/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_o10.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-23 18:16:59,794 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 18:16:59,797 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 18:16:59,848 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-23 18:16:59,849 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-23 18:16:59,854 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-23 18:16:59,857 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-23 18:16:59,862 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-23 18:16:59,866 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-23 18:16:59,871 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-23 18:16:59,873 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-23 18:16:59,874 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-23 18:16:59,875 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-23 18:16:59,877 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-23 18:16:59,880 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-23 18:16:59,881 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-23 18:16:59,882 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-23 18:16:59,884 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-23 18:16:59,891 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-23 18:16:59,902 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-23 18:16:59,904 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-23 18:16:59,905 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-23 18:16:59,906 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-23 18:16:59,907 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-23 18:16:59,909 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-10-23 18:16:59,918 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-23 18:16:59,919 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-23 18:16:59,920 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-23 18:16:59,921 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 [2020-10-23 18:16:59,950 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 18:16:59,950 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 18:16:59,952 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-23 18:16:59,952 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-23 18:16:59,952 INFO L138 SettingsManager]: * Use SBE=true [2020-10-23 18:16:59,952 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 18:16:59,953 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 18:16:59,953 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 18:16:59,953 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 18:16:59,953 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 18:16:59,953 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 18:16:59,954 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 18:16:59,954 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 18:16:59,954 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 18:16:59,954 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 18:16:59,954 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 18:16:59,955 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 18:16:59,955 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 18:16:59,955 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-23 18:16:59,955 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 18:16:59,955 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 18:16:59,956 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 18:16:59,956 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 18:16:59,956 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-23 18:16:59,956 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-23 18:16:59,956 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-23 18:16:59,957 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-23 18:16:59,957 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 18:16:59,957 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-23 18:16:59,957 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 18:17:00,378 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 18:17:00,416 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 18:17:00,420 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 18:17:00,421 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 18:17:00,425 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 18:17:00,426 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o10.c [2020-10-23 18:17:00,516 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cd09a93e5/1a5acb06734646cb9503bea6a3ce9e38/FLAG8adfab4a4 [2020-10-23 18:17:01,228 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 18:17:01,228 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_o10.c [2020-10-23 18:17:01,235 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cd09a93e5/1a5acb06734646cb9503bea6a3ce9e38/FLAG8adfab4a4 [2020-10-23 18:17:01,593 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cd09a93e5/1a5acb06734646cb9503bea6a3ce9e38 [2020-10-23 18:17:01,598 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 18:17:01,607 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 18:17:01,611 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 18:17:01,611 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 18:17:01,615 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 18:17:01,616 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 06:17:01" (1/1) ... [2020-10-23 18:17:01,619 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@113598a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:17:01, skipping insertion in model container [2020-10-23 18:17:01,620 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 06:17:01" (1/1) ... [2020-10-23 18:17:01,629 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 18:17:01,642 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 18:17:01,792 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 18:17:01,804 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 18:17:01,821 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 18:17:01,839 INFO L208 MainTranslator]: Completed translation [2020-10-23 18:17:01,840 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:17:01 WrapperNode [2020-10-23 18:17:01,840 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 18:17:01,841 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 18:17:01,842 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 18:17:01,842 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 18:17:01,856 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:17:01" (1/1) ... [2020-10-23 18:17:01,856 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:17:01" (1/1) ... [2020-10-23 18:17:01,864 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:17:01" (1/1) ... [2020-10-23 18:17:01,865 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:17:01" (1/1) ... [2020-10-23 18:17:01,870 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:17:01" (1/1) ... [2020-10-23 18:17:01,872 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:17:01" (1/1) ... [2020-10-23 18:17:01,873 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:17:01" (1/1) ... [2020-10-23 18:17:01,875 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 18:17:01,877 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 18:17:01,877 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 18:17:01,877 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 18:17:01,878 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:17:01" (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 [2020-10-23 18:17:01,965 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 18:17:01,966 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 18:17:01,966 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 18:17:01,966 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-10-23 18:17:01,966 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 18:17:01,966 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-10-23 18:17:01,967 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 18:17:01,967 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 18:17:01,967 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 18:17:01,967 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 