./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/array-tiling/pnr2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version ff03de63 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/array-tiling/pnr2.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 67f3347d26557d25fb6343192d3c90918276f96e14a8e5c63bb68c9eaee65f5f --- Real Ultimate output --- This is Ultimate 0.2.2-dev-ff03de6 [2021-12-21 09:55:55,224 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-21 09:55:55,226 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-21 09:55:55,279 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-21 09:55:55,279 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-21 09:55:55,281 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-21 09:55:55,282 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-21 09:55:55,283 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-21 09:55:55,284 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-21 09:55:55,284 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-21 09:55:55,285 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-21 09:55:55,286 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-21 09:55:55,286 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-21 09:55:55,287 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-21 09:55:55,287 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-21 09:55:55,288 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-21 09:55:55,289 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-21 09:55:55,289 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-21 09:55:55,290 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-21 09:55:55,292 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-21 09:55:55,293 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-21 09:55:55,294 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-21 09:55:55,295 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-21 09:55:55,296 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-21 09:55:55,298 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-21 09:55:55,298 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-21 09:55:55,298 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-21 09:55:55,299 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-21 09:55:55,299 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-21 09:55:55,300 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-21 09:55:55,300 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-21 09:55:55,301 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-21 09:55:55,301 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-21 09:55:55,302 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-21 09:55:55,303 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-21 09:55:55,303 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-21 09:55:55,303 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-21 09:55:55,303 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-21 09:55:55,304 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-21 09:55:55,304 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-21 09:55:55,305 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-21 09:55:55,306 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-21 09:55:55,319 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-21 09:55:55,319 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-21 09:55:55,320 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-21 09:55:55,320 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-21 09:55:55,320 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-21 09:55:55,320 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-21 09:55:55,321 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-21 09:55:55,321 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-21 09:55:55,321 INFO L138 SettingsManager]: * Use SBE=true [2021-12-21 09:55:55,321 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-21 09:55:55,321 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-21 09:55:55,322 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-21 09:55:55,322 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-21 09:55:55,322 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-21 09:55:55,322 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-21 09:55:55,322 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-21 09:55:55,322 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-21 09:55:55,322 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-21 09:55:55,323 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-21 09:55:55,323 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-21 09:55:55,323 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-21 09:55:55,323 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-21 09:55:55,323 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-21 09:55:55,323 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-21 09:55:55,324 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 09:55:55,324 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-21 09:55:55,324 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-21 09:55:55,324 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-21 09:55:55,324 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-21 09:55:55,324 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-21 09:55:55,325 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-21 09:55:55,325 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-21 09:55:55,325 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-21 09:55:55,325 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-21 09:55:55,325 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 67f3347d26557d25fb6343192d3c90918276f96e14a8e5c63bb68c9eaee65f5f [2021-12-21 09:55:55,496 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-21 09:55:55,520 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-21 09:55:55,521 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-21 09:55:55,522 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-21 09:55:55,524 INFO L275 PluginConnector]: CDTParser initialized [2021-12-21 09:55:55,525 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-tiling/pnr2.c [2021-12-21 09:55:55,575 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a1c68001e/9a30e98a83384ef6b6d08a0380e444a2/FLAG84f5d3cf7 [2021-12-21 09:55:55,890 INFO L306 CDTParser]: Found 1 translation units. [2021-12-21 09:55:55,891 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-tiling/pnr2.c [2021-12-21 09:55:55,899 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a1c68001e/9a30e98a83384ef6b6d08a0380e444a2/FLAG84f5d3cf7 [2021-12-21 09:55:56,313 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a1c68001e/9a30e98a83384ef6b6d08a0380e444a2 [2021-12-21 09:55:56,314 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-21 09:55:56,315 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-21 09:55:56,323 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-21 09:55:56,323 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-21 09:55:56,325 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-21 09:55:56,326 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:55:56" (1/1) ... [2021-12-21 09:55:56,327 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@26a59af7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:55:56, skipping insertion in model container [2021-12-21 09:55:56,328 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:55:56" (1/1) ... [2021-12-21 09:55:56,332 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-21 09:55:56,345 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-21 09:55:56,499 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/array-tiling/pnr2.c[395,408] [2021-12-21 09:55:56,532 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 09:55:56,537 INFO L203 MainTranslator]: Completed pre-run [2021-12-21 09:55:56,551 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/array-tiling/pnr2.c[395,408] [2021-12-21 09:55:56,560 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 09:55:56,571 INFO L208 MainTranslator]: Completed translation [2021-12-21 09:55:56,572 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:55:56 WrapperNode [2021-12-21 09:55:56,572 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-21 09:55:56,573 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-21 09:55:56,573 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-21 09:55:56,573 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-21 09:55:56,578 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:55:56" (1/1) ... [2021-12-21 09:55:56,589 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:55:56" (1/1) ... [2021-12-21 09:55:56,609 INFO L137 Inliner]: procedures = 17, calls = 24, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 77 [2021-12-21 09:55:56,609 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-21 09:55:56,610 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-21 09:55:56,610 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-21 09:55:56,610 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-21 09:55:56,615 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:55:56" (1/1) ... [2021-12-21 09:55:56,615 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:55:56" (1/1) ... [2021-12-21 09:55:56,619 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:55:56" (1/1) ... [2021-12-21 09:55:56,619 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:55:56" (1/1) ... [2021-12-21 09:55:56,632 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:55:56" (1/1) ... [2021-12-21 09:55:56,635 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:55:56" (1/1) ... [2021-12-21 09:55:56,637 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:55:56" (1/1) ... [2021-12-21 09:55:56,640 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-21 09:55:56,641 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-21 09:55:56,641 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-21 09:55:56,642 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-21 09:55:56,642 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:55:56" (1/1) ... [2021-12-21 09:55:56,647 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 09:55:56,655 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:55:56,664 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) [2021-12-21 09:55:56,670 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 [2021-12-21 09:55:56,689 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-21 09:55:56,689 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-21 09:55:56,689 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-21 09:55:56,690 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-21 09:55:56,690 INFO L130 BoogieDeclarations]: Found specification of procedure ReadFromPort [2021-12-21 09:55:56,690 INFO L138 BoogieDeclarations]: Found implementation of procedure ReadFromPort [2021-12-21 09:55:56,690 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-21 09:55:56,690 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-21 09:55:56,690 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-21 09:55:56,739 INFO L234 CfgBuilder]: Building ICFG [2021-12-21 09:55:56,741 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-21 09:55:56,910 INFO L275 CfgBuilder]: Performing block encoding [2021-12-21 09:55:56,915 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-21 09:55:56,927 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-12-21 09:55:56,929 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:55:56 BoogieIcfgContainer [2021-12-21 09:55:56,929 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-21 09:55:56,930 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-21 09:55:56,930 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-21 09:55:56,934 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-21 09:55:56,939 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 09:55:56" (1/3) ... [2021-12-21 09:55:56,939 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@181a6829 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:55:56, skipping insertion in model container [2021-12-21 09:55:56,939 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:55:56" (2/3) ... [2021-12-21 09:55:56,940 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@181a6829 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:55:56, skipping insertion in model container [2021-12-21 09:55:56,940 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:55:56" (3/3) ... [2021-12-21 09:55:56,941 INFO L111 eAbstractionObserver]: Analyzing ICFG pnr2.c [2021-12-21 09:55:56,960 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-21 09:55:56,961 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-21 09:55:56,987 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-21 09:55:56,992 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 [2021-12-21 09:55:56,992 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-21 09:55:57,001 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 24 states have internal predecessors, (34), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-21 09:55:57,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-21 09:55:57,004 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:55:57,004 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:55:57,005 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:55:57,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:55:57,008 INFO L85 PathProgramCache]: Analyzing trace with hash -1808077575, now seen corresponding path program 1 times [2021-12-21 09:55:57,014 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:55:57,014 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2036713459] [2021-12-21 09:55:57,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:55:57,015 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:55:57,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:55:57,370 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 09:55:57,370 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:55:57,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2036713459] [2021-12-21 09:55:57,371 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2036713459] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 09:55:57,371 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 09:55:57,373 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-21 09:55:57,374 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584689664] [2021-12-21 09:55:57,375 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 09:55:57,378 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 09:55:57,379 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:55:57,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 09:55:57,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-12-21 09:55:57,410 INFO L87 Difference]: Start difference. First operand has 28 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 24 states have internal predecessors, (34), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:55:57,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:55:57,500 INFO L93 Difference]: Finished difference Result 66 states and 87 transitions. [2021-12-21 09:55:57,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-21 09:55:57,502 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-12-21 09:55:57,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:55:57,508 INFO L225 Difference]: With dead ends: 66 [2021-12-21 09:55:57,508 INFO L226 Difference]: Without dead ends: 32 [2021-12-21 09:55:57,511 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-12-21 09:55:57,514 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 48 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 09:55:57,515 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 44 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 09:55:57,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-12-21 09:55:57,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 25. [2021-12-21 09:55:57,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 21 states have internal predecessors, (25), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-21 09:55:57,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2021-12-21 09:55:57,553 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 11 [2021-12-21 09:55:57,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:55:57,553 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2021-12-21 09:55:57,553 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:55:57,553 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2021-12-21 09:55:57,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-21 09:55:57,555 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:55:57,555 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:55:57,556 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-21 09:55:57,556 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:55:57,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:55:57,557 INFO L85 PathProgramCache]: Analyzing trace with hash -2094570770, now seen corresponding path program 1 times [2021-12-21 09:55:57,557 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:55:57,557 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1752909068] [2021-12-21 09:55:57,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:55:57,558 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:55:57,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:55:57,731 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-21 09:55:57,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:55:57,744 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-21 09:55:57,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:55:57,751 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 09:55:57,751 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:55:57,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1752909068] [2021-12-21 09:55:57,751 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1752909068] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:55:57,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1703632377] [2021-12-21 09:55:57,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:55:57,752 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:55:57,752 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:55:57,753 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) [2021-12-21 09:55:57,755 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-21 09:55:57,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:55:57,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-21 09:55:57,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:55:57,928 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-21 09:55:57,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 09:55:57,970 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 21 [2021-12-21 09:55:58,019 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 09:55:58,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:55:58,082 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-12-21 09:55:58,084 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 22 [2021-12-21 09:55:58,110 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 09:55:58,110 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1703632377] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:55:58,110 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:55:58,110 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 6] total 13 [2021-12-21 09:55:58,111 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450604793] [2021-12-21 09:55:58,111 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:55:58,112 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-21 09:55:58,112 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:55:58,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-21 09:55:58,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2021-12-21 09:55:58,113 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 13 states have internal predecessors, (37), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-21 09:55:58,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:55:58,280 INFO L93 Difference]: Finished difference Result 66 states and 81 transitions. [2021-12-21 09:55:58,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-12-21 09:55:58,280 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 13 states have internal predecessors, (37), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 25 [2021-12-21 09:55:58,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:55:58,281 INFO L225 Difference]: With dead ends: 66 [2021-12-21 09:55:58,281 INFO L226 Difference]: Without dead ends: 64 [2021-12-21 09:55:58,282 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 47 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=275, Unknown=0, NotChecked=0, Total=380 [2021-12-21 09:55:58,283 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 61 mSDsluCounter, 155 mSDsCounter, 0 mSdLazyCounter, 191 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 191 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 09:55:58,283 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 192 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 191 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 09:55:58,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-12-21 09:55:58,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 36. [2021-12-21 09:55:58,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 30 states have internal