/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/sumt4.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 13:19:37,116 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 13:19:37,118 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 13:19:37,165 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 13:19:37,182 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 13:19:37,183 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 13:19:37,184 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 13:19:37,185 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 13:19:37,187 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 13:19:37,188 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 13:19:37,190 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 13:19:37,203 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 13:19:37,204 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 13:19:37,205 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 13:19:37,206 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 13:19:37,207 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 13:19:37,212 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 13:19:37,218 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 13:19:37,218 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 13:19:37,219 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 13:19:37,220 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 13:19:37,248 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 13:19:37,248 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 13:19:37,250 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 13:19:37,250 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 13:19:37,250 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 13:19:37,250 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 13:19:37,251 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 13:19:37,251 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 13:19:37,251 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 13:19:37,251 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 13:19:37,252 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 13:19:37,252 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 13:19:37,252 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 13:19:37,252 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 13:19:37,252 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 13:19:37,252 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 13:19:37,252 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 13:19:37,252 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 13:19:37,252 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 13:19:37,253 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 13:19:37,253 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:19:37,253 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 13:19:37,253 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 13:19:37,253 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 13:19:37,253 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 13:19:37,253 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 13:19:37,253 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 13:19:37,253 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 13:19:37,254 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 13:19:37,524 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 13:19:37,537 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 13:19:37,539 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 13:19:37,539 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 13:19:37,540 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 13:19:37,540 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/sumt4.c [2021-05-02 13:19:37,717 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1c357faa3/84929861108345d6bf1df9ef29980d39/FLAG517c8708c [2021-05-02 13:19:38,060 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 13:19:38,060 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/sumt4.c [2021-05-02 13:19:38,064 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1c357faa3/84929861108345d6bf1df9ef29980d39/FLAG517c8708c [2021-05-02 13:19:38,495 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1c357faa3/84929861108345d6bf1df9ef29980d39 [2021-05-02 13:19:38,497 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 13:19:38,498 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 13:19:38,500 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 13:19:38,501 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 13:19:38,503 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 13:19:38,504 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:19:38" (1/1) ... [2021-05-02 13:19:38,505 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@34f6358f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:19:38, skipping insertion in model container [2021-05-02 13:19:38,505 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:19:38" (1/1) ... [2021-05-02 13:19:38,509 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 13:19:38,519 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 13:19:38,603 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/sumt4.c[403,416] [2021-05-02 13:19:38,610 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:19:38,619 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 13:19:38,659 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/sumt4.c[403,416] [2021-05-02 13:19:38,672 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:19:38,683 INFO L208 MainTranslator]: Completed translation [2021-05-02 13:19:38,684 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:19:38 WrapperNode [2021-05-02 13:19:38,684 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 13:19:38,685 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 13:19:38,686 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 13:19:38,687 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 13:19:38,694 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:19:38" (1/1) ... [2021-05-02 13:19:38,694 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:19:38" (1/1) ... [2021-05-02 13:19:38,699 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:19:38" (1/1) ... [2021-05-02 13:19:38,699 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:19:38" (1/1) ... [2021-05-02 13:19:38,703 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:19:38" (1/1) ... [2021-05-02 13:19:38,705 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:19:38" (1/1) ... [2021-05-02 13:19:38,706 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:19:38" (1/1) ... [2021-05-02 13:19:38,707 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 13:19:38,708 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 13:19:38,708 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 13:19:38,708 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 13:19:38,713 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:19:38" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:19:38,772 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 13:19:38,773 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 13:19:38,773 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 13:19:38,773 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 13:19:38,773 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 13:19:38,773 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 13:19:38,773 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 13:19:38,773 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 13:19:38,773 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 13:19:38,773 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 13:19:38,773 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 13:19:38,774 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 13:19:38,774 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-05-02 13:19:38,774 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 13:19:38,774 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 13:19:38,774 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 13:19:38,774 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 13:19:38,774 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 13:19:38,774 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 13:19:38,774 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 13:19:38,907 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 13:19:38,908 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 13:19:38,908 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:19:38 BoogieIcfgContainer [2021-05-02 13:19:38,908 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 13:19:38,909 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 13:19:38,909 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 13:19:38,911 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 13:19:38,911 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 01:19:38" (1/3) ... [2021-05-02 13:19:38,912 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2254550a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:19:38, skipping