/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_unwindbound2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 13:55:05,550 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 13:55:05,552 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 13:55:05,570 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 13:55:05,602 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 13:55:05,603 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 13:55:05,603 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 13:55:05,604 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 13:55:05,605 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 13:55:05,605 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 13:55:05,607 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 13:55:05,608 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 13:55:05,614 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 13:55:05,621 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 13:55:05,622 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 13:55:05,625 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 13:55:05,627 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 13:55:05,632 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 13:55:05,635 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 13:55:05,637 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 13:55:05,640 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 13:55:05,675 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 13:55:05,675 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 13:55:05,678 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 13:55:05,678 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 13:55:05,678 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 13:55:05,678 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 13:55:05,678 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 13:55:05,678 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 13:55:05,678 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 13:55:05,679 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 13:55:05,679 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 13:55:05,679 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 13:55:05,679 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 13:55:05,679 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 13:55:05,680 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 13:55:05,680 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 13:55:05,680 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 13:55:05,680 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 13:55:05,680 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 13:55:05,680 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 13:55:05,680 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:55:05,680 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 13:55:05,680 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 13:55:05,680 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 13:55:05,681 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 13:55:05,681 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 13:55:05,681 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 13:55:05,681 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 13:55:05,681 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 13:55:05,957 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 13:55:05,976 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 13:55:05,978 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 13:55:05,979 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 13:55:05,980 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 13:55:05,980 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_unwindbound2.c [2021-05-02 13:55:06,025 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a7b5d727e/e883d12585864ecf8d492074d9046afa/FLAGd75b5679f [2021-05-02 13:55:06,368 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 13:55:06,370 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_unwindbound2.c [2021-05-02 13:55:06,375 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a7b5d727e/e883d12585864ecf8d492074d9046afa/FLAGd75b5679f [2021-05-02 13:55:06,388 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a7b5d727e/e883d12585864ecf8d492074d9046afa [2021-05-02 13:55:06,390 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 13:55:06,392 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 13:55:06,393 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 13:55:06,393 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 13:55:06,396 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 13:55:06,396 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:55:06" (1/1) ... [2021-05-02 13:55:06,397 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@44629bde and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:55:06, skipping insertion in model container [2021-05-02 13:55:06,397 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:55:06" (1/1) ... [2021-05-02 13:55:06,402 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 13:55:06,420 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 13:55:06,510 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_unwindbound2.c[596,609] [2021-05-02 13:55:06,530 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:55:06,535 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 13:55:06,570 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_unwindbound2.c[596,609] [2021-05-02 13:55:06,583 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:55:06,592 INFO L208 MainTranslator]: Completed translation [2021-05-02 13:55:06,592 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:55:06 WrapperNode [2021-05-02 13:55:06,592 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 13:55:06,593 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 13:55:06,593 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 13:55:06,593 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 13:55:06,599 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:55:06" (1/1) ... [2021-05-02 13:55:06,599 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:55:06" (1/1) ... [2021-05-02 13:55:06,603 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:55:06" (1/1) ... [2021-05-02 13:55:06,603 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:55:06" (1/1) ... [2021-05-02 13:55:06,610 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:55:06" (1/1) ... [2021-05-02 13:55:06,612 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:55:06" (1/1) ... [2021-05-02 13:55:06,613 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:55:06" (1/1) ... [2021-05-02 13:55:06,614 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 13:55:06,615 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 13:55:06,615 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 13:55:06,615 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 13:55:06,615 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:55:06" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:55:06,675 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 13:55:06,675 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 13:55:06,675 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 13:55:06,675 