predecessors, (37), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-21 09:55:58,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 45 transitions. [2021-12-21 09:55:58,289 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 45 transitions. Word has length 25 [2021-12-21 09:55:58,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:55:58,290 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 45 transitions. [2021-12-21 09:55:58,290 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 13 states have internal predecessors, (37), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-21 09:55:58,290 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 45 transitions. [2021-12-21 09:55:58,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-21 09:55:58,291 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:55:58,291 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:55:58,311 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-21 09:55:58,511 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:55:58,514 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:55:58,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:55:58,517 INFO L85 PathProgramCache]: Analyzing trace with hash 1613590512, now seen corresponding path program 1 times [2021-12-21 09:55:58,531 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:55:58,533 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1207699143] [2021-12-21 09:55:58,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:55:58,534 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:55:58,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:55:58,663 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-21 09:55:58,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:55:58,668 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-21 09:55:58,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:55:58,672 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 09:55:58,672 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:55:58,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1207699143] [2021-12-21 09:55:58,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1207699143] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:55:58,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1471802600] [2021-12-21 09:55:58,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:55:58,673 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:55:58,673 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:55:58,674 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) [2021-12-21 09:55:58,675 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-21 09:55:58,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:55:58,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-21 09:55:58,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:55:58,794 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-21 09:55:58,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 09:55:58,862 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-12-21 09:55:58,916 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-21 09:55:58,940 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 09:55:58,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:55:59,011 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-12-21 09:55:59,013 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 26 [2021-12-21 09:55:59,070 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 09:55:59,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1471802600] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:55:59,071 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:55:59,071 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 7] total 19 [2021-12-21 09:55:59,071 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908769396] [2021-12-21 09:55:59,071 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:55:59,071 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-12-21 09:55:59,072 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:55:59,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-12-21 09:55:59,072 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=279, Unknown=0, NotChecked=0, Total=342 [2021-12-21 09:55:59,072 INFO L87 Difference]: Start difference. First operand 36 states and 45 transitions. Second operand has 19 states, 19 states have (on average 2.526315789473684) internal successors, (48), 19 states have internal predecessors, (48), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-21 09:55:59,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:55:59,485 INFO L93 Difference]: Finished difference Result 116 states and 145 transitions. [2021-12-21 09:55:59,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-12-21 09:55:59,485 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.526315789473684) internal successors, (48), 19 states have internal predecessors, (48), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 25 [2021-12-21 09:55:59,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:55:59,487 INFO L225 Difference]: With dead ends: 116 [2021-12-21 09:55:59,487 INFO L226 Difference]: Without dead ends: 114 [2021-12-21 09:55:59,487 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 41 SyntacticMatches, 3 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 336 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=258, Invalid=1074, Unknown=0, NotChecked=0, Total=1332 [2021-12-21 09:55:59,488 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 88 mSDsluCounter, 332 mSDsCounter, 0 mSdLazyCounter, 389 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 375 SdHoareTripleChecker+Invalid, 476 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 389 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 28 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 09:55:59,488 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 375 Invalid, 476 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 389 Invalid, 0 Unknown, 28 Unchecked, 0.2s Time] [2021-12-21 09:55:59,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-12-21 09:55:59,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 51. [2021-12-21 09:55:59,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 40 states have (on average 1.275) internal successors, (51), 41 states have internal predecessors, (51), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-21 09:55:59,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 67 transitions. [2021-12-21 09:55:59,497 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 67 transitions. Word has length 25 [2021-12-21 09:55:59,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:55:59,497 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 67 transitions. [2021-12-21 09:55:59,497 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.526315789473684) internal successors, (48), 19 states have internal predecessors, (48), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-21 09:55:59,497 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 67 transitions. [2021-12-21 09:55:59,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-21 09:55:59,498 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:55:59,498 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:55:59,517 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-21 09:55:59,715 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-12-21 09:55:59,715 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:55:59,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:55:59,716 INFO L85 PathProgramCache]: Analyzing trace with hash 313438052, now seen corresponding path program 1 times [2021-12-21 09:55:59,716 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:55:59,716 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1562484524] [2021-12-21 09:55:59,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:55:59,716 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:55:59,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:55:59,811 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-21 09:55:59,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:55:59,817 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-21 09:55:59,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:55:59,820 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 09:55:59,820 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:55:59,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1562484524] [2021-12-21 09:55:59,821 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1562484524] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:55:59,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1411230004] [2021-12-21 09:55:59,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:55:59,821 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:55:59,821 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:55:59,822 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) [2021-12-21 09:55:59,823 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-21 09:55:59,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:55:59,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-21 09:55:59,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:55:59,931 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2021-12-21 09:55:59,991 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 09:55:59,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:56:00,039 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2021-12-21 09:56:00,047 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-12-21 09:56:00,079 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 09:56:00,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1411230004] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:56:00,080 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:56:00,080 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 7] total 13 [2021-12-21 09:56:00,080 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [223748092] [2021-12-21 09:56:00,080 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:56:00,081 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-21 09:56:00,081 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:56:00,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-21 09:56:00,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-12-21 09:56:00,082 INFO L87 Difference]: Start difference. First operand 51 states and 67 transitions. Second operand has 13 states, 13 states have (on average 3.3846153846153846) internal successors, (44), 13 states have internal predecessors, (44), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-21 09:56:00,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:56:00,247 INFO L93 Difference]: Finished difference Result 108 states and 142 transitions. [2021-12-21 09:56:00,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-21 09:56:00,247 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.3846153846153846) internal successors, (44), 13 states have internal predecessors, (44), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 29 [2021-12-21 09:56:00,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:56:00,248 INFO L225 Difference]: With dead ends: 108 [2021-12-21 09:56:00,248 INFO L226 Difference]: Without dead ends: 106 [2021-12-21 09:56:00,249 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 53 SyntacticMatches, 5 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=95, Invalid=247, Unknown=0, NotChecked=0, Total=342 [2021-12-21 09:56:00,249 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 50 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 09:56:00,250 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 200 Invalid, 225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 09:56:00,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-12-21 09:56:00,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 83. [2021-12-21 09:56:00,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 66 states have (on average 1.3181818181818181) internal successors, (87), 67 states have internal predecessors, (87), 14 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2021-12-21 09:56:00,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 115 transitions. [2021-12-21 09:56:00,260 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 115 transitions. Word has length 29 [2021-12-21 09:56:00,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:56:00,260 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 115 transitions. [2021-12-21 09:56:00,260 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 3.3846153846153846) internal successors, (44), 13 states have internal predecessors, (44), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-21 09:56:00,260 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 115 transitions. [2021-12-21 09:56:00,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-21 09:56:00,261 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:56:00,261 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:56:00,307 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-21 09:56:00,475 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:00,475 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:56:00,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:56:00,476 INFO L85 PathProgramCache]: Analyzing trace with hash 1014502630, now seen corresponding path program 1 times [2021-12-21 09:56:00,476 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:56:00,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1829401874] [2021-12-21 09:56:00,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:56:00,476 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:56:00,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:00,616 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-21 09:56:00,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:00,620 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-21 09:56:00,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:00,624 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 09:56:00,625 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:56:00,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1829401874] [2021-12-21 09:56:00,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1829401874] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:00,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2044346289] [2021-12-21 09:56:00,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:56:00,626 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:00,626 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:56:00,627 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) [2021-12-21 09:56:00,650 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-21 09:56:00,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:00,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-21 09:56:00,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:56:00,804 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-21 09:56:00,930 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-21 09:56:00,956 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 09:56:00,957 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:56:01,032 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2021-12-21 09:56:01,036 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-12-21 09:56:01,103 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 09:56:01,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2044346289] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:56:01,103 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:56:01,103 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 19 [2021-12-21 09:56:01,104 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470998275] [2021-12-21 09:56:01,104 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:56:01,105 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-12-21 09:56:01,105 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:56:01,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-12-21 09:56:01,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2021-12-21 09:56:01,106 INFO L87 Difference]: Start difference. First operand 83 states and 115 transitions. Second operand has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 3 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-21 09:56:01,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:56:01,654 INFO L93 Difference]: Finished difference Result 152 states and 203 transitions. [2021-12-21 09:56:01,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-12-21 09:56:01,654 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 3 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 29 [2021-12-21 09:56:01,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:56:01,655 INFO L225 Difference]: With dead ends: 152 [2021-12-21 09:56:01,655 INFO L226 Difference]: Without dead ends: 150 [2021-12-21 09:56:01,656 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=312, Invalid=1020, Unknown=0, NotChecked=0, Total=1332 [2021-12-21 09:56:01,657 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 141 mSDsluCounter, 214 mSDsCounter, 0 mSdLazyCounter, 284 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 257 SdHoareTripleChecker+Invalid, 390 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 284 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 09:56:01,657 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [141 Valid, 257 Invalid, 390 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 284 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 09:56:01,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-12-21 09:56:01,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 57. [2021-12-21 09:56:01,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 46 states have (on average 1.2608695652173914) internal successors, (58), 47 states have internal predecessors, (58), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-21 09:56:01,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 74 transitions. [2021-12-21 09:56:01,666 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 74 transitions. Word has length 29 [2021-12-21 09:56:01,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:56:01,667 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 74 transitions. [2021-12-21 09:56:01,667 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 3 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-21 09:56:01,667 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 74 transitions. [2021-12-21 09:56:01,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-12-21 09:56:01,668 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:56:01,668 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:56:01,687 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-12-21 09:56:01,883 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:01,883 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:56:01,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:56:01,884 INFO L85 PathProgramCache]: Analyzing trace with hash -1137782566, now seen corresponding path program 2 times [2021-12-21 09:56:01,884 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:56:01,884 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1717197365] [2021-12-21 09:56:01,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:56:01,884 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:56:01,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:02,058 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-21 09:56:02,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:02,065 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-21 09:56:02,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:02,068 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 09:56:02,068 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:56:02,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1717197365] [2021-12-21 09:56:02,068 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1717197365] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:02,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1494913827] [2021-12-21 09:56:02,068 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 09:56:02,069 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:02,069 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:56:02,070 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) [2021-12-21 09:56:02,071 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-21 09:56:02,115 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 09:56:02,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 09:56:02,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-21 09:56:02,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:56:02,366 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 09:56:02,366 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:56:02,501 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 09:56:02,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1494913827] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:56:02,501 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:56:02,502 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 9] total 24 [2021-12-21 09:56:02,502 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882725217] [2021-12-21 09:56:02,502 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:56:02,502 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-21 09:56:02,502 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:56:02,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-21 09:56:02,503 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=404, Unknown=0, NotChecked=0, Total=552 [2021-12-21 09:56:02,503 INFO L87 Difference]: Start difference. First operand 57 states and 74 transitions. Second operand has 24 states, 24 states have (on average 2.9166666666666665) internal successors, (70), 24 states have internal predecessors, (70), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-21 09:56:02,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:56:02,702 INFO L93 Difference]: Finished difference Result 104 states and 135 transitions. [2021-12-21 09:56:02,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-21 09:56:02,702 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.9166666666666665) internal successors, (70), 24 states have internal predecessors, (70), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 33 [2021-12-21 09:56:02,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:56:02,703 INFO L225 Difference]: With dead ends: 104 [2021-12-21 09:56:02,703 INFO L226 Difference]: Without dead ends: 88 [2021-12-21 09:56:02,704 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=236, Invalid=576, Unknown=0, NotChecked=0, Total=812 [2021-12-21 09:56:02,704 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 238 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 181 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 240 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 181 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 09:56:02,704 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [240 Valid, 96 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 181 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 09:56:02,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-12-21 09:56:02,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 66. [2021-12-21 09:56:02,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 54 states have (on average 1.2592592592592593) internal successors, (68), 54 states have internal predecessors, (68), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-21 09:56:02,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 86 transitions. [2021-12-21 09:56:02,712 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 86 transitions. Word has length 33 [2021-12-21 09:56:02,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:56:02,713 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 86 transitions. [2021-12-21 09:56:02,713 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.9166666666666665) internal successors, (70), 24 states have internal predecessors, (70), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-21 09:56:02,713 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 86 transitions. [2021-12-21 09:56:02,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-21 09:56:02,714 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:56:02,714 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:56:02,731 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-21 09:56:02,933 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:02,934 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:56:02,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:56:02,934 INFO L85 PathProgramCache]: Analyzing trace with hash 2068313767, now seen corresponding path program 2 times [2021-12-21 09:56:02,935 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:56:02,935 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1938108677] [2021-12-21 09:56:02,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:56:02,935 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:56:02,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:03,106 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-21 09:56:03,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:03,111 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-21 09:56:03,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:03,115 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-12-21 09:56:03,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:03,117 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-21 09:56:03,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:03,120 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-21 09:56:03,120 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:56:03,120 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1938108677] [2021-12-21 09:56:03,120 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1938108677] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:03,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [849869307] [2021-12-21 09:56:03,121 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 09:56:03,121 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:03,121 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:56:03,122 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) [2021-12-21 09:56:03,135 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-21 09:56:03,178 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 09:56:03,178 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 09:56:03,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-21 09:56:03,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:56:03,257 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-21 09:56:03,328 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 09:56:03,329 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2021-12-21 09:56:03,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 09:56:03,404 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 23 [2021-12-21 09:56:03,461 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 09:56:03,462 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 23 [2021-12-21 09:56:03,528 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-21 09:56:03,549 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 9 proven. 10 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-21 09:56:03,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:56:03,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [849869307] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:03,651 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 09:56:03,651 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 17 [2021-12-21 09:56:03,651 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1556644143] [2021-12-21 09:56:03,651 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 09:56:03,652 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-21 09:56:03,652 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:56:03,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-21 09:56:03,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=318, Unknown=0, NotChecked=0, Total=380 [2021-12-21 09:56:03,653 INFO L87 Difference]: Start difference. First operand 66 states and 86 transitions. Second operand has 17 states, 17 states have (on average 2.764705882352941) internal successors, (47), 17 states have internal predecessors, (47), 7 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2021-12-21 09:56:04,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:56:04,208 INFO L93 Difference]: Finished difference Result 99 states and 125 transitions. [2021-12-21 09:56:04,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-12-21 09:56:04,209 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.764705882352941) internal successors, (47), 17 states have internal predecessors, (47), 7 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) Word has length 39 [2021-12-21 09:56:04,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:56:04,210 INFO L225 Difference]: With dead ends: 99 [2021-12-21 09:56:04,210 INFO L226 Difference]: Without dead ends: 97 [2021-12-21 09:56:04,211 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 50 SyntacticMatches, 7 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 318 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=237, Invalid=1169, Unknown=0, NotChecked=0, Total=1406 [2021-12-21 09:56:04,211 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 99 mSDsluCounter, 293 mSDsCounter, 0 mSdLazyCounter, 393 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 336 SdHoareTripleChecker+Invalid, 529 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 393 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 37 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 09:56:04,212 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [99 Valid, 336 Invalid, 529 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 393 Invalid, 0 Unknown, 37 Unchecked, 0.2s Time] [2021-12-21 09:56:04,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-12-21 09:56:04,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 58. [2021-12-21 09:56:04,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 47 states have (on average 1.2127659574468086) internal successors, (57), 47 states have internal predecessors, (57), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-21 09:56:04,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 71 transitions. [2021-12-21 09:56:04,219 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 71 transitions. Word has length 39 [2021-12-21 09:56:04,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:56:04,219 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 71 transitions. [2021-12-21 09:56:04,219 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.764705882352941) internal successors, (47), 17 states have internal predecessors, (47), 7 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2021-12-21 09:56:04,219 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 71 transitions. [2021-12-21 09:56:04,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-21 09:56:04,220 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:56:04,220 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:56:04,250 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-21 09:56:04,438 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:04,438 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:56:04,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:56:04,439 INFO L85 PathProgramCache]: Analyzing trace with hash 513618191, now seen corresponding path program 3 times [2021-12-21 09:56:04,439 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:56:04,439 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [831044963] [2021-12-21 09:56:04,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:56:04,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:56:04,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:04,536 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-21 09:56:04,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:04,540 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-21 09:56:04,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:04,544 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-12-21 09:56:04,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:04,547 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-21 09:56:04,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:04,549 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-21 09:56:04,550 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:56:04,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [831044963] [2021-12-21 09:56:04,550 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [831044963] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:04,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2001911823] [2021-12-21 09:56:04,550 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 09:56:04,550 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:04,550 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:56:04,567 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) [2021-12-21 09:56:04,567 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-21 09:56:04,626 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-21 09:56:04,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 09:56:04,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 28 conjunts are in the unsatisfiable core [2021-12-21 09:56:04,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:56:04,705 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-21 09:56:04,772 INFO L353 Elim1Store]: treesize reduction 42, result has 22.2 percent of original size [2021-12-21 09:56:04,773 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 29 [2021-12-21 09:56:04,871 INFO L353 Elim1Store]: treesize reduction 14, result has 17.6 percent of original size [2021-12-21 09:56:04,872 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 46 treesize of output 24 [2021-12-21 09:56:04,895 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-21 09:56:04,896 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:56:04,958 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2021-12-21 09:56:04,960 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-12-21 09:56:05,009 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-21 09:56:05,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2001911823] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:56:05,009 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:56:05,010 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 13 [2021-12-21 09:56:05,010 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340861231] [2021-12-21 09:56:05,010 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:56:05,010 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-21 09:56:05,010 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:56:05,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-21 09:56:05,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-12-21 09:56:05,011 INFO L87 Difference]: Start difference. First operand 58 states and 71 transitions. Second operand has 13 states, 13 states have (on average 3.923076923076923) internal successors, (51), 13 states have internal predecessors, (51), 4 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-12-21 09:56:05,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:56:05,247 INFO L93 Difference]: Finished difference Result 158 states and 213 transitions. [2021-12-21 09:56:05,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-12-21 09:56:05,247 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.923076923076923) internal successors, (51), 13 states have internal predecessors, (51), 4 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 47 [2021-12-21 09:56:05,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:56:05,249 INFO L225 Difference]: With dead ends: 158 [2021-12-21 09:56:05,249 INFO L226 Difference]: Without dead ends: 156 [2021-12-21 09:56:05,249 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 92 SyntacticMatches, 8 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=100, Invalid=406, Unknown=0, NotChecked=0, Total=506 [2021-12-21 09:56:05,250 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 40 mSDsluCounter, 212 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 254 SdHoareTripleChecker+Invalid, 349 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 09:56:05,251 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 254 Invalid, 349 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 09:56:05,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-12-21 09:56:05,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 79. [2021-12-21 09:56:05,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 64 states have (on average 1.25) internal successors, (80), 64 states have internal predecessors, (80), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-12-21 09:56:05,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 102 transitions. [2021-12-21 09:56:05,274 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 102 transitions. Word has length 47 [2021-12-21 09:56:05,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:56:05,277 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 102 transitions. [2021-12-21 09:56:05,277 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 3.923076923076923) internal successors, (51), 13 states have internal predecessors, (51), 4 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-12-21 09:56:05,277 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 102 transitions. [2021-12-21 09:56:05,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-21 09:56:05,281 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:56:05,281 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:56:05,300 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-21 09:56:05,495 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:05,496 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:56:05,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:56:05,498 INFO L85 PathProgramCache]: Analyzing trace with hash 936320017, now seen corresponding path program 1 times [2021-12-21 09:56:05,499 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:56:05,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [624897119] [2021-12-21 09:56:05,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:56:05,499 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:56:05,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:05,636 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-21 09:56:05,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:05,641 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-21 09:56:05,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:05,644 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-12-21 09:56:05,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:05,649 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-21 09:56:05,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:05,654 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-21 09:56:05,654 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:56:05,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [624897119] [2021-12-21 09:56:05,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [624897119] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:05,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [746884436] [2021-12-21 09:56:05,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:56:05,655 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:05,655 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:56:05,656 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) [2021-12-21 09:56:05,657 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-21 09:56:05,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:05,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 21 conjunts are in the unsatisfiable core [2021-12-21 09:56:05,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:56:05,814 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-21 09:56:05,907 INFO L353 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-12-21 09:56:05,908 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-12-21 09:56:06,029 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-21 09:56:06,049 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 9 proven. 