/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/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-simple/nested_6.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 13:34:29,064 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 13:34:29,065 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 13:34:29,085 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 13:34:29,091 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 13:34:29,092 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 13:34:29,092 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 13:34:29,093 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 13:34:29,093 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 13:34:29,094 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 13:34:29,095 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 13:34:29,096 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 13:34:29,096 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 13:34:29,097 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 13:34:29,098 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 13:34:29,098 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 13:34:29,099 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 13:34:29,104 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 13:34:29,104 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 13:34:29,105 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 13:34:29,106 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 13:34:29,119 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 13:34:29,119 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 13:34:29,120 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 13:34:29,121 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 13:34:29,121 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 13:34:29,121 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 13:34:29,121 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 13:34:29,121 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 13:34:29,121 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 13:34:29,121 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 13:34:29,121 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 13:34:29,122 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 13:34:29,122 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 13:34:29,122 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 13:34:29,122 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 13:34:29,122 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 13:34:29,122 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 13:34:29,122 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 13:34:29,123 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 13:34:29,123 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 13:34:29,123 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:34:29,123 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 13:34:29,123 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 13:34:29,123 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 13:34:29,123 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 13:34:29,124 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 13:34:29,124 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 13:34:29,124 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 13:34:29,124 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 13:34:29,351 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 13:34:29,364 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 13:34:29,365 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 13:34:29,366 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 13:34:29,366 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 13:34:29,367 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-simple/nested_6.c [2021-05-02 13:34:29,413 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ae4f64b39/a7e539221ea84b6b85e779d0dfc4f0c4/FLAGc8b2adb43 [2021-05-02 13:34:29,773 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 13:34:29,773 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_6.c [2021-05-02 13:34:29,777 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ae4f64b39/a7e539221ea84b6b85e779d0dfc4f0c4/FLAGc8b2adb43 [2021-05-02 13:34:30,205 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ae4f64b39/a7e539221ea84b6b85e779d0dfc4f0c4 [2021-05-02 13:34:30,207 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 13:34:30,208 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 13:34:30,209 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 13:34:30,209 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 13:34:30,212 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 13:34:30,213 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:34:30" (1/1) ... [2021-05-02 13:34:30,214 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f5c43a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:34:30, skipping insertion in model container [2021-05-02 13:34:30,214 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:34:30" (1/1) ... [2021-05-02 13:34:30,218 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 13:34:30,227 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 13:34:30,315 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/nested_6.c[959,972] [2021-05-02 13:34:30,322 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:34:30,327 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 13:34:30,355 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/nested_6.c[959,972] [2021-05-02 13:34:30,359 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:34:30,369 INFO L208 MainTranslator]: Completed translation [2021-05-02 13:34:30,369 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:34:30 WrapperNode [2021-05-02 13:34:30,370 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 13:34:30,371 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 13:34:30,372 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 13:34:30,373 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 13:34:30,379 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:34:30" (1/1) ... [2021-05-02 13:34:30,380 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:34:30" (1/1) ... [2021-05-02 13:34:30,384 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:34:30" (1/1) ... [2021-05-02 13:34:30,385 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:34:30" (1/1) ... [2021-05-02 13:34:30,393 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:34:30" (1/1) ... [2021-05-02 13:34:30,397 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:34:30" (1/1) ... [2021-05-02 13:34:30,400 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:34:30" (1/1) ... [2021-05-02 13:34:30,403 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 13:34:30,404 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 13:34:30,404 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 13:34:30,404 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 13:34:30,405 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:34:30" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:34:30,481 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 13:34:30,481 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 13:34:30,481 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 13:34:30,481 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 13:34:30,481 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 13:34:30,481 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 13:34:30,482 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 13:34:30,482 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 13:34:30,482 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 13:34:30,482 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 13:34:30,482 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 13:34:30,482 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 13:34:30,483 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 13:34:30,483 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 13:34:30,721 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 13:34:30,721 INFO L299 CfgBuilder]: Removed 6 assume(true) statements. [2021-05-02 13:34:30,722 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:34:30 BoogieIcfgContainer [2021-05-02 13:34:30,722 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 13:34:30,723 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 13:34:30,723 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 13:34:30,725 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 13:34:30,725 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 01:34:30" (1/3) ... [2021-05-02 13:34:30,725 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26c8beef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:34:30, skipping insertion in model container [2021-05-02 13:34:30,725 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:34:30" (2/3) ... [2021-05-02 13:34:30,726 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26c8beef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:34:30, skipping insertion in model container [2021-05-02 13:34:30,726 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:34:30" (3/3) ... [2021-05-02 13:34:30,726 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_6.c [2021-05-02 13:34:30,746 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 13:34:30,748 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 13:34:30,759 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 13:34:30,772 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 13:34:30,772 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 13:34:30,772 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 13:34:30,772 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 13:34:30,772 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 13:34:30,772 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 13:34:30,772 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 13:34:30,772 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 13:34:30,787 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 20 states have (on average 1.7) internal successors, (34), 21 states have internal predecessors, (34), 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) [2021-05-02 13:34:30,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-05-02 13:34:30,790 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:30,790 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:30,790 INFO L428 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:30,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:30,796 INFO L82 PathProgramCache]: Analyzing trace with hash -1187922237, now seen corresponding path program 1 times [2021-05-02 13:34:30,802 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:30,802 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1913154878] [2021-05-02 13:34:30,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:30,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:30,956 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:30,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:30,968 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:34:30,968 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:30,969 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1913154878] [2021-05-02 13:34:30,969 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1913154878] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:34:30,969 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:34:30,969 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:34:30,970 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652369188] [2021-05-02 13:34:30,972 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:34:30,973 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:30,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:34:30,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:34:30,981 INFO L87 Difference]: Start difference. First operand has 26 states, 20 states have (on average 1.7) internal successors, (34), 21 states have internal predecessors, (34), 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 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 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) [2021-05-02 13:34:31,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:31,084 INFO L93 Difference]: Finished difference Result 58 states and 94 transitions. [2021-05-02 13:34:31,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:34:31,086 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 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 9 [2021-05-02 13:34:31,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:31,096 INFO L225 Difference]: With dead ends: 58 [2021-05-02 13:34:31,096 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 13:34:31,098 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 67.1ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:34:31,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 13:34:31,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 22. [2021-05-02 13:34:31,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 18 states have internal predecessors, (24), 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) [2021-05-02 13:34:31,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2021-05-02 13:34:31,134 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 9 [2021-05-02 13:34:31,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:31,134 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2021-05-02 13:34:31,134 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 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) [2021-05-02 13:34:31,135 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2021-05-02 13:34:31,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 13:34:31,135 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:31,135 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:31,135 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 13:34:31,135 INFO L428 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:31,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:31,136 INFO L82 PathProgramCache]: Analyzing trace with hash 1138963186, now seen corresponding path program 1 times [2021-05-02 13:34:31,136 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:31,136 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [775445616] [2021-05-02 13:34:31,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:31,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:31,192 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:31,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:31,200 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:34:31,201 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:31,201 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [775445616] [2021-05-02 13:34:31,201 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [775445616] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:34:31,201 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:34:31,201 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:34:31,201 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284974175] [2021-05-02 13:34:31,202 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:34:31,202 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:31,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:34:31,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:34:31,203 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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) [2021-05-02 