3.018181818181818) internal successors, (166), 54 states have internal predecessors, (166), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:36:08,198 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:36:12,370 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:36:14,753 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:36:19,236 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:36:22,237 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:36:22,912 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:36:23,662 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:36:24,952 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:36:32,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:36:32,815 INFO L93 Difference]: Finished difference Result 312 states and 346 transitions. [2021-05-03 00:36:32,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-03 00:36:32,819 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.018181818181818) internal successors, (166), 54 states have internal predecessors, (166), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 181 [2021-05-03 00:36:32,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:36:32,820 INFO L225 Difference]: With dead ends: 312 [2021-05-03 00:36:32,820 INFO L226 Difference]: Without dead ends: 241 [2021-05-03 00:36:32,821 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 11 SyntacticMatches, 95 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1795 ImplicationChecksByTransitivity, 29297.0ms TimeCoverageRelationStatistics Valid=1100, Invalid=10242, Unknown=0, NotChecked=0, Total=11342 [2021-05-03 00:36:32,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2021-05-03 00:36:33,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 213. [2021-05-03 00:36:33,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 209 states have (on average 1.076555023923445) internal successors, (225), 209 states have internal predecessors, (225), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:36:33,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 228 transitions. [2021-05-03 00:36:33,102 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 228 transitions. Word has length 181 [2021-05-03 00:36:33,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:36:33,102 INFO L480 AbstractCegarLoop]: Abstraction has 213 states and 228 transitions. [2021-05-03 00:36:33,102 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 3.018181818181818) internal successors, (166), 54 states have internal predecessors, (166), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:36:33,102 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 228 transitions. [2021-05-03 00:36:33,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2021-05-03 00:36:33,103 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:36:33,103 INFO L523 BasicCegarLoop]: trace histogram [52, 51, 51, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:36:33,103 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2021-05-03 00:36:33,103 INFO L428 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:36:33,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:36:33,103 INFO L82 PathProgramCache]: Analyzing trace with hash 608769275, now seen corresponding path program 45 times [2021-05-03 00:36:33,103 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:36:33,103 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1486992458] [2021-05-03 00:36:33,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:36:33,131 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:36:33,135 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:36:33,207 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:36:33,265 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:36:33,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:36:33,405 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 9 [2021-05-03 00:36:33,684 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 18 [2021-05-03 00:36:33,771 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:36:33,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:36:33,788 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:36:57,351 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:36:57,351 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1486992458] [2021-05-03 00:36:57,351 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1486992458] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:36:57,351 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:36:57,352 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [56] imperfect sequences [] total 56 [2021-05-03 00:36:57,352 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058869161] [2021-05-03 00:36:57,352 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-03 00:36:57,352 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:36:57,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-03 00:36:57,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=414, Invalid=2778, Unknown=0, NotChecked=0, Total=3192 [2021-05-03 00:36:57,353 INFO L87 Difference]: Start difference. First operand 213 states and 228 transitions. Second operand has 56 states, 56 states have (on average 3.017857142857143) internal successors, (169), 55 states have internal predecessors, (169), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:36:57,732 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2021-05-03 00:36:58,358 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-03 00:36:59,064 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:36:59,793 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:00,469 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:01,184 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:02,465 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:03,413 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:04,158 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:04,873 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:05,693 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:06,557 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:07,459 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:08,288 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:09,031 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:09,992 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:10,865 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:11,654 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:12,412 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:13,154 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:13,873 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:14,587 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:15,345 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:16,078 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:16,834 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:17,683 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:18,586 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:19,528 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:20,383 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:21,238 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:22,086 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:22,992 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:23,907 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:24,699 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:25,518 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:26,438 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:27,287 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:28,355 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:29,327 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:30,249 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:31,161 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:32,040 