18:17:01,967 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-10-23 18:17:01,968 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 18:17:01,968 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 18:17:01,968 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 18:17:01,968 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 18:17:01,968 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 18:17:01,968 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 18:17:01,969 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 18:17:02,279 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 18:17:02,279 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-10-23 18:17:02,281 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 06:17:02 BoogieIcfgContainer [2020-10-23 18:17:02,281 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 18:17:02,286 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 18:17:02,286 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 18:17:02,290 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 18:17:02,291 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 06:17:01" (1/3) ... [2020-10-23 18:17:02,292 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d406a67 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 06:17:02, skipping insertion in model container [2020-10-23 18:17:02,293 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:17:01" (2/3) ... [2020-10-23 18:17:02,293 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d406a67 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 06:17:02, skipping insertion in model container [2020-10-23 18:17:02,294 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 06:17:02" (3/3) ... [2020-10-23 18:17:02,297 INFO L111 eAbstractionObserver]: Analyzing ICFG id_o10.c [2020-10-23 18:17:02,313 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-23 18:17:02,318 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 18:17:02,334 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 18:17:02,372 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 18:17:02,373 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 18:17:02,373 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-23 18:17:02,373 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 18:17:02,373 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 18:17:02,374 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 18:17:02,374 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 18:17:02,374 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 18:17:02,392 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-10-23 18:17:02,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-10-23 18:17:02,398 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:17:02,399 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:17:02,399 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:17:02,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:17:02,406 INFO L82 PathProgramCache]: Analyzing trace with hash 560135365, now seen corresponding path program 1 times [2020-10-23 18:17:02,417 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:17:02,417 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [985401539] [2020-10-23 18:17:02,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:17:02,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:02,825 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-10-23 18:17:02,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:17:02,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:02,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:17:02,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:02,943 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:17:02,944 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [985401539] [2020-10-23 18:17:02,945 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:17:02,945 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-23 18:17:02,946 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991165909] [2020-10-23 18:17:02,951 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 18:17:02,952 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:17:02,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 18:17:02,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-23 18:17:02,970 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 6 states. [2020-10-23 18:17:03,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:17:03,399 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2020-10-23 18:17:03,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-23 18:17:03,402 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-10-23 18:17:03,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:17:03,412 INFO L225 Difference]: With dead ends: 38 [2020-10-23 18:17:03,412 INFO L226 Difference]: Without dead ends: 20 [2020-10-23 18:17:03,416 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-10-23 18:17:03,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-10-23 18:17:03,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-10-23 18:17:03,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-10-23 18:17:03,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-10-23 18:17:03,464 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 15 [2020-10-23 18:17:03,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:17:03,464 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-10-23 18:17:03,465 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 18:17:03,465 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-10-23 18:17:03,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-10-23 18:17:03,467 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:17:03,467 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:17:03,468 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 18:17:03,468 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:17:03,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:17:03,469 INFO L82 PathProgramCache]: Analyzing trace with hash -1295611761, now seen corresponding path program 1 times [2020-10-23 18:17:03,469 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:17:03,470 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1827875040] [2020-10-23 18:17:03,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:17:03,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:03,631 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:17:03,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:03,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:17:03,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:03,713 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:03,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:03,764 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-23 18:17:03,764 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1827875040] [2020-10-23 18:17:03,765 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [373597330] [2020-10-23 18:17:03,765 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 [2020-10-23 18:17:03,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:03,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 11 conjunts are in the unsatisfiable core [2020-10-23 18:17:03,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:17:03,959 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-23 18:17:03,959 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:17:03,960 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2020-10-23 18:17:03,961 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [429356312] [2020-10-23 18:17:03,962 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-10-23 18:17:03,962 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:17:03,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-10-23 18:17:03,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-10-23 18:17:03,964 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 9 states. [2020-10-23 18:17:04,196 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-10-23 18:17:04,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:17:04,473 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-10-23 18:17:04,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-23 18:17:04,473 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 21 [2020-10-23 