./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/array-crafted/zero_sum_const2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b 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-crafted/zero_sum_const2.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 1be1405ed24182ea691f06aafa4c0ada74bba78ab2a6f90fefc65156bb70df6c --- Real Ultimate output --- This is Ultimate 0.2.2-839c364b5d67a0f615c82cb70ab247790648d4a9-839c364 [2021-12-14 11:25:23,253 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-14 11:25:23,254 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-14 11:25:23,317 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-14 11:25:23,318 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-14 11:25:23,320 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-14 11:25:23,321 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-14 11:25:23,323 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-14 11:25:23,324 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-14 11:25:23,327 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-14 11:25:23,328 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-14 11:25:23,329 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-14 11:25:23,329 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-14 11:25:23,331 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-14 11:25:23,332 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-14 11:25:23,334 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-14 11:25:23,335 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-14 11:25:23,335 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-14 11:25:23,337 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-14 11:25:23,341 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-14 11:25:23,342 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-14 11:25:23,343 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-14 11:25:23,344 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-14 11:25:23,344 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-14 11:25:23,349 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-14 11:25:23,349 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-14 11:25:23,349 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-14 11:25:23,350 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-14 11:25:23,350 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-14 11:25:23,351 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-14 11:25:23,351 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-14 11:25:23,352 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-14 11:25:23,353 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-14 11:25:23,353 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-14 11:25:23,354 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-14 11:25:23,354 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-14 11:25:23,355 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-14 11:25:23,355 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-14 11:25:23,355 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-14 11:25:23,356 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-14 11:25:23,356 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-14 11:25:23,357 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-14 11:25:23,386 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-14 11:25:23,387 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-14 11:25:23,387 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-14 11:25:23,387 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-14 11:25:23,388 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-14 11:25:23,388 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-14 11:25:23,388 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-14 11:25:23,389 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-14 11:25:23,389 INFO L138 SettingsManager]: * Use SBE=true [2021-12-14 11:25:23,389 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-14 11:25:23,390 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-14 11:25:23,390 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-14 11:25:23,390 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-14 11:25:23,390 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-14 11:25:23,390 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-14 11:25:23,390 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-14 11:25:23,390 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-14 11:25:23,391 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-14 11:25:23,391 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-14 11:25:23,391 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-14 11:25:23,391 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-14 11:25:23,391 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-14 11:25:23,391 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-14 11:25:23,391 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-14 11:25:23,391 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-14 11:25:23,392 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-14 11:25:23,392 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-14 11:25:23,392 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-14 11:25:23,392 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-14 11:25:23,392 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-14 11:25:23,392 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-14 11:25:23,392 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-14 11:25:23,393 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-14 11:25:23,393 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-14 11:25:23,393 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1be1405ed24182ea691f06aafa4c0ada74bba78ab2a6f90fefc65156bb70df6c [2021-12-14 11:25:23,562 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-14 11:25:23,593 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-14 11:25:23,595 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-14 11:25:23,596 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-14 11:25:23,596 INFO L275 PluginConnector]: CDTParser initialized [2021-12-14 11:25:23,597 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-crafted/zero_sum_const2.c [2021-12-14 11:25:23,639 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f12307940/c636f677ae8e48a993da1107f4f80868/FLAG958c9042d [2021-12-14 11:25:23,987 INFO L306 CDTParser]: Found 1 translation units. [2021-12-14 11:25:23,988 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-crafted/zero_sum_const2.c [2021-12-14 11:25:23,991 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f12307940/c636f677ae8e48a993da1107f4f80868/FLAG958c9042d [2021-12-14 11:25:24,002 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f12307940/c636f677ae8e48a993da1107f4f80868 [2021-12-14 11:25:24,003 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-14 11:25:24,005 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-14 11:25:24,007 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-14 11:25:24,008 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-14 11:25:24,010 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-14 11:25:24,010 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 11:25:24" (1/1) ... [2021-12-14 11:25:24,011 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5479fd0f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:25:24, skipping insertion in model container [2021-12-14 11:25:24,011 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 11:25:24" (1/1) ... [2021-12-14 11:25:24,016 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-14 11:25:24,026 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-14 11:25:24,133 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-crafted/zero_sum_const2.c[406,419] [2021-12-14 11:25:24,143 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-14 11:25:24,148 INFO L203 MainTranslator]: Completed pre-run [2021-12-14 11:25:24,156 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-crafted/zero_sum_const2.c[406,419] [2021-12-14 11:25:24,163 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-14 11:25:24,171 INFO L208 MainTranslator]: Completed translation [2021-12-14 11:25:24,172 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:25:24 WrapperNode [2021-12-14 11:25:24,172 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-14 11:25:24,173 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-14 11:25:24,173 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-14 11:25:24,173 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-14 11:25:24,178 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:25:24" (1/1) ... [2021-12-14 11:25:24,184 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:25:24" (1/1) ... [2021-12-14 11:25:24,201 INFO L137 Inliner]: procedures = 16, calls = 14, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 82 [2021-12-14 11:25:24,202 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-14 11:25:24,203 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-14 11:25:24,203 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-14 11:25:24,203 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-14 11:25:24,208 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:25:24" (1/1) ... [2021-12-14 11:25:24,208 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:25:24" (1/1) ... [2021-12-14 11:25:24,216 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:25:24" (1/1) ... [2021-12-14 11:25:24,216 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:25:24" (1/1) ... [2021-12-14 11:25:24,219 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:25:24" (1/1) ... [2021-12-14 11:25:24,222 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:25:24" (1/1) ... [2021-12-14 11:25:24,223 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:25:24" (1/1) ... [2021-12-14 11:25:24,224 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-14 11:25:24,224 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-14 11:25:24,224 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-14 11:25:24,225 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-14 11:25:24,225 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:25:24" (1/1) ... [2021-12-14 11:25:24,242 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-14 11:25:24,249 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 11:25:24,259 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) [2021-12-14 11:25:24,287 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 [2021-12-14 11:25:24,315 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-14 11:25:24,315 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-14 11:25:24,316 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-14 11:25:24,316 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-14 11:25:24,316 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-14 11:25:24,316 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-14 11:25:24,316 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-14 11:25:24,357 INFO L236 CfgBuilder]: Building ICFG [2021-12-14 11:25:24,358 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-14 11:25:24,522 INFO L277 CfgBuilder]: Performing block encoding [2021-12-14 11:25:24,526 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-14 11:25:24,526 INFO L301 CfgBuilder]: Removed 5 assume(true) statements. [2021-12-14 11:25:24,527 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 11:25:24 BoogieIcfgContainer [2021-12-14 11:25:24,527 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-14 11:25:24,528 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-14 11:25:24,528 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-14 11:25:24,545 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-14 11:25:24,546 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 11:25:24" (1/3) ... [2021-12-14 11:25:24,546 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e470aa7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 11:25:24, skipping insertion in model container [2021-12-14 11:25:24,546 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:25:24" (2/3) ... [2021-12-14 11:25:24,547 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e470aa7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 11:25:24, skipping insertion in model container [2021-12-14 11:25:24,547 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 11:25:24" (3/3) ... [2021-12-14 11:25:24,548 INFO L111 eAbstractionObserver]: Analyzing ICFG zero_sum_const2.c [2021-12-14 11:25:24,551 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-14 11:25:24,552 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-14 11:25:24,603 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-14 11:25:24,611 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 [2021-12-14 11:25:24,611 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-14 11:25:24,624 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 25 states have internal predecessors, (37), 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) [2021-12-14 11:25:24,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-12-14 11:25:24,637 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 11:25:24,638 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 11:25:24,639 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 11:25:24,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 11:25:24,645 INFO L85 PathProgramCache]: Analyzing trace with hash -1122046426, now seen corresponding path program 1 times [2021-12-14 11:25:24,651 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 