/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/ps2-ll_unwindbound1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 04:34:02,175 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 04:34:02,176 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 04:34:02,199 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 04:34:02,206 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 04:34:02,207 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 04:34:02,208 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 04:34:02,209 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 04:34:02,209 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 04:34:02,210 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 04:34:02,211 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 04:34:02,224 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 04:34:02,225 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 04:34:02,226 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 04:34:02,227 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 04:34:02,228 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 04:34:02,229 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 04:34:02,235 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 04:34:02,235 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 04:34:02,236 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 04:34:02,249 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 04:34:02,264 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 04:34:02,264 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 04:34:02,265 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-06 04:34:02,265 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-06 04:34:02,265 INFO L138 SettingsManager]: * Use SBE=true [2021-05-06 04:34:02,265 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 04:34:02,266 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 04:34:02,266 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 04:34:02,266 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 04:34:02,266 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 04:34:02,266 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 04:34:02,266 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 04:34:02,266 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 04:34:02,266 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 04:34:02,267 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 04:34:02,267 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 04:34:02,267 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 04:34:02,267 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 04:34:02,267 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 04:34:02,267 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 04:34:02,267 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 04:34:02,267 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 04:34:02,268 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-06 04:34:02,268 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-06 04:34:02,268 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 04:34:02,268 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-06 04:34:02,268 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 04:34:02,268 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-06 04:34:02,268 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 04:34:02,520 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 04:34:02,540 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 04:34:02,542 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 04:34:02,542 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 04:34:02,543 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 04:34:02,543 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/ps2-ll_unwindbound1.c [2021-05-06 04:34:02,592 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7b554169e/b62aae6d2e8e43828cfb1c540c30d76c/FLAG67eab07f9 [2021-05-06 04:34:02,952 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 04:34:02,952 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps2-ll_unwindbound1.c [2021-05-06 04:34:02,956 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7b554169e/b62aae6d2e8e43828cfb1c540c30d76c/FLAG67eab07f9 [2021-05-06 04:34:02,969 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7b554169e/b62aae6d2e8e43828cfb1c540c30d76c [2021-05-06 04:34:02,972 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 04:34:02,973 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 04:34:02,975 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 04:34:02,975 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 04:34:02,977 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 04:34:02,978 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 04:34:02" (1/1) ... [2021-05-06 04:34:02,978 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@46895e57 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:34:02, skipping insertion in model container [2021-05-06 04:34:02,978 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 04:34:02" (1/1) ... [2021-05-06 04:34:02,982 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 04:34:02,993 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 04:34:03,105 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/ps2-ll_unwindbound1.c[454,467] [2021-05-06 04:34:03,117 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 04:34:03,122 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 04:34:03,174 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/ps2-ll_unwindbound1.c[454,467] [2021-05-06 04:34:03,180 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 04:34:03,190 INFO L208 MainTranslator]: Completed translation [2021-05-06 04:34:03,190 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:34:03 WrapperNode [2021-05-06 04:34:03,190 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 04:34:03,192 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 04:34:03,192 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 04:34:03,193 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 04:34:03,200 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:34:03" (1/1) ... [2021-05-06 04:34:03,201 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:34:03" (1/1) ... [2021-05-06 04:34:03,205 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:34:03" (1/1) ... [2021-05-06 