/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/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loops/heavy-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 17:37:08,407 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 17:37:08,409 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 17:37:08,439 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 17:37:08,455 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 17:37:08,456 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 17:37:08,457 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 17:37:08,458 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 17:37:08,460 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 17:37:08,461 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 17:37:08,462 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 17:37:08,466 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 17:37:08,467 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 17:37:08,468 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 17:37:08,469 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 17:37:08,470 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 17:37:08,475 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 17:37:08,481 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 17:37:08,482 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 17:37:08,482 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 17:37:08,486 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 17:37:08,498 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 17:37:08,499 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 17:37:08,501 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 17:37:08,501 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 17:37:08,501 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 17:37:08,501 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 17:37:08,501 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 17:37:08,501 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 17:37:08,501 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 17:37:08,501 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 17:37:08,502 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 17:37:08,502 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 17:37:08,502 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 17:37:08,502 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 17:37:08,503 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 17:37:08,503 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 17:37:08,503 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 17:37:08,503 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 17:37:08,503 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:37:08,503 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 17:37:08,503 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 17:37:08,504 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 17:37:08,504 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 17:37:08,855 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 17:37:08,872 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 17:37:08,874 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 17:37:08,875 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 17:37:08,876 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 17:37:08,877 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-1.c [2021-05-02 17:37:08,927 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/40487d8c2/456a1d47a8014bfa996d1d5069c12a91/FLAG8416c354c [2021-05-02 17:37:09,315 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 17:37:09,316 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/heavy-1.c [2021-05-02 17:37:09,320 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/40487d8c2/456a1d47a8014bfa996d1d5069c12a91/FLAG8416c354c [2021-05-02 17:37:09,330 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/40487d8c2/456a1d47a8014bfa996d1d5069c12a91 [2021-05-02 17:37:09,332 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 17:37:09,333 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 17:37:09,334 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 17:37:09,334 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 17:37:09,336 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 17:37:09,337 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:37:09" (1/1) ... [2021-05-02 17:37:09,337 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3e731401 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:09, skipping insertion in model container [2021-05-02 17:37:09,337 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:37:09" (1/1) ... [2021-05-02 17:37:09,342 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 17:37:09,349 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 17:37:09,453 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/heavy-1.c[600,613] [2021-05-02 17:37:09,458 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:37:09,509 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 17:37:09,558 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/heavy-1.c[600,613] [2021-05-02 17:37:09,558 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:37:09,593 INFO L208 MainTranslator]: Completed translation [2021-05-02 17:37:09,594 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:09 WrapperNode [2021-05-02 17:37:09,594 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 17:37:09,594 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 17:37:09,594 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 17:37:09,594 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 17:37:09,602 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:09" (1/1) ... [2021-05-02 17:37:09,602 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:09" (1/1) ... [2021-05-02 17:37:09,607 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:09" (1/1) ... [2021-05-02 17:37:09,607 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:09" (1/1) ... [2021-05-02 17:37:09,619 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:09" (1/1) ... [2021-05-02 17:37:09,622 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:09" (1/1) ... [2021-05-02 17:37:09,623 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:09" (1/1) ... [2021-05-02 17:37:09,629 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 17:37:09,630 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 17:37:09,630 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 17:37:09,630 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 17:37:09,631 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:09" (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 17:37:09,687 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 17:37:09,687 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 17:37:09,687 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 17:37:09,687 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 17:37:09,687 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 17:37:09,688 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 17:37:09,688 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 17:37:09,688 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 17:37:09,688 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 17:37:09,688 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 17:37:09,688 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 17:37:09,688 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 17:37:09,688 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 17:37:09,689 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2021-05-02 17:37:09,689 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 17:37:09,689 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 17:37:09,948 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 17:37:09,949 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-05-02 17:37:09,950 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:37:09 BoogieIcfgContainer [2021-05-02 17:37:09,950 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 17:37:09,950 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 17:37:09,950 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 17:37:09,951 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 17:37:09,953 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:37:09" (1/1) ... [2021-05-02 17:37:09,964 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 05:37:09 BasicIcfg [2021-05-02 17:37:09,964 