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:32,911 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:33,880 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:34,845 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:35,824 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:36,975 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:37,892 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:37:39,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:37:39,313 INFO L93 Difference]: Finished difference Result 315 states and 349 transitions. [2021-05-03 00:37:39,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-03 00:37:39,320 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 3.017857142857143) internal successors, (169), 55 states have internal predecessors, (169), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 184 [2021-05-03 00:37:39,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:37:39,321 INFO L225 Difference]: With dead ends: 315 [2021-05-03 00:37:39,321 INFO L226 Difference]: Without dead ends: 244 [2021-05-03 00:37:39,322 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 11 SyntacticMatches, 97 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1857 ImplicationChecksByTransitivity, 37055.5ms TimeCoverageRelationStatistics Valid=1122, Invalid=10650, Unknown=0, NotChecked=0, Total=11772 [2021-05-03 00:37:39,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-05-03 00:37:39,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 216. [2021-05-03 00:37:39,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 212 states have (on average 1.0754716981132075) internal successors, (228), 212 states have internal predecessors, (228), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:37:39,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 231 transitions. [2021-05-03 00:37:39,634 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 231 transitions. Word has length 184 [2021-05-03 00:37:39,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:37:39,635 INFO L480 AbstractCegarLoop]: Abstraction has 216 states and 231 transitions. [2021-05-03 00:37:39,635 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 56 states have (on average 3.017857142857143) internal successors, (169), 55 states have internal predecessors, (169), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:37:39,635 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 231 transitions. [2021-05-03 00:37:39,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2021-05-03 00:37:39,636 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:37:39,636 INFO L523 BasicCegarLoop]: trace histogram [53, 52, 52, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:37:39,636 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2021-05-03 00:37:39,636 INFO L428 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:37:39,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:37:39,637 INFO L82 PathProgramCache]: Analyzing trace with hash 971103644, now seen corresponding path program 46 times [2021-05-03 00:37:39,637 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:37:39,637 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [850051374] [2021-05-03 00:37:39,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:37:39,675 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:37:39,678 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:37:39,791 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:37:39,882 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:37:39,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:40,116 WARN L205 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 9 [2021-05-03 00:37:40,305 WARN L205 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 15 [2021-05-03 00:37:40,555 WARN L205 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 18 [2021-05-03 00:37:40,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:37:40,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:40,722 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:37:41,152 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 14 [2021-05-03 00:37:41,307 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2021-05-03 00:38:11,611 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:38:11,611 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [850051374] [2021-05-03 00:38:11,611 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [850051374] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:38:11,612 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:38:11,612 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2021-05-03 00:38:11,612 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223033729] [2021-05-03 00:38:11,612 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-03 00:38:11,612 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:38:11,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-03 00:38:11,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=422, Invalid=2884, Unknown=0, NotChecked=0, Total=3306 [2021-05-03 00:38:11,613 INFO L87 Difference]: Start difference. First operand 216 states and 231 transitions. Second operand has 57 states, 57 states have (on average 3.017543859649123) internal successors, (172), 56 states have internal predecessors, (172), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:38:11,871 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-03 00:38:11,999 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2021-05-03 00:38:12,353 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-03 00:38:13,332 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:14,901 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:15,602 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:16,294 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:16,953 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:17,633 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:18,386 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:19,193 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:19,929 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:20,696 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:21,461 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:22,221 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:23,039 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:23,796 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:24,658 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:25,639 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:26,516 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:27,486 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:28,348 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:29,228 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:30,180 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:30,986 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:31,933 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:32,822 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:33,674 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:34,490 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:35,354 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:36,273 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:37,153 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:38,005 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:38,881 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:39,834 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:40,728 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:41,524 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:42,548 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:43,443 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:44,273 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:45,146 