insertion in model container [2021-05-02 13:19:38,912 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:19:38" (2/3) ... [2021-05-02 13:19:38,912 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2254550a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:19:38, skipping insertion in model container [2021-05-02 13:19:38,912 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:19:38" (3/3) ... [2021-05-02 13:19:38,913 INFO L111 eAbstractionObserver]: Analyzing ICFG sumt4.c [2021-05-02 13:19:38,916 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 13:19:38,918 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 13:19:38,929 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 13:19:38,942 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 13:19:38,942 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 13:19:38,942 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 13:19:38,942 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 13:19:38,942 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 13:19:38,943 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 13:19:38,943 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 13:19:38,943 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 13:19:38,968 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 16 states have (on average 1.5) internal successors, (24), 17 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:19:38,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 13:19:38,971 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:19:38,972 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:19:38,972 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:19:38,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:19:38,975 INFO L82 PathProgramCache]: Analyzing trace with hash -1709511738, now seen corresponding path program 1 times [2021-05-02 13:19:38,997 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:19:38,997 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1570721218] [2021-05-02 13:19:38,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:19:39,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:39,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:19:39,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:39,343 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:19:39,343 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:19:39,344 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1570721218] [2021-05-02 13:19:39,344 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1570721218] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:19:39,344 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:19:39,344 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 13:19:39,345 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923359654] [2021-05-02 13:19:39,347 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:19:39,347 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:19:39,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:19:39,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:19:39,356 INFO L87 Difference]: Start difference. First operand has 24 states, 16 states have (on average 1.5) internal successors, (24), 17 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:39,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:19:39,600 INFO L93 Difference]: Finished difference Result 51 states and 68 transitions. [2021-05-02 13:19:39,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:19:39,601 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 13:19:39,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:19:39,606 INFO L225 Difference]: With dead ends: 51 [2021-05-02 13:19:39,606 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 13:19:39,608 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 160.0ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:19:39,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 13:19:39,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-02 13:19:39,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:39,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2021-05-02 13:19:39,632 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 12 [2021-05-02 13:19:39,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:19:39,632 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2021-05-02 13:19:39,632 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:39,632 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2021-05-02 13:19:39,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 13:19:39,633 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:19:39,633 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:19:39,633 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 13:19:39,633 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:19:39,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:19:39,634 INFO L82 PathProgramCache]: Analyzing trace with hash 1996045709, now seen corresponding path program 1 times [2021-05-02 13:19:39,634 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:19:39,634 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2071933543] [2021-05-02 13:19:39,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:19:39,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:39,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:19:39,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:39,911 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:19:39,911 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:19:39,911 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2071933543] [2021-05-02 13:19:39,911 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2071933543] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:39,911 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1184771214] [2021-05-02 13:19:39,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:19:39,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:39,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 13:19:39,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:19:40,073 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:19:40,073 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1184771214] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:40,073 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:19:40,073 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 14 [2021-05-02 13:19:40,074 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386188325] [2021-05-02 13:19:40,074 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 13:19:40,074 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:19:40,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 13:19:40,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:19:40,075 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 11 states have internal predecessors, (18), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:40,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:19:40,366 INFO L93 Difference]: Finished difference Result 37 states and 47 transitions. [2021-05-02 13:19:40,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:19:40,367 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 11 states have internal predecessors, (18), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 13:19:40,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:19:40,367 INFO L225 Difference]: With dead ends: 37 [2021-05-02 13:19:40,367 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 13:19:40,368 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 381.9ms TimeCoverageRelationStatistics Valid=74, Invalid=306, Unknown=0, NotChecked=0, Total=380 [2021-05-02 13:19:40,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 13:19:40,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-02 13:19:40,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:40,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-05-02 13:19:40,372 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 15 [2021-05-02 13:19:40,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:19:40,372 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-05-02 13:19:40,372 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 11 states have internal predecessors, (18), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:40,372 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-05-02 13:19:40,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 13:19:40,373 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:19:40,373 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:19:40,586 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 13:19:40,589 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:19:40,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:19:40,589 INFO L82 PathProgramCache]: Analyzing trace with hash 1398447181, now seen corresponding path program 1 times [2021-05-02 13:19:40,590 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:19:40,590 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1607509877] [2021-05-02 13:19:40,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:19:40,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:40,856 