./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/eca-rers2018/Problem13.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version c3fed411 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/eca-rers2018/Problem13.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 39257b2f2790dc593eb015569e826a332fcc3e3cd918d00daa305f748c1b3d75 --- Real Ultimate output --- This is Ultimate 0.2.2-tmp.no-commuhash-c3fed41 [2021-12-15 23:12:37,237 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-15 23:12:37,239 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-15 23:12:37,305 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-15 23:12:37,306 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-15 23:12:37,306 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-15 23:12:37,307 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-15 23:12:37,308 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-15 23:12:37,309 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-15 23:12:37,310 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-15 23:12:37,311 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-15 23:12:37,312 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-15 23:12:37,313 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-15 23:12:37,315 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-15 23:12:37,317 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-15 23:12:37,319 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-15 23:12:37,321 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-15 23:12:37,336 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-15 23:12:37,337 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-15 23:12:37,338 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-15 23:12:37,338 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-15 23:12:37,339 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-15 23:12:37,340 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-15 23:12:37,340 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-15 23:12:37,342 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-15 23:12:37,342 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-15 23:12:37,342 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-15 23:12:37,343 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-15 23:12:37,343 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-15 23:12:37,344 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-15 23:12:37,344 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-15 23:12:37,344 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-15 23:12:37,345 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-15 23:12:37,345 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-15 23:12:37,346 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-15 23:12:37,346 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-15 23:12:37,347 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-15 23:12:37,347 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-15 23:12:37,347 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-15 23:12:37,348 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-15 23:12:37,348 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-15 23:12:37,349 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-15 23:12:37,363 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-15 23:12:37,364 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-15 23:12:37,364 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-15 23:12:37,364 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-15 23:12:37,365 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-15 23:12:37,365 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-15 23:12:37,365 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-15 23:12:37,365 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-15 23:12:37,366 INFO L138 SettingsManager]: * Use SBE=true [2021-12-15 23:12:37,366 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-15 23:12:37,366 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-15 23:12:37,366 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-15 23:12:37,366 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-15 23:12:37,367 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-15 23:12:37,367 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-15 23:12:37,367 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-15 23:12:37,367 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-15 23:12:37,367 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-15 23:12:37,367 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-15 23:12:37,368 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-15 23:12:37,368 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-15 23:12:37,368 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-15 23:12:37,368 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-15 23:12:37,368 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-15 23:12:37,368 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-15 23:12:37,369 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-15 23:12:37,369 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-15 23:12:37,369 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-15 23:12:37,369 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-15 23:12:37,369 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-15 23:12:37,370 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-15 23:12:37,370 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-15 23:12:37,370 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-15 23:12:37,370 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-15 23:12:37,370 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 39257b2f2790dc593eb015569e826a332fcc3e3cd918d00daa305f748c1b3d75 [2021-12-15 23:12:37,599 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-15 23:12:37,627 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-15 23:12:37,629 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-15 23:12:37,629 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-15 23:12:37,630 INFO L275 PluginConnector]: CDTParser initialized [2021-12-15 23:12:37,631 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/eca-rers2018/Problem13.c [2021-12-15 23:12:37,680 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5952f2697/56b40841931d480cb640cfdd57e3c198/FLAGfdf392d52 [2021-12-15 23:12:38,724 INFO L306 CDTParser]: Found 1 translation units. [2021-12-15 23:12:38,725 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2018/Problem13.c [2021-12-15 23:12:38,858 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5952f2697/56b40841931d480cb640cfdd57e3c198/FLAGfdf392d52 [2021-12-15 23:12:38,941 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5952f2697/56b40841931d480cb640cfdd57e3c198 [2021-12-15 23:12:38,945 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-15 23:12:38,948 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-15 23:12:38,949 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-15 23:12:38,949 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-15 23:12:38,952 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-15 23:12:38,957 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.12 11:12:38" (1/1) ... [2021-12-15 23:12:38,959 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1a3a319c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 11:12:38, skipping insertion in model container [2021-12-15 23:12:38,959 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.12 11:12:38" (1/1) ... [2021-12-15 23:12:38,964 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-15 23:12:39,401 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-15 23:12:39,673 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/eca-rers2018/Problem13.c[778,791] [2021-12-15 23:12:39,694 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/eca-rers2018/Problem13.c[817,830] [2021-12-15 23:12:51,919 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-15 23:12:51,929 INFO L203 MainTranslator]: Completed pre-run [2021-12-15 23:12:51,936 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/eca-rers2018/Problem13.c[778,791] [2021-12-15 23:12:51,937 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/eca-rers2018/Problem13.c[817,830] [2021-12-15 23:12:53,045 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-15 23:12:53,920 INFO L208 MainTranslator]: Completed translation [2021-12-15 23:12:53,920 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 11:12:53 WrapperNode [2021-12-15 23:12:53,920 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-15 23:12:53,921 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-15 23:12:53,921 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-15 23:12:53,921 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-15 23:12:53,942 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 11:12:53" (1/1) ... [2021-12-15 23:12:54,293 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 11:12:53" (1/1) ... [2021-12-15 23:12:55,291 INFO L137 Inliner]: procedures = 710, calls = 701, calls flagged for inlining = 597, calls inlined = 597, statements flattened = 108769 [2021-12-15 23:12:55,291 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-15 23:12:55,292 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-15 23:12:55,292 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-15 23:12:55,292 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-15 23:12:55,298 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 11:12:53" (1/1) ... [2021-12-15 23:12:55,298 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 11:12:53" (1/1) ... [2021-12-15 23:12:55,527 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 11:12:53" (1/1) ... [2021-12-15 23:12:55,528 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 11:12:53" (1/1) ... [2021-12-15 23:12:56,148 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 11:12:53" (1/1) ... [2021-12-15 23:12:56,236 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 11:12:53" (1/1) ... [2021-12-15 23:12:56,296 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 11:12:53" (1/1) ... [2021-12-15 23:12:56,494 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-15 23:12:56,494 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-15 23:12:56,494 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-15 23:12:56,495 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-15 23:12:56,496 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 11:12:53" (1/1) ... [2021-12-15 23:12:56,500 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-15 23:12:56,511 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-15 23:12:56,524 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) [2021-12-15 23:12:56,541 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 [2021-12-15 23:12:56,551 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-15 23:12:56,551 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-15 23:12:56,551 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-15 23:12:56,551 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error_a [2021-12-15 23:12:56,551 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error_a [2021-12-15 23:12:56,551 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error_b [2021-12-15 23:12:56,551 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error_b [2021-12-15 23:12:56,552 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-15 23:12:56,862 INFO L236 CfgBuilder]: Building ICFG [2021-12-15 23:12:56,864 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-15 23:13:08,955 INFO L277 CfgBuilder]: Performing block encoding [2021-12-15 23:13:08,974 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-15 23:13:08,974 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-12-15 23:13:08,978 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.12 11:13:08 BoogieIcfgContainer [2021-12-15 23:13:08,979 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-15 23:13:08,980 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-15 23:13:08,980 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-15 23:13:08,982 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-15 23:13:08,982 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.12 11:12:38" (1/3) ... [2021-12-15 23:13:08,983 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5eed40d7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.12 11:13:08, skipping insertion in model container [2021-12-15 23:13:08,983 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.12 11:12:53" (2/3) ... [2021-12-15 23:13:08,983 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5eed40d7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.12 11:13:08, skipping insertion in model container [2021-12-15 23:13:08,984 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.12 11:13:08" (3/3) ... [2021-12-15 23:13:08,984 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem13.c [2021-12-15 23:13:08,988 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-15 23:13:08,988 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-12-15 23:13:09,029 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-15 23:13:09,034 INFO L339 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, mLoopAccelerationTechnique=FAST_UPR [2021-12-15 23:13:09,034 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-12-15 23:13:09,079 INFO L276 IsEmpty]: Start isEmpty. Operand has 3533 states, 3428 states have (on average 1.8246791131855309) internal successors, (6255), 3430 states have internal predecessors, (6255), 100 states have call successors, (100), 2 states have