04:34:03,206 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:34:03" (1/1) ... [2021-05-06 04:34:03,215 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:34:03" (1/1) ... [2021-05-06 04:34:03,218 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:34:03" (1/1) ... [2021-05-06 04:34:03,219 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:34:03" (1/1) ... [2021-05-06 04:34:03,224 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 04:34:03,225 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 04:34:03,225 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 04:34:03,225 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 04:34:03,225 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:34:03" (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 04:34:03,283 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 04:34:03,283 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 04:34:03,283 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 04:34:03,284 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 04:34:03,284 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 04:34:03,284 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 04:34:03,285 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 04:34:03,285 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 04:34:03,285 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 04:34:03,285 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 04:34:03,285 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-06 04:34:03,286 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 04:34:03,286 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 04:34:03,286 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 04:34:03,287 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 04:34:03,287 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 04:34:03,287 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 04:34:03,287 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 04:34:03,287 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 04:34:03,287 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 04:34:03,474 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 04:34:03,474 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 04:34:03,475 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 04:34:03 BoogieIcfgContainer [2021-05-06 04:34:03,475 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 04:34:03,476 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 04:34:03,476 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 04:34:03,478 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 04:34:03,478 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 04:34:02" (1/3) ... [2021-05-06 04:34:03,479 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f0a5abf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 04:34:03, skipping insertion in model container [2021-05-06 04:34:03,479 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:34:03" (2/3) ... [2021-05-06 04:34:03,479 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f0a5abf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 04:34:03, skipping insertion in model container [2021-05-06 04:34:03,479 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 04:34:03" (3/3) ... [2021-05-06 04:34:03,480 INFO L111 eAbstractionObserver]: Analyzing ICFG ps2-ll_unwindbound1.c [2021-05-06 04:34:03,483 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-06 04:34:03,486 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 04:34:03,495 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 04:34:03,516 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 04:34:03,516 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 04:34:03,516 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-06 04:34:03,517 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 04:34:03,517 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 04:34:03,517 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 04:34:03,517 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 04:34:03,517 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 04:34:03,541 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 04:34:03,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 04:34:03,544 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:34:03,546 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:34:03,546 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:34:03,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:34:03,549 INFO L82 PathProgramCache]: Analyzing trace with hash 1665267581, now seen corresponding path program 1 times [2021-05-06 04:34:03,554 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:34:03,554 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2021270635] [2021-05-06 04:34:03,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:34:03,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:34:03,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 04:34:03,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:34:03,720 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:34:03,721 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:34:03,721 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2021270635] [2021-05-06 04:34:03,722 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2021270635] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 04:34:03,722 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 04:34:03,722 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 04:34:03,723 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046211692] [2021-05-06 04:34:03,726 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 04:34:03,726 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:34:03,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 04:34:03,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 04:34:03,738 INFO L87 Difference]: Start difference. First operand has 22 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) 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) [2021-05-06 04:34:03,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:34:03,792 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2021-05-06 04:34:03,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 04:34:03,794 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 [2021-05-06 04:34:03,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:34:03,798 INFO L225 Difference]: With dead ends: 39 [2021-05-06 04:34:03,798 INFO L226 Difference]: Without dead ends: 18 [2021-05-06 04:34:03,801 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 47.