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 17:37:09,965 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 17:37:09,965 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 17:37:09,967 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 17:37:09,967 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 05:37:09" (1/4) ... [2021-05-02 17:37:09,968 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@754e0c34 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:37:09, skipping insertion in model container [2021-05-02 17:37:09,968 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:09" (2/4) ... [2021-05-02 17:37:09,968 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@754e0c34 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:37:09, skipping insertion in model container [2021-05-02 17:37:09,968 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:37:09" (3/4) ... [2021-05-02 17:37:09,968 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@754e0c34 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 05:37:09, skipping insertion in model container [2021-05-02 17:37:09,969 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 05:37:09" (4/4) ... [2021-05-02 17:37:09,969 INFO L111 eAbstractionObserver]: Analyzing ICFG heavy-1.cJordan [2021-05-02 17:37:09,973 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 17:37:09,976 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 17:37:09,986 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 17:37:09,999 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 17:37:09,999 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 17:37:09,999 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 17:37:09,999 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 17:37:09,999 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 17:37:09,999 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 17:37:09,999 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 17:37:10,000 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 17:37:10,013 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 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 17:37:10,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-05-02 17:37:10,018 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:10,018 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:10,018 INFO L428 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:10,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:10,022 INFO L82 PathProgramCache]: Analyzing trace with hash 1140822413, now seen corresponding path program 1 times [2021-05-02 17:37:10,027 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:10,028 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [297451408] [2021-05-02 17:37:10,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:10,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,259 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:10,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,279 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:37:10,279 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:10,279 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [297451408] [2021-05-02 17:37:10,280 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [297451408] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:37:10,281 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:37:10,281 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 17:37:10,281 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [26501984] [2021-05-02 17:37:10,287 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 17:37:10,287 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:10,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 17:37:10,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:37:10,296 INFO L87 Difference]: Start difference. First operand has 19 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 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 17:37:10,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:10,436 INFO L93 Difference]: Finished difference Result 39 states and 48 transitions. [2021-05-02 17:37:10,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 17:37:10,437 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 17:37:10,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:10,455 INFO L225 Difference]: With dead ends: 39 [2021-05-02 17:37:10,456 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 17:37:10,457 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 106.2ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:37:10,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 17:37:10,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2021-05-02 17:37:10,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 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 17:37:10,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-05-02 17:37:10,493 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2021-05-02 17:37:10,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:10,494 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-05-02 17:37:10,494 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 17:37:10,494 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-05-02 17:37:10,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 17:37:10,494 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:10,494 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:10,495 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 17:37:10,495 INFO L428 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:10,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:10,495 INFO L82 PathProgramCache]: Analyzing trace with hash 195845143, now seen corresponding path program 1 times [2021-05-02 17:37:10,495 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:10,495 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2061030423] [2021-05-02 17:37:10,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:10,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,571 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:10,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,597 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 17:37:10,598 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:10,598 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2061030423] [2021-05-02 17:37:10,598 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2061030423] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:37:10,598 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:37:10,598 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 17:37:10,598 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790493045] [2021-05-02 17:37:10,599 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 17:37:10,599 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:10,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 17:37:10,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:37:10,600 INFO L87 Difference]: Start difference. First operand 16 states and 18 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 17:37:10,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:10,712 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2021-05-02 17:37:10,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 17:37:10,712 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 17:37:10,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:10,713 INFO L225 Difference]: With dead ends: 31 [2021-05-02 17:37:10,713 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 17:37:10,714 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 68.8ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:37:10,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 17:37:10,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 17. [2021-05-02 17:37:10,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 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 17:37:10,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-05-02 17:37:10,716 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2021-05-02 17:37:10,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:10,716 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-05-02 17:37:10,716 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 17:37:10,716 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-05-02 17:37:10,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 17:37:10,717 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:10,717 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:10,717 