13:34:31,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:31,260 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2021-05-02 13:34:31,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:34:31,261 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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 12 [2021-05-02 13:34:31,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:31,262 INFO L225 Difference]: With dead ends: 47 [2021-05-02 13:34:31,262 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 13:34:31,263 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 38.3ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:34:31,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 13:34:31,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 23. [2021-05-02 13:34:31,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 19 states have internal predecessors, (25), 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) [2021-05-02 13:34:31,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2021-05-02 13:34:31,267 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 12 [2021-05-02 13:34:31,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:31,268 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2021-05-02 13:34:31,268 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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) [2021-05-02 13:34:31,268 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2021-05-02 13:34:31,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 13:34:31,268 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:31,268 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:31,269 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 13:34:31,269 INFO L428 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:31,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:31,269 INFO L82 PathProgramCache]: Analyzing trace with hash 1811082743, now seen corresponding path program 1 times [2021-05-02 13:34:31,269 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:31,269 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1513966039] [2021-05-02 13:34:31,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:31,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:31,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:31,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:31,322 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:34:31,323 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:31,323 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1513966039] [2021-05-02 13:34:31,323 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1513966039] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:34:31,323 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:34:31,323 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:34:31,323 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747480088] [2021-05-02 13:34:31,324 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:34:31,324 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:31,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:34:31,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:34:31,325 INFO L87 Difference]: Start difference. First operand 23 states and 28 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 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) [2021-05-02 13:34:31,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:31,389 INFO L93 Difference]: Finished difference Result 47 states and 61 transitions. [2021-05-02 13:34:31,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:34:31,390 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 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 15 [2021-05-02 13:34:31,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:31,391 INFO L225 Difference]: With dead ends: 47 [2021-05-02 13:34:31,391 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 13:34:31,392 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 38.8ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:34:31,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 13:34:31,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 24. [2021-05-02 13:34:31,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 20 states have (on average 1.3) internal successors, (26), 20 states have internal predecessors, (26), 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) [2021-05-02 13:34:31,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2021-05-02 13:34:31,403 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 15 [2021-05-02 13:34:31,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:31,403 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2021-05-02 13:34:31,403 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 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) [2021-05-02 13:34:31,403 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2021-05-02 13:34:31,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 13:34:31,404 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:31,405 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:31,405 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 13:34:31,405 INFO L428 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:31,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:31,409 INFO L82 PathProgramCache]: Analyzing trace with hash 602992382, now seen corresponding path program 1 times [2021-05-02 13:34:31,409 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:31,409 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1161089849] [2021-05-02 13:34:31,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:31,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:31,460 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:31,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:31,467 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:34:31,467 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:31,467 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1161089849] [2021-05-02 13:34:31,468 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1161089849] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:34:31,468 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:34:31,468 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:34:31,468 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521627148] [2021-05-02 13:34:31,468 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:34:31,468 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:31,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:34:31,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:34:31,469 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 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) [2021-05-02 13:34:31,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:31,539 INFO L93 Difference]: Finished difference Result 47 states and 60 transitions. [2021-05-02 13:34:31,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:34:31,540 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 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 18 [2021-05-02 13:34:31,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:31,540 INFO L225 Difference]: With dead ends: 47 [2021-05-02 13:34:31,540 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 13:34:31,541 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 39.6ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:34:31,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 13:34:31,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2021-05-02 13:34:31,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 21 states have internal predecessors, (27), 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) [2021-05-02 13:34:31,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2021-05-02 13:34:31,545 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 18 [2021-05-02 13:34:31,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:31,545 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2021-05-02 13:34:31,545 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 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) [2021-05-02 13:34:31,545 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2021-05-02 13:34:31,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 13:34:31,545 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:31,545 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:31,546 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 13:34:31,546 INFO L428 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:31,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:31,546 INFO L82 PathProgramCache]: Analyzing trace with hash 257821531, now seen corresponding path program 1 times [2021-05-02 13:34:31,546 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:31,546 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [34039110] [2021-05-02 13:34:31,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:31,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:31,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:31,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:31,620 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:34:31,620 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:31,620 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [34039110] [2021-05-02 13:34:31,620 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [34039110] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:34:31,620 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:34:31,621 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:34:31,621 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076628426] [2021-05-02 13:34:31,621 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:34:31,621 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:31,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:34:31,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:34:31,622 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 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) [2021-05-02 13:34:31,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:31,689 INFO L93 Difference]: Finished difference Result 47 states and 59 transitions. [2021-05-02 13:34:31,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:34:31,690 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 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 21 [2021-05-02 13:34:31,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:31,691 INFO L225 Difference]: With dead ends: 47 [2021-05-02 13:34:31,691 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 13:34:31,692 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 43.6ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:34:31,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 13:34:31,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2021-05-02 13:34:31,703 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) [2021-05-02 13:34:31,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2021-05-02 13:34:31,704 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 21 [2021-05-02 13:34:31,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:31,705 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2021-05-02 13:34:31,705 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 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) [2021-05-02 13:34:31,705 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2021-05-02 13:34:31,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 13:34:31,706 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:31,706 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:31,706 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-02 13:34:31,707 INFO L428 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:31,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:31,707 INFO L82 PathProgramCache]: Analyzing trace with hash 479277370, now seen corresponding path program 1 times [2021-05-02 13:34:31,707 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:31,708 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1474283147] [2021-05-02 13:34:31,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:31,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:31,751 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:31,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:31,756 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:34:31,756 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:31,756 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1474283147] [2021-05-02 13:34:31,756 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1474283147] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:34:31,756 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:34:31,757 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:34:31,757 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [970910599] [2021-05-02 13:34:31,757 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:34:31,757 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:31,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:34:31,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:34:31,758 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 states have internal predecessors, (21), 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) [2021-05-02 13:34:31,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:31,809 INFO L93 Difference]: Finished difference Result 47 states and 58 transitions. [2021-05-02 13:34:31,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:34:31,810 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 states have internal predecessors, (21), 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 24 [2021-05-02 13:34:31,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:31,810 INFO L225 Difference]: With dead ends: 47 [2021-05-02 13:34:31,811 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 13:34:31,811 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 33.7ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:34:31,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 13:34:31,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2021-05-02 13:34:31,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 23 states have internal predecessors, (29), 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) [2021-05-02 13:34:31,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 32 transitions. [2021-05-02 13:34:31,815 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 32 transitions. Word has length 24 [2021-05-02 13:34:31,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:31,815 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 32 transitions. [2021-05-02 13:34:31,816 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 states have internal predecessors, (21), 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) [2021-05-02 13:34:31,816 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 32 transitions. [2021-05-02 13:34:31,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 13:34:31,816 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:31,816 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:31,816 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-02 13:34:31,816 INFO L428 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:31,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:31,817 INFO L82 PathProgramCache]: Analyzing trace with hash 939861656, now seen corresponding path program 1 times [2021-05-02 13:34:31,817 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:31,817 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [626238470] [2021-05-02 13:34:31,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:31,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:31,852 