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:45,982 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:46,880 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:47,927 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:49,004 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:50,178 WARN L205 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:51,469 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:52,495 WARN L205 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:53,543 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:54,593 WARN L205 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:38:56,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:38:56,273 INFO L93 Difference]: Finished difference Result 318 states and 352 transitions. [2021-05-03 00:38:56,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-03 00:38:56,282 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 3.017543859649123) internal successors, (172), 56 states have internal predecessors, (172), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 187 [2021-05-03 00:38:56,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:38:56,284 INFO L225 Difference]: With dead ends: 318 [2021-05-03 00:38:56,284 INFO L226 Difference]: Without dead ends: 247 [2021-05-03 00:38:56,286 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 11 SyntacticMatches, 99 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1920 ImplicationChecksByTransitivity, 45231.7ms TimeCoverageRelationStatistics Valid=1144, Invalid=11066, Unknown=0, NotChecked=0, Total=12210 [2021-05-03 00:38:56,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2021-05-03 00:38:56,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 219. [2021-05-03 00:38:56,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 215 states have (on average 1.0744186046511628) internal successors, (231), 215 states have internal predecessors, (231), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:38:56,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 234 transitions. [2021-05-03 00:38:56,715 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 234 transitions. Word has length 187 [2021-05-03 00:38:56,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:38:56,715 INFO L480 AbstractCegarLoop]: Abstraction has 219 states and 234 transitions. [2021-05-03 00:38:56,715 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 3.017543859649123) internal successors, (172), 56 states have internal predecessors, (172), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:38:56,715 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 234 transitions. [2021-05-03 00:38:56,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2021-05-03 00:38:56,717 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:38:56,717 INFO L523 BasicCegarLoop]: trace histogram [54, 53, 53, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:38:56,717 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2021-05-03 00:38:56,717 INFO L428 AbstractCegarLoop]: === Iteration 52 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:38:56,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:38:56,718 INFO L82 PathProgramCache]: Analyzing trace with hash 2021475675, now seen corresponding path program 47 times [2021-05-03 00:38:56,718 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:38:56,718 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [545121981] [2021-05-03 00:38:56,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:38:56,765 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:38:56,770 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:38:56,899 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:38:57,001 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:38:57,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:38:57,285 WARN L205 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 9 [2021-05-03 00:38:57,526 WARN L205 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 15 [2021-05-03 00:38:57,863 WARN L205 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 18 [2021-05-03 00:38:58,056 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:38:58,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:38:58,066 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:38:58,268 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 10 [2021-05-03 00:38:58,465 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 12 [2021-05-03 00:38:58,697 WARN L205 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 14 [2021-05-03 00:38:58,926 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2021-05-03 00:39:31,179 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:39:31,180 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [545121981] [2021-05-03 00:39:31,180 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [545121981] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:39:31,180 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:39:31,180 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [58] imperfect sequences [] total 58 [2021-05-03 00:39:31,180 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466650399] [2021-05-03 00:39:31,181 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-03 00:39:31,181 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:39:31,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-03 00:39:31,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=430, Invalid=2992, Unknown=0, NotChecked=0, Total=3422 [2021-05-03 00:39:31,182 INFO L87 Difference]: Start difference. First operand 219 states and 234 transitions. Second operand has 58 states, 58 states have (on average 3.0172413793103448) internal successors, (175), 57 states have internal predecessors, (175), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:39:31,592 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-03 00:39:31,826 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-03 00:39:32,101 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2021-05-03 00:39:32,576 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-03 00:39:33,059 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-03 00:39:34,139 WARN L205 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:35,176 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:36,188 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:37,254 WARN L205 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:38,366 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:39,377 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:40,432 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:41,396 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:42,306 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:43,089 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:43,896 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:44,725 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:45,511 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:46,272 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:46,986 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:47,866 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:48,605 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:49,353 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:50,360 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:51,343 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:52,177 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:53,288 WARN L205 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:54,305 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:55,338 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:56,156 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:56,980 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:57,787 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:58,543 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:39:59,296 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:40:00,203 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:40:01,541 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:40:02,263 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:40:03,090 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:40:04,070 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:40:04,857 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:40:05,656 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:40:06,452 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:40:07,224 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:40:08,184 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:40:09,121 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:40:10,152 WARN L205 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:40:11,236 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:40:12,441 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:40:13,580 WARN L205 SmtUtils]: Spent 179.