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 17:37:10,717 INFO L428 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:10,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:10,717 INFO L82 PathProgramCache]: Analyzing trace with hash 1483649217, now seen corresponding path program 1 times [2021-05-02 17:37:10,717 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:10,718 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [811446991] [2021-05-02 17:37:10,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:10,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:10,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,831 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 17:37:10,831 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:10,831 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [811446991] [2021-05-02 17:37:10,832 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [811446991] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:37:10,832 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:37:10,832 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 17:37:10,832 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672653398] [2021-05-02 17:37:10,832 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 17:37:10,832 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:10,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 17:37:10,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:37:10,833 INFO L87 Difference]: Start difference. First operand 17 states and 19 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 17:37:10,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:10,895 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2021-05-02 17:37:10,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 17:37:10,896 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 17:37:10,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:10,896 INFO L225 Difference]: With dead ends: 21 [2021-05-02 17:37:10,896 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 17:37:10,897 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 74.0ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:37:10,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 17:37:10,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2021-05-02 17:37:10,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 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 17:37:10,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2021-05-02 17:37:10,899 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2021-05-02 17:37:10,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:10,899 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2021-05-02 17:37:10,899 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 17:37:10,899 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2021-05-02 17:37:10,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 17:37:10,899 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:10,899 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:10,900 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 17:37:10,900 INFO L428 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:10,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:10,900 INFO L82 PathProgramCache]: Analyzing trace with hash 1830037535, now seen corresponding path program 1 times [2021-05-02 17:37:10,900 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:10,900 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1700376057] [2021-05-02 17:37:10,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:10,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,979 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:10,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,986 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:37:10,986 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:10,986 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1700376057] [2021-05-02 17:37:10,986 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1700376057] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:10,986 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1179967418] [2021-05-02 17:37:10,986 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 17:37:11,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:11,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 17:37:11,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:11,183 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:37:11,183 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1179967418] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:11,183 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:11,184 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 17:37:11,184 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136192481] [2021-05-02 17:37:11,184 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 17:37:11,184 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:11,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 17:37:11,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:37:11,185 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 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 17:37:11,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:11,288 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2021-05-02 17:37:11,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 17:37:11,288 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 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 17 [2021-05-02 17:37:11,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:11,290 INFO L225 Difference]: With dead ends: 23 [2021-05-02 17:37:11,291 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 17:37:11,291 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 67.9ms TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:37:11,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 17:37:11,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2021-05-02 17:37:11,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 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 17:37:11,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2021-05-02 17:37:11,298 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2021-05-02 17:37:11,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:11,298 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2021-05-02 17:37:11,298 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 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 17:37:11,298 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2021-05-02 17:37:11,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 17:37:11,299 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:11,299 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:11,513 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:11,513 INFO L428 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:11,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:11,514 INFO L82 PathProgramCache]: Analyzing trace with hash -298237955, now seen corresponding path program 2 times [2021-05-02 17:37:11,514 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:11,514 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803305748] [2021-05-02 17:37:11,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:11,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:11,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:11,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:11,617 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:37:11,617 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:11,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803305748] [2021-05-02 17:37:11,617 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [803305748] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:11,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968504292] [2021-05-02 17:37:11,618 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 17:37:11,661 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:37:11,661 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:37:11,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 17:37:11,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:11,734 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 17:37:11,735 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [968504292] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:11,735 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:11,735 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2021-05-02 17:37:11,735 