18:17:04,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:17:04,475 INFO L225 Difference]: With dead ends: 28 [2020-10-23 18:17:04,475 INFO L226 Difference]: Without dead ends: 23 [2020-10-23 18:17:04,477 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2020-10-23 18:17:04,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-10-23 18:17:04,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-10-23 18:17:04,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-10-23 18:17:04,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-10-23 18:17:04,486 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 21 [2020-10-23 18:17:04,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:17:04,487 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-10-23 18:17:04,487 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-10-23 18:17:04,487 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-10-23 18:17:04,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-10-23 18:17:04,488 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:17:04,488 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:17:04,703 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-10-23 18:17:04,704 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:17:04,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:17:04,707 INFO L82 PathProgramCache]: Analyzing trace with hash -116387003, now seen corresponding path program 2 times [2020-10-23 18:17:04,707 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:17:04,708 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1969461775] [2020-10-23 18:17:04,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:17:04,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:04,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:17:04,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:04,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:17:04,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:04,890 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:04,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:04,938 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:04,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:04,968 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-10-23 18:17:04,969 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1969461775] [2020-10-23 18:17:04,969 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2100817787] [2020-10-23 18:17:04,970 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 [2020-10-23 18:17:05,025 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-10-23 18:17:05,025 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 18:17:05,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 15 conjunts are in the unsatisfiable core [2020-10-23 18:17:05,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:17:05,091 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-10-23 18:17:05,091 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:17:05,092 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2020-10-23 18:17:05,092 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1160943689] [2020-10-23 18:17:05,093 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-10-23 18:17:05,093 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:17:05,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-10-23 18:17:05,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2020-10-23 18:17:05,094 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 11 states. [2020-10-23 18:17:05,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:17:05,595 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-10-23 18:17:05,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-23 18:17:05,595 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 27 [2020-10-23 18:17:05,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:17:05,597 INFO L225 Difference]: With dead ends: 31 [2020-10-23 18:17:05,597 INFO L226 Difference]: Without dead ends: 26 [2020-10-23 18:17:05,598 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-10-23 18:17:05,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-10-23 18:17:05,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-10-23 18:17:05,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-10-23 18:17:05,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2020-10-23 18:17:05,606 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 27 [2020-10-23 18:17:05,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:17:05,606 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2020-10-23 18:17:05,606 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-10-23 18:17:05,607 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2020-10-23 18:17:05,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-10-23 18:17:05,608 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:17:05,608 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:17:05,821 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:17:05,822 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:17:05,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:17:05,824 INFO L82 PathProgramCache]: Analyzing trace with hash -738125937, now seen corresponding path program 3 times [2020-10-23 18:17:05,824 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:17:05,825 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1531380311] [2020-10-23 18:17:05,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:17:05,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:05,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:17:05,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:05,993 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:17:06,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:06,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:06,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:06,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:06,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:06,176 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:06,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:06,207 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-10-23 18:17:06,208 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1531380311] [2020-10-23 18:17:06,208 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [932469898] [2020-10-23 18:17:06,208 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 [2020-10-23 18:17:06,265 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-10-23 18:17:06,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 18:17:06,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 19 conjunts are in the unsatisfiable core [2020-10-23 18:17:06,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:17:06,334 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-10-23 18:17:06,334 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:17:06,335 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2020-10-23 18:17:06,335 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813968816] [2020-10-23 18:17:06,336 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-10-23 18:17:06,336 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:17:06,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-10-23 18:17:06,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2020-10-23 18:17:06,337 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand 13 states. [2020-10-23 18:17:06,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:17:06,908 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-10-23 18:17:06,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-10-23 18:17:06,909 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-10-23 18:17:06,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:17:06,910 INFO L225 Difference]: With dead ends: 34 [2020-10-23 18:17:06,911 INFO L226 Difference]: Without dead ends: 29 [2020-10-23 18:17:06,912 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2020-10-23 18:17:06,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-10-23 18:17:06,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-10-23 18:17:06,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-10-23 18:17:06,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-10-23 18:17:06,920 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 33 [2020-10-23 