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:40:14,637 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:40:15,685 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:40:16,486 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:40:17,321 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:40:19,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:40:19,352 INFO L93 Difference]: Finished difference Result 321 states and 355 transitions. [2021-05-03 00:40:19,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-03 00:40:19,358 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 3.0172413793103448) internal successors, (175), 57 states have internal predecessors, (175), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 190 [2021-05-03 00:40:19,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:40:19,359 INFO L225 Difference]: With dead ends: 321 [2021-05-03 00:40:19,359 INFO L226 Difference]: Without dead ends: 250 [2021-05-03 00:40:19,360 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 11 SyntacticMatches, 101 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1984 ImplicationChecksByTransitivity, 48493.3ms TimeCoverageRelationStatistics Valid=1166, Invalid=11490, Unknown=0, NotChecked=0, Total=12656 [2021-05-03 00:40:19,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2021-05-03 00:40:19,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 222. [2021-05-03 00:40:19,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 218 states have (on average 1.073394495412844) internal successors, (234), 218 states have internal predecessors, (234), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:40:19,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 237 transitions. [2021-05-03 00:40:19,691 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 237 transitions. Word has length 190 [2021-05-03 00:40:19,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:40:19,691 INFO L480 AbstractCegarLoop]: Abstraction has 222 states and 237 transitions. [2021-05-03 00:40:19,692 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 3.0172413793103448) internal successors, (175), 57 states have internal predecessors, (175), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:40:19,692 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 237 transitions. [2021-05-03 00:40:19,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2021-05-03 00:40:19,693 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:40:19,693 INFO L523 BasicCegarLoop]: trace histogram [55, 54, 54, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:40:19,693 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2021-05-03 00:40:19,693 INFO L428 AbstractCegarLoop]: === Iteration 53 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:40:19,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:40:19,694 INFO L82 PathProgramCache]: Analyzing trace with hash 522932540, now seen corresponding path program 48 times [2021-05-03 00:40:19,694 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:40:19,694 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [920523965] [2021-05-03 00:40:19,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:40:19,740 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:40:19,742 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:40:19,829 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:40:19,901 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:40:19,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:20,100 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 9 [2021-05-03 00:40:20,267 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 15 [2021-05-03 00:40:20,527 WARN L205 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 18 [2021-05-03 00:40:20,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:40:20,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:20,659 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:40:53,633 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:40:53,633 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [920523965] [2021-05-03 00:40:53,633 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [920523965] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:40:53,633 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:40:53,633 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [59] imperfect sequences [] total 59 [2021-05-03 00:40:53,633 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1545123844] [2021-05-03 00:40:53,634 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-03 00:40:53,634 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:40:53,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-03 00:40:53,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=438, Invalid=3102, Unknown=0, NotChecked=0, Total=3540 [2021-05-03 00:40:53,634 INFO L87 Difference]: Start difference. First operand 222 states and 237 transitions. Second operand has 59 states, 59 states have (on average 3.016949152542373) internal successors, (178), 58 states have internal predecessors, (178), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:40:54,298 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-03 00:40:54,635 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-03 00:40:55,335 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:40:56,045 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:40:56,794 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:40:57,674 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:40:58,425 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:40:59,277 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:00,198 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:01,196 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:02,205 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:03,130 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:04,147 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:05,167 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:06,329 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:07,436 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:08,336 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:09,504 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:10,352 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:11,210 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:12,086 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:12,919 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:13,738 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:14,596 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:15,412 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:16,305 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:17,140 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:17,946 