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 13:55:06,676 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 13:55:06,676 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 13:55:06,676 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 13:55:06,676 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 13:55:06,676 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 13:55:06,676 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 13:55:06,676 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_short [2021-05-02 13:55:06,676 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 13:55:06,676 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 13:55:06,676 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 13:55:06,676 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 13:55:06,676 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 13:55:06,676 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 13:55:06,677 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 13:55:06,677 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 13:55:06,677 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 13:55:06,928 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 13:55:06,929 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 13:55:06,930 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:55:06 BoogieIcfgContainer [2021-05-02 13:55:06,930 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 13:55:06,931 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 13:55:06,931 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 13:55:06,933 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 13:55:06,933 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 01:55:06" (1/3) ... [2021-05-02 13:55:06,933 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b9a48f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:55:06, skipping insertion in model container [2021-05-02 13:55:06,933 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:55:06" (2/3) ... [2021-05-02 13:55:06,934 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b9a48f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:55:06, skipping insertion in model container [2021-05-02 13:55:06,934 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:55:06" (3/3) ... [2021-05-02 13:55:06,935 INFO L111 eAbstractionObserver]: Analyzing ICFG cohencu-ll_unwindbound2.c [2021-05-02 13:55:06,938 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 13:55:06,940 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 13:55:06,956 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 13:55:06,996 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 13:55:06,996 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 13:55:06,996 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 13:55:06,996 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 13:55:06,996 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 13:55:06,996 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 13:55:06,996 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 13:55:06,996 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 13:55:07,021 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 13:55:07,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 13:55:07,024 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:55:07,029 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:55:07,029 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:55:07,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:55:07,039 INFO L82 PathProgramCache]: Analyzing trace with hash 1839589780, now seen corresponding path program 1 times [2021-05-02 13:55:07,045 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:55:07,045 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [696435332] [2021-05-02 13:55:07,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:55:07,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:55:07,239 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:55:07,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:55:07,260 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:55:07,260 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:55:07,261 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [696435332] [2021-05-02 13:55:07,262 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [696435332] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:55:07,262 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:55:07,262 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 13:55:07,262 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496380225] [2021-05-02 13:55:07,265 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 13:55:07,265 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:55:07,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 13:55:07,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:55:07,277 INFO L87 Difference]: Start difference. First operand has 31 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:55:07,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:55:07,422 INFO L93 Difference]: Finished difference Result 57 states and 95 transitions. [2021-05-02 13:55:07,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 13:55:07,423 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 13:55:07,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:55:07,429 INFO L225 Difference]: With dead ends: 57 [2021-05-02 13:55:07,429 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 13:55:07,432 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 47.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:55:07,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 13:55:07,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-05-02 13:55:07,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 13 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 13:55:07,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 37 transitions. [2021-05-02 13:55:07,462 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 37 transitions. Word has length 11 [2021-05-02 13:55:07,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:55:07,462 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 37 transitions. [2021-05-02 13:55:07,462 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:55:07,462 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 37 transitions. [2021-05-02 13:55:07,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 13:55:07,463 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:55:07,463 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:55:07,463 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 13:55:07,463 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:55:07,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:55:07,464 INFO L82 PathProgramCache]: Analyzing trace with hash 660459433, now seen corresponding path program 1 times [2021-05-02 13:55:07,464 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:55:07,464 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1049632690] [2021-05-02 13:55:07,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:55:07,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:55:07,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:55:07,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:55:07,549 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:55:07,549 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:55:07,550 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1049632690] [2021-05-02 13:55:07,550 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1049632690] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:55:07,550 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:55:07,550 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:55:07,550 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421518334] [2021-05-02 13:55:07,551 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 13:55:07,551 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:55:07,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 13:55:07,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:55:07,551 INFO L87 Difference]: Start difference. First operand 26 states and 37 transitions. Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:55:07,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:55:07,648 INFO L93 Difference]: Finished difference Result 40 states and 56 transitions. [2021-05-02 13:55:07,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:55:07,648 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 13:55:07,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:55:07,650 INFO L225 Difference]: With dead ends: 40 [2021-05-02 13:55:07,650 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 13:55:07,651 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 43.3ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:55:07,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 13:55:07,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-05-02 13:55:07,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 13 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 13:55:07,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 39 transitions. [2021-05-02 13:55:07,666 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 39 transitions. Word has length 12 [2021-05-02 13:55:07,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:55:07,666 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 39 transitions. [2021-05-02 13:55:07,666 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:55:07,666 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 39 transitions. [2021-05-02 13:55:07,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 13:55:07,666 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:55:07,667 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:55:07,667 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 13:55:07,667 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:55:07,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:55:07,667 INFO L82 PathProgramCache]: Analyzing trace with hash 662008565, now seen corresponding path program 1 times [2021-05-02 13:55:07,667 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:55:07,668 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1661969414] [2021-05-02 13:55:07,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:55:07,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:55:07,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:55:07,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:55:07,738 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:55:07,739 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:55:07,739 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1661969414] [2021-05-02 13:55:07,739 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1661969414] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:55:07,739 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:55:07,739 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 13:55:07,739 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895244663] [2021-05-02 13:55:07,739 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:55:07,739 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:55:07,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:55:07,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:55:07,740 INFO L87 Difference]: Start difference. First operand 28 states and 39 transitions. Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:55:07,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:55:07,941 INFO L93 Difference]: Finished difference Result 34 states and 44 transitions. [2021-05-02 13:55:07,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:55:07,941 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 13:55:07,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:55:07,942 INFO L225 Difference]: With dead ends: 34 [2021-05-02 13:55:07,942 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 13:55:07,942 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 130.2ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:55:07,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 13:55:07,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 13:55:07,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 13 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 13:55:07,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2021-05-02 13:55:07,948 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 12 [2021-05-02 13:55:07,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:55:07,948 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2021-05-02 13:55:07,948 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:55:07,948 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2021-05-02 13:55:07,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 13:55:07,948 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:55:07,948 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:55:07,949 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 13:55:07,949 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:55:07,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:55:07,949 INFO L82 PathProgramCache]: Analyzing trace with hash 2023221563, now seen corresponding path program 1 times [2021-05-02 13:55:07,949 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:55:07,949 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1302637481] [2021-05-02 13:55:07,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:55:07,958 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:55:07,958 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1101831952] [2021-05-02 13:55:07,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:08,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:55:08,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 13:55:08,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:55:08,163 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:55:08,163 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:55:08,163 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1302637481] [2021-05-02 13:55:08,163 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:55:08,164 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1101831952] [2021-05-02 13:55:08,164 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1101831952] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:55:08,164 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:55:08,164 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 13:55:08,164 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [552626154] [2021-05-02 13:55:08,164 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:55:08,164 