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 04:34:03,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-05-06 04:34:03,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2021-05-06 04:34:03,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 04:34:03,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-05-06 04:34:03,828 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 11 [2021-05-06 04:34:03,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:34:03,828 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-05-06 04:34:03,829 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) [2021-05-06 04:34:03,829 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-05-06 04:34:03,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 04:34:03,830 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:34:03,830 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:34:03,830 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 04:34:03,830 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:34:03,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:34:03,831 INFO L82 PathProgramCache]: Analyzing trace with hash -318583316, now seen corresponding path program 1 times [2021-05-06 04:34:03,831 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:34:03,831 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [192033081] [2021-05-06 04:34:03,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:34:03,861 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:34:03,861 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [154562846] [2021-05-06 04:34:03,862 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 [2021-05-06 04:34:03,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:34:03,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-06 04:34:03,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:34:03,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:34:03,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:34:04,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:34:04,024 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:34:04,030 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:34:04,052 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:34:04,052 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:34:04,052 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [192033081] [2021-05-06 04:34:04,053 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:34:04,053 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [154562846] [2021-05-06 04:34:04,053 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [154562846] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 04:34:04,054 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 04:34:04,054 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 04:34:04,054 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729458187] [2021-05-06 04:34:04,055 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 04:34:04,055 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:34:04,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 04:34:04,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 04:34:04,056 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 4 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) [2021-05-06 04:34:04,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:34:04,070 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2021-05-06 04:34:04,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 04:34:04,071 INFO L78 Accepts]: Start accepts. Automaton has has 4 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 [2021-05-06 04:34:04,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:34:04,072 INFO L225 Difference]: With dead ends: 26 [2021-05-06 04:34:04,072 INFO L226 Difference]: Without dead ends: 19 [2021-05-06 04:34:04,072 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.6ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 04:34:04,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-06 04:34:04,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-06 04:34:04,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 04:34:04,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2021-05-06 04:34:04,082 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 12 [2021-05-06 04:34:04,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:34:04,083 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2021-05-06 04:34:04,084 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 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) [2021-05-06 04:34:04,084 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2021-05-06 04:34:04,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 04:34:04,084 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:34:04,085 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:34:04,302 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-06 04:34:04,305 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:34:04,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:34:04,306 INFO L82 PathProgramCache]: Analyzing trace with hash -316795856, now seen corresponding path program 1 times [2021-05-06 04:34:04,306 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:34:04,306 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1072482229] [2021-05-06 04:34:04,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:34:04,322 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:34:04,322 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1467532534] [2021-05-06 04:34:04,322 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 [2021-05-06 04:34:04,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:34:04,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 04:34:04,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:34:04,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:34:04,450 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:34:04,451 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:34:04,451 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1072482229] [2021-05-06 04:34:04,451 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:34:04,451 