./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/nla-digbench-scaling/ps6-ll_unwindbound10.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version ff03de63 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/nla-digbench-scaling/ps6-ll_unwindbound10.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 ebfcdae9f2d92c4e39230ecf30ad4ac0897188e9aff6dcbde95509d87ea826ad --- Real Ultimate output --- This is Ultimate 0.2.2-dev-ff03de6 [2021-12-21 12:51:41,402 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-21 12:51:41,403 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-21 12:51:41,434 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-21 12:51:41,434 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-21 12:51:41,435 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-21 12:51:41,436 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-21 12:51:41,437 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-21 12:51:41,438 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-21 12:51:41,439 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-21 12:51:41,439 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-21 12:51:41,440 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-21 12:51:41,440 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-21 12:51:41,447 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-21 12:51:41,449 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-21 12:51:41,450 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-21 12:51:41,451 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-21 12:51:41,452 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-21 12:51:41,456 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-21 12:51:41,457 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-21 12:51:41,459 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-21 12:51:41,460 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-21 12:51:41,461 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-21 12:51:41,462 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-21 12:51:41,464 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-21 12:51:41,469 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-21 12:51:41,470 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-21 12:51:41,470 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-21 12:51:41,471 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-21 12:51:41,471 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-21 12:51:41,472 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-21 12:51:41,472 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-21 12:51:41,473 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-21 12:51:41,474 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-21 12:51:41,475 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-21 12:51:41,475 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-21 12:51:41,476 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-21 12:51:41,476 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-21 12:51:41,477 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-21 12:51:41,477 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-21 12:51:41,478 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-21 12:51:41,478 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-21 12:51:41,505 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-21 12:51:41,507 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-21 12:51:41,508 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-21 12:51:41,508 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-21 12:51:41,508 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-21 12:51:41,508 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-21 12:51:41,509 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-21 12:51:41,509 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-21 12:51:41,509 INFO L138 SettingsManager]: * Use SBE=true [2021-12-21 12:51:41,510 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-21 12:51:41,510 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-21 12:51:41,510 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-21 12:51:41,511 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-21 12:51:41,511 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-21 12:51:41,511 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-21 12:51:41,511 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-21 12:51:41,511 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-21 12:51:41,511 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-21 12:51:41,511 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-21 12:51:41,511 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-21 12:51:41,512 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-21 12:51:41,512 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-21 12:51:41,512 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-21 12:51:41,512 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-21 12:51:41,512 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 12:51:41,512 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-21 12:51:41,512 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-21 12:51:41,513 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-21 12:51:41,514 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-21 12:51:41,514 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-21 12:51:41,514 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-21 12:51:41,514 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-21 12:51:41,514 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-21 12:51:41,514 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-21 12:51:41,515 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ebfcdae9f2d92c4e39230ecf30ad4ac0897188e9aff6dcbde95509d87ea826ad [2021-12-21 12:51:41,734 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-21 12:51:41,753 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-21 12:51:41,755 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-21 12:51:41,756 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-21 12:51:41,771 INFO L275 PluginConnector]: CDTParser initialized [2021-12-21 12:51:41,772 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/nla-digbench-scaling/ps6-ll_unwindbound10.c [2021-12-21 12:51:41,827 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/16a47935d/5ae02396228f4e45934f51f635cfe9ea/FLAGe8ea69ddf [2021-12-21 12:51:42,156 INFO L306 CDTParser]: Found 1 translation units. [2021-12-21 12:51:42,157 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/ps6-ll_unwindbound10.c [2021-12-21 12:51:42,161 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/16a47935d/5ae02396228f4e45934f51f635cfe9ea/FLAGe8ea69ddf [2021-12-21 12:51:42,170 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/16a47935d/5ae02396228f4e45934f51f635cfe9ea [2021-12-21 12:51:42,172 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-21 12:51:42,173 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-21 12:51:42,174 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-21 12:51:42,174 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-21 12:51:42,177 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-21 12:51:42,177 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 12:51:42" (1/1) ... [2021-12-21 12:51:42,178 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c7db5c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:51:42, skipping insertion in model container [2021-12-21 12:51:42,178 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 12:51:42" (1/1) ... [2021-12-21 12:51:42,183 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-21 12:51:42,192 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-21 12:51:42,297 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/ps6-ll_unwindbound10.c[458,471] [2021-12-21 12:51:42,325 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 12:51:42,332 INFO L203 MainTranslator]: Completed pre-run [2021-12-21 12:51:42,342 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/ps6-ll_unwindbound10.c[458,471] [2021-12-21 12:51:42,361 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 12:51:42,376 INFO L208 MainTranslator]: Completed translation [2021-12-21 12:51:42,378 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:51:42 WrapperNode [2021-12-21 12:51:42,378 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-21 12:51:42,380 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-21 12:51:42,380 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-21 12:51:42,380 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-21 12:51:42,385 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:51:42" (1/1) ... [2021-12-21 12:51:42,390 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:51:42" (1/1) ... [2021-12-21 12:51:42,407 INFO L137 Inliner]: procedures = 14, calls = 11, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 43 [2021-12-21 12:51:42,408 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-21 12:51:42,408 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-21 12:51:42,408 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-21 12:51:42,408 