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:31,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:31,865 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:34:31,866 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:31,866 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [626238470] [2021-05-02 13:34:31,866 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [626238470] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:31,868 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1417443893] [2021-05-02 13:34:31,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:31,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:31,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 13:34:31,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:34:31,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:31,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,033 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:34:32,033 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1417443893] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:32,033 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:34:32,033 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 13:34:32,033 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97779168] [2021-05-02 13:34:32,034 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:34:32,034 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:32,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:34:32,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:34:32,034 INFO L87 Difference]: Start difference. First operand 27 states and 32 transitions. Second operand has 6 states, 6 states have (on average 4.5) internal successors, (27), 5 states have internal predecessors, (27), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:32,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:32,131 INFO L93 Difference]: Finished difference Result 50 states and 61 transitions. [2021-05-02 13:34:32,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 13:34:32,131 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 5 states have internal predecessors, (27), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-02 13:34:32,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:32,132 INFO L225 Difference]: With dead ends: 50 [2021-05-02 13:34:32,132 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 13:34:32,132 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 69.7ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:34:32,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 13:34:32,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2021-05-02 13:34:32,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 25 states have (on average 1.24) internal successors, (31), 25 states have internal predecessors, (31), 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) [2021-05-02 13:34:32,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 34 transitions. [2021-05-02 13:34:32,136 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 34 transitions. Word has length 26 [2021-05-02 13:34:32,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:32,136 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 34 transitions. [2021-05-02 13:34:32,136 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 5 states have internal predecessors, (27), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:32,136 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 34 transitions. [2021-05-02 13:34:32,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 13:34:32,137 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:32,137 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:32,340 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 13:34:32,341 INFO L428 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:32,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:32,341 INFO L82 PathProgramCache]: Analyzing trace with hash 1179729014, now seen corresponding path program 2 times [2021-05-02 13:34:32,341 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:32,342 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [737842067] [2021-05-02 13:34:32,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:32,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:32,377 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:32,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:32,381 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:34:32,382 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:32,382 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [737842067] [2021-05-02 13:34:32,382 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [737842067] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:32,382 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [976975849] [2021-05-02 13:34:32,382 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:32,422 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:34:32,422 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:34:32,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 13:34:32,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:34:32,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,469 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:32,507 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:34:32,507 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [976975849] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:32,507 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:34:32,507 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-05-02 13:34:32,507 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050857866] [2021-05-02 13:34:32,508 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:34:32,508 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:32,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:34:32,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:34:32,508 INFO L87 Difference]: Start difference. First operand 29 states and 34 transitions. Second operand has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 states have internal predecessors, (33), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:32,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:32,867 INFO L93 Difference]: Finished difference Result 73 states and 89 transitions. [2021-05-02 13:34:32,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 13:34:32,867 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 states have internal predecessors, (33), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-05-02 13:34:32,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:32,868 INFO L225 Difference]: With dead ends: 73 [2021-05-02 13:34:32,868 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 13:34:32,869 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 310.5ms TimeCoverageRelationStatistics Valid=117, Invalid=225, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:34:32,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 13:34:32,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 40. [2021-05-02 13:34:32,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 36 states have (on average 1.1944444444444444) internal successors, (43), 36 states have internal predecessors, (43), 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) [2021-05-02 13:34:32,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2021-05-02 13:34:32,877 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 28 [2021-05-02 13:34:32,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:32,877 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2021-05-02 13:34:32,877 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 states have internal predecessors, (33), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:32,877 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2021-05-02 13:34:32,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 13:34:32,878 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:32,878 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:33,078 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:33,079 INFO L428 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:33,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:33,079 INFO L82 PathProgramCache]: Analyzing trace with hash 932471675, now seen corresponding path program 3 times [2021-05-02 13:34:33,080 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:33,080 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823166956] [2021-05-02 13:34:33,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:33,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:33,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:33,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:33,119 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-05-02 13:34:33,119 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:33,119 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823166956] [2021-05-02 13:34:33,119 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1823166956] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:33,119 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1671518148] [2021-05-02 13:34:33,119 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:33,158 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 13:34:33,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:34:33,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 13:34:33,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:34:33,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:33,217 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:33,231 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-05-02 13:34:33,231 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1671518148] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:33,231 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:34:33,231 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 7 [2021-05-02 13:34:33,231 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482231009] [2021-05-02 13:34:33,232 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 13:34:33,232 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:33,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 13:34:33,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:34:33,233 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand has 7 states, 7 states have (on average 6.142857142857143) internal successors, (43), 6 states have internal predecessors, (43), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:33,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:33,508 INFO L93 Difference]: Finished difference Result 255 states and 301 transitions. [2021-05-02 13:34:33,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 13:34:33,509 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 6.142857142857143) internal successors, (43), 6 states have internal predecessors, (43), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2021-05-02 13:34:33,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:33,514 INFO L225 Difference]: With dead ends: 255 [2021-05-02 13:34:33,514 INFO L226 Difference]: Without dead ends: 222 [2021-05-02 13:34:33,516 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 177.6ms TimeCoverageRelationStatistics Valid=74, Invalid=136, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:34:33,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2021-05-02 13:34:33,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 112. [2021-05-02 13:34:33,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 108 states have (on average 1.1759259259259258) internal successors, (127), 108 states have internal predecessors, (127), 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) [2021-05-02 13:34:33,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 130 transitions. [2021-05-02 13:34:33,545 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 130 transitions. Word has length 39 [2021-05-02 13:34:33,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:33,545 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 130 transitions. [2021-05-02 13:34:33,546 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 6.142857142857143) internal successors, (43), 6 states have internal predecessors, (43), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:33,546 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 130 transitions. [2021-05-02 13:34:33,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-05-02 13:34:33,552 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:33,552 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 8, 8, 8, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:33,764 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:33,765 INFO L428 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:33,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:33,765 INFO L82 PathProgramCache]: Analyzing trace with hash 1857986275, now seen corresponding path program 4 times [2021-05-02 13:34:33,766 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:33,766 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [269254444] [2021-05-02 13:34:33,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:33,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:33,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:33,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:33,820 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 475 proven. 1 refuted. 0 times theorem prover too weak. 429 trivial. 0 not checked. [2021-05-02 13:34:33,821 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:33,821 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [269254444] [2021-05-02 13:34:33,821 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [269254444] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:33,821 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [515073060] [2021-05-02 13:34:33,821 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:33,871 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:34:33,871 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:34:33,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 13:34:33,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:34:33,913 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:33,915 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:33,926 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:33,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:33,937 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:33,938 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:34,041 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 199 proven. 9 refuted. 0 times theorem prover too weak. 697 trivial. 