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1467532534] [2021-05-06 04:34:04,451 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1467532534] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 04:34:04,451 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 04:34:04,451 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 04:34:04,451 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075642580] [2021-05-06 04:34:04,452 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 04:34:04,452 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:34:04,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 04:34:04,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 04:34:04,453 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 04:34:04,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:34:04,483 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2021-05-06 04:34:04,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 04:34:04,484 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-06 04:34:04,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:34:04,484 INFO L225 Difference]: With dead ends: 28 [2021-05-06 04:34:04,485 INFO L226 Difference]: Without dead ends: 25 [2021-05-06 04:34:04,485 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 19.3ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 04:34:04,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-06 04:34:04,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-05-06 04:34:04,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 16 states have (on average 1.1875) internal successors, (19), 17 states have internal predecessors, (19), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 04:34:04,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2021-05-06 04:34:04,495 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 12 [2021-05-06 04:34:04,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:34:04,495 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2021-05-06 04:34:04,495 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 04:34:04,495 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2021-05-06 04:34:04,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-06 04:34:04,497 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:34:04,497 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:34:04,701 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:34:04,702 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:34:04,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:34:04,702 INFO L82 PathProgramCache]: Analyzing trace with hash -2089867248, now seen corresponding path program 1 times [2021-05-06 04:34:04,702 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:34:04,702 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249420830] [2021-05-06 04:34:04,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:34:04,717 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:34:04,717 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1595788490] [2021-05-06 04:34:04,718 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 [2021-05-06 04:34:04,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:34:04,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 04:34:04,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:34:04,846 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:34:04,854 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:34:04,855 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:34:04,855 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249420830] [2021-05-06 04:34:04,855 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:34:04,855 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1595788490] [2021-05-06 04:34:04,855 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1595788490] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:34:04,855 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:34:04,855 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 04:34:04,855 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159730434] [2021-05-06 04:34:04,855 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 04:34:04,855 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:34:04,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 04:34:04,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 04:34:04,856 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 04:34:04,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:34:04,887 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2021-05-06 04:34:04,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 04:34:04,887 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-05-06 04:34:04,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:34:04,888 INFO L225 Difference]: With dead ends: 36 [2021-05-06 04:34:04,888 INFO L226 Difference]: Without dead ends: 33 [2021-05-06 04:34:04,888 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 22.0ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 04:34:04,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-06 04:34:04,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-05-06 04:34:04,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 23 states have internal predecessors, (25), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 04:34:04,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2021-05-06 04:34:04,892 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 20 [2021-05-06 04:34:04,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:34:04,892 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2021-05-06 04:34:04,892 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 04:34:04,892 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2021-05-06 04:34:04,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-06 04:34:04,892 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:34:04,892 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:34:05,108 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:34:05,109 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:34:05,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:34:05,109 INFO L82 PathProgramCache]: Analyzing trace with hash -696181196, now seen corresponding path program 2 times [2021-05-06 04:34:05,109 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:34:05,110 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [407249444] [2021-05-06 