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-21 12:51:42,414 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:51:42" (1/1) ... [2021-12-21 12:51:42,414 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:51:42" (1/1) ... [2021-12-21 12:51:42,424 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:51:42" (1/1) ... [2021-12-21 12:51:42,425 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:51:42" (1/1) ... [2021-12-21 12:51:42,430 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:51:42" (1/1) ... [2021-12-21 12:51:42,437 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:51:42" (1/1) ... [2021-12-21 12:51:42,437 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:51:42" (1/1) ... [2021-12-21 12:51:42,438 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-21 12:51:42,439 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-21 12:51:42,439 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-21 12:51:42,439 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-21 12:51:42,440 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:51:42" (1/1) ... [2021-12-21 12:51:42,446 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 12:51:42,456 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:42,468 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-21 12:51:42,470 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-21 12:51:42,506 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-21 12:51:42,507 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-21 12:51:42,507 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-21 12:51:42,508 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-21 12:51:42,508 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-12-21 12:51:42,508 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-12-21 12:51:42,554 INFO L234 CfgBuilder]: Building ICFG [2021-12-21 12:51:42,555 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-21 12:51:42,676 INFO L275 CfgBuilder]: Performing block encoding [2021-12-21 12:51:42,686 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-21 12:51:42,686 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-12-21 12:51:42,687 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 12:51:42 BoogieIcfgContainer [2021-12-21 12:51:42,688 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-21 12:51:42,689 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-21 12:51:42,690 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-21 12:51:42,692 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-21 12:51:42,693 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 12:51:42" (1/3) ... [2021-12-21 12:51:42,694 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ba1fec9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 12:51:42, skipping insertion in model container [2021-12-21 12:51:42,694 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:51:42" (2/3) ... [2021-12-21 12:51:42,695 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ba1fec9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 12:51:42, skipping insertion in model container [2021-12-21 12:51:42,695 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 12:51:42" (3/3) ... [2021-12-21 12:51:42,696 INFO L111 eAbstractionObserver]: Analyzing ICFG ps6-ll_unwindbound10.c [2021-12-21 12:51:42,700 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-21 12:51:42,700 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-21 12:51:42,746 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-21 12:51:42,753 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-21 12:51:42,754 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-21 12:51:42,771 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-21 12:51:42,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-12-21 12:51:42,779 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:42,780 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:42,781 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:42,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:42,786 INFO L85 PathProgramCache]: Analyzing trace with hash -579246775, now seen corresponding path program 1 times [2021-12-21 12:51:42,792 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:42,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1675377492] [2021-12-21 12:51:42,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:42,794 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:42,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:51:42,904 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:51:42,905 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:42,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1675377492] [2021-12-21 12:51:42,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1675377492] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:51:42,907 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 12:51:42,907 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-21 12:51:42,908 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411364740] [2021-12-21 12:51:42,909 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:51:42,912 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-21 12:51:42,912 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:42,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-21 12:51:42,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-21 12:51:42,938 INFO L87 Difference]: Start difference. First operand has 20 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 12:51:42,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:42,954 INFO L93 Difference]: Finished difference Result 37 states and 51 transitions. [2021-12-21 12:51:42,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-21 12:51:42,956 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-12-21 12:51:42,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:42,961 INFO L225 Difference]: With dead ends: 37 [2021-12-21 12:51:42,962 INFO L226 Difference]: Without dead ends: 16 [2021-12-21 12:51:42,964 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 [2021-12-21 12:51:42,966 INFO L933 BasicCegarLoop]: 23 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, 23 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 [2021-12-21 12:51:42,968 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:51:42,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-12-21 12:51:42,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-12-21 12:51:42,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-21 12:51:42,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2021-12-21 12:51:42,991 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 9 [2021-12-21 12:51:42,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:42,991 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2021-12-21 12:51:42,992 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 12:51:42,992 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2021-12-21 12:51:42,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-12-21 12:51:42,992 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:42,992 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:42,993 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-21 12:51:42,993 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:42,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:42,994 INFO L85 PathProgramCache]: Analyzing trace with hash -1986551203, now seen corresponding path program 1 times [2021-12-21 12:51:42,994 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:42,994 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2013437459] [2021-12-21 12:51:42,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:42,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:43,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:51:43,035 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:51:43,035 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:43,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2013437459] [2021-12-21 12:51:43,036 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2013437459] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:51:43,036 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 12:51:43,036 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-21 12:51:43,036 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247937143] [2021-12-21 12:51:43,036 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:51:43,037 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 12:51:43,037 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:43,038 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 12:51:43,038 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-21 12:51:43,038 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 12:51:43,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:43,050 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2021-12-21 12:51:43,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-21 12:51:43,051 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-12-21 12:51:43,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:43,052 INFO L225 Difference]: With dead ends: 26 [2021-12-21 12:51:43,052 INFO L226 Difference]: Without dead ends: 18 [2021-12-21 