0 not checked. [2021-05-02 13:34:34,041 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [515073060] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:34,042 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:34:34,042 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 9 [2021-05-02 13:34:34,042 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584070541] [2021-05-02 13:34:34,042 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:34:34,042 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:34,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:34:34,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:34:34,043 INFO L87 Difference]: Start difference. First operand 112 states and 130 transitions. Second operand has 9 states, 9 states have (on average 5.444444444444445) internal successors, (49), 8 states have internal predecessors, (49), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:34,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:34,432 INFO L93 Difference]: Finished difference Result 466 states and 556 transitions. [2021-05-02 13:34:34,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 13:34:34,433 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.444444444444445) internal successors, (49), 8 states have internal predecessors, (49), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 111 [2021-05-02 13:34:34,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:34,434 INFO L225 Difference]: With dead ends: 466 [2021-05-02 13:34:34,434 INFO L226 Difference]: Without dead ends: 362 [2021-05-02 13:34:34,437 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 300.2ms TimeCoverageRelationStatistics Valid=170, Invalid=336, Unknown=0, NotChecked=0, Total=506 [2021-05-02 13:34:34,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 362 states. [2021-05-02 13:34:34,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 362 to 234. [2021-05-02 13:34:34,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 234 states, 230 states have (on average 1.1434782608695653) internal successors, (263), 230 states have internal predecessors, (263), 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) [2021-05-02 13:34:34,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 266 transitions. [2021-05-02 13:34:34,474 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 266 transitions. Word has length 111 [2021-05-02 13:34:34,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:34,474 INFO L480 AbstractCegarLoop]: Abstraction has 234 states and 266 transitions. [2021-05-02 13:34:34,474 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 5.444444444444445) internal successors, (49), 8 states have internal predecessors, (49), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:34,474 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 266 transitions. [2021-05-02 13:34:34,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 234 [2021-05-02 13:34:34,480 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:34,480 INFO L523 BasicCegarLoop]: trace histogram [64, 64, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:34,684 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:34,685 INFO L428 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:34,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:34,685 INFO L82 PathProgramCache]: Analyzing trace with hash 1818261995, now seen corresponding path program 5 times [2021-05-02 13:34:34,686 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:34,686 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1091491778] [2021-05-02 13:34:34,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:34,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:34,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:34,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:34,786 INFO L134 CoverageAnalysis]: Checked inductivity of 5698 backedges. 2904 proven. 1 refuted. 0 times theorem prover too weak. 2793 trivial. 0 not checked. [2021-05-02 13:34:34,786 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:34,786 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1091491778] [2021-05-02 13:34:34,786 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1091491778] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:34,786 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [329694882] [2021-05-02 13:34:34,787 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:34,838 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-05-02 13:34:34,838 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:34:34,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 13:34:34,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:34:34,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:34,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:34,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:34,972 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:34,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:34,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:34,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:35,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:35,153 INFO L134 CoverageAnalysis]: Checked inductivity of 5698 backedges. 2646 proven. 16 refuted. 0 times theorem prover too weak. 3036 trivial. 0 not checked. [2021-05-02 13:34:35,153 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [329694882] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:35,153 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:34:35,153 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 10 [2021-05-02 13:34:35,155 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1501248224] [2021-05-02 13:34:35,155 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:34:35,155 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:35,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:34:35,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:34:35,156 INFO L87 Difference]: Start difference. First operand 234 states and 266 transitions. Second operand has 10 states, 10 states have (on average 6.3) internal successors, (63), 9 states have internal predecessors, (63), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:35,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:35,696 INFO L93 Difference]: Finished difference Result 1038 states and 1212 transitions. [2021-05-02 13:34:35,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 13:34:35,696 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 6.3) internal successors, (63), 9 states have internal predecessors, (63), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 233 [2021-05-02 13:34:35,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:35,698 INFO L225 Difference]: With dead ends: 1038 [2021-05-02 13:34:35,699 INFO L226 Difference]: Without dead ends: 812 [2021-05-02 13:34:35,699 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 232 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 420.2ms TimeCoverageRelationStatistics Valid=233, Invalid=469, Unknown=0, NotChecked=0, Total=702 [2021-05-02 13:34:35,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 812 states. [2021-05-02 13:34:35,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 812 to 516. [2021-05-02 13:34:35,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 516 states, 512 states have (on average 1.123046875) internal successors, (575), 512 states have internal predecessors, (575), 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) [2021-05-02 13:34:35,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 516 states to 516 states and 578 transitions. [2021-05-02 13:34:35,746 INFO L78 Accepts]: Start accepts. Automaton has 516 states and 578 transitions. Word has length 233 [2021-05-02 13:34:35,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:35,747 INFO L480 AbstractCegarLoop]: Abstraction has 516 states and 578 transitions. [2021-05-02 13:34:35,747 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 6.3) internal successors, (63), 9 states have internal predecessors, (63), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:35,747 INFO L276 IsEmpty]: Start isEmpty. Operand 516 states and 578 transitions. [2021-05-02 13:34:35,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 516 [2021-05-02 13:34:35,751 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:35,752 INFO L523 BasicCegarLoop]: trace histogram [160, 160, 32, 32, 32, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:35,965 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-02 13:34:35,965 INFO L428 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:35,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:35,965 INFO L82 PathProgramCache]: Analyzing trace with hash -1707288285, now seen corresponding path program 6 times [2021-05-02 13:34:35,966 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:35,966 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [967698420] [2021-05-02 13:34:35,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:36,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:36,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:36,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:36,128 INFO L134 CoverageAnalysis]: Checked inductivity of 33195 backedges. 1979 proven. 25 refuted. 0 times theorem prover too weak. 31191 trivial. 0 not checked. [2021-05-02 13:34:36,128 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:36,128 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [967698420] [2021-05-02 13:34:36,129 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [967698420] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:36,129 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [278666437] [2021-05-02 13:34:36,129 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:36,224 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2021-05-02 13:34:36,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:34:36,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 13:34:36,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:34:36,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:36,350 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:36,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:36,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:36,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:36,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:36,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:36,367 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:36,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:36,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:36,679 INFO L134 CoverageAnalysis]: Checked inductivity of 33195 backedges. 12889 proven. 25 refuted. 0 times theorem prover too weak. 20281 trivial. 0 not checked. [2021-05-02 13:34:36,679 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [278666437] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:36,679 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:34:36,679 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 13:34:36,680 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [10985769] [2021-05-02 13:34:36,680 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:34:36,680 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:36,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:34:36,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:34:36,681 INFO L87 Difference]: Start difference. First operand 516 states and 578 transitions. Second operand has 10 states, 10 states have (on average 5.2) internal successors, (52), 9 states have internal predecessors, (52), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:36,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:36,914 INFO L93 Difference]: Finished difference Result 1074 states and 1229 transitions. [2021-05-02 13:34:36,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:34:36,914 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 5.2) internal successors, (52), 9 states have internal predecessors, (52), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 515 [2021-05-02 13:34:36,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:36,916 INFO L225 Difference]: With dead ends: 1074 [2021-05-02 13:34:36,916 INFO L226 Difference]: Without dead ends: 580 [2021-05-02 13:34:36,917 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 530 GetRequests, 516 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 148.5ms TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:34:36,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 580 states. [2021-05-02 13:34:36,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 580 to 580. [2021-05-02 13:34:36,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 580 states, 576 states have (on average 1.109375) internal successors, (639), 576 states have internal predecessors, (639), 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) [2021-05-02 13:34:36,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 580 states to 580 states and 642 transitions. [2021-05-02 13:34:36,990 INFO L78 Accepts]: Start accepts. Automaton has 580 states and 642 transitions. Word has length 515 [2021-05-02 13:34:36,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:36,991 INFO L480 AbstractCegarLoop]: Abstraction has 580 states and 642 transitions. [2021-05-02 13:34:36,991 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 5.2) internal successors, (52), 9 states have internal predecessors, (52), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:36,991 INFO L276 IsEmpty]: Start isEmpty. Operand 580 states and 642 transitions. [2021-05-02 13:34:37,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 580 [2021-05-02 13:34:37,002 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:37,002 INFO L523 BasicCegarLoop]: trace histogram [192, 192, 32, 32, 32, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:37,216 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:37,217 INFO L428 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:37,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:37,218 INFO L82 PathProgramCache]: Analyzing trace with hash -1673226973, now seen corresponding path program 7 times [2021-05-02 13:34:37,218 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:37,218 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1490798215] [2021-05-02 13:34:37,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:37,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:37,343 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:37,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:37,348 INFO L134 CoverageAnalysis]: Checked inductivity of 45451 backedges. 5336 proven. 89 refuted. 0 times theorem prover too weak. 40026 trivial. 0 not checked. [2021-05-02 13:34:37,349 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:37,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1490798215] [2021-05-02 13:34:37,349 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1490798215] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:37,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1881581562] [2021-05-02 13:34:37,349 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:37,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:37,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 1036 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 13:34:37,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:34:37,541 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:37,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:37,569 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:37,571 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:38,058 INFO L134 CoverageAnalysis]: Checked inductivity of 45451 backedges. 5336 proven. 89 refuted. 0 times theorem prover too weak. 40026 trivial. 