call predecessors, (100), 2 states have return successors, (100), 100 states have call predecessors, (100), 100 states have call successors, (100) [2021-12-15 23:13:09,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-15 23:13:09,092 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 23:13:09,093 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-15 23:13:09,093 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 23:13:09,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 23:13:09,100 INFO L85 PathProgramCache]: Analyzing trace with hash -1914797321, now seen corresponding path program 1 times [2021-12-15 23:13:09,105 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 23:13:09,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [254400633] [2021-12-15 23:13:09,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 23:13:09,107 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 23:13:09,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 23:13:09,409 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 23:13:09,410 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 23:13:09,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [254400633] [2021-12-15 23:13:09,410 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [254400633] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-15 23:13:09,411 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-15 23:13:09,411 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-15 23:13:09,412 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2093174639] [2021-12-15 23:13:09,412 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-15 23:13:09,415 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-15 23:13:09,416 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 23:13:09,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-15 23:13:09,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-15 23:13:09,446 INFO L87 Difference]: Start difference. First operand has 3533 states, 3428 states have (on average 1.8246791131855309) internal successors, (6255), 3430 states have internal predecessors, (6255), 100 states have call successors, (100), 2 states have call predecessors, (100), 2 states have return successors, (100), 100 states have call predecessors, (100), 100 states have call successors, (100) Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 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) [2021-12-15 23:13:16,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 23:13:16,812 INFO L93 Difference]: Finished difference Result 9556 states and 17573 transitions. [2021-12-15 23:13:16,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-15 23:13:16,836 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 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 13 [2021-12-15 23:13:16,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-15 23:13:16,864 INFO L225 Difference]: With dead ends: 9556 [2021-12-15 23:13:16,865 INFO L226 Difference]: Without dead ends: 6016 [2021-12-15 23:13:16,873 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-15 23:13:16,875 INFO L933 BasicCegarLoop]: 6282 mSDtfsCounter, 4696 mSDsluCounter, 3321 mSDsCounter, 0 mSdLazyCounter, 7368 mSolverCounterSat, 821 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4696 SdHoareTripleChecker+Valid, 9603 SdHoareTripleChecker+Invalid, 8189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 821 IncrementalHoareTripleChecker+Valid, 7368 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.0s IncrementalHoareTripleChecker+Time [2021-12-15 23:13:16,876 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4696 Valid, 9603 Invalid, 8189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [821 Valid, 7368 Invalid, 0 Unknown, 0 Unchecked, 7.0s Time] [2021-12-15 23:13:16,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6016 states. [2021-12-15 23:13:16,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6016 to 5245. [2021-12-15 23:13:17,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5245 states, 5143 states have (on average 1.7841726618705036) internal successors, (9176), 5242 states have internal predecessors, (9176), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 23:13:17,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5245 states to 5245 states and 9276 transitions. [2021-12-15 23:13:17,028 INFO L78 Accepts]: Start accepts. Automaton has 5245 states and 9276 transitions. Word has length 13 [2021-12-15 23:13:17,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-15 23:13:17,029 INFO L470 AbstractCegarLoop]: Abstraction has 5245 states and 9276 transitions. [2021-12-15 23:13:17,029 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 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) [2021-12-15 23:13:17,030 INFO L276 IsEmpty]: Start isEmpty. Operand 5245 states and 9276 transitions. [2021-12-15 23:13:17,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-12-15 23:13:17,033 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 23:13:17,033 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-15 23:13:17,033 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-15 23:13:17,034 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 23:13:17,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 23:13:17,036 INFO L85 PathProgramCache]: Analyzing trace with hash -873779178, now seen corresponding path program 1 times [2021-12-15 23:13:17,036 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 23:13:17,036 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [123238432] [2021-12-15 23:13:17,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 23:13:17,037 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 23:13:17,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 23:13:17,152 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 23:13:17,153 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 23:13:17,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [123238432] [2021-12-15 23:13:17,153 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [123238432] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-15 23:13:17,153 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-15 23:13:17,153 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-15 23:13:17,154 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383273292] [2021-12-15 23:13:17,154 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-15 23:13:17,155 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-15 23:13:17,155 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 23:13:17,155 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-15 23:13:17,155 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-15 23:13:17,156 INFO L87 Difference]: Start difference. First operand 5245 states and 9276 transitions. Second operand has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 