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:19:40,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:40,873 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:19:40,874 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:19:40,874 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1607509877] [2021-05-02 13:19:40,874 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1607509877] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:40,874 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [784980130] [2021-05-02 13:19:40,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:19:40,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:40,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 13:19:40,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:19:41,067 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:19:41,067 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [784980130] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:41,067 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:19:41,067 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9] total 18 [2021-05-02 13:19:41,067 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072003196] [2021-05-02 13:19:41,068 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 13:19:41,068 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:19:41,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 13:19:41,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:19:41,069 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 18 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 15 states have internal predecessors, (28), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:41,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:19:41,523 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2021-05-02 13:19:41,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 13:19:41,523 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 15 states have internal predecessors, (28), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-02 13:19:41,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:19:41,525 INFO L225 Difference]: With dead ends: 42 [2021-05-02 13:19:41,525 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 13:19:41,526 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 565.0ms TimeCoverageRelationStatistics Valid=102, Invalid=548, Unknown=0, NotChecked=0, Total=650 [2021-05-02 13:19:41,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 13:19:41,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-05-02 13:19:41,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.1666666666666667) internal successors, (28), 24 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:41,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2021-05-02 13:19:41,534 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 20 [2021-05-02 13:19:41,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:19:41,534 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2021-05-02 13:19:41,535 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 15 states have internal predecessors, (28), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:41,535 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2021-05-02 13:19:41,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 13:19:41,535 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:19:41,535 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:19:41,748 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:19:41,749 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:19:41,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:19:41,750 INFO L82 PathProgramCache]: Analyzing trace with hash 1358561035, now seen corresponding path program 1 times [2021-05-02 13:19:41,750 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:19:41,750 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1367675157] [2021-05-02 13:19:41,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:19:41,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:42,026 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:19:42,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:42,033 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:19:42,033 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:19:42,033 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1367675157] [2021-05-02 13:19:42,033 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1367675157] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:42,033 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1102632529] [2021-05-02 13:19:42,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:19:42,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:42,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 13:19:42,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:19:42,221 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:19:42,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:19:42,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:19:42,269 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:19:42,269 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1102632529] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:42,269 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:19:42,269 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 19 [2021-05-02 13:19:42,270 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290326709] [2021-05-02 13:19:42,270 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 13:19:42,270 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:19:42,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 13:19:42,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:19:42,271 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 16 states have internal predecessors, (36), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:42,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:19:42,705 INFO L93 Difference]: Finished difference Result 46 states and 55 transitions. [2021-05-02 13:19:42,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 13:19:42,706 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 16 states have internal predecessors, (36), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-05-02 13:19:42,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:19:42,706 INFO L225 Difference]: With dead ends: 46 [2021-05-02 13:19:42,707 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 13:19:42,707 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 492.1ms TimeCoverageRelationStatistics Valid=110, Invalid=646, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:19:42,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 13:19:42,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-05-02 13:19:42,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 28 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:42,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 36 transitions. [2021-05-02 13:19:42,711 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 36 transitions. Word has length 25 [2021-05-02 13:19:42,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:19:42,711 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 36 transitions. [2021-05-02 13:19:42,711 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 16 states have internal predecessors, (36), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:42,711 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 36 transitions. [2021-05-02 13:19:42,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 13:19:42,712 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:19:42,712 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:19:42,927 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:19:42,927 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:19:42,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:19:42,927 INFO L82 PathProgramCache]: Analyzing trace with hash -1193029955, now seen corresponding path program 1 times [2021-05-02 13:19:42,927 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:19:42,928 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2041590942] [2021-05-02 13:19:42,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:19:42,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:43,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:19:43,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:43,340 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:19:43,340 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:19:43,340 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2041590942] [2021-05-02 13:19:43,340 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2041590942] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:43,340 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [20677908] [2021-05-02 13:19:43,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:19:43,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:43,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-02 13:19:43,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:19:43,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:19:43,635 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:19:43,638 