11:25:24,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1841709497] [2021-12-14 11:25:24,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:25:24,653 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 11:25:24,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:25:24,780 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 11:25:24,781 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 11:25:24,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1841709497] [2021-12-14 11:25:24,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1841709497] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 11:25:24,782 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-14 11:25:24,782 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-14 11:25:24,784 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766650741] [2021-12-14 11:25:24,784 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 11:25:24,787 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-14 11:25:24,787 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 11:25:24,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-14 11:25:24,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-14 11:25:24,810 INFO L87 Difference]: Start difference. First operand has 26 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 25 states have internal predecessors, (37), 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) Second operand has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 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) [2021-12-14 11:25:24,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 11:25:24,824 INFO L93 Difference]: Finished difference Result 47 states and 66 transitions. [2021-12-14 11:25:24,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-14 11:25:24,825 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 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 15 [2021-12-14 11:25:24,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 11:25:24,831 INFO L225 Difference]: With dead ends: 47 [2021-12-14 11:25:24,831 INFO L226 Difference]: Without dead ends: 21 [2021-12-14 11:25:24,833 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-14 11:25:24,837 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 11:25:24,838 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 11:25:24,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-12-14 11:25:24,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-12-14 11:25:24,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.25) internal successors, (25), 20 states have internal predecessors, (25), 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) [2021-12-14 11:25:24,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-12-14 11:25:24,861 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 15 [2021-12-14 11:25:24,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 11:25:24,862 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-12-14 11:25:24,862 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 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) [2021-12-14 11:25:24,862 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-12-14 11:25:24,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-12-14 11:25:24,863 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 11:25:24,863 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 11:25:24,863 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-14 11:25:24,864 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 11:25:24,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 11:25:24,867 INFO L85 PathProgramCache]: Analyzing trace with hash -1896542740, now seen corresponding path program 1 times [2021-12-14 11:25:24,867 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 11:25:24,867 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [742630982] [2021-12-14 11:25:24,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:25:24,868 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 11:25:24,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:25:24,915 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 11:25:24,915 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 11:25:24,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [742630982] [2021-12-14 11:25:24,916 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [742630982] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 11:25:24,916 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-14 11:25:24,916 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-14 11:25:24,916 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729227893] [2021-12-14 11:25:24,917 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 11:25:24,918 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-14 11:25:24,918 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 11:25:24,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-14 11:25:24,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-14 11:25:24,920 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 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) [2021-12-14 11:25:24,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 11:25:24,960 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2021-12-14 11:25:24,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-14 11:25:24,961 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 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 15 [2021-12-14 11:25:24,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 11:25:24,961 INFO L225 Difference]: With dead ends: 39 [2021-12-14 11:25:24,962 INFO L226 Difference]: Without dead ends: 23 [2021-12-14 11:25:24,962 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-14 11:25:24,964 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 11:25:24,965 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 26 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 11:25:24,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-12-14 11:25:24,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-12-14 11:25:24,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 21 states have internal predecessors, (26), 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) [2021-12-14 11:25:24,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2021-12-14 11:25:24,971 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 15 [2021-12-14 11:25:24,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 11:25:24,971 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2021-12-14 11:25:24,972 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 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) [2021-12-14 11:25:24,973 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2021-12-14 11:25:24,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-12-14 11:25:24,974 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 11:25:24,974 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 11:25:24,975 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-14 11:25:24,975 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 11:25:24,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 11:25:24,976 INFO L85 PathProgramCache]: Analyzing trace with hash -66597874, now seen corresponding path program 1 times [2021-12-14 11:25:24,976 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 11:25:24,976 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1422886596] [2021-12-14 11:25:24,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:25:24,977 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 11:25:25,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:25:25,048 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-14 11:25:25,049 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 11:25:25,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1422886596] [2021-12-14 11:25:25,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1422886596] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 11:25:25,049 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-14 11:25:25,050 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-14 11:25:25,050 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779114800] [2021-12-14 11:25:25,050 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 11:25:25,050 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-14 11:25:25,051 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 11:25:25,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-14 11:25:25,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-14 11:25:25,051 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 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) [2021-12-14 11:25:25,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 11:25:25,102 INFO L93 Difference]: Finished difference Result 44 states and 54 transitions. [2021-12-14 11:25:25,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-14 11:25:25,103 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 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 17 [2021-12-14 11:25:25,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 11:25:25,104 INFO L225 Difference]: With dead ends: 44 [2021-12-14 11:25:25,104 INFO L226 Difference]: Without dead ends: 31 [2021-12-14 11:25:25,104 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-14 11:25:25,109 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 21 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 11:25:25,111 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 13 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 11:25:25,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-12-14 11:25:25,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 26. [2021-12-14 11:25:25,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.2) internal successors, (30), 25 states have internal predecessors, (30), 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) [2021-12-14 11:25:25,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2021-12-14 11:25:25,123 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 17 [2021-12-14 11:25:25,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 11:25:25,123 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2021-12-14 11:25:25,123 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 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) [2021-12-14 11:25:25,123 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2021-12-14 11:25:25,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-14 11:25:25,124 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 11:25:25,125 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 11:25:25,125 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-12-14 11:25:25,125 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 11:25:25,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 11:25:25,126 INFO L85 PathProgramCache]: Analyzing trace with hash -2060422634, now seen corresponding path program 1 times [2021-12-14 11:25:25,126 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 11:25:25,126 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1979565511] [2021-12-14 11:25:25,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:25:25,126 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 11:25:25,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:25:25,172 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-14 11:25:25,172 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 11:25:25,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1979565511] [2021-12-14 11:25:25,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1979565511] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 11:25:25,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [594408919] [2021-12-14 11:25:25,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:25:25,173 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:25:25,173 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 11:25:25,184 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) [2021-12-14 11:25:25,185 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-14 11:25:25,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:25:25,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-14 11:25:25,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 11:25:25,346 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-14 11:25:25,347 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 11:25:25,402 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-14 11:25:25,402 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [594408919] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 11:25:25,402 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 11:25:25,402 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-12-14 11:25:25,402 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1545654709] [2021-12-14 11:25:25,403 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 11:25:25,403 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-14 11:25:25,403 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 11:25:25,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-14 11:25:25,404 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2021-12-14 11:25:25,404 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 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) [2021-12-14 11:25:25,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 11:25:25,466 INFO L93 Difference]: Finished difference Result 49 states and 57 transitions. [2021-12-14 11:25:25,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-14 11:25:25,467 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 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 25 [2021-12-14 11:25:25,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 11:25:25,467 INFO L225 Difference]: With dead ends: 49 [2021-12-14 11:25:25,467 INFO L226 Difference]: Without dead ends: 29 [2021-12-14 11:25:25,467 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2021-12-14 11:25:25,468 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 2 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 11:25:25,468 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 28 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-14 11:25:25,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-12-14 11:25:25,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2021-12-14 11:25:25,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 27 states have internal predecessors, (32), 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) [2021-12-14 11:25:25,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2021-12-14 11:25:25,471 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 25 [2021-12-14 11:25:25,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 11:25:25,472 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2021-12-14 11:25:25,472 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 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) [2021-12-14 11:25:25,472 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2021-12-14 11:25:25,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-12-14 11:25:25,472 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 11:25:25,473 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, 1, 1] [2021-12-14 11:25:25,492 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-14 11:25:25,686 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:25:25,686 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 11:25:25,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 11:25:25,687 INFO L85 PathProgramCache]: Analyzing trace with hash -959615560, now seen corresponding path program 2 times [2021-12-14 11:25:25,687 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 11:25:25,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250142495] [2021-12-14 11:25:25,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:25:25,687 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 11:25:25,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:25:25,745 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-12-14 11:25:25,746 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 11:25:25,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250142495] [2021-12-14 11:25:25,746 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [250142495] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 11:25:25,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1790130013] [2021-12-14 11:25:25,746 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-14 11:25:25,746 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:25:25,746 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 11:25:25,747 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) [2021-12-14 11:25:25,748 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-14 11:25:25,782 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-14 11:25:25,782 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 11:25:25,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-14 11:25:25,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 11:25:25,860 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-12-14 11:25:25,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 11:25:25,921 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-12-14 11:25:25,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1790130013] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 11:25:25,922 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 11:25:25,922 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2021-12-14 11:25:25,922 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128261506] [2021-12-14 11:25:25,922 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 11:25:25,923 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-14 11:25:25,923 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 11:25:25,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-14 11:25:25,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=31, Unknown=0, NotChecked=0, Total=56 [2021-12-14 11:25:25,924 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 8 states, 8 states have (on average 5.125) internal successors, (41), 8 states have internal predecessors, (41), 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) [2021-12-14 11:25:25,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 11:25:25,991 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2021-12-14 11:25:25,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-14 11:25:25,992 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.125) internal successors, (41), 8 states have internal predecessors, (41), 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 27 [2021-12-14 11:25:25,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 11:25:25,992 INFO L225 Difference]: With dead ends: 57 [2021-12-14 11:25:25,992 INFO L226 Difference]: Without dead ends: 41 [2021-12-14 11:25:25,993 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=40, Unknown=0, NotChecked=0, Total=72 [2021-12-14 11:25:25,993 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 18 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 11:25:25,993 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 22 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-14 11:25:25,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-12-14 11:25:25,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 36. [2021-12-14 11:25:25,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.1428571428571428) internal successors, (40), 35 states have internal predecessors, (40), 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) [2021-12-14 11:25:25,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2021-12-14 11:25:25,997 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 27 [2021-12-14 11:25:25,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 11:25:25,997 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2021-12-14 11:25:25,997 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.125) internal successors, (41), 8 states have internal predecessors, (41), 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) [2021-12-14 11:25:25,998 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2021-12-14 11:25:25,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-12-14 11:25:26,004 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 11:25:26,005 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 11:25:26,022 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-14 11:25:26,215 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:25:26,215 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 11:25:26,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 11:25:26,216 INFO L85 PathProgramCache]: Analyzing trace with hash -2048824896, now seen corresponding path program 3 times [2021-12-14 11:25:26,216 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 11:25:26,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1677975170] [2021-12-14 11:25:26,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:25:26,216 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 11:25:26,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:25:26,811 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 11:25:26,811 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 11:25:26,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1677975170] [2021-12-14 11:25:26,812 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1677975170] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 11:25:26,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [41366113] [2021-12-14 11:25:26,812 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-14 11:25:26,812 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:25:26,812 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 11:25:26,813 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) [2021-12-14 11:25:26,814 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-14 11:25:26,849 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-14 11:25:26,850 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 11:25:26,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 50 conjunts are in the unsatisfiable core [2021-12-14 11:25:26,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 11:25:26,931 INFO L388 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 15 treesize of output 11 [2021-12-14 11:25:27,709 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-14 11:25:27,710 INFO L388 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 17 treesize of output 18 [2021-12-14 11:25:27,880 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 11:25:27,880 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 11:25:30,736 INFO L388 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 72 treesize of output 64 [2021-12-14 11:25:30,744 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-14 11:25:30,744 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 246 treesize of output 215 [2021-12-14 11:25:31,081 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 11:25:31,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [41366113] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 11:25:31,081 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 11:25:31,081 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 21, 23] total 55 [2021-12-14 11:25:31,081 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083850915] [2021-12-14 11:25:31,081 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 11:25:31,082 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-12-14 11:25:31,082 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 11:25:31,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-12-14 11:25:31,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=2663, Unknown=0, NotChecked=0, Total=2970 [2021-12-14 11:25:31,085 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand has 55 states, 55 states have (on average 1.7636363636363637) internal successors, (97), 55 states have internal predecessors, (97), 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) [2021-12-14 11:25:33,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 11:25:33,198 INFO L93 Difference]: Finished difference Result 98 states and 112 transitions. [2021-12-14 11:25:33,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-12-14 11:25:33,198 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.7636363636363637) internal successors, (97), 55 states have internal predecessors, (97), 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 35 [2021-12-14 11:25:33,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 11:25:33,200 INFO L225 Difference]: With dead ends: 98 [2021-12-14 11:25:33,200 INFO L226 Difference]: Without dead ends: 93 [2021-12-14 11:25:33,202 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 37 SyntacticMatches, 14 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2409 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=827, Invalid=7363, Unknown=0, NotChecked=0, Total=8190 [2021-12-14 11:25:33,203 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 72 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 315 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 936 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 315 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 566 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-14 11:25:33,203 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 86 Invalid, 936 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 315 Invalid, 0 Unknown, 566 Unchecked, 0.2s Time] [2021-12-14 11:25:33,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-12-14 11:25:33,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 63. [2021-12-14 11:25:33,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.1774193548387097) internal successors, (73), 62 states have internal predecessors, (73), 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) [2021-12-14 11:25:33,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 73 transitions. [2021-12-14 11:25:33,209 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 73 transitions. Word has length 35 [2021-12-14 11:25:33,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 11:25:33,210 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 73 transitions. [2021-12-14 11:25:33,210 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 1.7636363636363637) internal successors, (97), 55 states have internal predecessors, (97), 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) [2021-12-14 11:25:33,210 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 73 transitions. [2021-12-14 11:25:33,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-12-14 11:25:33,211 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 11:25:33,211 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 11:25:33,226 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-14 11:25:33,415 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:25:33,415 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 11:25:33,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 11:25:33,416 INFO L85 PathProgramCache]: Analyzing trace with hash -1772469278, now seen corresponding path program 4 times [2021-12-14 11:25:33,416 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 11:25:33,416 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2025437640] [2021-12-14 