0 not checked. [2021-05-02 13:34:38,058 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1881581562] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:38,058 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:34:38,059 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 13:34:38,059 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [875381457] [2021-05-02 13:34:38,060 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 13:34:38,060 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:38,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 13:34:38,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:34:38,062 INFO L87 Difference]: Start difference. First operand 580 states and 642 transitions. Second operand has 7 states, 7 states have (on average 6.428571428571429) internal successors, (45), 6 states have internal predecessors, (45), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:38,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:38,240 INFO L93 Difference]: Finished difference Result 1583 states and 1752 transitions. [2021-05-02 13:34:38,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:34:38,241 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 6.428571428571429) internal successors, (45), 6 states have internal predecessors, (45), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 579 [2021-05-02 13:34:38,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:38,244 INFO L225 Difference]: With dead ends: 1583 [2021-05-02 13:34:38,244 INFO L226 Difference]: Without dead ends: 1044 [2021-05-02 13:34:38,245 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 588 GetRequests, 580 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 72.1ms TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:34:38,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1044 states. [2021-05-02 13:34:38,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1044 to 820. [2021-05-02 13:34:38,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 820 states, 816 states have (on average 1.0968137254901962) internal successors, (895), 816 states have internal predecessors, (895), 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) [2021-05-02 13:34:38,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 820 states to 820 states and 898 transitions. [2021-05-02 13:34:38,323 INFO L78 Accepts]: Start accepts. Automaton has 820 states and 898 transitions. Word has length 579 [2021-05-02 13:34:38,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:38,324 INFO L480 AbstractCegarLoop]: Abstraction has 820 states and 898 transitions. [2021-05-02 13:34:38,324 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 6.428571428571429) internal successors, (45), 6 states have internal predecessors, (45), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:38,324 INFO L276 IsEmpty]: Start isEmpty. Operand 820 states and 898 transitions. [2021-05-02 13:34:38,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 820 [2021-05-02 13:34:38,329 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:38,329 INFO L523 BasicCegarLoop]: trace histogram [288, 288, 48, 48, 48, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:38,538 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:38,538 INFO L428 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:38,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:38,539 INFO L82 PathProgramCache]: Analyzing trace with hash -1899981277, now seen corresponding path program 8 times [2021-05-02 13:34:38,539 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:38,539 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610237795] [2021-05-02 13:34:38,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:38,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:38,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:38,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:38,683 INFO L134 CoverageAnalysis]: Checked inductivity of 101267 backedges. 11891 proven. 264 refuted. 0 times theorem prover too weak. 89112 trivial. 0 not checked. [2021-05-02 13:34:38,683 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:38,683 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610237795] [2021-05-02 13:34:38,683 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [610237795] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:38,683 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1904522072] [2021-05-02 13:34:38,683 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:38,932 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:34:38,932 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:34:38,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 1420 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 13:34:38,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:34:38,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:38,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:38,987 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:38,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:39,006 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:39,007 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:39,600 INFO L134 CoverageAnalysis]: Checked inductivity of 101267 backedges. 11891 proven. 264 refuted. 0 times theorem prover too weak. 89112 trivial. 0 not checked. [2021-05-02 13:34:39,600 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1904522072] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:39,601 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:34:39,601 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 13:34:39,601 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790370716] [2021-05-02 13:34:39,602 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:34:39,602 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:39,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:34:39,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:34:39,602 INFO L87 Difference]: Start difference. First operand 820 states and 898 transitions. Second operand has 8 states, 8 states have (on average 6.25) internal successors, (50), 7 states have internal predecessors, (50), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:39,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:39,853 INFO L93 Difference]: Finished difference Result 2048 states and 2248 transitions. [2021-05-02 13:34:39,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:34:39,853 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 6.25) internal successors, (50), 7 states have internal predecessors, (50), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 819 [2021-05-02 13:34:39,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:39,858 INFO L225 Difference]: With dead ends: 2048 [2021-05-02 13:34:39,858 INFO L226 Difference]: Without dead ends: 1284 [2021-05-02 13:34:39,859 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 830 GetRequests, 820 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 98.0ms TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:34:39,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1284 states. [2021-05-02 13:34:39,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1284 to 1060. [2021-05-02 13:34:39,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1060 states, 1056 states have (on average 1.089962121212121) internal successors, (1151), 1056 states have internal predecessors, (1151), 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) [2021-05-02 13:34:39,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1060 states to 1060 states and 1154 transitions. [2021-05-02 13:34:39,956 INFO L78 Accepts]: Start accepts. Automaton has 1060 states and 1154 transitions. Word has length 819 [2021-05-02 13:34:39,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:39,956 INFO L480 AbstractCegarLoop]: Abstraction has 1060 states and 1154 transitions. [2021-05-02 13:34:39,956 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 6.25) internal successors, (50), 7 states have internal predecessors, (50), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:39,957 INFO L276 IsEmpty]: Start isEmpty. Operand 1060 states and 1154 transitions. [2021-05-02 13:34:39,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1060 [2021-05-02 13:34:39,965 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:39,965 INFO L523 BasicCegarLoop]: trace histogram [384, 384, 64, 64, 64, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:40,182 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 13:34:40,182 INFO L428 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:40,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:40,183 INFO L82 PathProgramCache]: Analyzing trace with hash 445814563, now seen corresponding path program 9 times [2021-05-02 13:34:40,183 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:40,183 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [183681861] [2021-05-02 13:34:40,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:40,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:40,388 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:40,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:40,396 INFO L134 CoverageAnalysis]: Checked inductivity of 179355 backedges. 21056 proven. 526 refuted. 0 times theorem prover too weak. 157773 trivial. 0 not checked. [2021-05-02 13:34:40,396 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:40,396 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [183681861] [2021-05-02 13:34:40,396 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [183681861] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:40,396 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [481140044] [2021-05-02 13:34:40,396 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:40,538 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2021-05-02 13:34:40,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:34:40,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 13:34:40,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:34:41,566 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,597 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,614 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,616 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,635 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:41,651 INFO L134 CoverageAnalysis]: Checked inductivity of 179355 backedges. 21082 proven. 526 refuted. 0 times theorem prover too weak. 157747 trivial. 0 not checked. [2021-05-02 13:34:41,651 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [481140044] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:41,651 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:34:41,652 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 13:34:41,652 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [342570138] [2021-05-02 13:34:41,652 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:34:41,653 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:41,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:34:41,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:34:41,653 INFO L87 Difference]: Start difference. First operand 1060 states and 1154 transitions. Second operand has 9 states, 9 states have (on average 7.666666666666667) internal successors, (69), 8 states have internal predecessors, (69), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:41,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:41,935 INFO L93 Difference]: Finished difference Result 2513 states and 2744 transitions. [2021-05-02 13:34:41,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:34:41,936 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 7.666666666666667) internal successors, (69), 8 states have internal predecessors, (69), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 1059 [2021-05-02 13:34:41,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:41,939 INFO L225 Difference]: With dead ends: 2513 [2021-05-02 13:34:41,940 INFO L226 Difference]: Without dead ends: 1524 [2021-05-02 13:34:41,942 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 1072 GetRequests, 1060 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 116.8ms TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:34:41,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1524 states. [2021-05-02 13:34:42,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1524 to 1300. [2021-05-02 13:34:42,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1300 states, 1296 states have (on average 1.0856481481481481) internal successors, (1407), 1296 states have internal predecessors, (1407), 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) [2021-05-02 13:34:42,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1300 states to 1300 states and 1410 transitions. [2021-05-02 13:34:42,087 INFO L78 Accepts]: Start accepts. Automaton has 1300 states and 1410 transitions. Word has length 1059 [2021-05-02 13:34:42,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:42,088 INFO L480 AbstractCegarLoop]: Abstraction has 1300 states and 1410 transitions. [2021-05-02 13:34:42,088 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 7.666666666666667) internal successors, (69), 8 states have internal predecessors, (69), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:42,088 INFO L276 IsEmpty]: Start isEmpty. Operand 1300 states and 1410 transitions. [2021-05-02 13:34:42,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1300 [2021-05-02 13:34:42,102 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:42,103 INFO L523 BasicCegarLoop]: trace histogram [480, 480, 80, 80, 80, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:42,318 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 13:34:42,319 INFO L428 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:42,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:42,319 INFO L82 PathProgramCache]: Analyzing trace with hash 1891276835, now seen corresponding path program 10 times [2021-05-02 13:34:42,319 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:42,319 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [352286284] [2021-05-02 13:34:42,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:42,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:42,612 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:42,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:42,622 INFO L134 CoverageAnalysis]: Checked inductivity of 279715 backedges. 32831 proven. 875 refuted. 0 times theorem prover too weak. 246009 trivial. 0 not checked. [2021-05-02 13:34:42,622 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:42,622 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [352286284] [2021-05-02 13:34:42,622 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [352286284] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:42,622 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [435278499] [2021-05-02 13:34:42,622 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:42,951 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:34:42,952 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:34:42,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 2159 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 13:34:42,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:34:42,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:42,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:43,012 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:43,013 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:43,029 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:43,032 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:43,049 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:43,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:43,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:43,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:43,993 INFO L134 CoverageAnalysis]: Checked inductivity of 279715 backedges. 32831 proven. 875 refuted. 0 times theorem prover too weak. 246009 trivial. 