18:17:06,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:17:06,920 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-10-23 18:17:06,920 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-10-23 18:17:06,920 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-10-23 18:17:06,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-10-23 18:17:06,922 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:17:06,922 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:17:07,137 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:17:07,139 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:17:07,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:17:07,140 INFO L82 PathProgramCache]: Analyzing trace with hash 1342585285, now seen corresponding path program 4 times [2020-10-23 18:17:07,141 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:17:07,141 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [795121815] [2020-10-23 18:17:07,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:17:07,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:07,257 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:17:07,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:07,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:17:07,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:07,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:07,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:07,379 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:07,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:07,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:07,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:07,499 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:07,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:07,543 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-10-23 18:17:07,544 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [795121815] [2020-10-23 18:17:07,544 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [615916228] [2020-10-23 18:17:07,544 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 [2020-10-23 18:17:07,614 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-10-23 18:17:07,615 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 18:17:07,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 23 conjunts are in the unsatisfiable core [2020-10-23 18:17:07,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:17:07,711 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-10-23 18:17:07,711 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:17:07,711 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2020-10-23 18:17:07,712 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949001272] [2020-10-23 18:17:07,712 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-10-23 18:17:07,712 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:17:07,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-10-23 18:17:07,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2020-10-23 18:17:07,713 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 15 states. [2020-10-23 18:17:08,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:17:08,368 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-10-23 18:17:08,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-10-23 18:17:08,369 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 39 [2020-10-23 18:17:08,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:17:08,371 INFO L225 Difference]: With dead ends: 37 [2020-10-23 18:17:08,371 INFO L226 Difference]: Without dead ends: 32 [2020-10-23 18:17:08,372 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=73, Invalid=577, Unknown=0, NotChecked=0, Total=650 [2020-10-23 18:17:08,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-10-23 18:17:08,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-10-23 18:17:08,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-10-23 18:17:08,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2020-10-23 18:17:08,380 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 39 [2020-10-23 18:17:08,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:17:08,380 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2020-10-23 18:17:08,380 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-10-23 18:17:08,380 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2020-10-23 18:17:08,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-10-23 18:17:08,382 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:17:08,382 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:17:08,597 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:17:08,598 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:17:08,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:17:08,599 INFO L82 PathProgramCache]: Analyzing trace with hash 1660180111, now seen corresponding path program 5 times [2020-10-23 18:17:08,599 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:17:08,599 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1223254529] [2020-10-23 18:17:08,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:17:08,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:08,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:17:08,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:08,740 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:17:08,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:08,804 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:08,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:08,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:08,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:08,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:08,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:08,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:08,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:09,040 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:09,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:09,089 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-10-23 18:17:09,090 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1223254529] [2020-10-23 18:17:09,091 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2082701608] [2020-10-23 18:17:09,091 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 [2020-10-23 18:17:09,207 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-10-23 18:17:09,207 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 18:17:09,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 27 conjunts are in the unsatisfiable core [2020-10-23 18:17:09,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:17:09,303 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-10-23 18:17:09,303 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:17:09,304 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2020-10-23 18:17:09,304 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1820497077] [2020-10-23 18:17:09,307 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-10-23 18:17:09,308 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:17:09,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-10-23 18:17:09,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2020-10-23 18:17:09,309 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand 17 states. [2020-10-23 18:17:10,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:17:10,249 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-10-23 18:17:10,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-10-23 18:17:10,250 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 45 [2020-10-23 18:17:10,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:17:10,251 INFO L225 Difference]: With dead ends: 40 [2020-10-23 18:17:10,251 INFO L226 Difference]: Without dead ends: 35 [2020-10-23 18:17:10,254 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=85, Invalid=785, Unknown=0, NotChecked=0, Total=870 [2020-10-23 18:17:10,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-10-23 18:17:10,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-10-23 18:17:10,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-10-23 18:17:10,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-10-23 18:17:10,263 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 45 [2020-10-23 18:17:10,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:17:10,264 