11:25:33,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:25:33,416 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 11:25:33,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:25:33,488 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-14 11:25:33,488 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 11:25:33,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2025437640] [2021-12-14 11:25:33,488 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2025437640] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 11:25:33,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [479729689] [2021-12-14 11:25:33,488 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-14 11:25:33,489 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:25:33,489 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 11:25:33,490 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) [2021-12-14 11:25:33,491 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-14 11:25:33,523 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-14 11:25:33,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 11:25:33,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-14 11:25:33,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 11:25:33,601 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-14 11:25:33,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 11:25:33,657 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-14 11:25:33,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [479729689] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 11:25:33,659 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 11:25:33,659 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-12-14 11:25:33,659 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411256653] [2021-12-14 11:25:33,659 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 11:25:33,660 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-12-14 11:25:33,660 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 11:25:33,661 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-12-14 11:25:33,661 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2021-12-14 11:25:33,661 INFO L87 Difference]: Start difference. First operand 63 states and 73 transitions. Second operand has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 14 states have internal predecessors, (43), 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) [2021-12-14 11:25:33,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 11:25:33,795 INFO L93 Difference]: Finished difference Result 137 states and 156 transitions. [2021-12-14 11:25:33,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-14 11:25:33,796 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 14 states have internal predecessors, (43), 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 37 [2021-12-14 11:25:33,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 11:25:33,798 INFO L225 Difference]: With dead ends: 137 [2021-12-14 11:25:33,798 INFO L226 Difference]: Without dead ends: 88 [2021-12-14 11:25:33,799 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=192, Unknown=0, NotChecked=0, Total=272 [2021-12-14 11:25:33,800 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 95 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 11:25:33,801 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 40 Invalid, 268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-14 11:25:33,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-12-14 11:25:33,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 72. [2021-12-14 11:25:33,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.1408450704225352) internal successors, (81), 71 states have internal predecessors, (81), 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) [2021-12-14 11:25:33,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 81 transitions. [2021-12-14 11:25:33,813 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 81 transitions. Word has length 37 [2021-12-14 11:25:33,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 11:25:33,814 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 81 transitions. [2021-12-14 11:25:33,814 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 14 states have internal predecessors, (43), 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) [2021-12-14 11:25:33,814 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 81 transitions. [2021-12-14 11:25:33,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-14 11:25:33,818 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 11:25:33,818 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 11:25:33,842 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-14 11:25:34,034 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:25:34,034 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 11:25:34,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 11:25:34,034 INFO L85 PathProgramCache]: Analyzing trace with hash -192826428, now seen corresponding path program 5 times [2021-12-14 11:25:34,034 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 11:25:34,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1933331303] [2021-12-14 11:25:34,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:25:34,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 11:25:34,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:25:34,102 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-12-14 11:25:34,103 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 11:25:34,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1933331303] [2021-12-14 11:25:34,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1933331303] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 11:25:34,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [956361615] [2021-12-14 11:25:34,103 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-14 11:25:34,103 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:25:34,103 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 11:25:34,107 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) [2021-12-14 11:25:34,108 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-14 11:25:34,153 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-12-14 11:25:34,153 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 11:25:34,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-14 11:25:34,155 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 11:25:34,242 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-12-14 11:25:34,242 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 11:25:34,305 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-12-14 11:25:34,305 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [956361615] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 11:25:34,305 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 11:25:34,305 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-12-14 11:25:34,305 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088338495] [2021-12-14 11:25:34,305 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 11:25:34,306 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-12-14 11:25:34,306 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 11:25:34,307 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-12-14 11:25:34,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2021-12-14 11:25:34,307 INFO L87 Difference]: Start difference. First operand 72 states and 81 transitions. Second operand has 14 states, 14 states have (on average 3.857142857142857) internal successors, (54), 14 states have internal predecessors, (54), 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) [2021-12-14 11:25:34,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 11:25:34,429 INFO L93 Difference]: Finished difference Result 82 states and 91 transitions. [2021-12-14 11:25:34,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-14 11:25:34,429 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.857142857142857) internal successors, (54), 14 states have internal predecessors, (54), 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 39 [2021-12-14 11:25:34,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 11:25:34,429 INFO L225 Difference]: With dead ends: 82 [2021-12-14 11:25:34,430 INFO L226 Difference]: Without dead ends: 60 [2021-12-14 11:25:34,430 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=101, Invalid=279, Unknown=0, NotChecked=0, Total=380 [2021-12-14 11:25:34,431 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 80 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 11:25:34,431 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 21 Invalid, 252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-14 11:25:34,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-12-14 11:25:34,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 46. [2021-12-14 11:25:34,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.1111111111111112) internal successors, (50), 45 states have internal predecessors, (50), 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) [2021-12-14 11:25:34,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2021-12-14 11:25:34,434 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 39 [2021-12-14 11:25:34,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 11:25:34,435 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2021-12-14 11:25:34,435 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.857142857142857) internal successors, (54), 14 states have internal predecessors, (54), 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) [2021-12-14 11:25:34,435 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2021-12-14 11:25:34,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-14 11:25:34,435 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 11:25:34,435 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 11:25:34,451 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-12-14 11:25:34,643 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:25:34,643 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 11:25:34,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 11:25:34,644 INFO L85 PathProgramCache]: Analyzing trace with hash -604138262, now seen corresponding path program 6 times [2021-12-14 11:25:34,644 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 11:25:34,644 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1630918887] [2021-12-14 11:25:34,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:25:34,644 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 11:25:34,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:25:36,203 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 11:25:36,203 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 11:25:36,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1630918887] [2021-12-14 11:25:36,204 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1630918887] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 11:25:36,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1342887668] [2021-12-14 11:25:36,204 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-14 11:25:36,204 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:25:36,204 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 11:25:36,205 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) [2021-12-14 11:25:36,205 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-14 11:25:36,244 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-12-14 11:25:36,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 11:25:36,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 61 conjunts are in the unsatisfiable core [2021-12-14 11:25:36,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 11:25:36,973 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-14 11:25:36,973 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 11:25:37,694 INFO L354 Elim1Store]: treesize reduction 114, result has 46.0 percent of original size [2021-12-14 11:25:37,695 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 53 treesize of output 108 [2021-12-14 11:25:37,893 INFO L354 Elim1Store]: treesize reduction 198, result has 6.2 percent of original size [2021-12-14 11:25:37,893 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 52 treesize of output 23 [2021-12-14 11:25:37,957 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-14 11:25:37,957 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1342887668] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 11:25:37,957 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 11:25:37,958 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 17, 16] total 62 [2021-12-14 11:25:37,958 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188497052] [2021-12-14 11:25:37,958 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 11:25:37,958 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-12-14 11:25:37,958 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 11:25:37,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-12-14 11:25:37,959 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=3537, Unknown=0, NotChecked=0, Total=3782 [2021-12-14 11:25:37,960 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 62 states, 62 states have (on average 1.8709677419354838) internal successors, (116), 62 states have internal predecessors, (116), 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) [2021-12-14 11:25:40,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 11:25:40,932 INFO L93 Difference]: Finished difference Result 80 states and 87 transitions. [2021-12-14 11:25:40,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-12-14 