0 not checked. [2021-05-02 13:34:43,994 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [435278499] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:43,994 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:34:43,994 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 13:34:43,994 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447587554] [2021-05-02 13:34:43,995 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:34:43,995 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:43,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:34:43,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:34:43,996 INFO L87 Difference]: Start difference. First operand 1300 states and 1410 transitions. Second operand has 10 states, 10 states have (on average 6.0) internal successors, (60), 9 states have internal predecessors, (60), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:44,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:44,314 INFO L93 Difference]: Finished difference Result 2754 states and 3000 transitions. [2021-05-02 13:34:44,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:34:44,315 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 6.0) internal successors, (60), 9 states have internal predecessors, (60), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 1299 [2021-05-02 13:34:44,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:44,319 INFO L225 Difference]: With dead ends: 2754 [2021-05-02 13:34:44,319 INFO L226 Difference]: Without dead ends: 1540 [2021-05-02 13:34:44,320 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 1314 GetRequests, 1300 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 142.6ms TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:34:44,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1540 states. [2021-05-02 13:34:44,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1540 to 1540. [2021-05-02 13:34:44,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1540 states, 1536 states have (on average 1.0826822916666667) internal successors, (1663), 1536 states have internal predecessors, (1663), 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) [2021-05-02 13:34:44,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1540 states to 1540 states and 1666 transitions. [2021-05-02 13:34:44,461 INFO L78 Accepts]: Start accepts. Automaton has 1540 states and 1666 transitions. Word has length 1299 [2021-05-02 13:34:44,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:44,461 INFO L480 AbstractCegarLoop]: Abstraction has 1540 states and 1666 transitions. [2021-05-02 13:34:44,461 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 6.0) internal successors, (60), 9 states have internal predecessors, (60), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:44,461 INFO L276 IsEmpty]: Start isEmpty. Operand 1540 states and 1666 transitions. [2021-05-02 13:34:44,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1540 [2021-05-02 13:34:44,477 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:44,477 INFO L523 BasicCegarLoop]: trace histogram [576, 576, 96, 96, 96, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:44,698 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 13:34:44,699 INFO L428 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:44,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:44,700 INFO L82 PathProgramCache]: Analyzing trace with hash 2075695395, now seen corresponding path program 11 times [2021-05-02 13:34:44,700 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:44,700 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1785214824] [2021-05-02 13:34:44,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:44,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:45,029 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:45,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:45,039 INFO L134 CoverageAnalysis]: Checked inductivity of 402347 backedges. 88169 proven. 3149 refuted. 0 times theorem prover too weak. 311029 trivial. 0 not checked. [2021-05-02 13:34:45,039 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:45,039 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1785214824] [2021-05-02 13:34:45,039 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1785214824] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:45,039 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [839533580] [2021-05-02 13:34:45,039 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:45,254 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 69 check-sat command(s) [2021-05-02 13:34:45,254 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:34:45,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 494 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 13:34:45,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:34:45,746 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:45,747 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:45,836 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:45,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:46,592 INFO L134 CoverageAnalysis]: Checked inductivity of 402347 backedges. 214138 proven. 3149 refuted. 0 times theorem prover too weak. 185060 trivial. 0 not checked. [2021-05-02 13:34:46,593 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [839533580] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:46,593 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:34:46,593 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 13:34:46,593 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [591587079] [2021-05-02 13:34:46,594 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 13:34:46,594 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:46,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 13:34:46,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:34:46,595 INFO L87 Difference]: Start difference. First operand 1540 states and 1666 transitions. Second operand has 7 states, 7 states have (on average 9.428571428571429) internal successors, (66), 6 states have internal predecessors, (66), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:46,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:46,927 INFO L93 Difference]: Finished difference Result 4364 states and 4721 transitions. [2021-05-02 13:34:46,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:34:46,927 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 9.428571428571429) internal successors, (66), 6 states have internal predecessors, (66), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 1539 [2021-05-02 13:34:46,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:46,933 INFO L225 Difference]: With dead ends: 4364 [2021-05-02 13:34:46,933 INFO L226 Difference]: Without dead ends: 3020 [2021-05-02 13:34:46,935 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 1548 GetRequests, 1540 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 68.7ms TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:34:46,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3020 states. [2021-05-02 13:34:47,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3020 to 2284. [2021-05-02 13:34:47,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2284 states, 2280 states have (on average 1.0802631578947368) internal successors, (2463), 2280 states have internal predecessors, (2463), 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) [2021-05-02 13:34:47,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2284 states to 2284 states and 2466 transitions. [2021-05-02 13:34:47,117 INFO L78 Accepts]: Start accepts. Automaton has 2284 states and 2466 transitions. Word has length 1539 [2021-05-02 13:34:47,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:47,118 INFO L480 AbstractCegarLoop]: Abstraction has 2284 states and 2466 transitions. [2021-05-02 13:34:47,118 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 9.428571428571429) internal successors, (66), 6 states have internal predecessors, (66), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:47,118 INFO L276 IsEmpty]: Start isEmpty. Operand 2284 states and 2466 transitions. [2021-05-02 13:34:47,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2284 [2021-05-02 13:34:47,149 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:47,150 INFO L523 BasicCegarLoop]: trace histogram [864, 864, 144, 144, 144, 24, 24, 24, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:47,360 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 13:34:47,361 INFO L428 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:47,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:47,362 INFO L82 PathProgramCache]: Analyzing trace with hash -747363677, now seen corresponding path program 12 times [2021-05-02 13:34:47,362 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:47,362 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [436523922] [2021-05-02 13:34:47,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:47,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:48,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:48,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:48,081 INFO L134 CoverageAnalysis]: Checked inductivity of 905559 backedges. 198328 proven. 9444 refuted. 0 times theorem prover too weak. 697787 trivial. 0 not checked. [2021-05-02 13:34:48,081 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:48,081 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [436523922] [2021-05-02 13:34:48,082 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [436523922] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:48,082 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [898850765] [2021-05-02 13:34:48,082 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:48,707 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 195 check-sat command(s) [2021-05-02 13:34:48,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:34:48,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 1195 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 13:34:48,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:34:50,755 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:50,756 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:50,846 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:50,847 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:50,938 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:50,939 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:50,967 INFO L134 CoverageAnalysis]: Checked inductivity of 905559 backedges. 198339 proven. 9444 refuted. 0 times theorem prover too weak. 697776 trivial. 0 not checked. [2021-05-02 13:34:50,967 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [898850765] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:50,968 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:34:50,968 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 13:34:50,968 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073613363] [2021-05-02 13:34:50,969 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:34:50,969 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:50,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:34:50,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:34:50,970 INFO L87 Difference]: Start difference. First operand 2284 states and 2466 transitions. Second operand has 8 states, 8 states have (on average 9.5) internal successors, (76), 7 states have internal predecessors, (76), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:51,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:51,442 INFO L93 Difference]: Finished difference Result 5759 states and 6221 transitions. [2021-05-02 13:34:51,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:34:51,442 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 9.5) internal successors, (76), 7 states have internal predecessors, (76), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 2283 [2021-05-02 13:34:51,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:51,450 INFO L225 Difference]: With dead ends: 5759 [2021-05-02 13:34:51,450 INFO L226 Difference]: Without dead ends: 3764 [2021-05-02 13:34:51,454 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 2294 GetRequests, 2284 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 90.8ms TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:34:51,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3764 states. [2021-05-02 13:34:51,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3764 to 3028. [2021-05-02 13:34:51,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3028 states, 3024 states have (on average 1.0790343915343916) internal successors, (3263), 3024 states have internal predecessors, (3263), 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) [2021-05-02 13:34:51,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3028 states to 3028 states and 3266 transitions. [2021-05-02 13:34:51,728 INFO L78 Accepts]: Start accepts. Automaton has 3028 states and 3266 transitions. Word has length 2283 [2021-05-02 13:34:51,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:51,728 INFO L480 AbstractCegarLoop]: Abstraction has 3028 states and 3266 transitions. [2021-05-02 13:34:51,728 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 9.5) internal successors, (76), 7 states have internal predecessors, (76), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:51,728 INFO L276 IsEmpty]: Start isEmpty. Operand 3028 states and 3266 transitions. [2021-05-02 13:34:51,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3028 [2021-05-02 13:34:51,782 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:51,783 INFO L523 BasicCegarLoop]: trace histogram [1152, 1152, 192, 192, 192, 32, 32, 32, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:51,994 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 13:34:51,994 INFO L428 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:51,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:51,995 INFO L82 PathProgramCache]: Analyzing trace with hash 973302819, now seen corresponding path program 13 times [2021-05-02 13:34:51,995 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:51,995 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1578702172] [2021-05-02 13:34:51,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:52,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:53,262 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:34:53,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:53,290 INFO L134 CoverageAnalysis]: Checked inductivity of 1610179 backedges. 352545 proven. 18886 refuted. 0 times theorem prover too weak. 1238748 trivial. 0 not checked. [2021-05-02 13:34:53,290 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:34:53,290 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1578702172] [2021-05-02 13:34:53,290 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1578702172] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:53,290 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2025144598] [2021-05-02 13:34:53,290 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:54,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:34:54,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 4972 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 13:34:54,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:34:54,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:54,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:54,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:54,268 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:54,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:54,359 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:54,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:54,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:34:56,434 INFO L134 CoverageAnalysis]: Checked inductivity of 1610179 backedges. 352545 proven. 18886 refuted. 0 times theorem prover too weak. 1238748 trivial. 