18 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-21 09:56:06,050 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:56:08,211 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2021-12-21 09:56:08,213 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-12-21 09:56:08,251 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [746884436] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:08,251 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 09:56:08,251 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2021-12-21 09:56:08,251 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348812387] [2021-12-21 09:56:08,251 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 09:56:08,252 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-21 09:56:08,252 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:56:08,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-21 09:56:08,252 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=518, Unknown=1, NotChecked=0, Total=600 [2021-12-21 09:56:08,252 INFO L87 Difference]: Start difference. First operand 79 states and 102 transitions. Second operand has 20 states, 20 states have (on average 3.15) internal successors, (63), 20 states have internal predecessors, (63), 6 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-12-21 09:56:08,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:56:08,900 INFO L93 Difference]: Finished difference Result 214 states and 285 transitions. [2021-12-21 09:56:08,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-12-21 09:56:08,900 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.15) internal successors, (63), 20 states have internal predecessors, (63), 6 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 47 [2021-12-21 09:56:08,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:56:08,902 INFO L225 Difference]: With dead ends: 214 [2021-12-21 09:56:08,902 INFO L226 Difference]: Without dead ends: 212 [2021-12-21 09:56:08,902 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 65 SyntacticMatches, 7 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 656 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=333, Invalid=1922, Unknown=1, NotChecked=0, Total=2256 [2021-12-21 09:56:08,903 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 153 mSDsluCounter, 369 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 154 SdHoareTripleChecker+Valid, 423 SdHoareTripleChecker+Invalid, 613 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 54 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 09:56:08,903 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [154 Valid, 423 Invalid, 613 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 462 Invalid, 0 Unknown, 54 Unchecked, 0.2s Time] [2021-12-21 09:56:08,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-12-21 09:56:08,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 101. [2021-12-21 09:56:08,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 80 states have (on average 1.275) internal successors, (102), 80 states have internal predecessors, (102), 15 states have call successors, (15), 5 states have call predecessors, (15), 5 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-12-21 09:56:08,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 132 transitions. [2021-12-21 09:56:08,916 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 132 transitions. Word has length 47 [2021-12-21 09:56:08,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:56:08,916 INFO L470 AbstractCegarLoop]: Abstraction has 101 states and 132 transitions. [2021-12-21 09:56:08,916 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.15) internal successors, (63), 20 states have internal predecessors, (63), 6 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-12-21 09:56:08,917 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 132 transitions. [2021-12-21 09:56:08,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-12-21 09:56:08,917 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:56:08,917 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:56:08,937 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-12-21 09:56:09,134 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-12-21 09:56:09,135 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:56:09,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:56:09,135 INFO L85 PathProgramCache]: Analyzing trace with hash 1147045125, now seen corresponding path program 4 times [2021-12-21 09:56:09,135 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:56:09,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1045048768] [2021-12-21 09:56:09,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:56:09,135 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:56:09,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:09,303 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-21 09:56:09,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:09,307 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-21 09:56:09,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:09,312 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-12-21 09:56:09,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:09,316 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-21 09:56:09,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:09,319 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-21 09:56:09,319 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:56:09,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1045048768] [2021-12-21 09:56:09,319 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1045048768] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:09,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [706785060] [2021-12-21 09:56:09,320 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 09:56:09,320 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:09,320 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:56:09,321 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) [2021-12-21 09:56:09,351 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-21 09:56:09,386 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 09:56:09,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 09:56:09,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-21 09:56:09,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:56:09,453 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-21 09:56:09,573 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-21 09:56:09,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:56:09,653 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2021-12-21 09:56:09,655 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-12-21 09:56:09,713 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-21 09:56:09,713 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [706785060] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:56:09,714 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:56:09,714 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 23 [2021-12-21 09:56:09,714 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851956875] [2021-12-21 09:56:09,714 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:56:09,715 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-21 09:56:09,715 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:56:09,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-21 09:56:09,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=422, Unknown=0, NotChecked=0, Total=506 [2021-12-21 09:56:09,716 INFO L87 Difference]: Start difference. First operand 101 states and 132 transitions. Second operand has 23 states, 23 states have (on average 3.608695652173913) internal successors, (83), 23 states have internal predecessors, (83), 4 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-12-21 09:56:10,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:56:10,308 INFO L93 Difference]: Finished difference Result 319 states and 448 transitions. [2021-12-21 09:56:10,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-12-21 09:56:10,309 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.608695652173913) internal successors, (83), 23 states have internal predecessors, (83), 4 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 51 [2021-12-21 09:56:10,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:56:10,311 INFO L225 Difference]: With dead ends: 319 [2021-12-21 09:56:10,311 INFO L226 Difference]: Without dead ends: 317 [2021-12-21 09:56:10,311 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 95 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 474 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=256, Invalid=1304, Unknown=0, NotChecked=0, Total=1560 [2021-12-21 09:56:10,312 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 104 mSDsluCounter, 380 mSDsCounter, 0 mSdLazyCounter, 702 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 440 SdHoareTripleChecker+Invalid, 795 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 702 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-21 09:56:10,312 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 440 Invalid, 795 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 702 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-21 09:56:10,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2021-12-21 09:56:10,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 187. [2021-12-21 09:56:10,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 148 states have (on average 1.3310810810810811) internal successors, (197), 148 states have internal predecessors, (197), 33 states have call successors, (33), 5 states have call predecessors, (33), 5 states have return successors, (33), 33 states have call predecessors, (33), 33 states have call successors, (33) [2021-12-21 09:56:10,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 263 transitions. [2021-12-21 09:56:10,334 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 263 transitions. Word has length 51 [2021-12-21 09:56:10,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:56:10,334 INFO L470 AbstractCegarLoop]: Abstraction has 187 states and 263 transitions. [2021-12-21 09:56:10,335 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 3.608695652173913) internal successors, (83), 23 states have internal predecessors, (83), 4 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-12-21 09:56:10,335 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 263 transitions. [2021-12-21 09:56:10,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-12-21 09:56:10,335 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:56:10,336 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:56:10,358 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-12-21 09:56:10,552 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-12-21 09:56:10,553 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:56:10,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:56:10,553 INFO L85 PathProgramCache]: Analyzing trace with hash -541898617, now seen corresponding path program 1 times [2021-12-21 09:56:10,553 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:56:10,553 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723466935] [2021-12-21 09:56:10,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:56:10,553 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:56:10,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:10,729 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-21 09:56:10,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:10,732 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-21 09:56:10,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:10,735 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-12-21 09:56:10,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:10,738 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-21 09:56:10,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:10,741 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-21 09:56:10,741 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:56:10,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723466935] [2021-12-21 09:56:10,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [723466935] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:10,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1584435482] [2021-12-21 09:56:10,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:56:10,742 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:10,742 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:56:10,756 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:56:10,768 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-21 09:56:10,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:10,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 21 conjunts are in the unsatisfiable core [2021-12-21 09:56:10,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:56:10,960 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-21 09:56:11,132 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-21 09:56:11,154 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-21 09:56:11,154 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:56:11,260 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2021-12-21 09:56:11,262 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-12-21 09:56:11,301 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1584435482] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:11,301 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 09:56:11,301 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2021-12-21 09:56:11,301 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1587658285] [2021-12-21 09:56:11,301 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 09:56:11,301 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-21 09:56:11,301 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:56:11,302 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-21 09:56:11,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2021-12-21 09:56:11,302 INFO L87 Difference]: Start difference. First operand 187 states and 263 transitions. Second operand has 20 states, 20 states have (on average 3.45) internal successors, (69), 20 states have internal predecessors, (69), 4 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-12-21 09:56:12,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:56:12,338 INFO L93 Difference]: Finished difference Result 325 states and 440 transitions. [2021-12-21 09:56:12,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-12-21 09:56:12,339 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.45) internal successors, (69), 20 states have internal predecessors, (69), 4 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 51 [2021-12-21 09:56:12,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:56:12,340 INFO L225 Difference]: With dead ends: 325 [2021-12-21 09:56:12,340 INFO L226 Difference]: Without dead ends: 323 [2021-12-21 09:56:12,341 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 594 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=425, Invalid=2331, Unknown=0, NotChecked=0, Total=2756 [2021-12-21 09:56:12,342 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 174 mSDsluCounter, 423 mSDsCounter, 0 mSdLazyCounter, 709 mSolverCounterSat, 149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 174 SdHoareTripleChecker+Valid, 480 SdHoareTripleChecker+Invalid, 858 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 149 IncrementalHoareTripleChecker+Valid, 709 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-21 09:56:12,342 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [174 Valid, 480 Invalid, 858 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [149 Valid, 709 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-21 09:56:12,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2021-12-21 09:56:12,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 115. [2021-12-21 09:56:12,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 94 states have (on average 1.2446808510638299) internal successors, (117), 94 states have internal predecessors, (117), 15 states have call successors, (15), 5 states have call predecessors, (15), 5 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-12-21 09:56:12,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 147 transitions. [2021-12-21 09:56:12,362 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 147 transitions. Word has length 51 [2021-12-21 09:56:12,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:56:12,362 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 147 transitions. [2021-12-21 09:56:12,362 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.45) internal successors, (69), 20 states have internal predecessors, (69), 4 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-12-21 09:56:12,363 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 147 transitions. [2021-12-21 09:56:12,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-12-21 09:56:12,363 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:56:12,364 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:56:12,380 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-12-21 09:56:12,580 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-12-21 09:56:12,581 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:56:12,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:56:12,581 INFO L85 PathProgramCache]: Analyzing trace with hash 1086909947, now seen corresponding path program 5 times [2021-12-21 09:56:12,581 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:56:12,581 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [829039294] [2021-12-21 09:56:12,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:56:12,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:56:12,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:12,819 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-21 09:56:12,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:12,823 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-21 09:56:12,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:12,825 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-12-21 09:56:12,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:12,827 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-21 09:56:12,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:12,830 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 19 proven. 23 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-21 09:56:12,830 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:56:12,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [829039294] [2021-12-21 09:56:12,830 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [829039294] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:12,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1935725969] [2021-12-21 09:56:12,830 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 09:56:12,830 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:12,831 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:56:12,831 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:56:12,832 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-21 09:56:12,913 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-12-21 09:56:12,913 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 09:56:12,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-21 09:56:12,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:56:13,323 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 32 proven. 10 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-21 09:56:13,323 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:56:13,557 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 32 proven. 10 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-21 09:56:13,557 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1935725969] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:56:13,557 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:56:13,557 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 12] total 34 [2021-12-21 09:56:13,557 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757697042] [2021-12-21 09:56:13,557 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:56:13,558 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-12-21 09:56:13,558 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:56:13,558 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-12-21 09:56:13,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=846, Unknown=0, NotChecked=0, Total=1122 [2021-12-21 09:56:13,559 INFO L87 Difference]: Start difference. First operand 115 states and 147 transitions. Second operand has 34 states, 34 states have (on average 3.323529411764706) internal successors, (113), 34 states have internal predecessors, (113), 6 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 6 states have call predecessors, (12), 6 states have call successors, (12) [2021-12-21 09:56:13,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:56:13,819 INFO L93 Difference]: Finished difference Result 179 states and 232 transitions. [2021-12-21 09:56:13,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-21 09:56:13,819 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 3.323529411764706) internal successors, (113), 34 states have internal predecessors, (113), 6 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 6 states have call predecessors, (12), 6 states have call successors, (12) Word has length 55 [2021-12-21 09:56:13,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:56:13,822 INFO L225 Difference]: With dead ends: 179 [2021-12-21 09:56:13,822 INFO L226 Difference]: Without dead ends: 155 [2021-12-21 09:56:13,823 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 97 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 520 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=438, Invalid=1202, Unknown=0, NotChecked=0, Total=1640 [2021-12-21 09:56:13,824 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 236 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 238 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 308 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 09:56:13,824 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [238 Valid, 123 Invalid, 308 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 223 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 09:56:13,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-12-21 09:56:13,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 125. [2021-12-21 09:56:13,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 102 states have (on average 1.2254901960784315) internal successors, (125), 102 states have internal predecessors, (125), 17 states have call successors, (17), 5 states have call predecessors, (17), 5 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-12-21 09:56:13,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 159 transitions. [2021-12-21 09:56:13,844 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 159 transitions. Word has length 55 [2021-12-21 09:56:13,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:56:13,844 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 159 transitions. [2021-12-21 09:56:13,845 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 3.323529411764706) internal successors, (113), 34 states have internal predecessors, (113), 6 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 6 states have call predecessors, (12), 6 states have call successors, (12) [2021-12-21 09:56:13,845 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 159 transitions. [2021-12-21 09:56:13,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-12-21 09:56:13,846 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:56:13,846 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:56:13,851 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-12-21 09:56:14,051 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-12-21 09:56:14,051 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:56:14,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:56:14,052 INFO L85 PathProgramCache]: Analyzing trace with hash -1543341178, now seen corresponding path program 2 times [2021-12-21 09:56:14,052 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:56:14,052 