states have internal predecessors, (21), 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) [2021-12-15 23:13:21,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 23:13:21,492 INFO L93 Difference]: Finished difference Result 11853 states and 20876 transitions. [2021-12-15 23:13:21,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-15 23:13:21,493 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 states have internal predecessors, (21), 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 22 [2021-12-15 23:13:21,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-15 23:13:21,512 INFO L225 Difference]: With dead ends: 11853 [2021-12-15 23:13:21,512 INFO L226 Difference]: Without dead ends: 6610 [2021-12-15 23:13:21,519 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-15 23:13:21,520 INFO L933 BasicCegarLoop]: 6516 mSDtfsCounter, 1904 mSDsluCounter, 3296 mSDsCounter, 0 mSdLazyCounter, 4502 mSolverCounterSat, 311 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1904 SdHoareTripleChecker+Valid, 9812 SdHoareTripleChecker+Invalid, 4813 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 311 IncrementalHoareTripleChecker+Valid, 4502 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2021-12-15 23:13:21,520 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1904 Valid, 9812 Invalid, 4813 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [311 Valid, 4502 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2021-12-15 23:13:21,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6610 states. [2021-12-15 23:13:21,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6610 to 6115. [2021-12-15 23:13:21,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6115 states, 6013 states have (on average 1.7490437385664395) internal successors, (10517), 6112 states have internal predecessors, (10517), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 23:13:21,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6115 states to 6115 states and 10617 transitions. [2021-12-15 23:13:21,614 INFO L78 Accepts]: Start accepts. Automaton has 6115 states and 10617 transitions. Word has length 22 [2021-12-15 23:13:21,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-15 23:13:21,616 INFO L470 AbstractCegarLoop]: Abstraction has 6115 states and 10617 transitions. [2021-12-15 23:13:21,617 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 states have internal predecessors, (21), 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) [2021-12-15 23:13:21,617 INFO L276 IsEmpty]: Start isEmpty. Operand 6115 states and 10617 transitions. [2021-12-15 23:13:21,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-12-15 23:13:21,618 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 23:13:21,618 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-15 23:13:21,619 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-15 23:13:21,619 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 23:13:21,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 23:13:21,623 INFO L85 PathProgramCache]: Analyzing trace with hash -2028786272, now seen corresponding path program 1 times [2021-12-15 23:13:21,623 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 23:13:21,623 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896661963] [2021-12-15 23:13:21,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 23:13:21,623 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 23:13:21,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 23:13:21,696 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 23:13:21,697 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 23:13:21,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896661963] [2021-12-15 23:13:21,698 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1896661963] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-15 23:13:21,698 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-15 23:13:21,698 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-15 23:13:21,698 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699092726] [2021-12-15 23:13:21,699 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-15 23:13:21,699 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-15 23:13:21,700 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 23:13:21,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-15 23:13:21,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-15 23:13:21,700 INFO L87 Difference]: Start difference. First operand 6115 states and 10617 transitions. Second operand has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 2 states have internal predecessors, (31), 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) [2021-12-15 23:13:21,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 23:13:21,918 INFO L93 Difference]: Finished difference Result 17808 states and 30942 transitions. [2021-12-15 23:13:21,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-15 23:13:21,918 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 2 states have internal predecessors, (31), 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 32 [2021-12-15 23:13:21,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-15 23:13:21,965 INFO L225 Difference]: With dead ends: 17808 [2021-12-15 23:13:21,965 INFO L226 Difference]: Without dead ends: 11695 [2021-12-15 23:13:21,979 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-15 23:13:21,983 INFO L933 BasicCegarLoop]: 6287 mSDtfsCounter, 6151 mSDsluCounter, 6031 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6151 SdHoareTripleChecker+Valid, 12318 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-15 23:13:21,985 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6151 Valid, 12318 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-15 23:13:21,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11695 states. [2021-12-15 23:13:22,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11695 to 11596. [2021-12-15 23:13:22,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11596 states, 11494 states have (on average 1.7502175047851052) internal successors, (20117), 11593 states have internal predecessors, (20117), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 23:13:22,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11596 states to 11596 states and 20217 transitions. [2021-12-15 23:13:22,177 INFO L78 Accepts]: Start accepts. Automaton has 11596 states and 20217 transitions. Word has length 32 [2021-12-15 23:13:22,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-15 23:13:22,178 INFO L470 AbstractCegarLoop]: Abstraction has 11596 states and 20217 transitions. [2021-12-15 23:13:22,178 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 2 states have internal predecessors, (31), 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) [2021-12-15 