0 not checked. [2021-05-02 13:34:56,434 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2025144598] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:34:56,434 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:34:56,435 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 13:34:56,435 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773434754] [2021-05-02 13:34:56,436 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:34:56,437 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:34:56,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:34:56,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:34:56,437 INFO L87 Difference]: Start difference. First operand 3028 states and 3266 transitions. Second operand has 9 states, 9 states have (on average 7.666666666666667) internal successors, (69), 8 states have internal predecessors, (69), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:56,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:34:57,000 INFO L93 Difference]: Finished difference Result 7154 states and 7721 transitions. [2021-05-02 13:34:57,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:34:57,000 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 7.666666666666667) internal successors, (69), 8 states have internal predecessors, (69), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 3027 [2021-05-02 13:34:57,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:34:57,026 INFO L225 Difference]: With dead ends: 7154 [2021-05-02 13:34:57,026 INFO L226 Difference]: Without dead ends: 4508 [2021-05-02 13:34:57,029 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 3040 GetRequests, 3028 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 146.5ms TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:34:57,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4508 states. [2021-05-02 13:34:57,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4508 to 3772. [2021-05-02 13:34:57,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3772 states, 3768 states have (on average 1.0782908704883227) internal successors, (4063), 3768 states have internal predecessors, (4063), 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) [2021-05-02 13:34:57,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3772 states to 3772 states and 4066 transitions. [2021-05-02 13:34:57,468 INFO L78 Accepts]: Start accepts. Automaton has 3772 states and 4066 transitions. Word has length 3027 [2021-05-02 13:34:57,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:34:57,469 INFO L480 AbstractCegarLoop]: Abstraction has 3772 states and 4066 transitions. [2021-05-02 13:34:57,469 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 7.666666666666667) internal successors, (69), 8 states have internal predecessors, (69), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:34:57,469 INFO L276 IsEmpty]: Start isEmpty. Operand 3772 states and 4066 transitions. [2021-05-02 13:34:57,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3772 [2021-05-02 13:34:57,553 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:34:57,554 INFO L523 BasicCegarLoop]: trace histogram [1440, 1440, 240, 240, 240, 40, 40, 40, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:34:57,754 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:34:57,754 INFO L428 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:34:57,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:34:57,755 INFO L82 PathProgramCache]: Analyzing trace with hash -1235257949, now seen corresponding path program 14 times [2021-05-02 13:34:57,755 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:34:57,755 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [972966346] [2021-05-02 13:34:57,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:34:58,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:35:00,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:35:00,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:35:00,115 INFO L134 CoverageAnalysis]: Checked inductivity of 2516207 backedges. 550820 proven. 31475 refuted. 0 times theorem prover too weak. 1933912 trivial. 0 not checked. [2021-05-02 13:35:00,115 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:35:00,116 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [972966346] [2021-05-02 13:35:00,116 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [972966346] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:35:00,116 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [586880839] [2021-05-02 13:35:00,116 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:35:00,969 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:35:00,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:35:00,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 6172 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 13:35:01,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:35:01,116 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:01,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:01,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:01,202 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:01,287 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:01,288 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:01,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:01,399 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:01,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:01,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:04,156 INFO L134 CoverageAnalysis]: Checked inductivity of 2516207 backedges. 550820 proven. 31475 refuted. 0 times theorem prover too weak. 1933912 trivial. 0 not checked. [2021-05-02 13:35:04,156 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [586880839] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:35:04,156 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:35:04,157 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 13:35:04,157 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024493196] [2021-05-02 13:35:04,159 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:35:04,159 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:35:04,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:35:04,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:35:04,159 INFO L87 Difference]: Start difference. First operand 3772 states and 4066 transitions. Second operand has 10 states, 10 states have (on average 7.7) internal successors, (77), 9 states have internal predecessors, (77), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:35:04,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:35:04,839 INFO L93 Difference]: Finished difference Result 7813 states and 8429 transitions. [2021-05-02 13:35:04,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:35:04,839 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 7.7) internal successors, (77), 9 states have internal predecessors, (77), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 3771 [2021-05-02 13:35:04,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:35:04,850 INFO L225 Difference]: With dead ends: 7813 [2021-05-02 13:35:04,850 INFO L226 Difference]: Without dead ends: 4516 [2021-05-02 13:35:04,855 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 3786 GetRequests, 3772 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 156.0ms TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:35:04,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4516 states. [2021-05-02 13:35:05,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4516 to 4516. [2021-05-02 13:35:05,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4516 states, 4512 states have (on average 1.0777925531914894) internal successors, (4863), 4512 states have internal predecessors, (4863), 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) [2021-05-02 13:35:05,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4516 states to 4516 states and 4866 transitions. [2021-05-02 13:35:05,284 INFO L78 Accepts]: Start accepts. Automaton has 4516 states and 4866 transitions. Word has length 3771 [2021-05-02 13:35:05,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:35:05,285 INFO L480 AbstractCegarLoop]: Abstraction has 4516 states and 4866 transitions. [2021-05-02 13:35:05,285 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 7.7) internal successors, (77), 9 states have internal predecessors, (77), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:35:05,285 INFO L276 IsEmpty]: Start isEmpty. Operand 4516 states and 4866 transitions. [2021-05-02 13:35:05,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4516 [2021-05-02 13:35:05,444 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:35:05,445 INFO L523 BasicCegarLoop]: trace histogram [1728, 1728, 288, 288, 288, 48, 48, 48, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:35:05,645 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:35:05,646 INFO L428 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:35:05,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:35:05,646 INFO L82 PathProgramCache]: Analyzing trace with hash -487309533, now seen corresponding path program 15 times [2021-05-02 13:35:05,647 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:35:05,647 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [237232252] [2021-05-02 13:35:05,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:35:06,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:35:08,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:35:08,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:35:08,269 INFO L134 CoverageAnalysis]: Checked inductivity of 3623643 backedges. 1359706 proven. 113309 refuted. 0 times theorem prover too weak. 2150628 trivial. 0 not checked. [2021-05-02 13:35:08,270 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:35:08,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [237232252] [2021-05-02 13:35:08,270 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [237232252] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:35:08,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [629517878] [2021-05-02 13:35:08,270 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:35:09,994 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 378 check-sat command(s) [2021-05-02 13:35:09,994 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:35:10,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 2395 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 13:35:10,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:35:14,040 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:14,041 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:14,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:14,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:14,716 INFO L134 CoverageAnalysis]: Checked inductivity of 3623643 backedges. 1359710 proven. 113309 refuted. 0 times theorem prover too weak. 2150624 trivial. 0 not checked. [2021-05-02 13:35:14,716 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [629517878] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:35:14,717 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:35:14,717 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 13:35:14,717 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247119987] [2021-05-02 13:35:14,719 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 13:35:14,719 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:35:14,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 13:35:14,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:35:14,720 INFO L87 Difference]: Start difference. First operand 4516 states and 4866 transitions. Second operand has 7 states, 7 states have (on average 11.0) internal successors, (77), 6 states have internal predecessors, (77), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:35:15,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:35:15,629 INFO L93 Difference]: Finished difference Result 12385 states and 13346 transitions. [2021-05-02 13:35:15,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:35:15,631 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 11.0) internal successors, (77), 6 states have internal predecessors, (77), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 4515 [2021-05-02 13:35:15,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:35:15,651 INFO L225 Difference]: With dead ends: 12385 [2021-05-02 13:35:15,651 INFO L226 Difference]: Without dead ends: 9000 [2021-05-02 13:35:15,657 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4524 GetRequests, 4516 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 73.3ms TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:35:15,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9000 states. [2021-05-02 13:35:16,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9000 to 6760. [2021-05-02 13:35:16,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6760 states, 6756 states have (on average 1.0774126702190645) internal successors, (7279), 6756 states have internal predecessors, (7279), 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) [2021-05-02 13:35:16,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6760 states to 6760 states and 7282 transitions. [2021-05-02 13:35:16,352 INFO L78 Accepts]: Start accepts. Automaton has 6760 states and 7282 transitions. Word has length 4515 [2021-05-02 13:35:16,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:35:16,353 INFO L480 AbstractCegarLoop]: Abstraction has 6760 states and 7282 transitions. [2021-05-02 13:35:16,353 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 11.0) internal successors, (77), 6 states have internal predecessors, (77), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:35:16,354 INFO L276 IsEmpty]: Start isEmpty. Operand 6760 states and 7282 transitions. [2021-05-02 13:35:16,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6760 [2021-05-02 13:35:16,622 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:35:16,623 INFO L523 BasicCegarLoop]: trace histogram [2592, 2592, 432, 432, 432, 72, 72, 72, 12, 12, 12, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:35:16,824 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-05-02 13:35:16,824 INFO L428 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:35:16,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:35:16,825 INFO L82 PathProgramCache]: Analyzing trace with hash 1939702755, now seen corresponding path program 16 times [2021-05-02 13:35:16,825 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:35:16,826 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [634145100] [2021-05-02 13:35:16,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:35:18,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:35:24,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:35:24,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:35:25,059 INFO L134 CoverageAnalysis]: Checked inductivity of 8154817 backedges. 3059317 proven. 339924 refuted. 0 times theorem prover too weak. 4755576 trivial. 0 not checked. [2021-05-02 13:35:25,060 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:35:25,060 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [634145100] [2021-05-02 13:35:25,060 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [634145100] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:35:25,060 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [204530868] [2021-05-02 13:35:25,060 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:35:26,744 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:35:26,744 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:35:26,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 10967 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 13:35:26,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:35:27,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:27,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:28,090 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:28,092 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:28,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:28,662 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:32,703 INFO L134 CoverageAnalysis]: Checked inductivity of 8154817 backedges. 