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:19:43,642 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:19:43,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:19:43,702 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:19:43,703 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [20677908] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:43,703 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:19:43,703 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 24 [2021-05-02 13:19:43,703 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237762877] [2021-05-02 13:19:43,703 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 13:19:43,703 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:19:43,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 13:19:43,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=484, Unknown=0, NotChecked=0, Total=552 [2021-05-02 13:19:43,708 INFO L87 Difference]: Start difference. First operand 33 states and 36 transitions. Second operand has 24 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 21 states have internal predecessors, (40), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:44,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:19:44,470 INFO L93 Difference]: Finished difference Result 49 states and 57 transitions. [2021-05-02 13:19:44,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 13:19:44,471 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 21 states have internal predecessors, (40), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 13:19:44,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:19:44,471 INFO L225 Difference]: With dead ends: 49 [2021-05-02 13:19:44,471 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 13:19:44,472 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 205 ImplicationChecksByTransitivity, 960.6ms TimeCoverageRelationStatistics Valid=141, Invalid=1119, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 13:19:44,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 13:19:44,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-02 13:19:44,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.1290322580645162) internal successors, (35), 31 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:44,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2021-05-02 13:19:44,477 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 29 [2021-05-02 13:19:44,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:19:44,477 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2021-05-02 13:19:44,477 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 21 states have internal predecessors, (40), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:44,477 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2021-05-02 13:19:44,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 13:19:44,478 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:19:44,478 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:19:44,681 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:19:44,681 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:19:44,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:19:44,681 INFO L82 PathProgramCache]: Analyzing trace with hash -362978506, now seen corresponding path program 2 times [2021-05-02 13:19:44,682 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:19:44,682 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1324862042] [2021-05-02 13:19:44,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:19:44,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:45,148 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:19:45,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:45,160 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:19:45,160 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:19:45,160 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1324862042] [2021-05-02 13:19:45,160 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1324862042] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:45,161 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [507439600] [2021-05-02 13:19:45,161 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 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:19:45,228 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:19:45,229 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:19:45,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-02 13:19:45,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:19:45,588 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:19:45,642 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:19:45,642 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [507439600] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:45,642 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:19:45,642 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15] total 30 [2021-05-02 13:19:45,642 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [209901786] [2021-05-02 13:19:45,643 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 13:19:45,643 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:19:45,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 13:19:45,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2021-05-02 13:19:45,644 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand has 30 states, 29 states have (on average 1.793103448275862) internal successors, (52), 27 states have internal predecessors, (52), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:46,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:19:46,976 INFO L93 Difference]: Finished difference Result 60 states and 74 transitions. [2021-05-02 13:19:46,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 13:19:46,977 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 1.793103448275862) internal successors, (52), 27 states have internal predecessors, (52), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 13:19:46,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:19:46,978 INFO L225 Difference]: With dead ends: 60 [2021-05-02 13:19:46,978 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 13:19:46,979 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 329 ImplicationChecksByTransitivity, 1652.1ms TimeCoverageRelationStatistics Valid=196, Invalid=1966, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 13:19:46,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 13:19:46,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2021-05-02 13:19:46,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.105263157894737) internal successors, (42), 38 states have internal predecessors, (42), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:46,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2021-05-02 13:19:46,983 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 32 [2021-05-02 13:19:46,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:19:46,983 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2021-05-02 13:19:46,983 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 29 states have (on average 1.793103448275862) internal successors, (52), 27 states have internal predecessors, (52), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:46,983 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2021-05-02 13:19:46,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 13:19:46,983 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:19:46,984 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:19:47,184 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:19:47,184 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:19:47,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:19:47,185 INFO L82 PathProgramCache]: Analyzing trace with hash -1506453425, now seen corresponding path program 3 times [2021-05-02 13:19:47,185 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:19:47,185 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [823170613] [2021-05-02 13:19:47,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:19:47,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:47,287 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:19:47,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:47,292 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 13 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:19:47,293 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:19:47,293 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [823170613] [2021-05-02 13:19:47,293 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [823170613] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:47,293 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [566388996] [2021-05-02 13:19:47,293 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 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:19:47,414 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 13:19:47,414 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:19:47,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 13:19:47,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:19:47,567 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:19:47,586 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 46 proven. 