04:34:05,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:34:05,116 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:34:05,116 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [250764487] [2021-05-06 04:34:05,116 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 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 [2021-05-06 04:34:05,169 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 04:34:05,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:34:05,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 04:34:05,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:34:05,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:34:05,189 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:34:05,190 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:34:05,196 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:34:05,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:34:05,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:34:05,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:34:05,216 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:34:05,233 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 13 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-06 04:34:05,233 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:34:05,233 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [407249444] [2021-05-06 04:34:05,233 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:34:05,233 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [250764487] [2021-05-06 04:34:05,233 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [250764487] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:34:05,234 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:34:05,234 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-06 04:34:05,234 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [50235118] [2021-05-06 04:34:05,234 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 04:34:05,234 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:34:05,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 04:34:05,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 04:34:05,235 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 4 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 04:34:05,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:34:05,250 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2021-05-06 04:34:05,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 04:34:05,250 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 4 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 28 [2021-05-06 04:34:05,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:34:05,251 INFO L225 Difference]: With dead ends: 33 [2021-05-06 04:34:05,251 INFO L226 Difference]: Without dead ends: 0 [2021-05-06 04:34:05,251 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 11.1ms TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-05-06 04:34:05,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-06 04:34:05,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-06 04:34:05,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-06 04:34:05,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-06 04:34:05,252 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 28 [2021-05-06 04:34:05,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:34:05,252 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-06 04:34:05,252 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 4 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 04:34:05,252 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-06 04:34:05,252 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-06 04:34:05,468 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:34:05,470 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-05-06 04:34:05,579 INFO L198 CegarLoopUtils]: For program point reach_errorEXIT(line 3) no Hoare annotation was computed. [2021-05-06 04:34:05,579 INFO L198 CegarLoopUtils]: For program point reach_errorENTRY(line 3) no Hoare annotation was computed. [2021-05-06 04:34:05,579 INFO L198 CegarLoopUtils]: For program point reach_errorFINAL(line 3) no Hoare annotation was computed. [2021-05-06 04:34:05,579 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2021-05-06 04:34:05,580 INFO L194 CegarLoopUtils]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#t~string5.base| |old(#t~string5.base)|) (= |#t~string5.offset| |old(#t~string5.offset)|) (= |old(#length)| |#length|) (= |#t~string6.base| |old(#t~string6.base)|) (= |#t~string6.offset| |old(#t~string6.offset)|) (= |#t~string4.base| |old(#t~string4.base)|) (= |#NULL.base| |old(#NULL.base)|) (= ~counter~0 |old(~counter~0)|) (= |#t~string4.offset| |old(#t~string4.offset)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|)) [2021-05-06 04:34:05,580 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2021-05-06 04:34:05,580 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-05-06 04:34:05,580 INFO L194 CegarLoopUtils]: At program point L-1(line -1) the Hoare annotation is: (and (<= ~counter~0 0) (<= 0 ~counter~0)) [2021-05-06 04:34:05,580 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2021-05-06 04:34:05,580 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2021-05-06 04:34:05,580 INFO L198 CegarLoopUtils]: For program point assume_abort_if_notENTRY(lines 6 8) no Hoare annotation was computed. [2021-05-06 04:34:05,580 INFO L198 CegarLoopUtils]: For program point L7(line 7) no Hoare annotation was computed. [2021-05-06 04:34:05,580 INFO L198 CegarLoopUtils]: For program point L7-2(lines 6 8) no Hoare annotation was computed. [2021-05-06 04:34:05,580 INFO L198 CegarLoopUtils]: For program point assume_abort_if_notEXIT(lines 6 8) no Hoare annotation was computed. [2021-05-06 04:34:05,580 INFO L194 CegarLoopUtils]: At program point mainENTRY(lines 18 40) the Hoare annotation is: (or (not (<= |old(~counter~0)| 0)) (not (<= 0 |old(~counter~0)|)) (= ~counter~0 |old(~counter~0)|)) [2021-05-06 04:34:05,580 INFO L194 CegarLoopUtils]: At program point L28(line 28) the Hoare annotation is: (or (not (<= |old(~counter~0)| 0)) (and (<= 1 ~counter~0) (= main_~y~0 0) (= main_~x~0 0)) (not (<= 0 |old(~counter~0)|))) [2021-05-06 04:34:05,580 INFO L198 CegarLoopUtils]: For program point L28-1(lines 27 36) no Hoare annotation was computed. [2021-05-06 04:34:05,580 INFO L198 CegarLoopUtils]: For program point L27-1(lines 27 36) no Hoare annotation was computed. [2021-05-06 04:34:05,580 INFO L198 CegarLoopUtils]: For program point mainEXIT(lines 18 40) no Hoare annotation was computed. [2021-05-06 04:34:05,580 INFO L194 CegarLoopUtils]: At program point L27-3(lines 27 36) the Hoare annotation is: (or (not (<= |old(~counter~0)| 0)) (and (= main_~y~0 0) (<= ~counter~0 0) (= main_~x~0 0) (<= 0 ~counter~0)) (not (<= 0 |old(~counter~0)|)) (and (<= 1 ~counter~0) (= main_~y~0 1) (= main_~y~0 main_~x~0))) [2021-05-06 04:34:05,581 INFO L194 CegarLoopUtils]: At program point L27-4(lines 27 36) the Hoare annotation is: (or (not (<= |old(~counter~0)| 0)) (and (= main_~y~0 1) (= main_~y~0 main_~x~0)) (and (= main_~y~0 0) (= main_~x~0 0)) (not (<= 0 |old(~counter~0)|))) [2021-05-06 04:34:05,581 INFO L198 CegarLoopUtils]: For program point mainFINAL(lines 18 40) no Hoare annotation was computed. [2021-05-06 04:34:05,581 INFO L198 CegarLoopUtils]: For program point L37(line 37) no Hoare annotation was computed. [2021-05-06 04:34:05,581 INFO L201 CegarLoopUtils]: At program point __VERIFIER_assertENTRY(lines 9 15) the Hoare annotation is: true [2021-05-06 04:34:05,581 INFO L198 CegarLoopUtils]: For program point L11(lines 11 12) no Hoare annotation was computed. [2021-05-06 04:34:05,581 INFO L198 CegarLoopUtils]: For program point L10(lines 10 13) no Hoare annotation was computed. [2021-05-06 04:34:05,581 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertEXIT(lines 9 15) no Hoare annotation was computed. [2021-05-06 04:34:05,581 INFO L198 CegarLoopUtils]: For program point L10-2(lines 9 15) no Hoare annotation was computed. [2021-05-06 04:34:05,581 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 12) no Hoare annotation was computed. [2021-05-06 04:34:05,592 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 04:34:05 BoogieIcfgContainer [2021-05-06 04:34:05,592 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-06 04:34:05,593 INFO L168 Benchmark]: Toolchain (without parser) took 2619.69 ms. Allocated memory is still 186.6 MB. Free memory was 150.6 MB in the beginning and 101.9 MB in the end (delta: 48.8 MB). Peak memory consumption was 50.3 MB. Max. memory is 8.0 GB. [2021-05-06 04:34:05,593 INFO L168 Benchmark]: CDTParser took 0.10 ms. Allocated memory is still 186.6 MB. Free memory is still 166.9 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-06 04:34:05,593 INFO L168 Benchmark]: CACSL2BoogieTranslator took 216.07 ms. Allocated memory is still 186.6 MB. Free memory was 150.4 MB in the beginning and 169.2 MB in the end (delta: -18.7 MB). Peak memory consumption was 11.8 MB. Max. memory is 8.0 GB. [2021-05-06 04:34:05,593 INFO L168 Benchmark]: Boogie Preprocessor took 31.58 ms. Allocated memory is still 186.6 MB. Free memory was 169.2 MB in the beginning and 167.6 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-06 04:34:05,593 INFO L168 Benchmark]: RCFGBuilder took 250.89 ms. Allocated memory is still 186.6 MB. Free memory was 167.6 MB in the beginning and 153.5 MB in the end (delta: 14.2 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2021-05-06 04:34:05,595 INFO L168 Benchmark]: TraceAbstraction took 2116.02 ms. Allocated memory is still 186.6 MB. Free memory was 152.9 MB in the beginning and 101.9 MB in the end (delta: 51.1 MB). Peak memory consumption was 51.1 MB. Max. memory is 8.0 GB. [2021-05-06 04:34:05,596 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10 ms. Allocated memory is still 186.6 MB. Free memory is still 166.9 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 216.07 ms. Allocated memory is still 186.6 MB. Free memory was 150.4 MB in the beginning and 169.2 MB in the end (delta: -18.7 MB). Peak memory consumption was 11.8 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 31.58 ms. Allocated memory is still 186.6 MB. Free memory was 169.2 MB in the beginning and 167.6 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 250.89 ms. Allocated memory is still 186.6 MB. Free memory was 167.6 MB in the beginning and 153.5 MB in the end (delta: 14.2 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 2116.02 ms. Allocated memory is still 186.6 MB. Free memory was 152.9 MB in the beginning and 101.9 MB in the end (delta: 51.1 MB). Peak memory consumption was 51.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 12]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 29 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 1954.3ms, OverallIterations: 5, TraceHistogramMax: 3, EmptinessCheckTime: 23.3ms, AutomataDifference: 173.2ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 109.6ms, InitialAbstractionConstructionTime: 7.1ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 87 SDtfs, 24 SDslu, 159 SDs, 0 SdLazy, 73 SolverSat, 9 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 66.1ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 75 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 106.2ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=33occurred in iteration=4, InterpolantAutomatonStates: 23, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 40.4ms AutomataMinimizationTime, 5 MinimizatonAttempts, 1 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: 0.0ms HoareAnnotationTime, 8 LocationsWithAnnotation, 16 PreInvPairs, 21 NumberOfFragments, 129 HoareAnnotationTreeSize, 16 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 22.9ms HoareSimplificationTime, 8 FomulaSimplificationsInter, 128 FormulaSimplificationTreeSizeReductionInter, 80.2ms HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 39.9ms SsaConstructionTime, 107.3ms SatisfiabilityAnalysisTime, 441.4ms InterpolantComputationTime, 83 NumberOfCodeBlocks, 83 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 78 ConstructedInterpolants, 0 QuantifiedInterpolants, 219 SizeOfPredicates, 5 NumberOfNonLiveVariables, 483 ConjunctsInSsa, 30 ConjunctsInUnsatCore, 5 InterpolantComputations, 3 PerfectInterpolantSequences, 17/20 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 - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 27]: Loop Invariant Derived loop invariant: ((!(\old(counter) <= 0) || (((y == 0 && counter <= 0) && x == 0) && 0 <= counter)) || !(0 <= \old(counter))) || ((1 <= counter && y == 1) && y == x) RESULT: Ultimate proved your program to be correct! Received shutdown request...