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354473051] [2021-05-02 17:37:11,735 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 17:37:11,735 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:11,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 17:37:11,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:37:11,736 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 10 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 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 17:37:11,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:11,915 INFO L93 Difference]: Finished difference Result 49 states and 55 transitions. [2021-05-02 17:37:11,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 17:37:11,915 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 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 19 [2021-05-02 17:37:11,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:11,917 INFO L225 Difference]: With dead ends: 49 [2021-05-02 17:37:11,918 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 17:37:11,919 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 149.2ms TimeCoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2021-05-02 17:37:11,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 17:37:11,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 34. [2021-05-02 17:37:11,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 30 states have internal predecessors, (35), 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 17:37:11,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2021-05-02 17:37:11,931 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 19 [2021-05-02 17:37:11,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:11,931 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2021-05-02 17:37:11,932 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 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 17:37:11,932 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2021-05-02 17:37:11,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 17:37:11,932 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:11,933 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:12,154 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:12,154 INFO L428 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:12,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:12,155 INFO L82 PathProgramCache]: Analyzing trace with hash -31040983, now seen corresponding path program 3 times [2021-05-02 17:37:12,155 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:12,155 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1091564368] [2021-05-02 17:37:12,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:12,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:12,281 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:12,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:12,287 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 30 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 17:37:12,287 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:12,287 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1091564368] [2021-05-02 17:37:12,287 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1091564368] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:12,287 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [383211925] [2021-05-02 17:37:12,287 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 17:37:12,631 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 17:37:12,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:37:12,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 17:37:12,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:12,702 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:12,713 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 32 proven. 10 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 17:37:12,713 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [383211925] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:12,713 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:12,713 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2021-05-02 17:37:12,713 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229682724] [2021-05-02 17:37:12,714 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:37:12,714 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:12,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:37:12,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:37:12,714 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 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 17:37:12,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:12,850 INFO L93 Difference]: Finished difference Result 41 states and 45 transitions. [2021-05-02 17:37:12,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 17:37:12,851 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 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 33 [2021-05-02 17:37:12,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:12,851 INFO L225 Difference]: With dead ends: 41 [2021-05-02 17:37:12,851 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 17:37:12,852 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 30 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 138.3ms TimeCoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2021-05-02 17:37:12,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 17:37:12,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2021-05-02 17:37:12,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 34 states have internal predecessors, (39), 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 17:37:12,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2021-05-02 17:37:12,854 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 33 [2021-05-02 17:37:12,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:12,854 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2021-05-02 17:37:12,855 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 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 17:37:12,855 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2021-05-02 17:37:12,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 17:37:12,855 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:12,855 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:13,059 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:13,060 INFO L428 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:13,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:13,060 INFO L82 PathProgramCache]: Analyzing trace with hash -1913310235, now seen corresponding path program 4 times [2021-05-02 17:37:13,060 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:13,060 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [911094167] [2021-05-02 17:37:13,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:13,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:13,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:13,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:13,148 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 46 proven. 16 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-05-02 17:37:13,148 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:13,149 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [911094167] [2021-05-02 17:37:13,149 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [911094167] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:13,149 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2005669560] [2021-05-02 17:37:13,149 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 17:37:13,193 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:37:13,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:37:13,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 17:37:13,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:13,283 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 17:37:13,283 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2005669560] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:13,284 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:13,284 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2021-05-02 17:37:13,284 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960475163] [2021-05-02 17:37:13,284 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 17:37:13,284 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:13,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 17:37:13,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-02 17:37:13,285 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand has 14 states, 14 states have (on average 3.5) internal successors, (49), 13 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 17:37:13,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:13,667 INFO L93 Difference]: Finished difference Result 78 states and 86 transitions. [2021-05-02 17:37:13,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 17:37:13,667 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.5) internal successors, (49), 13 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 37 [2021-05-02 17:37:13,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:13,668 INFO L225 Difference]: With dead ends: 78 [2021-05-02 17:37:13,668 INFO L226 Difference]: Without dead ends: 78 [2021-05-02 17:37:13,668 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 246.5ms TimeCoverageRelationStatistics Valid=120, Invalid=636, Unknown=0, NotChecked=0, Total=756 [2021-05-02 17:37:13,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-02 17:37:13,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 58. [2021-05-02 17:37:13,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 54 states have (on average 1.1296296296296295) internal successors, (61), 54 states have internal predecessors, (61), 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 17:37:13,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 64 transitions. [2021-05-02 17:37:13,671 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 64 transitions. Word has length 37 [2021-05-02 17:37:13,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:13,672 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 64 transitions. [2021-05-02 17:37:13,672 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.5) internal successors, (49), 13 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 17:37:13,672 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 64 transitions. [2021-05-02 17:37:13,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 17:37:13,673 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:13,673 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:13,889 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:13,889 INFO L428 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:13,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:13,890 INFO L82 PathProgramCache]: Analyzing trace with hash 2051932331, now seen corresponding path program 5 times [2021-05-02 17:37:13,890 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:13,890 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1295873634] [2021-05-02 17:37:13,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:13,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:13,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:13,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:13,988 INFO L134 CoverageAnalysis]: Checked inductivity of 285 backedges. 130 proven. 25 refuted. 0 times theorem prover too weak. 130 trivial. 0 not checked. [2021-05-02 17:37:13,988 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:13,988 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1295873634] [2021-05-02 17:37:13,988 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1295873634] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:13,988 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1964710608] [2021-05-02 17:37:13,988 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 17:37:14,080 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 17:37:14,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:37:14,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 17:37:14,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:14,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:14,164 INFO L134 CoverageAnalysis]: Checked inductivity of 285 backedges. 200 proven. 25 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-05-02 17:37:14,164 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1964710608] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:14,164 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:14,164 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 17:37:14,164 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123913125] [2021-05-02 17:37:14,165 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 17:37:14,165 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:14,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 17:37:14,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:37:14,165 INFO L87 Difference]: Start difference. First operand 58 states and 64 transitions. Second operand has 10 states, 10 states have (on average 3.7) internal successors, (37), 9 states have internal predecessors, (37), 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 17:37:14,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:14,280 INFO L93 Difference]: Finished difference Result 68 states and 74 transitions. [2021-05-02 17:37:14,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 17:37:14,280 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.7) internal successors, (37), 9 states have internal predecessors, (37), 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 57 [2021-05-02 17:37:14,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:14,281 INFO L225 Difference]: With dead ends: 68 [2021-05-02 17:37:14,281 INFO L226 Difference]: Without dead ends: 68 [2021-05-02 17:37:14,281 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 98.7ms TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:37:14,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-02 17:37:14,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 64. [2021-05-02 17:37:14,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 60 states have (on average 1.1166666666666667) internal successors, (67), 60 states have internal predecessors, (67), 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 17:37:14,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 70 transitions. [2021-05-02 17:37:14,284 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 70 transitions. Word has length 57 [2021-05-02 17:37:14,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:14,284 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 70 transitions. [2021-05-02 17:37:14,284 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.7) internal successors, (37), 9 states have internal predecessors, (37), 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 17:37:14,285 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 70 transitions. [2021-05-02 17:37:14,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 17:37:14,285 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:14,285 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:14,489 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:14,489 INFO L428 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:14,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:14,490 INFO L82 PathProgramCache]: Analyzing trace with hash 1690684485, now seen corresponding path program 6 times [2021-05-02 17:37:14,490 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:14,490 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [214506629] [2021-05-02 17:37:14,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:14,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:14,608 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:14,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:14,612 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 178 proven. 36 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2021-05-02 17:37:14,612 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:14,612 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [214506629] [2021-05-02 17:37:14,612 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [214506629] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:14,612 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1458908600] [2021-05-02 17:37:14,613 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 17:37:15,181 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 14 check-sat command(s) [2021-05-02 17:37:15,181 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:37:15,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 17:37:15,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:15,261 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 183 proven. 