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902854227] [2021-12-21 09:56:14,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:56:14,052 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:56:14,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:14,165 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-21 09:56:14,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:14,170 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-21 09:56:14,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:14,173 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-12-21 09:56:14,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:14,175 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-21 09:56:14,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:14,177 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-12-21 09:56:14,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:14,179 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-12-21 09:56:14,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:14,181 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-12-21 09:56:14,181 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:56:14,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902854227] [2021-12-21 09:56:14,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [902854227] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:14,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1989353981] [2021-12-21 09:56:14,181 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 09:56:14,181 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:14,182 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:56:14,182 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:56:14,196 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-21 09:56:14,248 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 09:56:14,248 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 09:56:14,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 33 conjunts are in the unsatisfiable core [2021-12-21 09:56:14,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:56:14,299 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-21 09:56:14,334 INFO L353 Elim1Store]: treesize reduction 42, result has 22.2 percent of original size [2021-12-21 09:56:14,334 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 29 [2021-12-21 09:56:14,403 INFO L353 Elim1Store]: treesize reduction 42, result has 22.2 percent of original size [2021-12-21 09:56:14,403 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 29 [2021-12-21 09:56:14,456 INFO L353 Elim1Store]: treesize reduction 42, result has 22.2 percent of original size [2021-12-21 09:56:14,457 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 29 [2021-12-21 09:56:14,545 INFO L353 Elim1Store]: treesize reduction 14, result has 17.6 percent of original size [2021-12-21 09:56:14,545 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 46 treesize of output 24 [2021-12-21 09:56:14,561 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-12-21 09:56:14,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:56:14,712 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 21 [2021-12-21 09:56:14,714 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 36 [2021-12-21 09:56:14,783 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-12-21 09:56:14,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1989353981] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:56:14,784 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:56:14,784 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 11] total 16 [2021-12-21 09:56:14,784 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174454927] [2021-12-21 09:56:14,784 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:56:14,785 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-21 09:56:14,785 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:56:14,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-21 09:56:14,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-12-21 09:56:14,786 INFO L87 Difference]: Start difference. First operand 125 states and 159 transitions. Second operand has 16 states, 16 states have (on average 3.875) internal successors, (62), 16 states have internal predecessors, (62), 7 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2021-12-21 09:56:15,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:56:15,066 INFO L93 Difference]: Finished difference Result 192 states and 250 transitions. [2021-12-21 09:56:15,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-12-21 09:56:15,066 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.875) internal successors, (62), 16 states have internal predecessors, (62), 7 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) Word has length 61 [2021-12-21 09:56:15,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:56:15,067 INFO L225 Difference]: With dead ends: 192 [2021-12-21 09:56:15,067 INFO L226 Difference]: Without dead ends: 190 [2021-12-21 09:56:15,067 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 121 SyntacticMatches, 10 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=129, Invalid=573, Unknown=0, NotChecked=0, Total=702 [2021-12-21 09:56:15,068 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 48 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 346 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 337 SdHoareTripleChecker+Invalid, 480 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 346 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 102 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 09:56:15,068 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 337 Invalid, 480 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 346 Invalid, 0 Unknown, 102 Unchecked, 0.2s Time] [2021-12-21 09:56:15,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-12-21 09:56:15,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 147. [2021-12-21 09:56:15,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 118 states have (on average 1.2627118644067796) internal successors, (149), 118 states have internal predecessors, (149), 23 states have call successors, (23), 5 states have call predecessors, (23), 5 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2021-12-21 09:56:15,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 195 transitions. [2021-12-21 09:56:15,088 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 195 transitions. Word has length 61 [2021-12-21 09:56:15,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:56:15,089 INFO L470 AbstractCegarLoop]: Abstraction has 147 states and 195 transitions. [2021-12-21 09:56:15,089 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.875) internal successors, (62), 16 states have internal predecessors, (62), 7 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2021-12-21 09:56:15,089 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 195 transitions. [2021-12-21 09:56:15,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-12-21 09:56:15,090 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:56:15,090 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:56:15,109 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-12-21 09:56:15,310 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-12-21 09:56:15,310 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:56:15,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:56:15,311 INFO L85 PathProgramCache]: Analyzing trace with hash 1471762440, now seen corresponding path program 1 times [2021-12-21 09:56:15,311 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:56:15,311 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1631321189] [2021-12-21 09:56:15,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:56:15,311 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:56:15,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:15,423 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-21 09:56:15,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:15,426 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-21 09:56:15,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:15,427 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-12-21 09:56:15,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:15,430 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-21 09:56:15,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:15,432 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-12-21 09:56:15,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:15,434 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-12-21 09:56:15,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:15,436 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-12-21 09:56:15,436 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:56:15,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1631321189] [2021-12-21 09:56:15,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1631321189] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:15,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [898132308] [2021-12-21 09:56:15,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:56:15,437 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:15,437 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:56:15,438 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:56:15,439 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-12-21 09:56:15,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:15,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 27 conjunts are in the unsatisfiable core [2021-12-21 09:56:15,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:56:15,553 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-21 09:56:15,586 INFO L353 Elim1Store]: treesize reduction 42, result has 22.2 percent of original size [2021-12-21 09:56:15,587 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 29 [2021-12-21 09:56:15,662 INFO L353 Elim1Store]: treesize reduction 42, result has 22.2 percent of original size [2021-12-21 09:56:15,663 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 29 [2021-12-21 09:56:15,715 INFO L353 Elim1Store]: treesize reduction 42, result has 22.2 percent of original size [2021-12-21 09:56:15,715 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 29 [2021-12-21 09:56:15,796 INFO L353 Elim1Store]: treesize reduction 14, result has 17.6 percent of original size [2021-12-21 09:56:15,797 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 46 treesize of output 24 [2021-12-21 09:56:15,815 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-12-21 09:56:15,815 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:56:15,964 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 21 [2021-12-21 09:56:15,966 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 36 [2021-12-21 09:56:16,019 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-12-21 09:56:16,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [898132308] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:56:16,019 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:56:16,019 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 11] total 16 [2021-12-21 09:56:16,019 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138690066] [2021-12-21 09:56:16,020 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:56:16,020 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-21 09:56:16,020 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:56:16,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-21 09:56:16,020 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-12-21 09:56:16,020 INFO L87 Difference]: Start difference. First operand 147 states and 195 transitions. Second operand has 16 states, 16 states have (on average 3.875) internal successors, (62), 16 states have internal predecessors, (62), 7 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2021-12-21 09:56:16,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:56:16,308 INFO L93 Difference]: Finished difference Result 213 states and 277 transitions. [2021-12-21 09:56:16,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-12-21 09:56:16,309 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.875) internal successors, (62), 16 states have internal predecessors, (62), 7 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) Word has length 61 [2021-12-21 09:56:16,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:56:16,310 INFO L225 Difference]: With dead ends: 213 [2021-12-21 09:56:16,310 INFO L226 Difference]: Without dead ends: 211 [2021-12-21 09:56:16,310 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 122 SyntacticMatches, 10 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=129, Invalid=573, Unknown=0, NotChecked=0, Total=702 [2021-12-21 09:56:16,311 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 44 mSDsluCounter, 288 mSDsCounter, 0 mSdLazyCounter, 363 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 341 SdHoareTripleChecker+Invalid, 488 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 363 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 89 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 09:56:16,311 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 341 Invalid, 488 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 363 Invalid, 0 Unknown, 89 Unchecked, 0.2s Time] [2021-12-21 09:56:16,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-12-21 09:56:16,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 151. [2021-12-21 09:56:16,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 122 states have (on average 1.2704918032786885) internal successors, (155), 122 states have internal predecessors, (155), 23 states have call successors, (23), 5 states have call predecessors, (23), 5 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2021-12-21 09:56:16,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 201 transitions. [2021-12-21 09:56:16,336 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 201 transitions. Word has length 61 [2021-12-21 09:56:16,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:56:16,336 INFO L470 AbstractCegarLoop]: Abstraction has 151 states and 201 transitions. [2021-12-21 09:56:16,336 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.875) internal successors, (62), 16 states have internal predecessors, (62), 7 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2021-12-21 09:56:16,337 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 201 transitions. [2021-12-21 09:56:16,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-12-21 09:56:16,337 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:56:16,337 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:56:16,355 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-12-21 09:56:16,552 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-12-21 09:56:16,553 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:56:16,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:56:16,553 INFO L85 PathProgramCache]: Analyzing trace with hash 1484918790, now seen corresponding path program 3 times [2021-12-21 09:56:16,553 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:56:16,553 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1709882013] [2021-12-21 09:56:16,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:56:16,553 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:56:16,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:16,674 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-21 09:56:16,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:16,677 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-21 09:56:16,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:16,680 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-12-21 09:56:16,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:16,690 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-21 09:56:16,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:16,695 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-12-21 09:56:16,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:16,698 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-12-21 09:56:16,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:16,700 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-12-21 09:56:16,700 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:56:16,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1709882013] [2021-12-21 09:56:16,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1709882013] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:16,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2014016465] [2021-12-21 09:56:16,701 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 09:56:16,701 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:16,701 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:56:16,720 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:56:16,721 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-12-21 09:56:16,808 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-12-21 09:56:16,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 09:56:16,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 26 conjunts are in the unsatisfiable core [2021-12-21 09:56:16,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:56:16,949 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-21 09:56:17,034 INFO L353 Elim1Store]: treesize reduction 42, result has 22.2 percent of original size [2021-12-21 09:56:17,036 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 28 [2021-12-21 09:56:17,123 INFO L353 Elim1Store]: treesize reduction 33, result has 21.4 percent of original size [2021-12-21 09:56:17,123 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 25 [2021-12-21 09:56:17,174 INFO L353 Elim1Store]: treesize reduction 33, result has 21.4 percent of original size [2021-12-21 09:56:17,175 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 25 [2021-12-21 09:56:17,277 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-21 09:56:17,299 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 27 proven. 35 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-21 09:56:17,299 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:56:19,428 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2014016465] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:19,428 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 09:56:19,428 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 22 [2021-12-21 09:56:19,429 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293781932] [2021-12-21 09:56:19,429 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 09:56:19,429 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-12-21 09:56:19,432 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:56:19,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-12-21 09:56:19,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=597, Unknown=1, NotChecked=0, Total=702 [2021-12-21 09:56:19,433 INFO L87 Difference]: Start difference. First operand 151 states and 201 transitions. Second operand has 22 states, 22 states have (on average 3.409090909090909) internal successors, (75), 22 states have internal predecessors, (75), 9 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 9 states have call predecessors, (12), 9 states have call successors, (12) [2021-12-21 09:56:20,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:56:20,028 INFO L93 Difference]: Finished difference Result 222 states and 290 transitions. [2021-12-21 09:56:20,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-12-21 09:56:20,029 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.409090909090909) internal successors, (75), 22 states have internal predecessors, (75), 9 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 9 states have call predecessors, (12), 9 states have call successors, (12) Word has length 61 [2021-12-21 09:56:20,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:56:20,030 INFO L225 Difference]: With dead ends: 222 [2021-12-21 09:56:20,030 INFO L226 Difference]: Without dead ends: 220 [2021-12-21 09:56:20,032 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 78 SyntacticMatches, 8 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 818 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=366, Invalid=2183, Unknown=1, NotChecked=0, Total=2550 [2021-12-21 09:56:20,033 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 136 mSDsluCounter, 447 mSDsCounter, 0 mSdLazyCounter, 649 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 502 SdHoareTripleChecker+Invalid, 823 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 649 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 52 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-21 09:56:20,033 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [136 Valid, 502 Invalid, 823 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 649 Invalid, 0 Unknown, 52 Unchecked, 0.3s Time] [2021-12-21 09:56:20,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2021-12-21 09:56:20,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 101. [2021-12-21 09:56:20,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 81 states have (on average 1.2222222222222223) internal successors, (99), 81 states have internal predecessors, (99), 14 states have call successors, (14), 5 states have call predecessors, (14), 5 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-12-21 09:56:20,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 127 transitions. [2021-12-21 09:56:20,053 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 127 transitions. Word has length 61 [2021-12-21 09:56:20,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:56:20,053 INFO L470 AbstractCegarLoop]: Abstraction has 101 states and 127 transitions. [2021-12-21 09:56:20,053 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 3.409090909090909) internal successors, (75), 22 states have internal predecessors, (75), 9 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 9 states have call predecessors, (12), 9 states have call successors, (12) [2021-12-21 09:56:20,053 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 127 transitions. [2021-12-21 09:56:20,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-12-21 09:56:20,054 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:56:20,054 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:56:20,071 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2021-12-21 09:56:20,259 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:20,259 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:56:20,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:56:20,261 INFO L85 PathProgramCache]: Analyzing trace with hash -227276688, now seen corresponding path program 6 times [2021-12-21 09:56:20,261 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:56:20,261 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511294496] [2021-12-21 09:56:20,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:56:20,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:56:20,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:20,397 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-21 09:56:20,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:20,409 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-21 09:56:20,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:20,412 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-12-21 09:56:20,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:20,415 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-21 09:56:20,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:20,418 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-12-21 09:56:20,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:20,421 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-12-21 09:56:20,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:20,424 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 59 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-12-21 09:56:20,424 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:56:20,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511294496] [2021-12-21 09:56:20,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [511294496] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:20,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658223878] [2021-12-21 09:56:20,424 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 09:56:20,424 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:20,425 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:56:20,444 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:56:20,491 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-12-21 09:56:20,566 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-12-21 09:56:20,567 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 09:56:20,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 28 conjunts are in the unsatisfiable core [2021-12-21 09:56:20,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:56:20,663 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-21 09:56:20,695 INFO L353 Elim1Store]: treesize reduction 42, result has 22.2 percent of original size [2021-12-21 09:56:20,695 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 29 [2021-12-21 09:56:20,833 INFO L353 Elim1Store]: treesize reduction 14, result has 17.6 percent of original size [2021-12-21 09:56:20,834 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 46 treesize of output 24 [2021-12-21 09:56:20,851 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 59 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-12-21 09:56:20,851 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:56:20,934 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2021-12-21 09:56:20,936 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-12-21 09:56:21,023 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 59 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-12-21 09:56:21,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1658223878] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:56:21,024 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:56:21,024 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 18 [2021-12-21 09:56:21,024 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200994233] [2021-12-21 09:56:21,024 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:56:21,024 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-21 09:56:21,024 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:56:21,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-21 09:56:21,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-12-21 09:56:21,025 INFO L87 Difference]: Start difference. First operand 101 states and 127 transitions. Second operand has 18 states, 18 states have (on average 4.055555555555555) internal successors, (73), 18 states have internal predecessors, (73), 5 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-12-21 09:56:21,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:56:21,969 INFO L93 Difference]: Finished difference Result 552 states and 806 transitions. [2021-12-21 09:56:21,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-12-21 09:56:21,970 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 4.055555555555555) internal successors, (73), 18 states have internal predecessors, (73), 5 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 69 [2021-12-21 09:56:21,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:56:21,972 INFO L225 Difference]: With dead ends: 552 [2021-12-21 09:56:21,972 INFO L226 Difference]: Without dead ends: 550 [2021-12-21 09:56:21,973 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 138 SyntacticMatches, 8 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 717 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=319, Invalid=2131, Unknown=0, NotChecked=0, Total=2450 [2021-12-21 09:56:21,973 INFO L933 BasicCegarLoop]: 84 mSDtfsCounter, 131 mSDsluCounter, 430 mSDsCounter, 0 mSdLazyCounter, 960 mSolverCounterSat, 197 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 514 SdHoareTripleChecker+Invalid, 1157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 197 IncrementalHoareTripleChecker+Valid, 960 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-21 09:56:21,973 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 514 Invalid, 1157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [197 Valid, 960 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-21 09:56:21,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 550 states. [2021-12-21 09:56:22,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 550 to 163. [2021-12-21 09:56:22,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 128 states have (on average 1.3046875) internal successors, (167), 128 states have internal predecessors, (167), 29 states have call successors, (29), 5 states have call predecessors, (29), 5 states have return successors, (29), 29 states have call predecessors, (29), 29 states have call successors, (29) [2021-12-21 09:56:22,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 225 transitions. [2021-12-21 09:56:22,008 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 225 transitions. Word has length 69 [2021-12-21 09:56:22,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:56:22,008 INFO L470 AbstractCegarLoop]: Abstraction has 163 states and 225 transitions. [2021-12-21 09:56:22,008 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 4.055555555555555) internal successors, (73), 18 states have internal predecessors, (73), 5 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-12-21 09:56:22,008 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 225 transitions. [2021-12-21 09:56:22,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-12-21 09:56:22,009 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:56:22,009 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:56:22,031 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-12-21 09:56:22,226 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-12-21 09:56:22,226 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:56:22,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:56:22,227 INFO L85 PathProgramCache]: Analyzing trace with hash 1158926706, now seen corresponding path program 4 times [2021-12-21 09:56:22,227 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:56:22,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1477129249] [2021-12-21 09:56:22,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:56:22,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:56:22,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:22,364 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-21 09:56:22,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:22,367 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-21 09:56:22,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:22,371 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-12-21 09:56:22,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:22,373 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-21 09:56:22,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:22,375 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-12-21 09:56:22,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:22,378 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-12-21 09:56:22,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:22,380 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 59 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-12-21 09:56:22,380 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:56:22,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1477129249] [2021-12-21 09:56:22,380 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1477129249] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:22,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [524392034] [2021-12-21 09:56:22,381 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 09:56:22,381 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:22,381 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:56:22,396 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:56:22,404 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-12-21 09:56:22,455 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 09:56:22,455 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 09:56:22,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 27 conjunts are in the unsatisfiable core [2021-12-21 09:56:22,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:56:22,650 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-21 09:56:22,743 INFO L353 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-12-21 09:56:22,743 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-12-21 09:56:22,923 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-21 09:56:22,943 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 15 proven. 59 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-12-21 09:56:22,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:56:23,111 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2021-12-21 09:56:23,113 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-12-21 09:56:23,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [524392034] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:23,191 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 09:56:23,191 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2021-12-21 09:56:23,192 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1478049113] [2021-12-21 09:56:23,192 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 09:56:23,192 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-12-21 09:56:23,193 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:56:23,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-12-21 09:56:23,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=935, Unknown=0, NotChecked=0, Total=1056 [2021-12-21 09:56:23,194 INFO L87 Difference]: Start difference. First operand 163 states and 225 transitions. Second operand has 26 states, 26 states have (on average 3.5) internal successors, (91), 26 states have internal predecessors, (91), 8 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 8 states have call predecessors, (12), 8 states have call successors, (12) [2021-12-21 09:56:24,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:56:24,829 INFO L93 Difference]: Finished difference Result 697 states and 1004 transitions. [2021-12-21 09:56:24,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-12-21 09:56:24,830 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.5) internal successors, (91), 26 states have internal predecessors, (91), 8 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 8 states have call predecessors, (12), 8 states have call successors, (12) Word has length 69 [2021-12-21 09:56:24,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:56:24,832 INFO L225 Difference]: With dead ends: 697 [2021-12-21 09:56:24,832 INFO L226 Difference]: Without dead ends: 695 [2021-12-21 09:56:24,834 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 98 SyntacticMatches, 4 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3094 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=867, Invalid=7875, Unknown=0, NotChecked=0, Total=8742 [2021-12-21 09:56:24,834 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 332 mSDsluCounter, 707 mSDsCounter, 0 mSdLazyCounter, 1515 mSolverCounterSat, 399 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 337 SdHoareTripleChecker+Valid, 813 SdHoareTripleChecker+Invalid, 2029 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 399 IncrementalHoareTripleChecker+Valid, 1515 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 115 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-21 09:56:24,834 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [337 Valid, 813 Invalid, 2029 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [399 Valid, 1515 Invalid, 0 Unknown, 115 Unchecked, 0.7s Time] [2021-12-21 09:56:24,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 695 states. [2021-12-21 09:56:24,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 695 to 196. [2021-12-21 09:56:24,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 152 states have (on average 1.3157894736842106) internal successors, (200), 152 states have internal predecessors, (200), 35 states have call successors, (35), 8 states have call predecessors, (35), 8 states have return successors, (35), 35 states have call predecessors, (35), 35 states have call successors, (35) [2021-12-21 09:56:24,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 270 transitions. [2021-12-21 09:56:24,877 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 270 transitions. Word has length 69 [2021-12-21 09:56:24,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:56:24,877 INFO L470 AbstractCegarLoop]: Abstraction has 196 states and 270 transitions. [2021-12-21 09:56:24,877 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 3.5) internal successors, (91), 26 states have internal predecessors, (91), 8 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 8 states have call predecessors, (12), 8 states have call successors, (12) [2021-12-21 09:56:24,877 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 270 transitions. [2021-12-21 09:56:24,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-12-21 09:56:24,878 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:56:24,878 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:56:24,907 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2021-12-21 09:56:25,091 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-12-21 09:56:25,092 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:56:25,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:56:25,092 INFO L85 PathProgramCache]: Analyzing trace with hash 407421926, now seen corresponding path program 7 times [2021-12-21 09:56:25,092 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:56:25,093 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2079338752] [2021-12-21 09:56:25,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:56:25,093 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:56:25,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:25,221 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-21 09:56:25,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:25,224 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-21 09:56:25,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:25,228 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-12-21 09:56:25,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:25,231 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-21 09:56:25,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:25,233 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-12-21 09:56:25,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:25,235 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-12-21 09:56:25,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:25,238 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-12-21 09:56:25,238 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:56:25,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2079338752] [2021-12-21 09:56:25,238 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2079338752] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:25,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [338894925] [2021-12-21 09:56:25,238 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 09:56:25,238 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:25,239 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:56:25,240 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:56:25,271 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-12-21 09:56:25,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:25,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 28 conjunts are in the unsatisfiable core [2021-12-21 09:56:25,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:56:25,440 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-21 09:56:25,633 INFO L353 Elim1Store]: treesize reduction 14, result has 17.6 percent of original size [2021-12-21 09:56:25,633 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 46 treesize of output 24 [2021-12-21 09:56:25,652 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-12-21 09:56:25,653 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:56:25,733 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2021-12-21 09:56:25,734 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-12-21 09:56:25,842 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-12-21 09:56:25,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [338894925] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:56:25,842 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:56:25,842 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 20 [2021-12-21 09:56:25,843 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [215031869] [2021-12-21 09:56:25,843 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:56:25,843 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-21 09:56:25,843 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:56:25,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-21 09:56:25,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-12-21 09:56:25,844 INFO L87 Difference]: Start difference. First operand 196 states and 270 transitions. Second operand has 20 states, 20 states have (on average 3.9) internal successors, (78), 20 states have internal predecessors, (78), 3 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-21 09:56:28,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:56:28,114 INFO L93 Difference]: Finished difference Result 1725 states and 2618 transitions. [2021-12-21 09:56:28,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-12-21 09:56:28,115 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.9) internal successors, (78), 20 states have internal predecessors, (78), 3 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 73 [2021-12-21 09:56:28,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:56:28,121 INFO L225 Difference]: With dead ends: 1725 [2021-12-21 09:56:28,121 INFO L226 Difference]: Without dead ends: 1723 [2021-12-21 09:56:28,123 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 145 SyntacticMatches, 7 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2523 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=786, Invalid=6354, Unknown=0, NotChecked=0, Total=7140 [2021-12-21 09:56:28,123 INFO L933 BasicCegarLoop]: 151 mSDtfsCounter, 192 mSDsluCounter, 920 mSDsCounter, 0 mSdLazyCounter, 2176 mSolverCounterSat, 363 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 200 SdHoareTripleChecker+Valid, 1071 SdHoareTripleChecker+Invalid, 2539 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 363 IncrementalHoareTripleChecker+Valid, 2176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-12-21 09:56:28,123 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [200 Valid, 1071 Invalid, 2539 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [363 Valid, 2176 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-12-21 