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-10-23 18:17:10,264 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-10-23 18:17:10,264 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-10-23 18:17:10,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-10-23 18:17:10,266 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:17:10,266 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:17:10,471 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-10-23 18:17:10,472 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:17:10,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:17:10,474 INFO L82 PathProgramCache]: Analyzing trace with hash 1624338501, now seen corresponding path program 6 times [2020-10-23 18:17:10,474 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:17:10,475 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1575348829] [2020-10-23 18:17:10,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:17:10,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:10,580 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:17:10,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:10,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:17:10,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:10,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:10,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:10,673 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:10,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:10,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:10,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:10,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:10,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:10,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:10,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:10,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:10,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:10,938 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-10-23 18:17:10,953 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1575348829] [2020-10-23 18:17:10,954 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1973760009] [2020-10-23 18:17:10,954 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 [2020-10-23 18:17:11,022 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-10-23 18:17:11,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 18:17:11,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 31 conjunts are in the unsatisfiable core [2020-10-23 18:17:11,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:17:11,106 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-10-23 18:17:11,107 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:17:11,107 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2020-10-23 18:17:11,107 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [808825682] [2020-10-23 18:17:11,108 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-10-23 18:17:11,108 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:17:11,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-10-23 18:17:11,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2020-10-23 18:17:11,109 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 19 states. [2020-10-23 18:17:12,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:17:12,226 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-10-23 18:17:12,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-10-23 18:17:12,226 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 51 [2020-10-23 18:17:12,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:17:12,228 INFO L225 Difference]: With dead ends: 43 [2020-10-23 18:17:12,228 INFO L226 Difference]: Without dead ends: 38 [2020-10-23 18:17:12,231 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 65 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2020-10-23 18:17:12,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-10-23 18:17:12,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-10-23 18:17:12,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-10-23 18:17:12,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2020-10-23 18:17:12,244 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 51 [2020-10-23 18:17:12,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:17:12,246 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2020-10-23 18:17:12,246 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-10-23 18:17:12,246 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2020-10-23 18:17:12,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-10-23 18:17:12,249 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:17:12,249 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:17:12,463 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:17:12,464 INFO L429 AbstractCegarLoop]: === Iteration 8 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:17:12,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:17:12,466 INFO L82 PathProgramCache]: Analyzing trace with hash 502547855, now seen corresponding path program 7 times [2020-10-23 18:17:12,466 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:17:12,466 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [980379793] [2020-10-23 18:17:12,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:17:12,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:12,552 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:17:12,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:12,558 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:17:12,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:12,604 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:12,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:12,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:12,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:12,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:12,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:12,753 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:12,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:12,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:12,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:12,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:12,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:12,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:12,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:12,979 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-10-23 18:17:12,979 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [980379793] [2020-10-23 18:17:12,980 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1121432992] [2020-10-23 18:17:12,980 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 [2020-10-23 18:17:13,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:13,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 35 conjunts are in the unsatisfiable core [2020-10-23 18:17:13,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:17:13,138 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-10-23 18:17:13,138 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:17:13,139 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2020-10-23 18:17:13,139 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010963982] [2020-10-23 18:17:13,140 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-10-23 18:17:13,140 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:17:13,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-10-23 18:17:13,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2020-10-23 18:17:13,141 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand 21 states. [2020-10-23 18:17:14,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:17:14,475 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-10-23 18:17:14,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-10-23 18:17:14,476 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 57 [2020-10-23 18:17:14,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:17:14,478 INFO L225 Difference]: With dead ends: 46 [2020-10-23 18:17:14,478 INFO L226 Difference]: Without dead ends: 41 [2020-10-23 18:17:14,480 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=109, Invalid=1297, Unknown=0, NotChecked=0, Total=1406 [2020-10-23 18:17:14,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-10-23 