23:13:22,178 INFO L276 IsEmpty]: Start isEmpty. Operand 11596 states and 20217 transitions. [2021-12-15 23:13:22,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-12-15 23:13:22,179 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 23:13:22,179 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-15 23:13:22,180 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-12-15 23:13:22,180 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 23:13:22,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 23:13:22,181 INFO L85 PathProgramCache]: Analyzing trace with hash 342220768, now seen corresponding path program 1 times [2021-12-15 23:13:22,181 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 23:13:22,181 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [301516419] [2021-12-15 23:13:22,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 23:13:22,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 23:13:22,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 23:13:22,246 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 23:13:22,247 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 23:13:22,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [301516419] [2021-12-15 23:13:22,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [301516419] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-15 23:13:22,247 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-15 23:13:22,247 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-15 23:13:22,247 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748283782] [2021-12-15 23:13:22,247 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-15 23:13:22,248 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-15 23:13:22,248 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 23:13:22,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-15 23:13:22,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-15 23:13:22,249 INFO L87 Difference]: Start difference. First operand 11596 states and 20217 transitions. Second operand has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 2 states have internal predecessors, (31), 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) [2021-12-15 23:13:22,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 23:13:22,566 INFO L93 Difference]: Finished difference Result 34504 states and 60181 transitions. [2021-12-15 23:13:22,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-15 23:13:22,567 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 2 states have internal predecessors, (31), 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 32 [2021-12-15 23:13:22,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-15 23:13:22,606 INFO L225 Difference]: With dead ends: 34504 [2021-12-15 23:13:22,607 INFO L226 Difference]: Without dead ends: 22910 [2021-12-15 23:13:22,628 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-15 23:13:22,632 INFO L933 BasicCegarLoop]: 6315 mSDtfsCounter, 6076 mSDsluCounter, 6151 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6076 SdHoareTripleChecker+Valid, 12466 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-15 23:13:22,633 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6076 Valid, 12466 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-15 23:13:22,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22910 states. [2021-12-15 23:13:22,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22910 to 22809. [2021-12-15 23:13:22,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22809 states, 22707 states have (on average 1.7501651473114017) internal successors, (39741), 22806 states have internal predecessors, (39741), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 23:13:22,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22809 states to 22809 states and 39841 transitions. [2021-12-15 23:13:22,948 INFO L78 Accepts]: Start accepts. Automaton has 22809 states and 39841 transitions. Word has length 32 [2021-12-15 23:13:22,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-15 23:13:22,949 INFO L470 AbstractCegarLoop]: Abstraction has 22809 states and 39841 transitions. [2021-12-15 23:13:22,949 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 2 states have internal predecessors, (31), 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) [2021-12-15 23:13:22,949 INFO L276 IsEmpty]: Start isEmpty. Operand 22809 states and 39841 transitions. [2021-12-15 23:13:22,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-12-15 23:13:22,951 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 23:13:22,951 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-15 23:13:22,951 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-12-15 23:13:22,951 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 23:13:22,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 23:13:22,952 INFO L85 PathProgramCache]: Analyzing trace with hash 2018208297, now seen corresponding path program 1 times [2021-12-15 23:13:22,952 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 23:13:22,952 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1853409765] [2021-12-15 23:13:22,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 23:13:22,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 23:13:22,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 23:13:23,011 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 23:13:23,011 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 23:13:23,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1853409765] [2021-12-15 23:13:23,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1853409765] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-15 23:13:23,011 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-15 23:13:23,011 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-15 23:13:23,012 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954148068] [2021-12-15 23:13:23,012 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-15 23:13:23,012 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-15 23:13:23,012 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 23:13:23,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-15 23:13:23,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-15 23:13:23,013 INFO L87 Difference]: Start difference. First operand 22809 states and 39841 transitions. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 2 states have internal predecessors, (32), 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) [2021-12-15 23:13:23,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 23:13:23,301 INFO L93 Difference]: Finished difference Result 67983 states and 118693 transitions. [2021-12-15 23:13:23,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-15 23:13:23,302 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 2 states have internal predecessors, (32), 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 33 [2021-12-15 23:13:23,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-15 23:13:23,381 INFO L225 Difference]: With dead ends: 67983 [2021-12-15 23:13:23,381 INFO L226 Difference]: Without dead ends: 45176 [2021-12-15 23:13:23,423 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-15 23:13:23,424 INFO L933 BasicCegarLoop]: 6306 mSDtfsCounter, 6132 mSDsluCounter, 6148 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6132 SdHoareTripleChecker+Valid, 12454 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-15 23:13:23,424 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6132 Valid, 12454 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-15 23:13:23,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45176 states. [2021-12-15 23:13:23,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45176 to 45074. [2021-12-15 23:13:23,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45074 states, 44972 states have (on average 1.748332295650627) internal successors, (78626), 45071 states have internal predecessors, (78626), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 23:13:23,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45074 states to 45074 states and 78726 transitions. [2021-12-15 23:13:23,966 INFO L78 Accepts]: Start accepts. Automaton has 45074 states and 78726 transitions. Word has length 33 [2021-12-15 23:13:23,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-15 23:13:23,967 INFO L470 AbstractCegarLoop]: Abstraction has 45074 states and 78726 transitions. [2021-12-15 23:13:23,967 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 2 states have internal predecessors, (32), 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) [2021-12-15 23:13:23,967 INFO L276 IsEmpty]: Start isEmpty. Operand 45074 states and 78726 transitions. [2021-12-15 23:13:23,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-12-15 23:13:23,970 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 23:13:23,970 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-15 23:13:23,971 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-12-15 23:13:23,971 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 23:13:23,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 23:13:23,971 INFO L85 PathProgramCache]: Analyzing trace with hash -1860746363, now seen corresponding path program 1 times [2021-12-15 23:13:23,972 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 23:13:23,972 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [37088931] [2021-12-15 23:13:23,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 23:13:23,972 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 23:13:23,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 23:13:24,025 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 23:13:24,025 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 23:13:24,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [37088931] [2021-12-15 23:13:24,025 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [37088931] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-15 23:13:24,026 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-15 23:13:24,026 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-15 23:13:24,026 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604035757] [2021-12-15 23:13:24,026 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-15 23:13:24,026 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-15 23:13:24,026 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 23:13:24,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-15 23:13:24,027 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-15 23:13:24,027 INFO L87 Difference]: Start difference. First operand 45074 states and 78726 transitions. Second operand has 3 states, 3 states have (on average 11.0) internal successors, (33), 3 states have internal predecessors, (33), 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) [2021-12-15 23:13:27,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 23:13:27,371 INFO L93 Difference]: Finished difference Result 119282 states and 210384 transitions. [2021-12-15 23:13:27,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-15 23:13:27,372 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.0) internal successors, (33), 3 states have internal predecessors, (33), 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 34 [2021-12-15 23:13:27,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-15 23:13:27,539 INFO L225 Difference]: With dead ends: 119282 [2021-12-15 23:13:27,540 INFO L226 Difference]: Without dead ends: 74210 [2021-12-15 23:13:27,613 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-15 23:13:27,614 INFO L933 BasicCegarLoop]: 7496 mSDtfsCounter, 4604 mSDsluCounter, 4345 mSDsCounter, 0 mSdLazyCounter, 802 mSolverCounterSat, 2122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4604 SdHoareTripleChecker+Valid, 11841 SdHoareTripleChecker+Invalid, 2924 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2122 IncrementalHoareTripleChecker+Valid, 802 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2021-12-15 23:13:27,614 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4604 Valid, 11841 Invalid, 2924 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2122 Valid, 802 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2021-12-15 23:13:27,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74210 states. [2021-12-15 23:13:28,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74210 to 72380. [2021-12-15 23:13:28,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72380 states, 72278 states have (on average 1.7643266277428817) internal successors, (127522), 72377 states have internal predecessors, (127522), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 23:13:28,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72380 states to 72380 states and 127622 transitions. [2021-12-15 23:13:28,545 INFO L78 Accepts]: Start accepts. Automaton has 72380 states and 127622 transitions. Word has length 34 [2021-12-15 23:13:28,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-15 23:13:28,545 INFO L470 AbstractCegarLoop]: Abstraction has 72380 states and 127622 transitions. [2021-12-15 23:13:28,545 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.0) internal successors, (33), 3 states have internal predecessors, (33), 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) [2021-12-15 23:13:28,545 INFO L276 IsEmpty]: Start isEmpty. Operand 72380 states and 127622 transitions. [2021-12-15 23:13:28,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-12-15 23:13:28,546 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 23:13:28,547 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-15 23:13:28,547 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-12-15 