09:56:28,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1723 states. [2021-12-21 09:56:28,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1723 to 406. [2021-12-21 09:56:28,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 406 states, 314 states have (on average 1.375796178343949) internal successors, (432), 314 states have internal predecessors, (432), 83 states have call successors, (83), 8 states have call predecessors, (83), 8 states have return successors, (83), 83 states have call predecessors, (83), 83 states have call successors, (83) [2021-12-21 09:56:28,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 406 states to 406 states and 598 transitions. [2021-12-21 09:56:28,236 INFO L78 Accepts]: Start accepts. Automaton has 406 states and 598 transitions. Word has length 73 [2021-12-21 09:56:28,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:56:28,237 INFO L470 AbstractCegarLoop]: Abstraction has 406 states and 598 transitions. [2021-12-21 09:56:28,237 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.9) internal successors, (78), 20 states have internal predecessors, (78), 3 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-21 09:56:28,237 INFO L276 IsEmpty]: Start isEmpty. Operand 406 states and 598 transitions. [2021-12-21 09:56:28,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-12-21 09:56:28,239 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:56:28,239 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:56:28,274 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2021-12-21 09:56:28,456 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-12-21 09:56:28,456 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:56:28,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:56:28,457 INFO L85 PathProgramCache]: Analyzing trace with hash -1964317336, now seen corresponding path program 2 times [2021-12-21 09:56:28,457 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:56:28,457 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2056445015] [2021-12-21 09:56:28,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:56:28,457 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:56:28,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:28,592 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-21 09:56:28,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:28,614 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-21 09:56:28,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:28,616 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-12-21 09:56:28,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:28,618 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-21 09:56:28,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:28,623 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-12-21 09:56:28,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:28,625 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-12-21 09:56:28,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:28,627 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-12-21 09:56:28,627 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:56:28,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2056445015] [2021-12-21 09:56:28,628 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2056445015] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:28,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [737050960] [2021-12-21 09:56:28,628 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 09:56:28,628 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:28,628 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:56:28,629 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:56:28,659 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-12-21 09:56:28,719 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 09:56:28,719 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 09:56:28,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 27 conjunts are in the unsatisfiable core [2021-12-21 09:56:28,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:56:28,886 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-21 09:56:29,138 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-21 09:56:29,163 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-12-21 09:56:29,163 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:56:29,341 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2021-12-21 09:56:29,343 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-12-21 09:56:29,386 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [737050960] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:29,386 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 09:56:29,386 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 27 [2021-12-21 09:56:29,386 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828233204] [2021-12-21 09:56:29,386 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 09:56:29,387 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-21 09:56:29,387 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:56:29,387 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-21 09:56:29,387 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1073, Unknown=0, NotChecked=0, Total=1190 [2021-12-21 09:56:29,387 INFO L87 Difference]: Start difference. First operand 406 states and 598 transitions. Second operand has 27 states, 27 states have (on average 3.5925925925925926) internal successors, (97), 27 states have internal predecessors, (97), 6 states have call successors, (12), 1 states have call predecessors, (12), 1 states have return successors, (12), 6 states have call predecessors, (12), 6 states have call successors, (12) [2021-12-21 09:56:31,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:56:31,981 INFO L93 Difference]: Finished difference Result 1238 states and 1848 transitions. [2021-12-21 09:56:31,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-12-21 09:56:31,982 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.5925925925925926) internal successors, (97), 27 states have internal predecessors, (97), 6 states have call successors, (12), 1 states have call predecessors, (12), 1 states have return successors, (12), 6 states have call predecessors, (12), 6 states have call successors, (12) Word has length 73 [2021-12-21 09:56:31,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:56:31,985 INFO L225 Difference]: With dead ends: 1238 [2021-12-21 09:56:31,986 INFO L226 Difference]: Without dead ends: 1236 [2021-12-21 09:56:31,988 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2899 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1163, Invalid=8539, Unknown=0, NotChecked=0, Total=9702 [2021-12-21 09:56:31,988 INFO L933 BasicCegarLoop]: 89 mSDtfsCounter, 268 mSDsluCounter, 723 mSDsCounter, 0 mSdLazyCounter, 1575 mSolverCounterSat, 417 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 268 SdHoareTripleChecker+Valid, 812 SdHoareTripleChecker+Invalid, 1992 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 417 IncrementalHoareTripleChecker+Valid, 1575 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-21 09:56:31,989 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [268 Valid, 812 Invalid, 1992 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [417 Valid, 1575 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-12-21 09:56:31,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1236 states. [2021-12-21 09:56:32,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1236 to 218. [2021-12-21 09:56:32,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 174 states have (on average 1.2816091954022988) internal successors, (223), 174 states have internal predecessors, (223), 35 states have call successors, (35), 8 states have call predecessors, (35), 8 states have return successors, (35), 35 states have call predecessors, (35), 35 states have call successors, (35) [2021-12-21 09:56:32,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 293 transitions. [2021-12-21 09:56:32,055 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 293 transitions. Word has length 73 [2021-12-21 09:56:32,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:56:32,055 INFO L470 AbstractCegarLoop]: Abstraction has 218 states and 293 transitions. [2021-12-21 09:56:32,056 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 3.5925925925925926) internal successors, (97), 27 states have internal predecessors, (97), 6 states have call successors, (12), 1 states have call predecessors, (12), 1 states have return successors, (12), 6 states have call predecessors, (12), 6 states have call successors, (12) [2021-12-21 09:56:32,056 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 293 transitions. [2021-12-21 09:56:32,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-12-21 09:56:32,056 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:56:32,057 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:56:32,099 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-12-21 09:56:32,278 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:32,279 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:56:32,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:56:32,279 INFO L85 PathProgramCache]: Analyzing trace with hash -2050567076, now seen corresponding path program 8 times [2021-12-21 09:56:32,279 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:56:32,279 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1077783838] [2021-12-21 09:56:32,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:56:32,279 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:56:32,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:32,638 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-21 09:56:32,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:32,641 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-21 09:56:32,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:32,643 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-12-21 09:56:32,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:32,644 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-21 09:56:32,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:32,647 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-12-21 09:56:32,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:32,649 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-12-21 09:56:32,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:32,651 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 51 proven. 48 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-12-21 09:56:32,651 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:56:32,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1077783838] [2021-12-21 09:56:32,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1077783838] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:32,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1220679832] [2021-12-21 09:56:32,652 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 09:56:32,652 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:32,652 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:56:32,664 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:56:32,699 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-12-21 09:56:32,774 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 09:56:32,775 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 09:56:32,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 15 conjunts are in the unsatisfiable core [2021-12-21 09:56:32,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:56:33,414 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 72 proven. 27 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-12-21 09:56:33,414 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:56:33,764 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 72 proven. 27 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-12-21 09:56:33,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1220679832] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:56:33,764 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:56:33,764 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 15] total 43 [2021-12-21 09:56:33,764 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1539591082] [2021-12-21 09:56:33,764 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:56:33,765 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-12-21 09:56:33,765 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:56:33,765 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-12-21 09:56:33,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=428, Invalid=1378, Unknown=0, NotChecked=0, Total=1806 [2021-12-21 09:56:33,766 INFO L87 Difference]: Start difference. First operand 218 states and 293 transitions. Second operand has 43 states, 43 states have (on average 3.604651162790698) internal successors, (155), 43 states have internal predecessors, (155), 9 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (18), 9 states have call predecessors, (18), 9 states have call successors, (18) [2021-12-21 09:56:34,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:56:34,171 INFO L93 Difference]: Finished difference Result 298 states and 400 transitions. [2021-12-21 09:56:34,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-21 09:56:34,171 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 3.604651162790698) internal successors, (155), 43 states have internal predecessors, (155), 9 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (18), 9 states have call predecessors, (18), 9 states have call successors, (18) Word has length 77 [2021-12-21 09:56:34,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:56:34,173 INFO L225 Difference]: With dead ends: 298 [2021-12-21 09:56:34,173 INFO L226 Difference]: Without dead ends: 266 [2021-12-21 09:56:34,174 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 139 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 902 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=642, Invalid=1908, Unknown=0, NotChecked=0, Total=2550 [2021-12-21 09:56:34,174 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 255 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 348 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 257 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 455 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 348 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 09:56:34,174 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [257 Valid, 180 Invalid, 455 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 348 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 09:56:34,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2021-12-21 09:56:34,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 233. [2021-12-21 09:56:34,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 186 states have (on average 1.2634408602150538) internal successors, (235), 186 states have internal predecessors, (235), 38 states have call successors, (38), 8 states have call predecessors, (38), 8 states have return successors, (38), 38 states have call predecessors, (38), 38 states have call successors, (38) [2021-12-21 09:56:34,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 311 transitions. [2021-12-21 09:56:34,237 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 311 transitions. Word has length 77 [2021-12-21 09:56:34,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:56:34,237 INFO L470 AbstractCegarLoop]: Abstraction has 233 states and 311 transitions. [2021-12-21 09:56:34,237 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 3.604651162790698) internal successors, (155), 43 states have internal predecessors, (155), 9 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (18), 9 states have call predecessors, (18), 9 states have call successors, (18) [2021-12-21 09:56:34,238 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 311 transitions. [2021-12-21 09:56:34,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-12-21 09:56:34,238 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:56:34,239 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:56:34,257 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-12-21 09:56:34,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:34,457 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:56:34,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:56:34,457 INFO L85 PathProgramCache]: Analyzing trace with hash -949126895, now seen corresponding path program 9 times [2021-12-21 09:56:34,457 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:56:34,458 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2052497761] [2021-12-21 09:56:34,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:56:34,458 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:56:34,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:34,607 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-21 09:56:34,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:34,610 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-21 09:56:34,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:34,611 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-12-21 09:56:34,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:34,613 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-21 09:56:34,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:34,615 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-12-21 09:56:34,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:34,618 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-12-21 09:56:34,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:34,620 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2021-12-21 09:56:34,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:34,623 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-12-21 09:56:34,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:34,626 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 0 proven. 124 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-12-21 09:56:34,626 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:56:34,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2052497761] [2021-12-21 09:56:34,626 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2052497761] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:34,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [73049728] [2021-12-21 09:56:34,626 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 09:56:34,627 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:34,627 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:56:34,639 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:56:34,660 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-12-21 09:56:34,808 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-12-21 09:56:34,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 09:56:34,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 40 conjunts are in the unsatisfiable core [2021-12-21 09:56:34,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:56:34,945 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-21 09:56:34,978 INFO L353 Elim1Store]: treesize reduction 42, result has 22.2 percent of original size [2021-12-21 09:56:34,979 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 29 [2021-12-21 09:56:35,229 INFO L353 Elim1Store]: treesize reduction 14, result has 17.6 percent of original size [2021-12-21 09:56:35,229 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 46 treesize of output 24 [2021-12-21 09:56:35,251 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 0 proven. 124 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-12-21 09:56:35,251 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:56:35,354 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2021-12-21 09:56:35,355 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-12-21 09:56:35,475 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 0 proven. 