18:17:14,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-10-23 18:17:14,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-10-23 18:17:14,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-10-23 18:17:14,487 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 57 [2020-10-23 18:17:14,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:17:14,487 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-10-23 18:17:14,487 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-10-23 18:17:14,488 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-10-23 18:17:14,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-10-23 18:17:14,490 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:17:14,490 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:17:14,694 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:17:14,695 INFO L429 AbstractCegarLoop]: === Iteration 9 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:17:14,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:17:14,696 INFO L82 PathProgramCache]: Analyzing trace with hash -1459767611, now seen corresponding path program 8 times [2020-10-23 18:17:14,696 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:17:14,697 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [642913972] [2020-10-23 18:17:14,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:17:14,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:14,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:17:14,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:14,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:17:14,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:14,852 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:14,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:14,910 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:14,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:14,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:14,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:15,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:15,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:15,113 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:15,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:15,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:15,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:15,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:15,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:15,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:15,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:15,387 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-10-23 18:17:15,388 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [642913972] [2020-10-23 18:17:15,389 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [112433559] [2020-10-23 18:17:15,389 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 [2020-10-23 18:17:15,452 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-10-23 18:17:15,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 18:17:15,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 39 conjunts are in the unsatisfiable core [2020-10-23 18:17:15,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:17:15,549 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-10-23 18:17:15,550 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:17:15,550 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2020-10-23 18:17:15,550 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638282699] [2020-10-23 18:17:15,551 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-10-23 18:17:15,551 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:17:15,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-10-23 18:17:15,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2020-10-23 18:17:15,552 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 23 states. [2020-10-23 18:17:17,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:17:17,048 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-10-23 18:17:17,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-10-23 18:17:17,048 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 63 [2020-10-23 18:17:17,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:17:17,050 INFO L225 Difference]: With dead ends: 49 [2020-10-23 18:17:17,050 INFO L226 Difference]: Without dead ends: 44 [2020-10-23 18:17:17,053 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=121, Invalid=1601, Unknown=0, NotChecked=0, Total=1722 [2020-10-23 18:17:17,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-10-23 18:17:17,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-10-23 18:17:17,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-10-23 18:17:17,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions. [2020-10-23 18:17:17,060 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 63 [2020-10-23 18:17:17,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:17:17,061 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 45 transitions. [2020-10-23 18:17:17,061 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-10-23 18:17:17,061 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions. [2020-10-23 18:17:17,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-10-23 18:17:17,062 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:17:17,062 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:17:17,276 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-10-23 18:17:17,277 INFO L429 AbstractCegarLoop]: === Iteration 10 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:17:17,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:17:17,278 INFO L82 PathProgramCache]: Analyzing trace with hash 273998991, now seen corresponding path program 9 times [2020-10-23 18:17:17,279 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:17:17,279 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1415737941] [2020-10-23 18:17:17,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:17:17,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:17,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:17:17,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:17,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:17:17,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:17,420 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:17,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:17,469 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:17,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:17,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:17,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:17,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:17,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:17,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:17,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:17,694 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:17,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:17,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:17,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:17,843 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:17,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:17,916 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:17:17,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:17:17,983 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-10-23 18:17:17,983 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1415737941] [2020-10-23 18:17:17,983 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1057356249] [2020-10-23 18:17:17,984 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:17:18,194 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2020-10-23 18:17:18,195 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 18:17:18,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 44 conjunts are in the unsatisfiable core [2020-10-23 18:17:18,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:17:18,312 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-10-23 18:17:18,312 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:17:18,312 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2020-10-23 18:17:18,313 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792763510] [2020-10-23 18:17:18,315 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-10-23 18:17:18,316 