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:55:08,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:55:08,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:55:08,165 INFO L87 Difference]: Start difference. First operand 32 states and 42 transitions. Second operand has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:55:08,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:55:08,329 INFO L93 Difference]: Finished difference Result 54 states and 73 transitions. [2021-05-02 13:55:08,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:55:08,330 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2021-05-02 13:55:08,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:55:08,331 INFO L225 Difference]: With dead ends: 54 [2021-05-02 13:55:08,331 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 13:55:08,331 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 57.7ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:55:08,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 13:55:08,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2021-05-02 13:55:08,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 24 states have internal predecessors, (26), 23 states have call successors, (23), 6 states have call predecessors, (23), 5 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-02 13:55:08,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 70 transitions. [2021-05-02 13:55:08,338 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 70 transitions. Word has length 17 [2021-05-02 13:55:08,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:55:08,338 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 70 transitions. [2021-05-02 13:55:08,338 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:55:08,338 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 70 transitions. [2021-05-02 13:55:08,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 13:55:08,339 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:55:08,339 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:55:08,539 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:08,540 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:55:08,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:55:08,540 INFO L82 PathProgramCache]: Analyzing trace with hash 1612678773, now seen corresponding path program 1 times [2021-05-02 13:55:08,540 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:55:08,540 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [274871932] [2021-05-02 13:55:08,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:55:08,547 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:55:08,547 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [403666618] [2021-05-02 13:55:08,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:08,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:55:08,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 13:55:08,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:55:08,691 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:55:08,691 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:55:08,691 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [274871932] [2021-05-02 13:55:08,691 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:55:08,691 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [403666618] [2021-05-02 13:55:08,691 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [403666618] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:55:08,692 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:55:08,692 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 13:55:08,692 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060320826] [2021-05-02 13:55:08,693 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:55:08,693 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:55:08,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:55:08,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:55:08,693 INFO L87 Difference]: Start difference. First operand 51 states and 70 transitions. Second operand has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:55:08,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:55:08,873 INFO L93 Difference]: Finished difference Result 58 states and 76 transitions. [2021-05-02 13:55:08,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:55:08,874 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 22 [2021-05-02 13:55:08,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:55:08,876 INFO L225 Difference]: With dead ends: 58 [2021-05-02 13:55:08,876 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 13:55:08,877 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 60.7ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:55:08,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 13:55:08,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2021-05-02 13:55:08,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 25 states have (on average 1.16) internal successors, (29), 27 states have internal predecessors, (29), 23 states have call successors, (23), 7 states have call predecessors, (23), 6 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-02 13:55:08,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 73 transitions. [2021-05-02 13:55:08,898 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 73 transitions. Word has length 22 [2021-05-02 13:55:08,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:55:08,898 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 73 transitions. [2021-05-02 13:55:08,899 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:55:08,899 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 73 transitions. [2021-05-02 13:55:08,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 13:55:08,900 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:55:08,900 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:55:09,112 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:09,113 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:55:09,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:55:09,113 INFO L82 PathProgramCache]: Analyzing trace with hash 1625830715, now seen corresponding path program 1 times [2021-05-02 13:55:09,113 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:55:09,114 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [569402172] [2021-05-02 13:55:09,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:55:09,130 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:55:09,130 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1822266005] [2021-05-02 13:55:09,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:09,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:55:09,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 13:55:09,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:55:09,281 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:55:09,281 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:55:09,282 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [569402172] [2021-05-02 13:55:09,282 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:55:09,282 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1822266005] [2021-05-02 13:55:09,282 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1822266005] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:55:09,282 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:55:09,282 