1 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2021-05-02 17:37:15,262 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1458908600] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:15,262 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:15,262 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 4] total 12 [2021-05-02 17:37:15,262 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456907688] [2021-05-02 17:37:15,262 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 17:37:15,262 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:15,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 17:37:15,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2021-05-02 17:37:15,263 INFO L87 Difference]: Start difference. First operand 64 states and 70 transitions. Second operand has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 1 states have call successors, (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 17:37:15,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:15,597 INFO L93 Difference]: Finished difference Result 178 states and 190 transitions. [2021-05-02 17:37:15,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 17:37:15,597 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 1 states have call successors, (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 63 [2021-05-02 17:37:15,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:15,598 INFO L225 Difference]: With dead ends: 178 [2021-05-02 17:37:15,598 INFO L226 Difference]: Without dead ends: 178 [2021-05-02 17:37:15,598 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 236.5ms TimeCoverageRelationStatistics Valid=120, Invalid=636, Unknown=0, NotChecked=0, Total=756 [2021-05-02 17:37:15,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2021-05-02 17:37:15,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 121. [2021-05-02 17:37:15,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 117 states have (on average 1.0854700854700854) internal successors, (127), 117 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 17:37:15,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 130 transitions. [2021-05-02 17:37:15,603 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 130 transitions. Word has length 63 [2021-05-02 17:37:15,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:15,603 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 130 transitions. [2021-05-02 17:37:15,604 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 1 states have call successors, (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 17:37:15,604 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 130 transitions. [2021-05-02 17:37:15,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-05-02 17:37:15,604 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:15,605 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 6, 6, 6, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:15,814 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:15,815 INFO L428 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:15,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:15,815 INFO L82 PathProgramCache]: Analyzing trace with hash 981874007, now seen corresponding path program 7 times [2021-05-02 17:37:15,815 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:15,815 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1508277800] [2021-05-02 17:37:15,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:15,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:15,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:15,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:16,001 INFO L134 CoverageAnalysis]: Checked inductivity of 2049 backedges. 576 proven. 49 refuted. 0 times theorem prover too weak. 1424 trivial. 0 not checked. [2021-05-02 17:37:16,001 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:16,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1508277800] [2021-05-02 17:37:16,001 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1508277800] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:16,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1107637676] [2021-05-02 17:37:16,001 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 17:37:16,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:16,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 17:37:16,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:16,252 INFO L134 CoverageAnalysis]: Checked inductivity of 2049 backedges. 933 proven. 146 refuted. 0 times theorem prover too weak. 970 trivial. 0 not checked. [2021-05-02 17:37:16,252 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1107637676] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:16,252 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:16,252 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 17 [2021-05-02 17:37:16,253 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [696828377] [2021-05-02 17:37:16,254 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 17:37:16,254 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:16,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 17:37:16,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2021-05-02 17:37:16,255 INFO L87 Difference]: Start difference. First operand 121 states and 130 transitions. Second operand has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 16 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 17:37:16,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:16,847 INFO L93 Difference]: Finished difference Result 256 states and 271 transitions. [2021-05-02 17:37:16,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 17:37:16,847 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 16 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 120 [2021-05-02 17:37:16,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:16,848 INFO L225 Difference]: With dead ends: 256 [2021-05-02 17:37:16,848 INFO L226 Difference]: Without dead ends: 256 [2021-05-02 17:37:16,849 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 340 ImplicationChecksByTransitivity, 356.4ms TimeCoverageRelationStatistics Valid=183, Invalid=1377, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 17:37:16,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2021-05-02 17:37:16,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 190. [2021-05-02 17:37:16,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 186 states have (on average 1.0698924731182795) internal successors, (199), 186 states have internal predecessors, (199), 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 17:37:16,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 202 transitions. [2021-05-02 17:37:16,855 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 202 transitions. Word has length 120 [2021-05-02 17:37:16,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:16,855 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 202 transitions. [2021-05-02 17:37:16,855 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 16 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 17:37:16,855 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 202 transitions. [2021-05-02 17:37:16,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2021-05-02 17:37:16,857 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:16,857 INFO L523 BasicCegarLoop]: trace histogram [72, 72, 9, 9, 9, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:17,067 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 17:37:17,069 INFO L428 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:17,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:17,070 INFO L82 PathProgramCache]: Analyzing trace with hash 249845433, now seen corresponding path program 8 times [2021-05-02 17:37:17,070 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:17,070 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [698800811] [2021-05-02 17:37:17,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:17,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:17,370 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:17,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:17,375 INFO L134 CoverageAnalysis]: Checked inductivity of 5907 backedges. 1174 proven. 64 refuted. 0 times theorem prover too weak. 4669 trivial. 0 not checked. [2021-05-02 17:37:17,376 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:17,376 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [698800811] [2021-05-02 17:37:17,376 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [698800811] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:17,376 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1213153667] [2021-05-02 17:37:17,376 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