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:17:18,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-10-23 18:17:18,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=552, Unknown=0, NotChecked=0, Total=600 [2020-10-23 18:17:18,321 INFO L87 Difference]: Start difference. First operand 44 states and 45 transitions. Second operand 25 states. [2020-10-23 18:17:20,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:17:20,098 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2020-10-23 18:17:20,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-10-23 18:17:20,098 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 69 [2020-10-23 18:17:20,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:17:20,101 INFO L225 Difference]: With dead ends: 52 [2020-10-23 18:17:20,101 INFO L226 Difference]: Without dead ends: 47 [2020-10-23 18:17:20,103 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 89 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=133, Invalid=1937, Unknown=0, NotChecked=0, Total=2070 [2020-10-23 18:17:20,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-10-23 18:17:20,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-10-23 18:17:20,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-10-23 18:17:20,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2020-10-23 18:17:20,111 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 69 [2020-10-23 18:17:20,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:17:20,111 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2020-10-23 18:17:20,111 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-10-23 18:17:20,111 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2020-10-23 18:17:20,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-10-23 18:17:20,112 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:17:20,113 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:17:20,327 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:17:20,328 INFO L429 AbstractCegarLoop]: === Iteration 11 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:17:20,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:17:20,330 INFO L82 PathProgramCache]: Analyzing trace with hash -1458107067, now seen corresponding path program 10 times [2020-10-23 18:17:20,330 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:17:20,330 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2000958854] [2020-10-23 18:17:20,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:17:20,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 18:17:20,398 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 18:17:20,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 18:17:20,461 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 18:17:20,516 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-23 18:17:20,516 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-23 18:17:20,517 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-10-23 18:17:20,606 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 06:17:20 BoogieIcfgContainer [2020-10-23 18:17:20,607 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-23 18:17:20,609 INFO L168 Benchmark]: Toolchain (without parser) took 19006.98 ms. Allocated memory was 152.0 MB in the beginning and 330.3 MB in the end (delta: 178.3 MB). Free memory was 128.2 MB in the beginning and 126.4 MB in the end (delta: 1.7 MB). Peak memory consumption was 180.6 MB. Max. memory is 8.0 GB. [2020-10-23 18:17:20,610 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 152.0 MB. Free memory is still 124.1 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 18:17:20,611 INFO L168 Benchmark]: CACSL2BoogieTranslator took 230.02 ms. Allocated memory is still 152.0 MB. Free memory was 127.5 MB in the beginning and 118.1 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-10-23 18:17:20,611 INFO L168 Benchmark]: Boogie Preprocessor took 34.16 ms. Allocated memory is still 152.0 MB. Free memory was 118.1 MB in the beginning and 116.8 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-10-23 18:17:20,618 INFO L168 Benchmark]: RCFGBuilder took 404.78 ms. Allocated memory is still 152.0 MB. Free memory was 116.6 MB in the beginning and 104.5 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2020-10-23 18:17:20,619 INFO L168 Benchmark]: TraceAbstraction took 18321.15 ms. Allocated memory was 152.0 MB in the beginning and 330.3 MB in the end (delta: 178.3 MB). Free memory was 104.1 MB in the beginning and 126.4 MB in the end (delta: -22.4 MB). Peak memory consumption was 156.5 MB. Max. memory is 8.0 GB. [2020-10-23 18:17:20,626 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 152.0 MB. Free memory is still 124.1 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 230.02 ms. Allocated memory is still 152.0 MB. Free memory was 127.5 MB in the beginning and 118.1 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 34.16 ms. Allocated memory is still 152.0 MB. Free memory was 118.1 MB in the beginning and 116.8 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 404.78 ms. Allocated memory is still 152.0 MB. Free memory was 116.6 MB in the beginning and 104.5 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 18321.15 ms. Allocated memory was 152.0 MB in the beginning and 330.3 MB in the end (delta: 178.3 MB). Free memory was 104.1 MB in the beginning and 126.4 MB in the end (delta: -22.4 MB). Peak memory consumption was 156.5 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 4]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] unsigned int input = __VERIFIER_nondet_uint(); [L13] CALL, EXPR id(input) VAL [\old(x)=10] [L7] COND FALSE !(x==0) VAL [\old(x)=10, x=10] [L8] CALL, EXPR id(x-1) VAL [\old(x)=9] [L7] COND FALSE !(x==0) VAL [\old(x)=9, x=9] [L8] CALL, EXPR id(x-1) VAL [\old(x)=8] [L7] COND FALSE !(x==0) VAL [\old(x)=8, x=8] [L8] CALL, EXPR id(x-1) VAL [\old(x)=7] [L7] COND FALSE !(x==0) VAL [\old(x)=7, x=7] [L8] CALL, EXPR id(x-1) VAL [\old(x)=6] [L7] COND FALSE !(x==0) VAL [\old(x)=6, x=6] [L8] CALL, EXPR id(x-1) VAL [\old(x)=5] [L7] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L8] CALL, EXPR id(x-1) VAL [\old(x)=4] [L7] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L8] CALL, EXPR id(x-1) VAL [\old(x)=3] [L7] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L8] CALL, EXPR id(x-1) VAL [\old(x)=2] [L7] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L8] CALL, EXPR id(x-1) VAL [\old(x)=1] [L7] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L8] CALL, EXPR id(x-1) VAL [\old(x)=0] [L7] COND TRUE x==0 [L7] return 0; VAL [\old(x)=0, \result=0, x=0] [L8] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=5, id(x-1)=4, x=5] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=6, id(x-1)=5, x=6] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=7, id(x-1)=6, x=7] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=8, id(x-1)=7, x=8] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=9, id(x-1)=8, x=9] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=10, id(x-1)=9, x=10] [L8] return id(x-1) + 1; [L13] RET, EXPR id(input) VAL [id(input)=10, input=10] [L13] unsigned int result = id(input); [L14] COND TRUE result == 10 VAL [input=10, result=10] [L15] CALL reach_error() [L4] __assert_fail("0", "id_o10.c", 4, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 18.1s, OverallIterations: 11, TraceHistogramMax: 11, AutomataDifference: 9.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 189 SDtfs, 151 SDslu, 902 SDs, 0 SdLazy, 3557 SolverSat, 95 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 786 GetRequests, 518 SyntacticMatches, 9 SemanticMatches, 259 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 933 ImplicationChecksByTransitivity, 8.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=47occurred in iteration=10, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 10 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.7s SatisfiabilityAnalysisTime, 5.1s InterpolantComputationTime, 900 NumberOfCodeBlocks, 900 NumberOfCodeBlocksAsserted, 46 NumberOfCheckSat, 806 ConstructedInterpolants, 0 QuantifiedInterpolants, 156720 SizeOfPredicates, 9 NumberOfNonLiveVariables, 1404 ConjunctsInSsa, 244 ConjunctsInUnsatCore, 19 InterpolantComputations, 1 PerfectInterpolantSequences, 900/1800 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...