11:25:40,932 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.8709677419354838) internal successors, (116), 62 states have internal predecessors, (116), 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 45 [2021-12-14 11:25:40,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 11:25:40,933 INFO L225 Difference]: With dead ends: 80 [2021-12-14 11:25:40,933 INFO L226 Difference]: Without dead ends: 76 [2021-12-14 11:25:40,935 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 59 SyntacticMatches, 7 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2355 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=725, Invalid=9375, Unknown=0, NotChecked=0, Total=10100 [2021-12-14 11:25:40,946 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 27 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 1354 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 1483 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 1354 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-14 11:25:40,946 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 96 Invalid, 1483 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 1354 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-12-14 11:25:40,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-12-14 11:25:40,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 67. [2021-12-14 11:25:40,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.121212121212121) internal successors, (74), 66 states have internal predecessors, (74), 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) [2021-12-14 11:25:40,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 74 transitions. [2021-12-14 11:25:40,958 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 74 transitions. Word has length 45 [2021-12-14 11:25:40,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 11:25:40,959 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 74 transitions. [2021-12-14 11:25:40,959 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 1.8709677419354838) internal successors, (116), 62 states have internal predecessors, (116), 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) [2021-12-14 11:25:40,959 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 74 transitions. [2021-12-14 11:25:40,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-14 11:25:40,961 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 11:25:40,961 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 11:25:40,979 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-14 11:25:41,165 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:25:41,165 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 11:25:41,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 11:25:41,166 INFO L85 PathProgramCache]: Analyzing trace with hash -703050612, now seen corresponding path program 7 times [2021-12-14 11:25:41,166 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 11:25:41,166 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1799555047] [2021-12-14 11:25:41,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:25:41,166 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 11:25:41,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:25:41,240 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-12-14 11:25:41,240 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 11:25:41,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1799555047] [2021-12-14 11:25:41,241 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1799555047] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 11:25:41,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [230914222] [2021-12-14 11:25:41,241 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-14 11:25:41,241 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:25:41,241 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 11:25:41,242 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) [2021-12-14 11:25:41,243 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-14 11:25:41,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:25:41,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-14 11:25:41,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 11:25:41,415 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-12-14 11:25:41,416 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 11:25:41,484 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-12-14 11:25:41,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [230914222] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 11:25:41,484 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 11:25:41,484 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2021-12-14 11:25:41,484 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379851439] [2021-12-14 11:25:41,484 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 11:25:41,484 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-14 11:25:41,484 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 11:25:41,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-14 11:25:41,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=197, Unknown=0, NotChecked=0, Total=272 [2021-12-14 11:25:41,485 INFO L87 Difference]: Start difference. First operand 67 states and 74 transitions. Second operand has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 17 states have internal predecessors, (49), 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) [2021-12-14 11:25:41,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 11:25:41,643 INFO L93 Difference]: Finished difference Result 149 states and 164 transitions. [2021-12-14 11:25:41,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-14 11:25:41,643 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 17 states have internal predecessors, (49), 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 47 [2021-12-14 11:25:41,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 11:25:41,644 INFO L225 Difference]: With dead ends: 149 [2021-12-14 11:25:41,644 INFO L226 Difference]: Without dead ends: 86 [2021-12-14 11:25:41,645 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=117, Invalid=303, Unknown=0, NotChecked=0, Total=420 [2021-12-14 11:25:41,645 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 151 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 198 mSolverCounterSat, 154 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 151 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 352 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 154 IncrementalHoareTripleChecker+Valid, 198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 11:25:41,645 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [151 Valid, 39 Invalid, 352 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [154 Valid, 198 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-14 11:25:41,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-12-14 11:25:41,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 70. [2021-12-14 11:25:41,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.1014492753623188) internal successors, (76), 69 states have internal predecessors, (76), 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) [2021-12-14 11:25:41,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 76 transitions. [2021-12-14 11:25:41,650 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 76 transitions. Word has length 47 [2021-12-14 11:25:41,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 11:25:41,650 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 76 transitions. [2021-12-14 11:25:41,650 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 17 states have internal predecessors, (49), 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) [2021-12-14 11:25:41,650 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 76 transitions. [2021-12-14 11:25:41,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-12-14 11:25:41,650 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 11:25:41,651 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 11:25:41,668 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-14 11:25:41,855 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:25:41,856 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 11:25:41,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 11:25:41,856 INFO L85 PathProgramCache]: Analyzing trace with hash 1992374766, now seen corresponding path program 8 times [2021-12-14 11:25:41,856 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 11:25:41,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1058500418] [2021-12-14 11:25:41,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:25:41,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 11:25:41,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:25:41,926 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-12-14 11:25:41,926 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 11:25:41,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1058500418] [2021-12-14 11:25:41,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1058500418] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 11:25:41,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1260411499] [2021-12-14 11:25:41,927 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-14 11:25:41,927 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:25:41,927 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 11:25:41,928 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) [2021-12-14 11:25:41,929 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-14 11:25:41,968 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-14 11:25:41,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 11:25:41,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-14 11:25:41,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 11:25:42,076 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-12-14 11:25:42,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 11:25:42,158 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-12-14 11:25:42,158 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1260411499] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 11:25:42,158 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 11:25:42,158 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2021-12-14 11:25:42,159 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073337407] [2021-12-14 11:25:42,159 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 11:25:42,159 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-14 11:25:42,159 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 11:25:42,159 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-14 11:25:42,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=197, Unknown=0, NotChecked=0, Total=272 [2021-12-14 11:25:42,160 INFO L87 Difference]: Start difference. First operand 70 states and 76 transitions. Second operand has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 17 states have internal predecessors, (49), 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) [2021-12-14 11:25:42,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 11:25:42,331 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2021-12-14 11:25:42,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-14 11:25:42,331 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 17 states have internal predecessors, (49), 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 49 [2021-12-14 11:25:42,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 11:25:42,332 INFO L225 Difference]: With dead ends: 80 [2021-12-14 11:25:42,332 INFO L226 Difference]: Without dead ends: 60 [2021-12-14 11:25:42,332 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=149, Invalid=451, Unknown=0, NotChecked=0, Total=600 [2021-12-14 11:25:42,333 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 84 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 269 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 354 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 269 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 11:25:42,333 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 27 Invalid, 354 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 269 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-14 11:25:42,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-12-14 11:25:42,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 56. [2021-12-14 11:25:42,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.0909090909090908) internal successors, (60), 55 states have internal predecessors, (60), 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) [2021-12-14 11:25:42,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2021-12-14 11:25:42,336 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 49 [2021-12-14 11:25:42,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 11:25:42,337 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2021-12-14 11:25:42,337 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 17 states have internal predecessors, (49), 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) [2021-12-14 11:25:42,337 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2021-12-14 11:25:42,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-12-14 11:25:42,337 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 11:25:42,337 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 11:25:42,353 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-12-14 11:25:42,543 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,SelfDestructingSolverStorable10 [2021-12-14 11:25:42,543 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 11:25:42,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 11:25:42,544 INFO L85 PathProgramCache]: Analyzing trace with hash -2047700076, now seen corresponding path program 9 times [2021-12-14 11:25:42,544 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 11:25:42,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1155352641] [2021-12-14 11:25:42,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:25:42,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 11:25:42,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:25:44,662 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 11:25:44,662 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 11:25:44,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1155352641] [2021-12-14 11:25:44,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1155352641] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 11:25:44,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [188373858] [2021-12-14 11:25:44,662 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-14 11:25:44,662 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:25:44,662 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 11:25:44,663 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) [2021-12-14 11:25:44,664 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-14 11:25:44,711 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-12-14 11:25:44,711 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 11:25:44,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 86 conjunts are in the unsatisfiable core [2021-12-14 11:25:44,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 11:25:44,776 INFO L388 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 15 treesize of output 11 [2021-12-14 11:25:46,316 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-14 11:25:46,318 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-14 11:25:46,319 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-14 11:25:46,329 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-14 11:25:46,330 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 36 treesize of output 51 [2021-12-14 11:25:46,548 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 5 proven. 71 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-14 11:25:46,548 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 11:25:50,385 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-14 11:25:50,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [188373858] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 11:25:50,385 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 11:25:50,385 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 26, 21] total 86 [2021-12-14 11:25:50,386 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449662886] [2021-12-14 11:25:50,386 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 11:25:50,386 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2021-12-14 11:25:50,386 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 11:25:50,387 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-12-14 11:25:50,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=546, Invalid=6764, Unknown=0, NotChecked=0, Total=7310 [2021-12-14 11:25:50,388 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand has 86 states, 86 states have (on average 1.7325581395348837) internal successors, (149), 86 states have internal predecessors, (149), 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) [2021-12-14 11:25:54,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 11:25:54,468 INFO L93 Difference]: Finished difference Result 94 states and 101 transitions. [2021-12-14 11:25:54,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-12-14 11:25:54,468 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 1.7325581395348837) internal successors, (149), 86 states have internal predecessors, (149), 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 55 [2021-12-14 11:25:54,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 11:25:54,469 INFO L225 Difference]: With dead ends: 94 [2021-12-14 11:25:54,469 INFO L226 Difference]: Without dead ends: 90 [2021-12-14 11:25:54,472 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 61 SyntacticMatches, 11 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5124 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=1292, Invalid=16798, Unknown=0, NotChecked=0, Total=18090 [2021-12-14 11:25:54,472 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 24 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 1002 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 1740 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 1002 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 631 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-14 11:25:54,473 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 137 Invalid, 1740 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 1002 Invalid, 0 Unknown, 631 Unchecked, 0.5s Time] [2021-12-14 11:25:54,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-12-14 11:25:54,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 81. [2021-12-14 11:25:54,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 80 states have (on average 1.1) internal successors, (88), 80 states have internal predecessors, (88), 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) [2021-12-14 11:25:54,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 88 transitions. [2021-12-14 11:25:54,478 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 88 transitions. Word has length 55 [2021-12-14 11:25:54,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 11:25:54,478 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 88 transitions. [2021-12-14 11:25:54,479 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 86 states have (on average 1.7325581395348837) internal successors, (149), 86 states have internal predecessors, (149), 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) [2021-12-14 11:25:54,479 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 88 transitions. [2021-12-14 11:25:54,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-12-14 11:25:54,479 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 11:25:54,479 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 11:25:54,496 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-12-14 11:25:54,696 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:25:54,696 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 11:25:54,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 11:25:54,696 INFO L85 PathProgramCache]: Analyzing trace with hash -691517258, now seen corresponding path program 10 times [2021-12-14 11:25:54,696 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 11:25:54,696 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1037179613] [2021-12-14 11:25:54,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:25:54,697 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 11:25:54,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:25:54,770 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 18 proven. 23 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-12-14 11:25:54,770 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 11:25:54,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1037179613] [2021-12-14 11:25:54,770 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1037179613] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 11:25:54,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [421628728] [2021-12-14 11:25:54,770 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-14 11:25:54,770 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:25:54,771 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 11:25:54,784 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) [2021-12-14 11:25:54,797 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-14 11:25:54,838 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-14 11:25:54,838 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 11:25:54,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-14 11:25:54,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 11:25:54,987 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 25 proven. 16 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-12-14 11:25:54,987 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 11:25:55,075 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 25 proven. 16 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-12-14 11:25:55,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [421628728] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 11:25:55,075 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 11:25:55,076 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-12-14 11:25:55,076 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553415596] [2021-12-14 11:25:55,076 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 11:25:55,076 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-14 11:25:55,076 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 11:25:55,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-14 11:25:55,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=279, Unknown=0, NotChecked=0, Total=380 [2021-12-14 11:25:55,077 INFO L87 Difference]: Start difference. First operand 81 states and 88 transitions. Second operand has 20 states, 20 states have (on average 2.75) internal successors, (55), 20 states have internal predecessors, (55), 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) [2021-12-14 11:25:55,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 11:25:55,264 INFO L93 Difference]: Finished difference Result 177 states and 192 transitions. [2021-12-14 11:25:55,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-14 11:25:55,264 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.75) internal successors, (55), 20 states have internal predecessors, (55), 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 57 [2021-12-14 11:25:55,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 11:25:55,265 INFO L225 Difference]: With dead ends: 177 [2021-12-14 11:25:55,265 INFO L226 Difference]: Without dead ends: 100 [2021-12-14 11:25:55,265 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=161, Invalid=439, Unknown=0, NotChecked=0, Total=600 [2021-12-14 11:25:55,266 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 181 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 256 mSolverCounterSat, 185 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 181 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 441 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 185 IncrementalHoareTripleChecker+Valid, 256 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 11:25:55,266 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [181 Valid, 36 Invalid, 441 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [185 Valid, 256 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-14 11:25:55,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-12-14 11:25:55,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 84. [2021-12-14 11:25:55,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 83 states have (on average 1.0843373493975903) internal successors, (90), 83 states have internal predecessors, (90), 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) [2021-12-14 11:25:55,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 90 transitions. [2021-12-14 11:25:55,271 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 90 transitions. Word has length 57 [2021-12-14 11:25:55,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 11:25:55,271 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 90 transitions. [2021-12-14 11:25:55,272 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.75) internal successors, (55), 20 states have internal predecessors, (55), 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) [2021-12-14 11:25:55,272 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 90 transitions. [2021-12-14 11:25:55,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-12-14 11:25:55,272 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 11:25:55,272 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 11:25:55,288 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-12-14 11:25:55,472 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,SelfDestructingSolverStorable12 [2021-12-14 11:25:55,473 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 11:25:55,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 11:25:55,473 INFO L85 PathProgramCache]: Analyzing trace with hash -1701588072, now seen corresponding path program 11 times [2021-12-14 11:25:55,473 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 11:25:55,473 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [137367872] [2021-12-14 11:25:55,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:25:55,473 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 11:25:55,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:25:55,553 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 9 proven. 32 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-12-14 11:25:55,553 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 11:25:55,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [137367872] [2021-12-14 11:25:55,554 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [137367872] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 11:25:55,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1552346953] [2021-12-14 11:25:55,554 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-14 11:25:55,554 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:25:55,554 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 11:25:55,555 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) [2021-12-14 11:25:55,555 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-14 11:25:55,646 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-12-14 11:25:55,646 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 11:25:55,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-14 11:25:55,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 11:25:55,772 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 16 proven. 25 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-12-14 11:25:55,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 11:25:55,850 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 16 proven. 25 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-12-14 11:25:55,851 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1552346953] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 11:25:55,851 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 11:25:55,851 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-12-14 11:25:55,851 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125257151] [2021-12-14 11:25:55,851 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 11:25:55,851 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-14 11:25:55,851 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 11:25:55,852 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-14 11:25:55,852 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=279, Unknown=0, NotChecked=0, Total=380 [2021-12-14 11:25:55,852 INFO L87 Difference]: Start difference. First operand 84 states and 90 transitions. Second operand has 20 states, 20 states have (on average 3.3) internal successors, (66), 20 states have internal predecessors, (66), 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) [2021-12-14 11:25:56,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 11:25:56,058 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2021-12-14 11:25:56,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-14 11:25:56,059 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.3) internal successors, (66), 20 states have internal predecessors, (66), 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 59 [2021-12-14 11:25:56,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 11:25:56,059 INFO L225 Difference]: With dead ends: 94 [2021-12-14 11:25:56,059 INFO L226 Difference]: Without dead ends: 70 [2021-12-14 11:25:56,059 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 111 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=207, Invalid=663, Unknown=0, NotChecked=0, Total=870 [2021-12-14 11:25:56,060 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 112 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 323 mSolverCounterSat, 112 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 435 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 112 IncrementalHoareTripleChecker+Valid, 323 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 11:25:56,060 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [112 Valid, 28 Invalid, 435 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [112 Valid, 323 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-14 11:25:56,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-12-14 11:25:56,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 66. [2021-12-14 11:25:56,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 65 states have (on average 1.0769230769230769) internal successors, (70), 65 states have internal predecessors, (70), 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) [2021-12-14 11:25:56,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 70 transitions. [2021-12-14 11:25:56,064 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 70 transitions. Word has length 59 [2021-12-14 11:25:56,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 11:25:56,064 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 70 transitions. [2021-12-14 11:25:56,064 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.3) internal successors, (66), 20 states have internal predecessors, (66), 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) [2021-12-14 11:25:56,064 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 70 transitions. [2021-12-14 11:25:56,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-12-14 11:25:56,065 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 11:25:56,065 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 11:25:56,081 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-12-14 11:25:56,275 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,SelfDestructingSolverStorable13 [2021-12-14 11:25:56,275 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 11:25:56,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 11:25:56,276 INFO L85 PathProgramCache]: Analyzing trace with hash -1079638594, now seen corresponding path program 12 times [2021-12-14 11:25:56,276 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 11:25:56,276 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [866485435] [2021-12-14 11:25:56,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:25:56,276 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 11:25:56,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:25:59,109 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 4 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 11:25:59,110 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 11:25:59,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [866485435] [2021-12-14 11:25:59,110 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [866485435] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 11:25:59,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [282890199] [2021-12-14 11:25:59,110 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-14 11:25:59,110 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:25:59,110 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 11:25:59,111 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) [2021-12-14 11:25:59,112 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-14 11:25:59,166 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-12-14 11:25:59,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 11:25:59,169 WARN L261 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 104 conjunts are in the unsatisfiable core [2021-12-14 11:25:59,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 11:25:59,299 INFO L388 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 15 treesize of output 11 [2021-12-14 11:26:01,380 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-14 11:26:01,381 INFO L388 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 17 treesize of output 18 [2021-12-14 11:26:01,614 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 3 proven. 121 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-14 11:26:01,614 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 11:26:07,359 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 109 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-14 11:26:07,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [282890199] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 11:26:07,360 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 11:26:07,360 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 32, 25] total 105 [2021-12-14 11:26:07,360 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889516193] [2021-12-14 11:26:07,360 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 11:26:07,360 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 105 states [2021-12-14 11:26:07,360 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 11:26:07,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2021-12-14 11:26:07,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=602, Invalid=10318, Unknown=0, NotChecked=0, Total=10920 [2021-12-14 11:26:07,363 INFO L87 Difference]: Start difference. First operand 66 states and 70 transitions. Second operand has 105 states, 105 states have (on average 1.6952380952380952) internal successors, (178), 105 states have internal predecessors, (178), 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) [2021-12-14 11:26:12,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 11:26:12,861 INFO L93 Difference]: Finished difference Result 109 states and 116 transitions. [2021-12-14 11:26:12,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-12-14 11:26:12,861 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 105 states have (on average 1.6952380952380952) internal successors, (178), 105 states have internal predecessors, (178), 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 65 [2021-12-14 11:26:12,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 11:26:12,861 INFO L225 Difference]: With dead ends: 109 [2021-12-14 11:26:12,862 INFO L226 Difference]: Without dead ends: 105 [2021-12-14 11:26:12,863 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 73 SyntacticMatches, 13 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7431 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=1413, Invalid=23393, Unknown=0, NotChecked=0, Total=24806 [2021-12-14 11:26:12,864 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 36 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 1430 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 2340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 1430 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 795 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-14 11:26:12,864 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 157 Invalid, 2340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 1430 Invalid, 0 Unknown, 795 Unchecked, 0.7s Time] [2021-12-14 11:26:12,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-12-14 11:26:12,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 95. [2021-12-14 11:26:12,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.0851063829787233) internal successors, (102), 94 states have internal predecessors, (102), 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) [2021-12-14 11:26:12,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 102 transitions. [2021-12-14 11:26:12,870 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 102 transitions. Word has length 65 [2021-12-14 11:26:12,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 11:26:12,870 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 102 transitions. [2021-12-14 11:26:12,870 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 105 states, 105 states have (on average 1.6952380952380952) internal successors, (178), 105 states have internal predecessors, (178), 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) [2021-12-14 11:26:12,870 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 102 transitions. [2021-12-14 11:26:12,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-12-14 11:26:12,871 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 11:26:12,871 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 11:26:12,887 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-12-14 11:26:13,087 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,SelfDestructingSolverStorable14 [2021-12-14 11:26:13,087 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 11:26:13,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 11:26:13,087 INFO L85 PathProgramCache]: Analyzing trace with hash 1902631008, now seen corresponding path program 13 times [2021-12-14 11:26:13,088 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 11:26:13,088 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1317684343] [2021-12-14 11:26:13,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:26:13,088 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 11:26:13,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:26:13,198 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 27 proven. 34 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-12-14 11:26:13,198 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 11:26:13,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1317684343] [2021-12-14 11:26:13,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1317684343] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 11:26:13,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1546596883] [2021-12-14 11:26:13,198 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-14 11:26:13,199 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:26:13,199 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 11:26:13,209 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) [2021-12-14 11:26:13,210 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-12-14 11:26:13,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:26:13,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-14 11:26:13,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 11:26:13,430 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 36 proven. 25 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-12-14 11:26:13,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 11:26:13,521 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 36 proven. 25 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-12-14 11:26:13,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1546596883] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 11:26:13,521 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 11:26:13,521 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-12-14 11:26:13,521 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675115125] [2021-12-14 11:26:13,521 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 11:26:13,521 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-14 11:26:13,521 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 11:26:13,522 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-14 11:26:13,522 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=375, Unknown=0, NotChecked=0, Total=506 [2021-12-14 11:26:13,522 INFO L87 Difference]: Start difference. First operand 95 states and 102 transitions. Second operand has 23 states, 23 states have (on average 2.652173913043478) internal successors, (61), 23 states have internal predecessors, (61), 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) [2021-12-14 11:26:13,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 11:26:13,737 INFO L93 Difference]: Finished difference Result 205 states and 220 transitions. [2021-12-14 11:26:13,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-14 11:26:13,737 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.652173913043478) internal successors, (61), 23 states have internal predecessors, (61), 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 67 [2021-12-14 11:26:13,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 11:26:13,738 INFO L225 Difference]: With dead ends: 205 [2021-12-14 11:26:13,738 INFO L226 Difference]: Without dead ends: 114 [2021-12-14 11:26:13,738 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2021-12-14 11:26:13,738 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 196 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 294 mSolverCounterSat, 202 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 196 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 496 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 202 IncrementalHoareTripleChecker+Valid, 294 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-14 11:26:13,739 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [196 Valid, 40 Invalid, 496 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [202 Valid, 294 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-14 11:26:13,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-12-14 11:26:13,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 98. [2021-12-14 11:26:13,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 97 states have (on average 1.0721649484536082) internal successors, (104), 97 states have internal predecessors, (104), 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) [2021-12-14 11:26:13,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 104 transitions. [2021-12-14 11:26:13,745 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 104 transitions. Word has length 67 [2021-12-14 11:26:13,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 11:26:13,745 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 104 transitions. [2021-12-14 11:26:13,745 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.652173913043478) internal successors, (61), 23 states have internal predecessors, (61), 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) [2021-12-14 11:26:13,745 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 104 transitions. [2021-12-14 11:26:13,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-12-14 11:26:13,745 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 11:26:13,745 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 11:26:13,770 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-12-14 11:26:13,959 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,SelfDestructingSolverStorable15 [2021-12-14 11:26:13,959 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 11:26:13,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 11:26:13,960 INFO L85 PathProgramCache]: Analyzing trace with hash 2014257346, now seen corresponding path program 14 times [2021-12-14 11:26:13,960 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 11:26:13,960 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [969946130] [2021-12-14 11:26:13,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:26:13,960 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 11:26:13,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:26:14,055 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 16 proven. 45 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-12-14 11:26:14,056 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 11:26:14,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [969946130] [2021-12-14 11:26:14,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [969946130] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 11:26:14,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1653000746] [2021-12-14 11:26:14,056 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-14 11:26:14,056 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:26:14,057 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 11:26:14,057 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) [2021-12-14 11:26:14,058 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-12-14 11:26:14,112 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-14 11:26:14,113 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 11:26:14,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-14 11:26:14,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 11:26:14,287 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 25 proven. 36 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-12-14 11:26:14,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 11:26:14,388 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 25 proven. 36 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-12-14 11:26:14,388 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1653000746] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 11:26:14,388 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 11:26:14,388 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-12-14 11:26:14,388 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625818313] [2021-12-14 11:26:14,388 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 11:26:14,389 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-14 11:26:14,389 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 11:26:14,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-14 11:26:14,389 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=375, Unknown=0, NotChecked=0, Total=506 [2021-12-14 11:26:14,390 INFO L87 Difference]: Start difference. First operand 98 states and 104 transitions. Second operand has 23 states, 23 states have (on average 2.652173913043478) internal successors, (61), 23 states have internal predecessors, (61), 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) [2021-12-14 11:26:14,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 11:26:14,646 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2021-12-14 11:26:14,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-14 11:26:14,646 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.652173913043478) internal successors, (61), 23 states have internal predecessors, (61), 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 69 [2021-12-14 11:26:14,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 11:26:14,646 INFO L225 Difference]: With dead ends: 108 [2021-12-14 11:26:14,647 INFO L226 Difference]: Without dead ends: 80 [2021-12-14 11:26:14,647 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 128 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=275, Invalid=915, Unknown=0, NotChecked=0, Total=1190 [2021-12-14 11:26:14,647 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 232 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 318 mSolverCounterSat, 213 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 232 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 531 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 213 IncrementalHoareTripleChecker+Valid, 318 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-14 11:26:14,647 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [232 Valid, 20 Invalid, 531 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [213 Valid, 318 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-14 11:26:14,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-12-14 11:26:14,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 76. [2021-12-14 11:26:14,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 75 states have (on average 1.0666666666666667) internal successors, (80), 75 states have internal predecessors, (80), 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) [2021-12-14 11:26:14,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 80 transitions. [2021-12-14 11:26:14,652 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 80 transitions. Word has length 69 [2021-12-14 11:26:14,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 11:26:14,653 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 80 transitions. [2021-12-14 11:26:14,653 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.652173913043478) internal successors, (61), 23 states have internal predecessors, (61), 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) [2021-12-14 11:26:14,653 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 80 transitions. [2021-12-14 11:26:14,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-12-14 11:26:14,653 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 11:26:14,653 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 11:26:14,673 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-12-14 11:26:14,869 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:26:14,870 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 11:26:14,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 11:26:14,870 INFO L85 PathProgramCache]: Analyzing trace with hash 209029992, now seen corresponding path program 15 times [2021-12-14 11:26:14,870 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 11:26:14,870 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [956471345] [2021-12-14 11:26:14,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 11:26:14,870 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 11:26:14,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 11:26:18,919 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 4 proven. 176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 11:26:18,920 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 11:26:18,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [956471345] [2021-12-14 11:26:18,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [956471345] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 11:26:18,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [839423876] [2021-12-14 11:26:18,920 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-14 11:26:18,920 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 11:26:18,920 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 11:26:18,921 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) [2021-12-14 11:26:18,921 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-12-14 11:26:18,992 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-12-14 11:26:18,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 11:26:19,008 WARN L261 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 122 conjunts are in the unsatisfiable core [2021-12-14 11:26:19,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 11:26:19,107 INFO L388 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 15 treesize of output 11 [2021-12-14 11:26:22,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-14 11:26:22,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-14 11:26:22,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-14 11:26:22,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-14 11:26:22,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-14 11:26:22,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-14 11:26:22,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-14 11:26:22,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-14 11:26:22,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-14 11:26:22,232 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-14 11:26:22,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 54 treesize of output 99 [2021-12-14 11:26:22,603 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 7 proven. 164 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-14 11:26:22,604 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 11:26:30,294 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-12-14 11:26:30,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [839423876] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 11:26:30,295 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 11:26:30,295 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 35, 29] total 122 [2021-12-14 11:26:30,295 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915540816] [2021-12-14 11:26:30,295 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 11:26:30,295 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 122 states [2021-12-14 11:26:30,295 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 11:26:30,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2021-12-14 11:26:30,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=726, Invalid=14036, Unknown=0, NotChecked=0, Total=14762 [2021-12-14 11:26:30,296 INFO L87 Difference]: Start difference. First operand 76 states and 80 transitions. Second operand has 122 states, 122 states have (on average 1.6557377049180328) internal successors, (202), 122 states have internal predecessors, (202), 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)