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 13:55:09,282 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693236901] [2021-05-02 13:55:09,282 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:55:09,282 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:55:09,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:55:09,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:55:09,283 INFO L87 Difference]: Start difference. First operand 55 states and 73 transitions. Second operand has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 13:55:09,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:55:09,462 INFO L93 Difference]: Finished difference Result 62 states and 79 transitions. [2021-05-02 13:55:09,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:55:09,462 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 27 [2021-05-02 13:55:09,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:55:09,463 INFO L225 Difference]: With dead ends: 62 [2021-05-02 13:55:09,463 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 13:55:09,463 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 37.2ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:55:09,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 13:55:09,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-05-02 13:55:09,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 29 states have internal predecessors, (31), 18 states have call successors, (18), 8 states have call predecessors, (18), 7 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-02 13:55:09,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 65 transitions. [2021-05-02 13:55:09,470 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 65 transitions. Word has length 27 [2021-05-02 13:55:09,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:55:09,470 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 65 transitions. [2021-05-02 13:55:09,470 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 13:55:09,470 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 65 transitions. [2021-05-02 13:55:09,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 13:55:09,471 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:55:09,471 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:55:09,682 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:09,682 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:55:09,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:55:09,682 INFO L82 PathProgramCache]: Analyzing trace with hash 1440923632, now seen corresponding path program 1 times [2021-05-02 13:55:09,682 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:55:09,683 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1504366117] [2021-05-02 13:55:09,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:55:09,689 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:55:09,689 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1087631291] [2021-05-02 13:55:09,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:09,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:55:09,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 13:55:09,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:55:09,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:09,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:09,764 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:09,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:09,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:09,779 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:09,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:09,825 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:09,840 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 30 proven. 2 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-05-02 13:55:09,840 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:55:09,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1504366117] [2021-05-02 13:55:09,840 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:55:09,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087631291] [2021-05-02 13:55:09,840 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1087631291] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:55:09,840 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:55:09,840 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 13:55:09,840 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1064579983] [2021-05-02 13:55:09,841 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 13:55:09,841 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:55:09,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 13:55:09,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:55:09,841 INFO L87 Difference]: Start difference. First operand 54 states and 65 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 4 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 13:55:09,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:55:09,894 INFO L93 Difference]: Finished difference Result 72 states and 87 transitions. [2021-05-02 13:55:09,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:55:09,894 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 4 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 45 [2021-05-02 13:55:09,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:55:09,895 INFO L225 Difference]: With dead ends: 72 [2021-05-02 13:55:09,895 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 13:55:09,895 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 28.6ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:55:09,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 13:55:09,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-05-02 13:55:09,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 30 states have (on average 1.1) internal successors, (33), 31 states have internal predecessors, (33), 18 states have call successors, (18), 8 states have call predecessors, (18), 7 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-02 13:55:09,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 67 transitions. [2021-05-02 13:55:09,900 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 67 transitions. Word has length 45 [2021-05-02 13:55:09,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:55:09,900 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 67 transitions. [2021-05-02 13:55:09,900 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 4 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 13:55:09,901 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 67 transitions. [2021-05-02 13:55:09,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 13:55:09,901 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:55:09,901 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:55:10,116 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:10,116 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:55:10,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:55:10,117 INFO L82 PathProgramCache]: Analyzing trace with hash 1933038948, now seen corresponding path program 1 times [2021-05-02 13:55:10,117 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:55:10,117 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1031652447] [2021-05-02 13:55:10,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:55:10,130 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:55:10,130 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [54293477] [2021-05-02 13:55:10,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:10,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:55:10,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 13:55:10,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:55:10,286 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 26 proven. 5 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 13:55:10,286 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:55:10,286 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1031652447] [2021-05-02 13:55:10,286 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:55:10,286 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [54293477] [2021-05-02 13:55:10,286 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [54293477] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:55:10,286 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:55:10,286 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 13:55:10,286 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728663188] [2021-05-02 13:55:10,287 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:55:10,287 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:55:10,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:55:10,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:55:10,287 INFO L87 Difference]: Start difference. First operand 56 states and 67 transitions. Second operand has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 13:55:10,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:55:10,452 INFO L93 Difference]: Finished difference Result 78 states and 98 transitions. [2021-05-02 13:55:10,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:55:10,454 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 45 [2021-05-02 13:55:10,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:55:10,455 INFO L225 Difference]: With dead ends: 78 [2021-05-02 13:55:10,456 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 13:55:10,456 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 47.4ms TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:55:10,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 13:55:10,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2021-05-02 13:55:10,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 37 states have (on average 1.1081081081081081) internal successors, (41), 39 states have internal predecessors, (41), 28 states have call successors, (28), 10 states have call predecessors, (28), 9 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) [2021-05-02 13:55:10,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 95 transitions. [2021-05-02 13:55:10,472 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 95 transitions. Word has length 45 [2021-05-02 13:55:10,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:55:10,472 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 95 transitions. [2021-05-02 13:55:10,472 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 13:55:10,472 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 95 transitions. [2021-05-02 13:55:10,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 13:55:10,477 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:55:10,477 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:55:10,685 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:10,685 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:55:10,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:55:10,685 INFO L82 PathProgramCache]: Analyzing trace with hash 780782572, now seen corresponding path program 2 times [2021-05-02 13:55:10,685 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:55:10,685 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1059047063] [2021-05-02 13:55:10,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:55:10,692 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:55:10,692 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1559511027] [2021-05-02 13:55:10,692 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 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:10,737 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:55:10,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:55:10,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 13:55:10,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:55:10,858 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 28 proven. 9 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 13:55:10,858 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:55:10,859 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1059047063] [2021-05-02 13:55:10,859 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:55:10,859 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1559511027] [2021-05-02 13:55:10,859 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1559511027] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:55:10,859 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:55:10,859 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 13:55:10,859 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726007376] [2021-05-02 13:55:10,859 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:55:10,860 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:55:10,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:55:10,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:55:10,861 INFO L87 Difference]: Start difference. First operand 75 states and 95 transitions. Second operand has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 13:55:13,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:55:13,071 INFO L93 Difference]: Finished difference Result 82 states and 101 transitions. [2021-05-02 13:55:13,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:55:13,071 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) Word has length 50 [2021-05-02 13:55:13,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:55:13,072 INFO L225 Difference]: With dead ends: 82 [2021-05-02 13:55:13,072 INFO L226 Difference]: Without dead ends: 78 [2021-05-02 13:55:13,072 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 46.4ms TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:55:13,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-02 13:55:13,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2021-05-02 13:55:13,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 40 states have (on average 1.1) internal successors, (44), 42 states have internal predecessors, (44), 27 states have call successors, (27), 11 states have call predecessors, (27), 10 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 13:55:13,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 95 transitions. [2021-05-02 13:55:13,078 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 95 transitions. Word has length 50 [2021-05-02 13:55:13,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:55:13,078 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 95 transitions. [2021-05-02 13:55:13,078 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 13:55:13,078 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 95 transitions. [2021-05-02 13:55:13,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 13:55:13,079 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:55:13,079 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:55:13,284 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:13,285 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:55:13,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:55:13,285 INFO L82 PathProgramCache]: Analyzing trace with hash 1284663070, now seen corresponding path program 1 times [2021-05-02 13:55:13,285 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:55:13,285 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [24203512] [2021-05-02 13:55:13,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:55:13,291 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:55:13,291 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [192631424] [2021-05-02 13:55:13,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:13,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:55:13,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 13:55:13,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:55:13,357 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,461 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,489 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,513 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,528 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,530 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,556 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,561 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,564 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,587 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,613 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,616 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,621 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,685 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,725 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,779 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,781 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,825 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,856 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,857 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,863 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:55:13,882 INFO L134 CoverageAnalysis]: Checked inductivity of 250 backedges. 51 proven. 9 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-05-02 13:55:13,882 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:55:13,882 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [24203512] [2021-05-02 13:55:13,882 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:55:13,882 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [192631424] [2021-05-02 13:55:13,882 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [192631424] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:55:13,882 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:55:13,882 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 13:55:13,882 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1439365621] [2021-05-02 13:55:13,883 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:55:13,883 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:55:13,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:55:13,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:55:13,883 INFO L87 Difference]: Start difference. First operand 78 states and 95 transitions. Second operand has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 13:55:14,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:55:14,130 INFO L93 Difference]: Finished difference Result 84 states and 100 transitions. [2021-05-02 13:55:14,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:55:14,131 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 71 [2021-05-02 13:55:14,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:55:14,132 INFO L225 Difference]: With dead ends: 84 [2021-05-02 13:55:14,132 INFO L226 Difference]: Without dead ends: 82 [2021-05-02 13:55:14,132 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 168.0ms TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:55:14,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-02 13:55:14,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2021-05-02 13:55:14,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 43 states have (on average 1.0930232558139534) internal successors, (47), 45 states have internal predecessors, (47), 27 states have call successors, (27), 12 states have call predecessors, (27), 11 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 13:55:14,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 98 transitions. [2021-05-02 13:55:14,138 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 98 transitions. Word has length 71 [2021-05-02 13:55:14,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:55:14,138 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 98 transitions. [2021-05-02 13:55:14,138 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 13:55:14,139 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 98 transitions. [2021-05-02 13:55:14,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 13:55:14,139 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:55:14,139 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:55:14,355 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 13:55:14,355 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:55:14,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:55:14,356 INFO L82 PathProgramCache]: Analyzing trace with hash -2139863911, now seen corresponding path program 2 times [2021-05-02 13:55:14,356 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:55:14,356 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [374286337] [2021-05-02 13:55:14,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:55:14,362 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:55:14,362 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1580578966] [2021-05-02 13:55:14,362 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:55:14,446 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:55:14,446 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2021-05-02 13:55:14,446 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 13:55:14,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 13:55:14,481 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 13:55:14,549 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-05-02 13:55:14,550 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-02 13:55:14,750 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 13:55:14,790 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 01:55:14 BoogieIcfgContainer [2021-05-02 13:55:14,790 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 13:55:14,791 INFO L168 Benchmark]: Toolchain (without parser) took 8399.25 ms. Allocated memory was 188.7 MB in the beginning and 241.2 MB in the end (delta: 52.4 MB). Free memory was 152.0 MB in the beginning and 105.7 MB in the end (delta: 46.3 MB). Peak memory consumption was 97.8 MB. Max. memory is 8.0 GB. [2021-05-02 13:55:14,791 INFO L168 Benchmark]: CDTParser took 0.13 ms. Allocated memory is still 188.7 MB. Free memory is still 168.4 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 13:55:14,791 INFO L168 Benchmark]: CACSL2BoogieTranslator took 199.20 ms. Allocated memory is still 188.7 MB. Free memory was 151.8 MB in the beginning and 170.7 MB in the end (delta: -18.9 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2021-05-02 13:55:14,791 INFO L168 Benchmark]: Boogie Preprocessor took 21.41 ms. Allocated memory is still 188.7 MB. Free memory was 170.2 MB in the beginning and 169.1 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-02 13:55:14,791 INFO L168 Benchmark]: RCFGBuilder took 315.16 ms. Allocated memory is still 188.7 MB. Free memory was 169.1 MB in the beginning and 152.4 MB in the end (delta: 16.8 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. [2021-05-02 13:55:14,791 INFO L168 Benchmark]: TraceAbstraction took 7859.82 ms. Allocated memory was 188.7 MB in the beginning and 241.2 MB in the end (delta: 52.4 MB). Free memory was 151.8 MB in the beginning and 105.7 MB in the end (delta: 46.1 MB). Peak memory consumption was 99.6 MB. Max. memory is 8.0 GB. [2021-05-02 13:55:14,792 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.13 ms. Allocated memory is still 188.7 MB. Free memory is still 168.4 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 199.20 ms. Allocated memory is still 188.7 MB. Free memory was 151.8 MB in the beginning and 170.7 MB in the end (delta: -18.9 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 21.41 ms. Allocated memory is still 188.7 MB. Free memory was 170.2 MB in the beginning and 169.1 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 315.16 ms. Allocated memory is still 188.7 MB. Free memory was 169.1 MB in the beginning and 152.4 MB in the end (delta: 16.8 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. * TraceAbstraction took 7859.82 ms. Allocated memory was 188.7 MB in the beginning and 241.2 MB in the end (delta: 52.4 MB). Free memory was 151.8 MB in the beginning and 105.7 MB in the end (delta: 46.1 MB). Peak memory consumption was 99.6 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 17]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L22] int counter = 0; VAL [\old(counter)=15, counter=0] [L24] short a; [L25] long long n, x, y, z; [L26] a = __VERIFIER_nondet_unsigned_short() [L28] n = 0 [L29] x = 0 [L30] y = 1 [L31] z = 6 VAL [\old(counter)=0, a=2, counter=0, n=0, x=0, y=1, z=6] [L33] EXPR counter++ VAL [\old(counter)=0, a=2, counter=1, counter++=0, n=0, x=0, y=1, z=6] [L33] COND TRUE counter++<2 [L34] CALL __VERIFIER_assert(z == 6 * n + 6) VAL [\old(cond)=1, \old(counter)=0, counter=1] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=1] [L34] RET __VERIFIER_assert(z == 6 * n + 6) VAL [\old(counter)=0, a=2, counter=1, n=0, x=0, y=1, z=6] [L35] CALL __VERIFIER_assert(y == 3 * n * n + 3 * n + 1) VAL [\old(cond)=1, \old(counter)=0, counter=1] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=1] [L35] RET __VERIFIER_assert(y == 3 * n * n + 3 * n + 1) VAL [\old(counter)=0, a=2, counter=1, n=0, x=0, y=1, z=6] [L36] CALL __VERIFIER_assert(x == n * n * n) VAL [\old(cond)=1, \old(counter)=0, counter=1] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=1] [L36] RET __VERIFIER_assert(x == n * n * n) VAL [\old(counter)=0, a=2, counter=1, n=0, x=0, y=1, z=6] [L37] CALL __VERIFIER_assert(y*z - 18*x - 12*y + 2*z - 6 == 0) VAL [\old(cond)=1, \old(counter)=0, counter=1] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=1] [L37] RET __VERIFIER_assert(y*z - 18*x - 12*y + 2*z - 6 == 0) VAL [\old(counter)=0, a=2, counter=1, n=0, x=0, y=1, z=6] [L38] CALL __VERIFIER_assert((z*z) - 12*y - 6*z + 12 == 0) VAL [\old(cond)=1, \old(counter)=0, counter=1] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=1] [L38] RET __VERIFIER_assert((z*z) - 12*y - 6*z + 12 == 0) VAL [\old(counter)=0, a=2, counter=1, n=0, x=0, y=1, z=6] [L39] COND FALSE !(!(n <= a)) [L42] n = n + 1 [L43] x = x + y [L44] y = y + z [L45] z = z + 6 VAL [\old(counter)=0, a=2, counter=1, n=1, x=1, y=7, z=12] [L33] EXPR counter++ VAL [\old(counter)=0, a=2, counter=2, counter++=1, n=1, x=1, y=7, z=12] [L33] COND TRUE counter++<2 [L34] CALL __VERIFIER_assert(z == 6 * n + 6) VAL [\old(cond)=1, \old(counter)=0, counter=2] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=2] [L34] RET __VERIFIER_assert(z == 6 * n + 6) VAL [\old(counter)=0, a=2, counter=2, n=1, x=1, y=7, z=12] [L35] CALL __VERIFIER_assert(y == 3 * n * n + 3 * n + 1) VAL [\old(cond)=1, \old(counter)=0, counter=2] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=2] [L35] RET __VERIFIER_assert(y == 3 * n * n + 3 * n + 1) VAL [\old(counter)=0, a=2, counter=2, n=1, x=1, y=7, z=12] [L36] CALL __VERIFIER_assert(x == n * n * n) VAL [\old(cond)=1, \old(counter)=0, counter=2] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=2] [L36] RET __VERIFIER_assert(x == n * n * n) VAL [\old(counter)=0, a=2, counter=2, n=1, x=1, y=7, z=12] [L37] CALL __VERIFIER_assert(y*z - 18*x - 12*y + 2*z - 6 == 0) VAL [\old(cond)=1, \old(counter)=0, counter=2] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=2] [L37] RET __VERIFIER_assert(y*z - 18*x - 12*y + 2*z - 6 == 0) VAL [\old(counter)=0, a=2, counter=2, n=1, x=1, y=7, z=12] [L38] CALL __VERIFIER_assert((z*z) - 12*y - 6*z + 12 == 0) VAL [\old(cond)=1, \old(counter)=0, counter=2] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=2] [L38] RET __VERIFIER_assert((z*z) - 12*y - 6*z + 12 == 0) VAL [\old(counter)=0, a=2, counter=2, n=1, x=1, y=7, z=12] [L39] COND FALSE !(!(n <= a)) [L42] n = n + 1 [L43] x = x + y [L44] y = y + z [L45] z = z + 6 VAL [\old(counter)=0, a=2, counter=2, n=2, x=8, y=19, z=18] [L33] EXPR counter++ VAL [\old(counter)=0, a=2, counter=3, counter++=2, n=2, x=8, y=19, z=18] [L33] COND FALSE !(counter++<2) [L48] CALL __VERIFIER_assert(z == 6*n + 6) VAL [\old(cond)=1, \old(counter)=0, counter=3] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=3] [L48] RET __VERIFIER_assert(z == 6*n + 6) VAL [\old(counter)=0, a=2, counter=3, n=2, x=8, y=19, z=18] [L49] CALL __VERIFIER_assert(6*a*x - x*z + 12*x == 0) VAL [\old(cond)=0, \old(counter)=0, counter=3] [L15] COND TRUE !(cond) VAL [\old(cond)=0, \old(counter)=0, cond=0, counter=3] [L17] reach_error() VAL [\old(cond)=0, \old(counter)=0, cond=0, counter=3] - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 38 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 7756.3ms, OverallIterations: 11, TraceHistogramMax: 12, EmptinessCheckTime: 19.3ms, AutomataDifference: 3685.9ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 18.0ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 324 SDtfs, 118 SDslu, 935 SDs, 0 SdLazy, 1353 SolverSat, 139 SolverUnsat, 1 SolverUnknown, 0 SolverNotchecked, 2990.8ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 305 GetRequests, 236 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 667.3ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=82occurred in iteration=10, InterpolantAutomatonStates: 69, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 106.7ms AutomataMinimizationTime, 10 MinimizatonAttempts, 4 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 86.3ms SsaConstructionTime, 225.6ms SatisfiabilityAnalysisTime, 1455.0ms InterpolantComputationTime, 385 NumberOfCodeBlocks, 385 NumberOfCodeBlocksAsserted, 13 NumberOfCheckSat, 302 ConstructedInterpolants, 0 QuantifiedInterpolants, 1651 SizeOfPredicates, 20 NumberOfNonLiveVariables, 1116 ConjunctsInSsa, 139 ConjunctsInUnsatCore, 10 InterpolantComputations, 3 PerfectInterpolantSequences, 494/531 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...