124 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-12-21 09:56:35,475 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [73049728] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:56:35,476 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:56:35,476 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 23 [2021-12-21 09:56:35,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912830751] [2021-12-21 09:56:35,476 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:56:35,476 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-21 09:56:35,476 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:56:35,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-21 09:56:35,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-12-21 09:56:35,477 INFO L87 Difference]: Start difference. First operand 233 states and 311 transitions. Second operand has 23 states, 23 states have (on average 4.130434782608695) internal successors, (95), 23 states have internal predecessors, (95), 6 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) [2021-12-21 09:56:40,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:56:40,284 INFO L93 Difference]: Finished difference Result 3600 states and 5511 transitions. [2021-12-21 09:56:40,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2021-12-21 09:56:40,285 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 4.130434782608695) internal successors, (95), 23 states have internal predecessors, (95), 6 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) Word has length 91 [2021-12-21 09:56:40,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:56:40,296 INFO L225 Difference]: With dead ends: 3600 [2021-12-21 09:56:40,297 INFO L226 Difference]: Without dead ends: 3598 [2021-12-21 09:56:40,300 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 184 SyntacticMatches, 8 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8611 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1914, Invalid=19548, Unknown=0, NotChecked=0, Total=21462 [2021-12-21 09:56:40,300 INFO L933 BasicCegarLoop]: 248 mSDtfsCounter, 191 mSDsluCounter, 1268 mSDsCounter, 0 mSdLazyCounter, 3987 mSolverCounterSat, 583 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 203 SdHoareTripleChecker+Valid, 1516 SdHoareTripleChecker+Invalid, 4570 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 583 IncrementalHoareTripleChecker+Valid, 3987 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-12-21 09:56:40,301 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [203 Valid, 1516 Invalid, 4570 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [583 Valid, 3987 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-12-21 09:56:40,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3598 states. [2021-12-21 09:56:40,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3598 to 458. [2021-12-21 09:56:40,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 458 states, 360 states have (on average 1.3472222222222223) internal successors, (485), 360 states have internal predecessors, (485), 89 states have call successors, (89), 8 states have call predecessors, (89), 8 states have return successors, (89), 89 states have call predecessors, (89), 89 states have call successors, (89) [2021-12-21 09:56:40,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 458 states to 458 states and 663 transitions. [2021-12-21 09:56:40,496 INFO L78 Accepts]: Start accepts. Automaton has 458 states and 663 transitions. Word has length 91 [2021-12-21 09:56:40,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:56:40,496 INFO L470 AbstractCegarLoop]: Abstraction has 458 states and 663 transitions. [2021-12-21 09:56:40,497 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 4.130434782608695) internal successors, (95), 23 states have internal predecessors, (95), 6 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) [2021-12-21 09:56:40,497 INFO L276 IsEmpty]: Start isEmpty. Operand 458 states and 663 transitions. [2021-12-21 09:56:40,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-12-21 09:56:40,498 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:56:40,498 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:56:40,523 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-12-21 09:56:40,717 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-12-21 09:56:40,718 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:56:40,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:56:40,718 INFO L85 PathProgramCache]: Analyzing trace with hash -289595373, now seen corresponding path program 5 times [2021-12-21 09:56:40,718 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:56:40,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [14502439] [2021-12-21 09:56:40,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:56:40,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:56:40,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:40,907 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-21 09:56:40,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:40,910 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-21 09:56:40,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:40,912 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-12-21 09:56:40,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:40,915 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-21 09:56:40,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:40,923 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-12-21 09:56:40,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:40,926 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-12-21 09:56:40,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:40,929 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2021-12-21 09:56:40,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:40,930 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-12-21 09:56:40,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:40,936 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 0 proven. 124 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-12-21 09:56:40,936 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:56:40,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [14502439] [2021-12-21 09:56:40,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [14502439] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:40,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1249179232] [2021-12-21 09:56:40,937 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 09:56:40,937 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:40,937 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:56:40,938 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:56:40,940 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-12-21 09:56:41,041 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-12-21 09:56:41,041 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 09:56:41,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 33 conjunts are in the unsatisfiable core [2021-12-21 09:56:41,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:56:41,303 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-21 09:56:41,378 INFO L353 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-12-21 09:56:41,378 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-12-21 09:56:41,660 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-21 09:56:41,687 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 21 proven. 124 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-12-21 09:56:41,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:56:43,928 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2021-12-21 09:56:43,930 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-12-21 09:56:43,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1249179232] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:43,972 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 09:56:43,972 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 32 [2021-12-21 09:56:43,972 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336923901] [2021-12-21 09:56:43,972 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 09:56:43,972 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-12-21 09:56:43,972 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:56:43,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-12-21 09:56:43,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=1484, Unknown=1, NotChecked=0, Total=1640 [2021-12-21 09:56:43,973 INFO L87 Difference]: Start difference. First operand 458 states and 663 transitions. Second operand has 32 states, 32 states have (on average 3.71875) internal successors, (119), 32 states have internal predecessors, (119), 10 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 10 states have call predecessors, (16), 10 states have call successors, (16) [2021-12-21 09:56:48,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:56:48,595 INFO L93 Difference]: Finished difference Result 1812 states and 2691 transitions. [2021-12-21 09:56:48,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-12-21 09:56:48,597 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.71875) internal successors, (119), 32 states have internal predecessors, (119), 10 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 10 states have call predecessors, (16), 10 states have call successors, (16) Word has length 91 [2021-12-21 09:56:48,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:56:48,602 INFO L225 Difference]: With dead ends: 1812 [2021-12-21 09:56:48,602 INFO L226 Difference]: Without dead ends: 1810 [2021-12-21 09:56:48,603 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 128 SyntacticMatches, 4 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5315 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=1117, Invalid=13401, Unknown=2, NotChecked=0, Total=14520 [2021-12-21 09:56:48,604 INFO L933 BasicCegarLoop]: 139 mSDtfsCounter, 390 mSDsluCounter, 1120 mSDsCounter, 0 mSdLazyCounter, 2228 mSolverCounterSat, 546 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 394 SdHoareTripleChecker+Valid, 1259 SdHoareTripleChecker+Invalid, 2938 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 546 IncrementalHoareTripleChecker+Valid, 2228 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 164 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-12-21 09:56:48,604 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [394 Valid, 1259 Invalid, 2938 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [546 Valid, 2228 Invalid, 0 Unknown, 164 Unchecked, 0.9s Time] [2021-12-21 09:56:48,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1810 states. [2021-12-21 09:56:48,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1810 to 443. [2021-12-21 09:56:48,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 443 states, 348 states have (on average 1.3333333333333333) internal successors, (464), 348 states have internal predecessors, (464), 83 states have call successors, (83), 11 states have call predecessors, (83), 11 states have return successors, (83), 83 states have call predecessors, (83), 83 states have call successors, (83) [2021-12-21 09:56:48,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 443 states to 443 states and 630 transitions. [2021-12-21 09:56:48,774 INFO L78 Accepts]: Start accepts. Automaton has 443 states and 630 transitions. Word has length 91 [2021-12-21 09:56:48,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:56:48,775 INFO L470 AbstractCegarLoop]: Abstraction has 443 states and 630 transitions. [2021-12-21 09:56:48,775 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 3.71875) internal successors, (119), 32 states have internal predecessors, (119), 10 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (16), 10 states have call predecessors, (16), 10 states have call successors, (16) [2021-12-21 09:56:48,775 INFO L276 IsEmpty]: Start isEmpty. Operand 443 states and 630 transitions. [2021-12-21 09:56:48,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-12-21 09:56:48,776 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:56:48,776 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:56:48,802 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-12-21 09:56:49,000 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-12-21 09:56:49,000 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:56:49,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:56:49,001 INFO L85 PathProgramCache]: Analyzing trace with hash -68748281, now seen corresponding path program 10 times [2021-12-21 09:56:49,001 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:56:49,001 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1294068168] [2021-12-21 09:56:49,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:56:49,001 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:56:49,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:49,163 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-21 09:56:49,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:49,166 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-21 09:56:49,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:49,168 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-12-21 09:56:49,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:49,169 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-21 09:56:49,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:49,171 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-12-21 09:56:49,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:49,173 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-12-21 09:56:49,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:49,175 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2021-12-21 09:56:49,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:49,181 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-12-21 09:56:49,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:56:49,183 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 150 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-12-21 09:56:49,183 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:56:49,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1294068168] [2021-12-21 09:56:49,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1294068168] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:56:49,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1912038577] [2021-12-21 09:56:49,184 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 09:56:49,184 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:56:49,184 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:56:49,185 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:56:49,186 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-12-21 09:56:49,254 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 09:56:49,255 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 09:56:49,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 34 conjunts are in the unsatisfiable core [2021-12-21 09:56:49,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:56:49,365 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-12-21 09:56:49,647 INFO L353 Elim1Store]: treesize reduction 14, result has 17.6 percent of original size [2021-12-21 09:56:49,647 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 46 treesize of output 24 [2021-12-21 09:56:49,665 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 150 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-12-21 09:56:49,666 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:56:49,746 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2021-12-21 09:56:49,747 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-12-21 09:56:49,877 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 150 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-12-21 09:56:49,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1912038577] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:56:49,877 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:56:49,877 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 25 [2021-12-21 09:56:49,877 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791998767] [2021-12-21 09:56:49,877 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:56:49,878 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-12-21 09:56:49,878 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:56:49,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-12-21 09:56:49,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-12-21 09:56:49,879 INFO L87 Difference]: Start difference. First operand 443 states and 630 transitions. Second operand has 25 states, 25 states have (on average 4.0) internal successors, (100), 25 states have internal predecessors, (100), 4 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-12-21 09:57:01,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:57:01,630 INFO L93 Difference]: Finished difference Result 12950 states and 20137 transitions. [2021-12-21 09:57:01,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 262 states. [2021-12-21 09:57:01,631 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 4.0) internal successors, (100), 25 states have internal predecessors, (100), 4 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 95 [2021-12-21 09:57:01,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:57:01,684 INFO L225 Difference]: With dead ends: 12950 [2021-12-21 09:57:01,685 INFO L226 Difference]: Without dead ends: 12948 [2021-12-21 09:57:01,692 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 465 GetRequests, 191 SyntacticMatches, 7 SemanticMatches, 267 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32066 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=5151, Invalid=66941, Unknown=0, NotChecked=0, Total=72092 [2021-12-21 09:57:01,694 INFO L933 BasicCegarLoop]: 429 mSDtfsCounter, 427 mSDsluCounter, 2303 mSDsCounter, 0 mSdLazyCounter, 7857 mSolverCounterSat, 1393 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 439 SdHoareTripleChecker+Valid, 2732 SdHoareTripleChecker+Invalid, 9250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1393 IncrementalHoareTripleChecker+Valid, 7857 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2021-12-21 09:57:01,695 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [439 Valid, 2732 Invalid, 9250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1393 Valid, 7857 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2021-12-21 09:57:01,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12948 states. [2021-12-21 09:57:02,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12948 to 1173. [2021-12-21 09:57:02,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1173 states, 904 states have (on average 1.4092920353982301) internal successors, (1274), 904 states have internal predecessors, (1274), 257 states have call successors, (257), 11 states have call predecessors, (257), 11 states have return successors, (257), 257 states have call predecessors, (257), 257 states have call successors, (257) [2021-12-21 09:57:02,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1173 states to 1173 states and 1788 transitions. [2021-12-21 09:57:02,361 INFO L78 Accepts]: Start accepts. Automaton has 1173 states and 1788 transitions. Word has length 95 [2021-12-21 09:57:02,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:57:02,361 INFO L470 AbstractCegarLoop]: Abstraction has 1173 states and 1788 transitions. [2021-12-21 09:57:02,362 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 4.0) internal successors, (100), 25 states have internal predecessors, (100), 4 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-12-21 09:57:02,362 INFO L276 IsEmpty]: Start isEmpty. Operand 1173 states and 1788 transitions. [2021-12-21 09:57:02,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-12-21 09:57:02,364 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:57:02,364 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:57:02,390 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-12-21 09:57:02,579 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:57:02,579 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:57:02,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:57:02,580 INFO L85 PathProgramCache]: Analyzing trace with hash -912753783, now seen corresponding path program 3 times [2021-12-21 09:57:02,580 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:57:02,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1857325191] [2021-12-21 09:57:02,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:57:02,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:57:02,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:57:02,762 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-21 09:57:02,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:57:02,764 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-21 09:57:02,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:57:02,766 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-12-21 09:57:02,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:57:02,768 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-21 09:57:02,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:57:02,769 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-12-21 09:57:02,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:57:02,771 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-12-21 09:57:02,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:57:02,773 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2021-12-21 09:57:02,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:57:02,775 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-12-21 09:57:02,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:57:02,777 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 150 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-12-21 09:57:02,777 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:57:02,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1857325191] [2021-12-21 09:57:02,777 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1857325191] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:57:02,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1405352070] [2021-12-21 09:57:02,778 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 09:57:02,778 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:57:02,778 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:57:02,792 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:57:02,792 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-12-21 09:57:02,991 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-12-21 09:57:02,991 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 09:57:02,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 343 conjuncts, 33 conjunts are in the unsatisfiable core [2021-12-21 09:57:02,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:57:03,274 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-21 09:57:03,623 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-21 09:57:03,652 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 150 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-12-21 09:57:03,652 INFO L328 TraceCheckSpWp]: Computing backward predicates...