23:13:28,547 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 23:13:28,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 23:13:28,547 INFO L85 PathProgramCache]: Analyzing trace with hash -1849249746, now seen corresponding path program 1 times [2021-12-15 23:13:28,547 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 23:13:28,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [369219264] [2021-12-15 23:13:28,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 23:13:28,548 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 23:13:28,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 23:13:28,595 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 23:13:28,596 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 23:13:28,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [369219264] [2021-12-15 23:13:28,596 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [369219264] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-15 23:13:28,596 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-15 23:13:28,596 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-15 23:13:28,596 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960448240] [2021-12-15 23:13:28,596 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-15 23:13:28,597 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-15 23:13:28,597 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 23:13:28,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-15 23:13:28,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-15 23:13:28,598 INFO L87 Difference]: Start difference. First operand 72380 states and 127622 transitions. Second operand has 3 states, 3 states have (on average 11.333333333333334) internal successors, (34), 3 states have internal predecessors, (34), 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) [2021-12-15 23:13:31,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-15 23:13:31,955 INFO L93 Difference]: Finished difference Result 173282 states and 306742 transitions. [2021-12-15 23:13:31,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-15 23:13:31,959 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.333333333333334) internal successors, (34), 3 states have internal predecessors, (34), 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 35 [2021-12-15 23:13:31,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-15 23:13:32,138 INFO L225 Difference]: With dead ends: 173282 [2021-12-15 23:13:32,138 INFO L226 Difference]: Without dead ends: 100904 [2021-12-15 23:13:32,219 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-15 23:13:32,219 INFO L933 BasicCegarLoop]: 9938 mSDtfsCounter, 4494 mSDsluCounter, 4418 mSDsCounter, 0 mSdLazyCounter, 1862 mSolverCounterSat, 883 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4494 SdHoareTripleChecker+Valid, 14356 SdHoareTripleChecker+Invalid, 2745 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 883 IncrementalHoareTripleChecker+Valid, 1862 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2021-12-15 23:13:32,220 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4494 Valid, 14356 Invalid, 2745 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [883 Valid, 1862 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2021-12-15 23:13:32,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100904 states. [2021-12-15 23:13:33,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100904 to 97592. [2021-12-15 23:13:33,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97592 states, 97490 states have (on average 1.7635962662837215) internal successors, (171933), 97589 states have internal predecessors, (171933), 100 states have call successors, (100), 2 states have call predecessors, (100), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-15 23:13:33,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97592 states to 97592 states and 172033 transitions. [2021-12-15 23:13:33,532 INFO L78 Accepts]: Start accepts. Automaton has 97592 states and 172033 transitions. Word has length 35 [2021-12-15 23:13:33,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-15 23:13:33,532 INFO L470 AbstractCegarLoop]: Abstraction has 97592 states and 172033 transitions. [2021-12-15 23:13:33,533 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.333333333333334) internal successors, (34), 3 states have internal predecessors, (34), 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) [2021-12-15 23:13:33,533 INFO L276 IsEmpty]: Start isEmpty. Operand 97592 states and 172033 transitions. [2021-12-15 23:13:33,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-12-15 23:13:33,534 INFO L506 BasicCegarLoop]: Found error trace [2021-12-15 23:13:33,534 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-15 23:13:33,534 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-12-15 23:13:33,534 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION === [reach_error_aErr0ASSERT_VIOLATIONERROR_FUNCTION, reach_error_bErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-15 23:13:33,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-15 23:13:33,534 INFO L85 PathProgramCache]: Analyzing trace with hash 900277528, now seen corresponding path program 1 times [2021-12-15 23:13:33,534 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-15 23:13:33,535 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1409060750] [2021-12-15 23:13:33,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-15 23:13:33,535 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-15 23:13:33,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-15 23:13:33,604 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-15 23:13:33,604 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-15 23:13:33,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1409060750] [2021-12-15 23:13:33,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1409060750] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-15 23:13:33,605 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-15 23:13:33,605 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-15 23:13:33,605 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377975663] [2021-12-15 23:13:33,605 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-15 23:13:33,605 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-15 23:13:33,605 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-15 23:13:33,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-15 23:13:33,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-15 23:13:33,606 INFO L87 Difference]: Start difference. First operand 97592 states and 172033 transitions. Second operand has 4 states, 4 states have (on average 8.75) internal successors, (35), 3 states have internal predecessors, (35), 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)