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:18,766 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:19,634 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:20,523 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:21,539 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:22,289 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:23,044 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:23,803 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:24,572 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:25,389 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:26,257 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:27,245 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:28,109 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:28,995 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:30,069 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:30,922 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:31,827 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:32,690 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:33,551 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:34,433 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:35,425 WARN L205 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:36,479 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:37,582 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:38,518 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:39,591 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:41:41,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:41:41,202 INFO L93 Difference]: Finished difference Result 324 states and 358 transitions. [2021-05-03 00:41:41,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-03 00:41:41,210 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 3.016949152542373) internal successors, (178), 58 states have internal predecessors, (178), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 193 [2021-05-03 00:41:41,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:41:41,211 INFO L225 Difference]: With dead ends: 324 [2021-05-03 00:41:41,211 INFO L226 Difference]: Without dead ends: 253 [2021-05-03 00:41:41,212 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 11 SyntacticMatches, 103 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2049 ImplicationChecksByTransitivity, 47971.1ms TimeCoverageRelationStatistics Valid=1188, Invalid=11922, Unknown=0, NotChecked=0, Total=13110 [2021-05-03 00:41:41,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2021-05-03 00:41:41,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 225. [2021-05-03 00:41:41,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 221 states have (on average 1.0723981900452488) internal successors, (237), 221 states have internal predecessors, (237), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:41:41,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 240 transitions. [2021-05-03 00:41:41,608 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 240 transitions. Word has length 193 [2021-05-03 00:41:41,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:41:41,608 INFO L480 AbstractCegarLoop]: Abstraction has 225 states and 240 transitions. [2021-05-03 00:41:41,608 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 3.016949152542373) internal successors, (178), 58 states have internal predecessors, (178), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:41:41,608 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 240 transitions. [2021-05-03 00:41:41,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2021-05-03 00:41:41,609 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:41:41,609 INFO L523 BasicCegarLoop]: trace histogram [56, 55, 55, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:41:41,609 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2021-05-03 00:41:41,609 INFO L428 AbstractCegarLoop]: === Iteration 54 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:41:41,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:41:41,609 INFO L82 PathProgramCache]: Analyzing trace with hash -685527621, now seen corresponding path program 49 times [2021-05-03 00:41:41,610 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:41:41,610 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1194806247] [2021-05-03 00:41:41,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:41:41,649 INFO L181 rdanLoopAcceleration]: Guard: Formula: false InVars {} OutVars{} AuxVars[] AssignedVars[] [2021-05-03 00:41:41,652 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-03 00:41:41,759 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-03 00:41:41,839 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-03 00:41:41,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:41:42,083 WARN L205 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 9 [2021-05-03 00:41:42,276 WARN L205 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 15 [2021-05-03 00:41:42,561 WARN L205 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 18 [2021-05-03 00:41:42,709 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:41:42,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:41:42,716 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-03 00:41:43,146 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 14 [2021-05-03 00:41:43,308 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2021-05-03 00:42:17,320 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:42:17,320 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1194806247] [2021-05-03 00:42:17,320 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1194806247] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:42:17,320 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:42:17,320 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [60] imperfect sequences [] total 60 [2021-05-03 00:42:17,320 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2079302958] [2021-05-03 00:42:17,321 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-03 00:42:17,321 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:42:17,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-03 00:42:17,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=446, Invalid=3214, Unknown=0, NotChecked=0, Total=3660 [2021-05-03 00:42:17,322 INFO L87 Difference]: Start difference. First operand 225 states and 240 transitions. Second operand has 60 states, 60 states have (on average 3.0166666666666666) internal successors, (181), 59 states have internal predecessors, (181), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-03 00:42:17,497 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2021-05-03 00:42:17,641 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-03 00:42:17,805 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2021-05-03 00:42:18,237 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-03 00:42:18,691 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-03 00:42:19,907 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:42:20,966 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:42:21,966 WARN L205 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:42:23,060 WARN L205 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:42:24,188 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:42:25,342 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:42:26,432 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:42:27,500 WARN L205 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:42:28,554 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:42:29,664 WARN L205 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:42:30,752 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:42:31,871 WARN L205 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2021-05-03 00:42:33,023 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 47