3 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-05-02 13:19:47,586 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [566388996] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:47,586 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:19:47,586 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6] total 14 [2021-05-02 13:19:47,586 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482812582] [2021-05-02 13:19:47,586 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 13:19:47,587 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:19:47,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 13:19:47,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:19:47,587 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand has 14 states, 14 states have (on average 4.0) internal successors, (56), 13 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:48,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:19:48,235 INFO L93 Difference]: Finished difference Result 76 states and 96 transitions. [2021-05-02 13:19:48,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 13:19:48,235 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.0) internal successors, (56), 13 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2021-05-02 13:19:48,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:19:48,237 INFO L225 Difference]: With dead ends: 76 [2021-05-02 13:19:48,237 INFO L226 Difference]: Without dead ends: 66 [2021-05-02 13:19:48,237 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 498.3ms TimeCoverageRelationStatistics Valid=100, Invalid=550, Unknown=0, NotChecked=0, Total=650 [2021-05-02 13:19:48,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-02 13:19:48,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 60. [2021-05-02 13:19:48,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 55 states have (on average 1.2) internal successors, (66), 55 states have internal predecessors, (66), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:48,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 70 transitions. [2021-05-02 13:19:48,243 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 70 transitions. Word has length 40 [2021-05-02 13:19:48,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:19:48,244 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 70 transitions. [2021-05-02 13:19:48,244 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 4.0) internal successors, (56), 13 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:48,244 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 70 transitions. [2021-05-02 13:19:48,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 13:19:48,244 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:19:48,244 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:19:48,448 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:19:48,448 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:19:48,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:19:48,448 INFO L82 PathProgramCache]: Analyzing trace with hash 843129718, now seen corresponding path program 4 times [2021-05-02 13:19:48,449 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:19:48,449 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [589530107] [2021-05-02 13:19:48,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:19:48,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:49,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:19:49,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:49,108 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:19:49,108 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:19:49,108 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [589530107] [2021-05-02 13:19:49,108 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [589530107] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:49,108 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1079973409] [2021-05-02 13:19:49,108 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:19:49,218 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:19:49,218 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:19:49,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-02 13:19:49,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:19:49,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:19:49,687 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:19:49,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:19:49,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:19:49,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:19:49,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:19:49,753 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:19:49,753 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1079973409] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:49,753 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:19:49,753 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 19] total 36 [2021-05-02 13:19:49,753 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122845028] [2021-05-02 13:19:49,753 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 13:19:49,754 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:19:49,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 13:19:49,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1149, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 13:19:49,754 INFO L87 Difference]: Start difference. First operand 60 states and 70 transitions. Second operand has 36 states, 35 states have (on average 1.8285714285714285) internal successors, (64), 33 states have internal predecessors, (64), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:51,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:19:51,145 INFO L93 Difference]: Finished difference Result 94 states and 118 transitions. [2021-05-02 13:19:51,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 13:19:51,145 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 1.8285714285714285) internal successors, (64), 33 states have internal predecessors, (64), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-02 13:19:51,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:19:51,146 INFO L225 Difference]: With dead ends: 94 [2021-05-02 13:19:51,146 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 13:19:51,147 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 591 ImplicationChecksByTransitivity, 1826.9ms TimeCoverageRelationStatistics Valid=241, Invalid=2839, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 13:19:51,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 13:19:51,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2021-05-02 13:19:51,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 57 states have (on average 1.1403508771929824) internal successors, (65), 57 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:51,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 69 transitions. [2021-05-02 13:19:51,151 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 69 transitions. Word has length 41 [2021-05-02 13:19:51,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:19:51,151 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 69 transitions. [2021-05-02 13:19:51,152 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 35 states have (on average 1.8285714285714285) internal successors, (64), 33 states have internal predecessors, (64), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:51,152 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 69 transitions. [2021-05-02 13:19:51,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 13:19:51,152 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:19:51,154 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 6, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:19:51,357 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:19:51,357 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:19:51,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:19:51,357 INFO L82 PathProgramCache]: Analyzing trace with hash -1082861425, now seen corresponding path program 5 times [2021-05-02 13:19:51,358 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:19:51,358 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [10749285] [2021-05-02 13:19:51,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:19:51,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:52,121 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:19:52,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:52,125 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 0 proven. 138 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:19:52,125 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:19:52,125 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [10749285] [2021-05-02 13:19:52,125 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [10749285] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:52,125 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [984361078] [2021-05-02 13:19:52,125 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 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