3059317 proven. 339924 refuted. 0 times theorem prover too weak. 4755576 trivial. 0 not checked. [2021-05-02 13:35:32,703 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [204530868] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:35:32,703 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:35:32,704 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 13:35:32,704 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601552868] [2021-05-02 13:35:32,707 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:35:32,707 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:35:32,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:35:32,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:35:32,708 INFO L87 Difference]: Start difference. First operand 6760 states and 7282 transitions. Second operand has 8 states, 8 states have (on average 9.0) internal successors, (72), 7 states have internal predecessors, (72), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:35:33,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:35:33,977 INFO L93 Difference]: Finished difference Result 16312 states and 17574 transitions. [2021-05-02 13:35:33,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:35:33,979 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 9.0) internal successors, (72), 7 states have internal predecessors, (72), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 6759 [2021-05-02 13:35:33,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:35:33,993 INFO L225 Difference]: With dead ends: 16312 [2021-05-02 13:35:33,994 INFO L226 Difference]: Without dead ends: 11244 [2021-05-02 13:35:34,000 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6770 GetRequests, 6760 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 128.1ms TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:35:34,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11244 states. [2021-05-02 13:35:34,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11244 to 9004. [2021-05-02 13:35:34,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9004 states, 9000 states have (on average 1.0772222222222223) internal successors, (9695), 9000 states have internal predecessors, (9695), 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) [2021-05-02 13:35:34,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9004 states to 9004 states and 9698 transitions. [2021-05-02 13:35:34,954 INFO L78 Accepts]: Start accepts. Automaton has 9004 states and 9698 transitions. Word has length 6759 [2021-05-02 13:35:34,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:35:34,956 INFO L480 AbstractCegarLoop]: Abstraction has 9004 states and 9698 transitions. [2021-05-02 13:35:34,956 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 9.0) internal successors, (72), 7 states have internal predecessors, (72), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:35:34,956 INFO L276 IsEmpty]: Start isEmpty. Operand 9004 states and 9698 transitions. [2021-05-02 13:35:35,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9004 [2021-05-02 13:35:35,515 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:35:35,518 INFO L523 BasicCegarLoop]: trace histogram [3456, 3456, 576, 576, 576, 96, 96, 96, 16, 16, 16, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:35:35,718 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:35:35,719 INFO L428 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:35:35,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:35:35,720 INFO L82 PathProgramCache]: Analyzing trace with hash 664886947, now seen corresponding path program 17 times [2021-05-02 13:35:35,720 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:35:35,720 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [722045553] [2021-05-02 13:35:35,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:35:39,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:35:47,088 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:35:47,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:35:47,345 INFO L134 CoverageAnalysis]: Checked inductivity of 14498903 backedges. 5438770 proven. 679846 refuted. 0 times theorem prover too weak. 8380287 trivial. 0 not checked. [2021-05-02 13:35:47,345 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:35:47,345 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [722045553] [2021-05-02 13:35:47,345 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [722045553] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:35:47,345 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [628643599] [2021-05-02 13:35:47,345 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:35:53,152 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 722 check-sat command(s) [2021-05-02 13:35:53,152 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:35:53,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 6497 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 13:35:53,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:35:56,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:56,175 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:56,733 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:56,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:57,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:57,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:57,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:35:57,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:36:01,615 INFO L134 CoverageAnalysis]: Checked inductivity of 14498903 backedges. 9064618 proven. 679846 refuted. 0 times theorem prover too weak. 4754439 trivial. 0 not checked. [2021-05-02 13:36:01,616 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [628643599] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:36:01,616 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:36:01,617 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 13:36:01,617 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749564783] [2021-05-02 13:36:01,620 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:36:01,620 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:36:01,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:36:01,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:36:01,621 INFO L87 Difference]: Start difference. First operand 9004 states and 9698 transitions. Second operand has 9 states, 9 states have (on average 10.777777777777779) internal successors, (97), 8 states have internal predecessors, (97), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:36:03,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:36:03,176 INFO L93 Difference]: Finished difference Result 20239 states and 21802 transitions. [2021-05-02 13:36:03,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:36:03,177 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 10.777777777777779) internal successors, (97), 8 states have internal predecessors, (97), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9003 [2021-05-02 13:36:03,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:36:03,197 INFO L225 Difference]: With dead ends: 20239 [2021-05-02 13:36:03,197 INFO L226 Difference]: Without dead ends: 13488 [2021-05-02 13:36:03,207 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 9016 GetRequests, 9004 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 117.9ms TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:36:03,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13488 states. [2021-05-02 13:36:04,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13488 to 11248. [2021-05-02 13:36:04,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11248 states, 11244 states have (on average 1.0771077908217717) internal successors, (12111), 11244 states have internal predecessors, (12111), 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) [2021-05-02 13:36:04,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11248 states to 11248 states and 12114 transitions. [2021-05-02 13:36:04,456 INFO L78 Accepts]: Start accepts. Automaton has 11248 states and 12114 transitions. Word has length 9003 [2021-05-02 13:36:04,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:36:04,459 INFO L480 AbstractCegarLoop]: Abstraction has 11248 states and 12114 transitions. [2021-05-02 13:36:04,460 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 10.777777777777779) internal successors, (97), 8 states have internal predecessors, (97), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:36:04,460 INFO L276 IsEmpty]: Start isEmpty. Operand 11248 states and 12114 transitions. [2021-05-02 13:36:05,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11248 [2021-05-02 13:36:05,242 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:36:05,245 INFO L523 BasicCegarLoop]: trace histogram [4320, 4320, 720, 720, 720, 120, 120, 120, 20, 20, 20, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:36:05,449 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 13:36:05,449 INFO L428 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:36:05,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:36:05,451 INFO L82 PathProgramCache]: Analyzing trace with hash -350498973, now seen corresponding path program 18 times [2021-05-02 13:36:05,451 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:36:05,451 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [993594796] [2021-05-02 13:36:05,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:36:10,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:36:21,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:36:21,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:36:22,268 INFO L134 CoverageAnalysis]: Checked inductivity of 22655901 backedges. 8498065 proven. 1133075 refuted. 0 times theorem prover too weak. 13024761 trivial. 0 not checked. [2021-05-02 13:36:22,268 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:36:22,268 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [993594796] [2021-05-02 13:36:22,268 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [993594796] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:36:22,268 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1932096334] [2021-05-02 13:36:22,269 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:36:59,423 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 1505 check-sat command(s) [2021-05-02 13:36:59,423 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:36:59,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 11464 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 13:36:59,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:37:08,405 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:08,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:08,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:08,972 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:09,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:09,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:10,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:10,103 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:10,656 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:10,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:37:11,249 INFO L134 CoverageAnalysis]: Checked inductivity of 22655901 backedges. 8498069 proven. 1133075 refuted. 0 times theorem prover too weak. 13024757 trivial. 0 not checked. [2021-05-02 13:37:11,249 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1932096334] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:37:11,249 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:37:11,251 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 13:37:11,251 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111938806] [2021-05-02 13:37:11,253 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:37:11,253 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:37:11,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:37:11,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:37:11,253 INFO L87 Difference]: Start difference. First operand 11248 states and 12114 transitions. Second operand has 10 states, 10 states have (on average 11.0) internal successors, (110), 9 states have internal predecessors, (110), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:37:12,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:37:12,709 INFO L93 Difference]: Finished difference Result 21926 states and 23618 transitions. [2021-05-02 13:37:12,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:37:12,710 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 11.0) internal successors, (110), 9 states have internal predecessors, (110), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11247 [2021-05-02 13:37:12,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:37:12,726 INFO L225 Difference]: With dead ends: 21926 [2021-05-02 13:37:12,727 INFO L226 Difference]: Without dead ends: 13492 [2021-05-02 13:37:12,737 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11262 GetRequests, 11248 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 172.5ms TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:37:12,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13492 states. [2021-05-02 13:37:14,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13492 to 13492. [2021-05-02 13:37:14,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13492 states, 13488 states have (on average 1.0770314353499406) internal successors, (14527), 13488 states have internal predecessors, (14527), 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) [2021-05-02 13:37:14,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13492 states to 13492 states and 14530 transitions. [2021-05-02 13:37:14,160 INFO L78 Accepts]: Start accepts. Automaton has 13492 states and 14530 transitions. Word has length 11247 [2021-05-02 13:37:14,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:37:14,162 INFO L480 AbstractCegarLoop]: Abstraction has 13492 states and 14530 transitions. [2021-05-02 13:37:14,162 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 11.0) internal successors, (110), 9 states have internal predecessors, (110), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:37:14,163 INFO L276 IsEmpty]: Start isEmpty. Operand 13492 states and 14530 transitions. [2021-05-02 13:37:15,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13492 [2021-05-02 13:37:15,228 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:37:15,231 INFO L523 BasicCegarLoop]: trace histogram [5184, 5184, 864, 864, 864, 144, 144, 144, 24, 24, 24, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:37:15,444 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-02 13:37:15,445 INFO L428 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:37:15,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:37:15,447 INFO L82 PathProgramCache]: Analyzing trace with hash 1805385251, now seen corresponding path program 19 times [2021-05-02 13:37:15,447 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:37:15,447 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1465286108] [2021-05-02 13:37:15,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:37:24,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat