/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/dijkstra-u_valuebound5.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 01:52:52,809 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 01:52:52,811 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 01:52:52,841 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 01:52:52,856 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 01:52:52,857 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 01:52:52,859 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 01:52:52,861 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 01:52:52,863 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 01:52:52,863 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 01:52:52,865 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 01:52:52,869 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 01:52:52,870 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 01:52:52,871 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 01:52:52,872 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 01:52:52,873 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 01:52:52,878 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 01:52:52,901 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 01:52:52,902 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 01:52:52,903 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 01:52:52,906 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 [2021-05-06 01:52:52,936 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 01:52:52,936 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 01:52:52,938 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-06 01:52:52,938 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-06 01:52:52,939 INFO L138 SettingsManager]: * Use SBE=true [2021-05-06 01:52:52,939 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 01:52:52,939 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 01:52:52,939 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 01:52:52,939 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 01:52:52,939 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 01:52:52,940 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 01:52:52,940 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 01:52:52,940 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 01:52:52,940 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 01:52:52,940 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 01:52:52,940 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 01:52:52,941 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 01:52:52,941 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 01:52:52,941 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 01:52:52,941 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 01:52:52,941 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 01:52:52,941 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 01:52:52,941 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-06 01:52:52,941 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-06 01:52:52,941 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 01:52:52,942 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-06 01:52:52,942 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 01:52:52,942 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-06 01:52:52,942 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 01:52:53,195 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 01:52:53,208 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 01:52:53,209 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 01:52:53,210 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 01:52:53,211 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 01:52:53,211 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/dijkstra-u_valuebound5.c [2021-05-06 01:52:53,284 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3f84f4afa/1f00acf99b134f97a6c2bd266f9fdc03/FLAG89912fc73 [2021-05-06 01:52:53,931 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 01:52:53,931 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/dijkstra-u_valuebound5.c [2021-05-06 01:52:53,935 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3f84f4afa/1f00acf99b134f97a6c2bd266f9fdc03/FLAG89912fc73 [2021-05-06 01:52:54,057 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3f84f4afa/1f00acf99b134f97a6c2bd266f9fdc03 [2021-05-06 01:52:54,059 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 01:52:54,061 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 01:52:54,063 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 01:52:54,064 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 01:52:54,066 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 01:52:54,066 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 01:52:54" (1/1) ... [2021-05-06 01:52:54,067 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1fdaad8e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:52:54, skipping insertion in model container [2021-05-06 01:52:54,067 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 01:52:54" (1/1) ... [2021-05-06 01:52:54,072 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 01:52:54,085 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 01:52:54,189 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/dijkstra-u_valuebound5.c[533,546] [2021-05-06 01:52:54,216 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 01:52:54,221 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 01:52:54,229 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/dijkstra-u_valuebound5.c[533,546] [2021-05-06 01:52:54,292 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 01:52:54,312 INFO L208 MainTranslator]: Completed translation [2021-05-06 01:52:54,312 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:52:54 WrapperNode [2021-05-06 01:52:54,312 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 01:52:54,314 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 01:52:54,314 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 01:52:54,315 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 01:52:54,321 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:52:54" (1/1) ... [2021-05-06 01:52:54,321 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:52:54" (1/1) ... [2021-05-06 01:52:54,335 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:52:54" (1/1) ... [2021-05-06 01:52:54,335 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:52:54" (1/1) ... [2021-05-06 01:52:54,343 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:52:54" (1/1) ... [2021-05-06 01:52:54,346 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:52:54" (1/1) ... [2021-05-06 01:52:54,347 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:52:54" (1/1) ... [2021-05-06 01:52:54,348 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 01:52:54,348 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 01:52:54,348 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 01:52:54,348 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 01:52:54,349 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:52:54" (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 [2021-05-06 01:52:54,403 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 01:52:54,404 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 01:52:54,404 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 01:52:54,404 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 01:52:54,404 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 01:52:54,404 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 01:52:54,404 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 01:52:54,404 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 01:52:54,405 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 01:52:54,405 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 01:52:54,405 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-06 01:52:54,405 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 01:52:54,406 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 01:52:54,406 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 01:52:54,406 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 01:52:54,406 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 01:52:54,406 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 01:52:54,407 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 01:52:54,407 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 01:52:54,407 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 01:52:54,617 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 01:52:54,617 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 01:52:54,618 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 01:52:54 BoogieIcfgContainer [2021-05-06 01:52:54,618 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 01:52:54,619 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 01:52:54,619 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 01:52:54,621 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 01:52:54,621 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 01:52:54" (1/3) ... [2021-05-06 01:52:54,622 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@177e4c2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 01:52:54, skipping insertion in model container [2021-05-06 01:52:54,622 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:52:54" (2/3) ... [2021-05-06 01:52:54,622 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@177e4c2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 01:52:54, skipping insertion in model container [2021-05-06 01:52:54,622 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 01:52:54" (3/3) ... [2021-05-06 01:52:54,623 INFO L111 eAbstractionObserver]: Analyzing ICFG dijkstra-u_valuebound5.c [2021-05-06 01:52:54,626 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-06 01:52:54,628 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 01:52:54,638 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 01:52:54,651 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 01:52:54,652 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 01:52:54,652 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-06 01:52:54,652 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 01:52:54,652 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 01:52:54,652 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 01:52:54,652 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 01:52:54,652 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 01:52:54,661 INFO L276 IsEmpty]: Start isEmpty. Operand has 38 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 13 states have call successors, (13), 4 states have call predecessors, (13), 4 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 01:52:54,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-06 01:52:54,664 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 01:52:54,665 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 01:52:54,665 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 01:52:54,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 01:52:54,668 INFO L82 PathProgramCache]: Analyzing trace with hash 223850557, now seen corresponding path program 1 times [2021-05-06 01:52:54,674 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 01:52:54,674 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1370025443] [2021-05-06 01:52:54,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 01:52:54,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:52:54,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 01:52:54,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:52:54,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 01:52:54,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:52:54,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-06 01:52:54,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:52:54,842 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 01:52:54,842 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 01:52:54,842 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1370025443] [2021-05-06 01:52:54,844 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1370025443] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 01:52:54,845 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 01:52:54,845 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 01:52:54,846 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [38773500] [2021-05-06 01:52:54,849 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 01:52:54,849 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 01:52:54,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 01:52:54,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 01:52:54,858 INFO L87 Difference]: Start difference. First operand has 38 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 13 states have call successors, (13), 4 states have call predecessors, (13), 4 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 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 01:52:55,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 01:52:55,503 INFO L93 Difference]: Finished difference Result 69 states and 113 transitions. [2021-05-06 01:52:55,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 01:52:55,505 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-05-06 01:52:55,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 01:52:55,509 INFO L225 Difference]: With dead ends: 69 [2021-05-06 01:52:55,509 INFO L226 Difference]: Without dead ends: 33 [2021-05-06 01:52:55,511 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 25.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 01:52:55,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-06 01:52:55,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-05-06 01:52:55,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 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) [2021-05-06 01:52:55,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 44 transitions. [2021-05-06 01:52:55,559 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 44 transitions. Word has length 23 [2021-05-06 01:52:55,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 01:52:55,559 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 44 transitions. [2021-05-06 01:52:55,559 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 01:52:55,560 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 44 transitions. [2021-05-06 01:52:55,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-06 01:52:55,560 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 01:52:55,561 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 01:52:55,561 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 01:52:55,561 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 01:52:55,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 01:52:55,562 INFO L82 PathProgramCache]: Analyzing trace with hash -563604624, now seen corresponding path program 1 times [2021-05-06 01:52:55,562 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 01:52:55,562 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [383397679] [2021-05-06 01:52:55,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 01:52:55,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:52:55,829 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 01:52:55,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:52:55,850 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 01:52:55,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:52:55,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-06 01:52:55,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:52:55,868 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 01:52:55,869 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 01:52:55,869 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [383397679] [2021-05-06 01:52:55,869 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [383397679] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 01:52:55,869 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 01:52:55,869 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 01:52:55,869 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241293714] [2021-05-06 01:52:55,870 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 01:52:55,870 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 01:52:55,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 01:52:55,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 01:52:55,872 INFO L87 Difference]: Start difference. First operand 33 states and 44 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3)