./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/nla-digbench-scaling/hard-ll_unwindbound50.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 791161d1 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/nla-digbench-scaling/hard-ll_unwindbound50.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash aefc568e9b7c922872a103ac050823e614044aea4bac2f22f2c586f3247176b4 --- Real Ultimate output --- This is Ultimate 0.2.2-?-791161d [2022-07-22 16:15:21,159 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-22 16:15:21,161 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-22 16:15:21,199 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-22 16:15:21,199 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-22 16:15:21,201 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-22 16:15:21,203 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-22 16:15:21,208 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-22 16:15:21,210 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-22 16:15:21,212 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-22 16:15:21,213 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-22 16:15:21,214 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-22 16:15:21,214 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-22 16:15:21,215 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-22 16:15:21,221 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-22 16:15:21,224 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-22 16:15:21,225 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-22 16:15:21,226 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-22 16:15:21,228 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-22 16:15:21,230 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-22 16:15:21,233 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-22 16:15:21,233 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-22 16:15:21,234 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-22 16:15:21,235 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-22 16:15:21,237 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-22 16:15:21,244 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-22 16:15:21,245 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-22 16:15:21,246 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-22 16:15:21,247 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-22 16:15:21,248 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-22 16:15:21,249 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-22 16:15:21,249 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-22 16:15:21,251 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-22 16:15:21,251 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-22 16:15:21,252 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-22 16:15:21,253 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-22 16:15:21,253 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-22 16:15:21,254 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-22 16:15:21,254 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-22 16:15:21,255 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-22 16:15:21,256 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-22 16:15:21,257 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-22 16:15:21,259 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2022-07-22 16:15:21,292 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-22 16:15:21,293 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-22 16:15:21,293 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-22 16:15:21,293 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-22 16:15:21,294 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-22 16:15:21,294 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-22 16:15:21,294 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-22 16:15:21,295 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-22 16:15:21,295 INFO L138 SettingsManager]: * Use SBE=true [2022-07-22 16:15:21,295 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-22 16:15:21,295 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-22 16:15:21,295 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-22 16:15:21,296 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-22 16:15:21,296 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-22 16:15:21,296 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-07-22 16:15:21,296 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-22 16:15:21,296 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-07-22 16:15:21,297 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-22 16:15:21,297 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-07-22 16:15:21,297 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-22 16:15:21,297 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-07-22 16:15:21,297 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-22 16:15:21,298 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-22 16:15:21,298 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-22 16:15:21,298 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-22 16:15:21,298 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-22 16:15:21,298 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-22 16:15:21,306 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-07-22 16:15:21,307 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-07-22 16:15:21,307 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-07-22 16:15:21,307 INFO L138 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2022-07-22 16:15:21,307 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-07-22 16:15:21,307 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-07-22 16:15:21,307 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> aefc568e9b7c922872a103ac050823e614044aea4bac2f22f2c586f3247176b4 [2022-07-22 16:15:21,563 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-22 16:15:21,594 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-22 16:15:21,596 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-22 16:15:21,599 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-22 16:15:21,600 INFO L275 PluginConnector]: CDTParser initialized [2022-07-22 16:15:21,601 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/nla-digbench-scaling/hard-ll_unwindbound50.c [2022-07-22 16:15:21,667 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ba2287ccf/d368e798e55345f4ac4332e75df3c28d/FLAG92e0beba8 [2022-07-22 16:15:22,124 INFO L306 CDTParser]: Found 1 translation units. [2022-07-22 16:15:22,125 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/hard-ll_unwindbound50.c [2022-07-22 16:15:22,132 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ba2287ccf/d368e798e55345f4ac4332e75df3c28d/FLAG92e0beba8 [2022-07-22 16:15:22,150 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ba2287ccf/d368e798e55345f4ac4332e75df3c28d [2022-07-22 16:15:22,153 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-22 16:15:22,155 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-22 16:15:22,157 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-22 16:15:22,157 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-22 16:15:22,160 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-22 16:15:22,161 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.07 04:15:22" (1/1) ... [2022-07-22 16:15:22,162 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@628a5a3f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 04:15:22, skipping insertion in model container [2022-07-22 16:15:22,162 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.07 04:15:22" (1/1) ... [2022-07-22 16:15:22,168 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-22 16:15:22,182 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-22 16:15:22,331 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/hard-ll_unwindbound50.c[538,551] [2022-07-22 16:15:22,359 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-22 16:15:22,367 INFO L203 MainTranslator]: Completed pre-run [2022-07-22 16:15:22,380 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/hard-ll_unwindbound50.c[538,551] [2022-07-22 16:15:22,391 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-22 16:15:22,406 INFO L208 MainTranslator]: Completed translation [2022-07-22 16:15:22,407 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 04:15:22 WrapperNode [2022-07-22 16:15:22,407 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-22 16:15:22,408 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-07-22 16:15:22,409 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-07-22 16:15:22,409 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-07-22 16:15:22,416 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 04:15:22" (1/1) ... [2022-07-22 16:15:22,422 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 04:15:22" (1/1) ... [2022-07-22 16:15:22,442 INFO L137 Inliner]: procedures = 14, calls = 15, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 65 [2022-07-22 16:15:22,443 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-07-22 16:15:22,444 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-07-22 16:15:22,445 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-07-22 16:15:22,445 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-07-22 16:15:22,452 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 04:15:22" (1/1) ... [2022-07-22 16:15:22,452 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 04:15:22" (1/1) ... [2022-07-22 16:15:22,462 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 04:15:22" (1/1) ... [2022-07-22 16:15:22,462 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 04:15:22" (1/1) ... [2022-07-22 16:15:22,470 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 04:15:22" (1/1) ... [2022-07-22 16:15:22,476 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 04:15:22" (1/1) ... [2022-07-22 16:15:22,479 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 04:15:22" (1/1) ... [2022-07-22 16:15:22,484 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-07-22 16:15:22,486 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-07-22 16:15:22,486 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-07-22 16:15:22,486 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-07-22 16:15:22,487 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 04:15:22" (1/1) ... [2022-07-22 16:15:22,494 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-22 16:15:22,505 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-22 16:15:22,525 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-07-22 16:15:22,557 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-07-22 16:15:22,581 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-07-22 16:15:22,581 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-07-22 16:15:22,581 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-07-22 16:15:22,581 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-07-22 16:15:22,582 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-07-22 16:15:22,582 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-07-22 16:15:22,647 INFO L234 CfgBuilder]: Building ICFG [2022-07-22 16:15:22,649 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-07-22 16:15:22,799 INFO L275 CfgBuilder]: Performing block encoding [2022-07-22 16:15:22,807 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-07-22 16:15:22,807 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-07-22 16:15:22,809 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.07 04:15:22 BoogieIcfgContainer [2022-07-22 16:15:22,809 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-07-22 16:15:22,813 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-07-22 16:15:22,813 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-07-22 16:15:22,817 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-07-22 16:15:22,818 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.07 04:15:22" (1/3) ... [2022-07-22 16:15:22,819 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b720716 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.07 04:15:22, skipping insertion in model container [2022-07-22 16:15:22,819 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 04:15:22" (2/3) ... [2022-07-22 16:15:22,819 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b720716 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.07 04:15:22, skipping insertion in model container [2022-07-22 16:15:22,819 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.07 04:15:22" (3/3) ... [2022-07-22 16:15:22,821 INFO L111 eAbstractionObserver]: Analyzing ICFG hard-ll_unwindbound50.c [2022-07-22 16:15:22,837 INFO L201 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-07-22 16:15:22,837 INFO L160 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-07-22 16:15:22,895 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-22 16:15:22,904 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@4e5e132a, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@7c3a72c8 [2022-07-22 16:15:22,904 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-07-22 16:15:22,909 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 19 states have internal predecessors, (28), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-07-22 16:15:22,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-07-22 16:15:22,918 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 16:15:22,918 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 16:15:22,919 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 16:15:22,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 16:15:22,926 INFO L85 PathProgramCache]: Analyzing trace with hash -712527539, now seen corresponding path program 1 times [2022-07-22 16:15:22,934 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 16:15:22,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [304580732] [2022-07-22 16:15:22,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 16:15:22,937 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 16:15:23,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 16:15:23,093 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-22 16:15:23,093 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 16:15:23,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [304580732] [2022-07-22 16:15:23,094 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [304580732] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-22 16:15:23,095 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-22 16:15:23,095 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-22 16:15:23,096 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361938400] [2022-07-22 16:15:23,097 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-22 16:15:23,101 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-07-22 16:15:23,102 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 16:15:23,135 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-07-22 16:15:23,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-07-22 16:15:23,139 INFO L87 Difference]: Start difference. First operand has 28 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 19 states have internal predecessors, (28), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 16:15:23,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 16:15:23,162 INFO L93 Difference]: Finished difference Result 53 states and 87 transitions. [2022-07-22 16:15:23,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-07-22 16:15:23,165 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-07-22 16:15:23,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-22 16:15:23,173 INFO L225 Difference]: With dead ends: 53 [2022-07-22 16:15:23,173 INFO L226 Difference]: Without dead ends: 24 [2022-07-22 16:15:23,177 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-07-22 16:15:23,181 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-22 16:15:23,182 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-22 16:15:23,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-07-22 16:15:23,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-07-22 16:15:23,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 15 states have (on average 1.4) internal successors, (21), 16 states have internal predecessors, (21), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-07-22 16:15:23,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 34 transitions. [2022-07-22 16:15:23,225 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 34 transitions. Word has length 10 [2022-07-22 16:15:23,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-22 16:15:23,226 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 34 transitions. [2022-07-22 16:15:23,226 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 16:15:23,226 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 34 transitions. [2022-07-22 16:15:23,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-07-22 16:15:23,227 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 16:15:23,227 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 16:15:23,227 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-07-22 16:15:23,228 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 16:15:23,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 16:15:23,229 INFO L85 PathProgramCache]: Analyzing trace with hash -1983932575, now seen corresponding path program 1 times [2022-07-22 16:15:23,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 16:15:23,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [278228205] [2022-07-22 16:15:23,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 16:15:23,230 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 16:15:23,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 16:15:23,338 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-22 16:15:23,339 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 16:15:23,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [278228205] [2022-07-22 16:15:23,339 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [278228205] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-22 16:15:23,340 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-22 16:15:23,340 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-07-22 16:15:23,340 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [335278887] [2022-07-22 16:15:23,340 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-22 16:15:23,341 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-07-22 16:15:23,342 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 16:15:23,342 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-07-22 16:15:23,343 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-07-22 16:15:23,343 INFO L87 Difference]: Start difference. First operand 24 states and 34 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 16:15:23,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 16:15:23,401 INFO L93 Difference]: Finished difference Result 38 states and 53 transitions. [2022-07-22 16:15:23,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-22 16:15:23,402 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-07-22 16:15:23,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-22 16:15:23,403 INFO L225 Difference]: With dead ends: 38 [2022-07-22 16:15:23,403 INFO L226 Difference]: Without dead ends: 36 [2022-07-22 16:15:23,404 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-07-22 16:15:23,410 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 15 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-22 16:15:23,411 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 106 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-22 16:15:23,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-07-22 16:15:23,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 28. [2022-07-22 16:15:23,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-07-22 16:15:23,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 37 transitions. [2022-07-22 16:15:23,433 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 37 transitions. Word has length 10 [2022-07-22 16:15:23,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-22 16:15:23,433 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 37 transitions. [2022-07-22 16:15:23,434 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 16:15:23,434 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 37 transitions. [2022-07-22 16:15:23,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-07-22 16:15:23,435 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 16:15:23,435 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 16:15:23,435 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-07-22 16:15:23,435 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 16:15:23,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 16:15:23,436 INFO L85 PathProgramCache]: Analyzing trace with hash 1787143384, now seen corresponding path program 1 times [2022-07-22 16:15:23,436 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 16:15:23,436 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1637176718] [2022-07-22 16:15:23,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 16:15:23,437 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 16:15:23,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 16:15:23,497 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-22 16:15:23,497 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 16:15:23,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1637176718] [2022-07-22 16:15:23,498 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1637176718] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-22 16:15:23,498 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-22 16:15:23,498 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-07-22 16:15:23,499 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321382701] [2022-07-22 16:15:23,499 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-22 16:15:23,499 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-07-22 16:15:23,499 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 16:15:23,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-07-22 16:15:23,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-22 16:15:23,516 INFO L87 Difference]: Start difference. First operand 28 states and 37 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 16:15:23,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 16:15:23,533 INFO L93 Difference]: Finished difference Result 44 states and 59 transitions. [2022-07-22 16:15:23,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-07-22 16:15:23,534 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-07-22 16:15:23,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-22 16:15:23,535 INFO L225 Difference]: With dead ends: 44 [2022-07-22 16:15:23,535 INFO L226 Difference]: Without dead ends: 30 [2022-07-22 16:15:23,536 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-07-22 16:15:23,537 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 0 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-22 16:15:23,538 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 89 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-22 16:15:23,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-07-22 16:15:23,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-07-22 16:15:23,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 20 states have (on average 1.3) internal successors, (26), 21 states have internal predecessors, (26), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-07-22 16:15:23,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2022-07-22 16:15:23,545 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 12 [2022-07-22 16:15:23,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-22 16:15:23,545 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2022-07-22 16:15:23,545 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-07-22 16:15:23,546 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2022-07-22 16:15:23,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-07-22 16:15:23,546 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 16:15:23,547 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 16:15:23,547 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-07-22 16:15:23,547 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 16:15:23,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 16:15:23,548 INFO L85 PathProgramCache]: Analyzing trace with hash 472519838, now seen corresponding path program 1 times [2022-07-22 16:15:23,548 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 16:15:23,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [577213582] [2022-07-22 16:15:23,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 16:15:23,549 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 16:15:23,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 16:15:23,657 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-07-22 16:15:23,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 16:15:23,666 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-22 16:15:23,667 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 16:15:23,667 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [577213582] [2022-07-22 16:15:23,667 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [577213582] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-22 16:15:23,667 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-22 16:15:23,668 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-07-22 16:15:23,668 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947725716] [2022-07-22 16:15:23,668 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-22 16:15:23,669 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-07-22 16:15:23,669 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 16:15:23,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-07-22 16:15:23,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-07-22 16:15:23,670 INFO L87 Difference]: Start difference. First operand 30 states and 39 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-22 16:15:23,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 16:15:23,741 INFO L93 Difference]: Finished difference Result 44 states and 58 transitions. [2022-07-22 16:15:23,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-07-22 16:15:23,742 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-07-22 16:15:23,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-22 16:15:23,743 INFO L225 Difference]: With dead ends: 44 [2022-07-22 16:15:23,744 INFO L226 Difference]: Without dead ends: 42 [2022-07-22 16:15:23,744 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-07-22 16:15:23,745 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 13 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-22 16:15:23,746 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 102 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-22 16:15:23,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-07-22 16:15:23,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 34. [2022-07-22 16:15:23,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 24 states have internal predecessors, (29), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-07-22 16:15:23,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2022-07-22 16:15:23,755 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 15 [2022-07-22 16:15:23,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-22 16:15:23,756 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2022-07-22 16:15:23,756 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-22 16:15:23,756 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2022-07-22 16:15:23,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-07-22 16:15:23,757 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 16:15:23,757 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 16:15:23,757 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-07-22 16:15:23,758 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 16:15:23,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 16:15:23,758 INFO L85 PathProgramCache]: Analyzing trace with hash 838495553, now seen corresponding path program 1 times [2022-07-22 16:15:23,758 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 16:15:23,759 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [919573685] [2022-07-22 16:15:23,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 16:15:23,759 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 16:15:23,772 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-22 16:15:23,772 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2062155587] [2022-07-22 16:15:23,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 16:15:23,773 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 16:15:23,773 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-22 16:15:23,775 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-22 16:15:23,780 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-07-22 16:15:23,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 16:15:23,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 21 conjunts are in the unsatisfiable core [2022-07-22 16:15:23,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-22 16:15:24,215 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-22 16:15:24,216 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-22 16:15:24,417 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-07-22 16:15:24,418 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 16:15:24,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [919573685] [2022-07-22 16:15:24,418 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-22 16:15:24,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2062155587] [2022-07-22 16:15:24,419 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2062155587] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-22 16:15:24,419 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-22 16:15:24,419 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 13 [2022-07-22 16:15:24,420 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462765056] [2022-07-22 16:15:24,420 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-22 16:15:24,420 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-07-22 16:15:24,421 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 16:15:24,421 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-07-22 16:15:24,422 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2022-07-22 16:15:24,422 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand has 13 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 4 states have call successors, (4) [2022-07-22 16:15:24,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 16:15:24,965 INFO L93 Difference]: Finished difference Result 75 states and 101 transitions. [2022-07-22 16:15:24,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-07-22 16:15:24,968 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 4 states have call successors, (4) Word has length 20 [2022-07-22 16:15:24,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-22 16:15:24,971 INFO L225 Difference]: With dead ends: 75 [2022-07-22 16:15:24,971 INFO L226 Difference]: Without dead ends: 59 [2022-07-22 16:15:24,972 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=263, Unknown=0, NotChecked=0, Total=342 [2022-07-22 16:15:24,973 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 72 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 284 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-07-22 16:15:24,974 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 98 Invalid, 284 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 215 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-07-22 16:15:24,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-07-22 16:15:24,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2022-07-22 16:15:24,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 35 states have (on average 1.2571428571428571) internal successors, (44), 38 states have internal predecessors, (44), 15 states have call successors, (15), 5 states have call predecessors, (15), 5 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2022-07-22 16:15:24,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 72 transitions. [2022-07-22 16:15:24,993 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 72 transitions. Word has length 20 [2022-07-22 16:15:24,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-22 16:15:24,993 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 72 transitions. [2022-07-22 16:15:24,993 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 4 states have call successors, (4) [2022-07-22 16:15:24,993 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 72 transitions. [2022-07-22 16:15:24,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-07-22 16:15:24,994 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 16:15:24,994 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 16:15:25,019 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-07-22 16:15:25,195 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 16:15:25,195 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 16:15:25,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 16:15:25,196 INFO L85 PathProgramCache]: Analyzing trace with hash 414140572, now seen corresponding path program 1 times [2022-07-22 16:15:25,196 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 16:15:25,197 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1846960926] [2022-07-22 16:15:25,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 16:15:25,197 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 16:15:25,208 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-22 16:15:25,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [812509936] [2022-07-22 16:15:25,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 16:15:25,217 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 16:15:25,217 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-22 16:15:25,219 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-22 16:15:25,220 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-07-22 16:15:25,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 16:15:25,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 5 conjunts are in the unsatisfiable core [2022-07-22 16:15:25,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-22 16:15:25,332 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-07-22 16:15:25,332 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-22 16:15:25,333 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 16:15:25,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1846960926] [2022-07-22 16:15:25,333 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-22 16:15:25,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [812509936] [2022-07-22 16:15:25,334 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [812509936] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-22 16:15:25,334 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-22 16:15:25,334 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-07-22 16:15:25,334 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490948579] [2022-07-22 16:15:25,334 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-22 16:15:25,335 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-07-22 16:15:25,335 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 16:15:25,343 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-07-22 16:15:25,343 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-07-22 16:15:25,344 INFO L87 Difference]: Start difference. First operand 56 states and 72 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-07-22 16:15:25,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 16:15:25,384 INFO L93 Difference]: Finished difference Result 72 states and 85 transitions. [2022-07-22 16:15:25,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-07-22 16:15:25,388 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 28 [2022-07-22 16:15:25,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-22 16:15:25,390 INFO L225 Difference]: With dead ends: 72 [2022-07-22 16:15:25,390 INFO L226 Difference]: Without dead ends: 65 [2022-07-22 16:15:25,391 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-07-22 16:15:25,392 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 4 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-22 16:15:25,394 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 117 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-22 16:15:25,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-07-22 16:15:25,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2022-07-22 16:15:25,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 41 states have (on average 1.1951219512195121) internal successors, (49), 44 states have internal predecessors, (49), 15 states have call successors, (15), 7 states have call predecessors, (15), 7 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2022-07-22 16:15:25,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 77 transitions. [2022-07-22 16:15:25,425 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 77 transitions. Word has length 28 [2022-07-22 16:15:25,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-22 16:15:25,426 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 77 transitions. [2022-07-22 16:15:25,426 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-07-22 16:15:25,427 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 77 transitions. [2022-07-22 16:15:25,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-07-22 16:15:25,427 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 16:15:25,428 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 16:15:25,446 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-07-22 16:15:25,628 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-07-22 16:15:25,629 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 16:15:25,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 16:15:25,629 INFO L85 PathProgramCache]: Analyzing trace with hash 415868450, now seen corresponding path program 1 times [2022-07-22 16:15:25,630 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 16:15:25,630 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1883625128] [2022-07-22 16:15:25,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 16:15:25,630 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 16:15:25,645 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-22 16:15:25,645 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2087918044] [2022-07-22 16:15:25,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 16:15:25,646 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 16:15:25,646 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-22 16:15:25,649 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-22 16:15:25,651 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-07-22 16:15:25,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 16:15:25,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 7 conjunts are in the unsatisfiable core [2022-07-22 16:15:25,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-22 16:15:25,761 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-07-22 16:15:25,761 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-07-22 16:15:25,762 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 16:15:25,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1883625128] [2022-07-22 16:15:25,762 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-22 16:15:25,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2087918044] [2022-07-22 16:15:25,762 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2087918044] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-22 16:15:25,763 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-22 16:15:25,763 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-07-22 16:15:25,763 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923222911] [2022-07-22 16:15:25,763 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-22 16:15:25,764 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-07-22 16:15:25,764 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 16:15:25,764 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-07-22 16:15:25,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-07-22 16:15:25,765 INFO L87 Difference]: Start difference. First operand 64 states and 77 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-07-22 16:15:25,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 16:15:25,873 INFO L93 Difference]: Finished difference Result 79 states and 97 transitions. [2022-07-22 16:15:25,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-07-22 16:15:25,874 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 28 [2022-07-22 16:15:25,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-22 16:15:25,875 INFO L225 Difference]: With dead ends: 79 [2022-07-22 16:15:25,875 INFO L226 Difference]: Without dead ends: 71 [2022-07-22 16:15:25,875 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-07-22 16:15:25,876 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 11 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-22 16:15:25,876 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 86 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-22 16:15:25,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-07-22 16:15:25,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2022-07-22 16:15:25,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 45 states have (on average 1.2) internal successors, (54), 49 states have internal predecessors, (54), 16 states have call successors, (16), 8 states have call predecessors, (16), 8 states have return successors, (14), 12 states have call predecessors, (14), 14 states have call successors, (14) [2022-07-22 16:15:25,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2022-07-22 16:15:25,888 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 28 [2022-07-22 16:15:25,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-22 16:15:25,888 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2022-07-22 16:15:25,888 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-07-22 16:15:25,889 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2022-07-22 16:15:25,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-07-22 16:15:25,889 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 16:15:25,890 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 16:15:25,922 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-07-22 16:15:26,107 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 16:15:26,108 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 16:15:26,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 16:15:26,108 INFO L85 PathProgramCache]: Analyzing trace with hash -1091220578, now seen corresponding path program 1 times [2022-07-22 16:15:26,109 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 16:15:26,109 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [247603458] [2022-07-22 16:15:26,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 16:15:26,109 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 16:15:26,124 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-22 16:15:26,125 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1866136616] [2022-07-22 16:15:26,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 16:15:26,127 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 16:15:26,128 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-22 16:15:26,129 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-22 16:15:26,130 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-07-22 16:15:26,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 16:15:26,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 5 conjunts are in the unsatisfiable core [2022-07-22 16:15:26,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-22 16:15:26,225 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 18 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-07-22 16:15:26,225 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-22 16:15:26,267 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-07-22 16:15:26,268 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 16:15:26,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [247603458] [2022-07-22 16:15:26,268 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-22 16:15:26,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1866136616] [2022-07-22 16:15:26,270 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1866136616] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-22 16:15:26,270 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-22 16:15:26,270 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2022-07-22 16:15:26,271 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80810160] [2022-07-22 16:15:26,271 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-22 16:15:26,272 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-07-22 16:15:26,272 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 16:15:26,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-07-22 16:15:26,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-07-22 16:15:26,274 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 8 states, 8 states have (on average 3.875) internal successors, (31), 8 states have internal predecessors, (31), 3 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2022-07-22 16:15:26,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 16:15:26,405 INFO L93 Difference]: Finished difference Result 163 states and 196 transitions. [2022-07-22 16:15:26,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-07-22 16:15:26,406 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 8 states have internal predecessors, (31), 3 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 35 [2022-07-22 16:15:26,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-22 16:15:26,409 INFO L225 Difference]: With dead ends: 163 [2022-07-22 16:15:26,409 INFO L226 Difference]: Without dead ends: 127 [2022-07-22 16:15:26,412 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2022-07-22 16:15:26,413 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 39 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 155 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-22 16:15:26,414 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 155 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-22 16:15:26,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2022-07-22 16:15:26,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 120. [2022-07-22 16:15:26,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 78 states have (on average 1.1538461538461537) internal successors, (90), 83 states have internal predecessors, (90), 26 states have call successors, (26), 16 states have call predecessors, (26), 15 states have return successors, (23), 20 states have call predecessors, (23), 23 states have call successors, (23) [2022-07-22 16:15:26,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 139 transitions. [2022-07-22 16:15:26,445 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 139 transitions. Word has length 35 [2022-07-22 16:15:26,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-22 16:15:26,446 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 139 transitions. [2022-07-22 16:15:26,446 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 8 states have internal predecessors, (31), 3 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2022-07-22 16:15:26,447 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 139 transitions. [2022-07-22 16:15:26,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-07-22 16:15:26,452 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 16:15:26,452 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 16:15:26,479 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-07-22 16:15:26,677 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 16:15:26,677 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 16:15:26,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 16:15:26,678 INFO L85 PathProgramCache]: Analyzing trace with hash -785132454, now seen corresponding path program 1 times [2022-07-22 16:15:26,678 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 16:15:26,678 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1570686930] [2022-07-22 16:15:26,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 16:15:26,678 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 16:15:26,689 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-22 16:15:26,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1035940276] [2022-07-22 16:15:26,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 16:15:26,689 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 16:15:26,689 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-22 16:15:26,695 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-22 16:15:26,696 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-07-22 16:15:26,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 16:15:26,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 7 conjunts are in the unsatisfiable core [2022-07-22 16:15:26,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-22 16:15:26,821 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 36 proven. 42 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-07-22 16:15:26,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-22 16:15:26,893 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-07-22 16:15:26,894 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 16:15:26,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1570686930] [2022-07-22 16:15:26,894 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-22 16:15:26,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1035940276] [2022-07-22 16:15:26,894 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1035940276] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-22 16:15:26,895 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-22 16:15:26,895 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2022-07-22 16:15:26,895 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023092626] [2022-07-22 16:15:26,895 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-22 16:15:26,897 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-07-22 16:15:26,897 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 16:15:26,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-07-22 16:15:26,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-07-22 16:15:26,899 INFO L87 Difference]: Start difference. First operand 120 states and 139 transitions. Second operand has 10 states, 10 states have (on average 3.8) internal successors, (38), 10 states have internal predecessors, (38), 5 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2022-07-22 16:15:27,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 16:15:27,085 INFO L93 Difference]: Finished difference Result 234 states and 279 transitions. [2022-07-22 16:15:27,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-07-22 16:15:27,085 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 10 states have internal predecessors, (38), 5 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 51 [2022-07-22 16:15:27,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-22 16:15:27,088 INFO L225 Difference]: With dead ends: 234 [2022-07-22 16:15:27,088 INFO L226 Difference]: Without dead ends: 213 [2022-07-22 16:15:27,089 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=104, Unknown=0, NotChecked=0, Total=156 [2022-07-22 16:15:27,091 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 85 mSDsluCounter, 191 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 244 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-07-22 16:15:27,092 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [85 Valid, 244 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-07-22 16:15:27,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2022-07-22 16:15:27,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 208. [2022-07-22 16:15:27,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 138 states have (on average 1.1666666666666667) internal successors, (161), 146 states have internal predecessors, (161), 44 states have call successors, (44), 25 states have call predecessors, (44), 25 states have return successors, (40), 36 states have call predecessors, (40), 40 states have call successors, (40) [2022-07-22 16:15:27,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 245 transitions. [2022-07-22 16:15:27,131 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 245 transitions. Word has length 51 [2022-07-22 16:15:27,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-22 16:15:27,132 INFO L495 AbstractCegarLoop]: Abstraction has 208 states and 245 transitions. [2022-07-22 16:15:27,132 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 10 states have internal predecessors, (38), 5 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2022-07-22 16:15:27,132 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 245 transitions. [2022-07-22 16:15:27,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-07-22 16:15:27,136 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 16:15:27,136 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 16:15:27,164 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-07-22 16:15:27,361 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 16:15:27,361 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 16:15:27,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 16:15:27,362 INFO L85 PathProgramCache]: Analyzing trace with hash 98519191, now seen corresponding path program 1 times [2022-07-22 16:15:27,362 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 16:15:27,362 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387434893] [2022-07-22 16:15:27,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 16:15:27,362 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 16:15:27,372 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-22 16:15:27,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1273594883] [2022-07-22 16:15:27,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 16:15:27,373 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 16:15:27,373 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-22 16:15:27,378 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-22 16:15:27,379 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-07-22 16:15:27,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 16:15:27,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 29 conjunts are in the unsatisfiable core [2022-07-22 16:15:27,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-22 16:15:28,263 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 36 proven. 10 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-07-22 16:15:28,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-22 16:15:57,286 WARN L233 SmtUtils]: Spent 11.76s on a formula simplification that was a NOOP. DAG size: 53 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-07-22 16:17:18,800 WARN L233 SmtUtils]: Spent 25.77s on a formula simplification that was a NOOP. DAG size: 54 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-07-22 16:18:47,670 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 36 proven. 10 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-07-22 16:18:47,671 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 16:18:47,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [387434893] [2022-07-22 16:18:47,671 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-22 16:18:47,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1273594883] [2022-07-22 16:18:47,671 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1273594883] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-22 16:18:47,671 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-22 16:18:47,672 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 19 [2022-07-22 16:18:47,672 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355905190] [2022-07-22 16:18:47,672 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-22 16:18:47,673 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-07-22 16:18:47,673 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 16:18:47,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-07-22 16:18:47,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=270, Unknown=2, NotChecked=0, Total=342 [2022-07-22 16:18:47,674 INFO L87 Difference]: Start difference. First operand 208 states and 245 transitions. Second operand has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 16 states have internal predecessors, (40), 8 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 8 states have call predecessors, (16), 6 states have call successors, (16) [2022-07-22 16:18:50,653 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 16:19:02,514 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 16:19:04,524 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-07-22 16:19:08,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 16:19:08,347 INFO L93 Difference]: Finished difference Result 320 states and 388 transitions. [2022-07-22 16:19:08,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-07-22 16:19:08,348 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 16 states have internal predecessors, (40), 8 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 8 states have call predecessors, (16), 6 states have call successors, (16) Word has length 60 [2022-07-22 16:19:08,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-22 16:19:08,350 INFO L225 Difference]: With dead ends: 320 [2022-07-22 16:19:08,350 INFO L226 Difference]: Without dead ends: 253 [2022-07-22 16:19:08,351 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 100 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 50.9s TimeCoverageRelationStatistics Valid=127, Invalid=520, Unknown=3, NotChecked=0, Total=650 [2022-07-22 16:19:08,352 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 66 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 537 mSolverCounterSat, 100 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 640 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 537 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.3s IncrementalHoareTripleChecker+Time [2022-07-22 16:19:08,352 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 193 Invalid, 640 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 537 Invalid, 3 Unknown, 0 Unchecked, 13.3s Time] [2022-07-22 16:19:08,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2022-07-22 16:19:08,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 243. [2022-07-22 16:19:08,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 165 states have (on average 1.1575757575757575) internal successors, (191), 173 states have internal predecessors, (191), 49 states have call successors, (49), 29 states have call predecessors, (49), 28 states have return successors, (45), 40 states have call predecessors, (45), 45 states have call successors, (45) [2022-07-22 16:19:08,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 285 transitions. [2022-07-22 16:19:08,376 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 285 transitions. Word has length 60 [2022-07-22 16:19:08,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-22 16:19:08,377 INFO L495 AbstractCegarLoop]: Abstraction has 243 states and 285 transitions. [2022-07-22 16:19:08,377 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 16 states have internal predecessors, (40), 8 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 8 states have call predecessors, (16), 6 states have call successors, (16) [2022-07-22 16:19:08,377 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 285 transitions. [2022-07-22 16:19:08,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-07-22 16:19:08,378 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 16:19:08,378 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 16:19:08,404 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-07-22 16:19:08,579 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 16:19:08,579 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 16:19:08,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 16:19:08,579 INFO L85 PathProgramCache]: Analyzing trace with hash -902942769, now seen corresponding path program 1 times [2022-07-22 16:19:08,580 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 16:19:08,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193252231] [2022-07-22 16:19:08,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 16:19:08,580 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 16:19:08,604 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-22 16:19:08,604 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [103839971] [2022-07-22 16:19:08,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 16:19:08,611 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 16:19:08,612 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-22 16:19:08,614 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-22 16:19:08,616 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-07-22 16:19:08,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 16:19:08,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 13 conjunts are in the unsatisfiable core [2022-07-22 16:19:08,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-22 16:19:08,815 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 186 trivial. 0 not checked. [2022-07-22 16:19:08,815 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-22 16:19:08,982 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 186 trivial. 0 not checked. [2022-07-22 16:19:08,983 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 16:19:08,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193252231] [2022-07-22 16:19:08,983 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-22 16:19:08,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [103839971] [2022-07-22 16:19:08,983 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [103839971] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-22 16:19:08,983 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-22 16:19:08,983 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2022-07-22 16:19:08,983 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436364548] [2022-07-22 16:19:08,983 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-22 16:19:08,984 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-07-22 16:19:08,984 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 16:19:08,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-07-22 16:19:08,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2022-07-22 16:19:08,985 INFO L87 Difference]: Start difference. First operand 243 states and 285 transitions. Second operand has 9 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 8 states have internal predecessors, (25), 5 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-07-22 16:19:09,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 16:19:09,358 INFO L93 Difference]: Finished difference Result 266 states and 313 transitions. [2022-07-22 16:19:09,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-07-22 16:19:09,359 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 8 states have internal predecessors, (25), 5 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 71 [2022-07-22 16:19:09,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-22 16:19:09,361 INFO L225 Difference]: With dead ends: 266 [2022-07-22 16:19:09,362 INFO L226 Difference]: Without dead ends: 251 [2022-07-22 16:19:09,362 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 131 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2022-07-22 16:19:09,363 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 24 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-07-22 16:19:09,363 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 129 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-07-22 16:19:09,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2022-07-22 16:19:09,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 248. [2022-07-22 16:19:09,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 248 states, 169 states have (on average 1.1538461538461537) internal successors, (195), 176 states have internal predecessors, (195), 50 states have call successors, (50), 28 states have call predecessors, (50), 28 states have return successors, (47), 43 states have call predecessors, (47), 47 states have call successors, (47) [2022-07-22 16:19:09,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 292 transitions. [2022-07-22 16:19:09,401 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 292 transitions. Word has length 71 [2022-07-22 16:19:09,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-22 16:19:09,401 INFO L495 AbstractCegarLoop]: Abstraction has 248 states and 292 transitions. [2022-07-22 16:19:09,401 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 8 states have internal predecessors, (25), 5 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-07-22 16:19:09,402 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 292 transitions. [2022-07-22 16:19:09,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-07-22 16:19:09,402 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 16:19:09,403 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 16:19:09,426 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-07-22 16:19:09,619 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 16:19:09,620 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 16:19:09,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 16:19:09,620 INFO L85 PathProgramCache]: Analyzing trace with hash -1932765757, now seen corresponding path program 2 times [2022-07-22 16:19:09,620 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 16:19:09,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [503268515] [2022-07-22 16:19:09,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 16:19:09,621 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 16:19:09,629 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-22 16:19:09,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [472060967] [2022-07-22 16:19:09,629 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-07-22 16:19:09,630 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 16:19:09,630 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-22 16:19:09,631 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-22 16:19:09,646 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-07-22 16:19:09,683 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-07-22 16:19:09,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-22 16:19:09,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 7 conjunts are in the unsatisfiable core [2022-07-22 16:19:09,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-22 16:19:09,724 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 27 proven. 11 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2022-07-22 16:19:09,728 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-22 16:19:09,811 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 27 proven. 11 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2022-07-22 16:19:09,811 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 16:19:09,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [503268515] [2022-07-22 16:19:09,811 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-22 16:19:09,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [472060967] [2022-07-22 16:19:09,812 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [472060967] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-22 16:19:09,812 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-22 16:19:09,812 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2022-07-22 16:19:09,812 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [105079277] [2022-07-22 16:19:09,812 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-22 16:19:09,813 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-07-22 16:19:09,813 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 16:19:09,813 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-07-22 16:19:09,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-07-22 16:19:09,814 INFO L87 Difference]: Start difference. First operand 248 states and 292 transitions. Second operand has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 4 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2022-07-22 16:19:09,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 16:19:09,880 INFO L93 Difference]: Finished difference Result 275 states and 326 transitions. [2022-07-22 16:19:09,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-07-22 16:19:09,881 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 4 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 74 [2022-07-22 16:19:09,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-22 16:19:09,883 INFO L225 Difference]: With dead ends: 275 [2022-07-22 16:19:09,883 INFO L226 Difference]: Without dead ends: 218 [2022-07-22 16:19:09,884 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 142 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-07-22 16:19:09,885 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 0 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-22 16:19:09,885 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 111 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-22 16:19:09,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2022-07-22 16:19:09,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 218. [2022-07-22 16:19:09,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 149 states have (on average 1.1476510067114094) internal successors, (171), 155 states have internal predecessors, (171), 43 states have call successors, (43), 25 states have call predecessors, (43), 25 states have return successors, (41), 37 states have call predecessors, (41), 41 states have call successors, (41) [2022-07-22 16:19:09,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 255 transitions. [2022-07-22 16:19:09,911 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 255 transitions. Word has length 74 [2022-07-22 16:19:09,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-22 16:19:09,912 INFO L495 AbstractCegarLoop]: Abstraction has 218 states and 255 transitions. [2022-07-22 16:19:09,912 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 4 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2022-07-22 16:19:09,912 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 255 transitions. [2022-07-22 16:19:09,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-07-22 16:19:09,915 INFO L187 NwaCegarLoop]: Found error trace [2022-07-22 16:19:09,916 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 16:19:09,943 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-07-22 16:19:10,143 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-07-22 16:19:10,144 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-22 16:19:10,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 16:19:10,144 INFO L85 PathProgramCache]: Analyzing trace with hash -1315137972, now seen corresponding path program 3 times [2022-07-22 16:19:10,144 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 16:19:10,144 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1633071282] [2022-07-22 16:19:10,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 16:19:10,145 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 16:19:10,163 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-22 16:19:10,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [982137766] [2022-07-22 16:19:10,171 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-07-22 16:19:10,171 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-22 16:19:10,171 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-22 16:19:10,173 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-22 16:19:10,174 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-07-22 16:19:10,253 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-07-22 16:19:10,254 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-07-22 16:19:10,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 40 conjunts are in the unsatisfiable core [2022-07-22 16:19:10,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-22 16:19:10,835 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 26 proven. 30 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2022-07-22 16:19:10,835 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-22 16:19:50,976 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 26 proven. 30 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2022-07-22 16:19:50,977 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 16:19:50,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1633071282] [2022-07-22 16:19:50,977 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-07-22 16:19:50,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [982137766] [2022-07-22 16:19:50,977 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [982137766] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-22 16:19:50,977 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-07-22 16:19:50,977 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 18 [2022-07-22 16:19:50,978 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000513000] [2022-07-22 16:19:50,978 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-07-22 16:19:50,978 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-07-22 16:19:50,978 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 16:19:50,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-07-22 16:19:50,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2022-07-22 16:19:50,979 INFO L87 Difference]: Start difference. First operand 218 states and 255 transitions. Second operand has 18 states, 18 states have (on average 2.8333333333333335) internal successors, (51), 17 states have internal predecessors, (51), 10 states have call successors, (28), 2 states have call predecessors, (28), 1 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26)