12:51:43,052 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-21 12:51:43,053 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:43,054 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 45 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:51:43,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-12-21 12:51:43,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-12-21 12:51:43,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-21 12:51:43,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2021-12-21 12:51:43,058 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 10 [2021-12-21 12:51:43,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:43,058 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2021-12-21 12:51:43,058 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 12:51:43,059 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2021-12-21 12:51:43,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-12-21 12:51:43,059 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:43,059 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:43,059 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-21 12:51:43,060 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:43,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:43,060 INFO L85 PathProgramCache]: Analyzing trace with hash -1984763743, now seen corresponding path program 1 times [2021-12-21 12:51:43,060 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:43,061 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [457025087] [2021-12-21 12:51:43,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:43,061 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:43,070 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:43,071 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1686145389] [2021-12-21 12:51:43,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:43,071 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:43,071 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:43,072 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:51:43,073 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-21 12:51:43,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:51:43,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-21 12:51:43,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:51:43,260 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:51:43,260 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 12:51:43,261 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:43,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [457025087] [2021-12-21 12:51:43,261 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:51:43,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1686145389] [2021-12-21 12:51:43,261 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1686145389] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:51:43,262 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 12:51:43,262 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-21 12:51:43,262 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347736076] [2021-12-21 12:51:43,262 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:51:43,262 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 12:51:43,263 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:43,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 12:51:43,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-21 12:51:43,265 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 12:51:43,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:43,331 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2021-12-21 12:51:43,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-21 12:51:43,331 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-12-21 12:51:43,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:43,332 INFO L225 Difference]: With dead ends: 28 [2021-12-21 12:51:43,332 INFO L226 Difference]: Without dead ends: 24 [2021-12-21 12:51:43,332 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-21 12:51:43,333 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 6 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:43,333 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 62 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:51:43,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-12-21 12:51:43,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-12-21 12:51:43,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 18 states have internal predecessors, (20), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-21 12:51:43,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-12-21 12:51:43,339 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 10 [2021-12-21 12:51:43,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:43,339 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-12-21 12:51:43,339 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 12:51:43,339 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-12-21 12:51:43,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-12-21 12:51:43,340 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:43,340 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:43,359 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-12-21 12:51:43,557 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:43,557 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:43,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:43,558 INFO L85 PathProgramCache]: Analyzing trace with hash -69803837, now seen corresponding path program 1 times [2021-12-21 12:51:43,558 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:43,558 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [794139248] [2021-12-21 12:51:43,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:43,558 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:43,582 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:43,582 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [211367145] [2021-12-21 12:51:43,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:43,588 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:43,589 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:43,590 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:51:43,612 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-21 12:51:43,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:51:43,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-21 12:51:43,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:51:43,731 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:51:43,731 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:51:43,792 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:51:43,792 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:43,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [794139248] [2021-12-21 12:51:43,793 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:51:43,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [211367145] [2021-12-21 12:51:43,793 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [211367145] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:51:43,793 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 12:51:43,793 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2021-12-21 12:51:43,793 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588813308] [2021-12-21 12:51:43,793 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 12:51:43,794 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-21 12:51:43,794 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:43,794 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-21 12:51:43,795 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-12-21 12:51:43,795 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 8 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-21 12:51:43,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:43,929 INFO L93 Difference]: Finished difference Result 58 states and 68 transitions. [2021-12-21 12:51:43,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-21 12:51:43,929 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 18 [2021-12-21 12:51:43,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:43,930 INFO L225 Difference]: With dead ends: 58 [2021-12-21 12:51:43,930 INFO L226 Difference]: Without dead ends: 50 [2021-12-21 12:51:43,931 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-12-21 12:51:43,931 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 41 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:43,932 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 93 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:51:43,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-12-21 12:51:43,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 46. [2021-12-21 12:51:43,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 31 states have (on average 1.2258064516129032) internal successors, (38), 34 states have internal predecessors, (38), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-21 12:51:43,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 55 transitions. [2021-12-21 12:51:43,939 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 55 transitions. Word has length 18 [2021-12-21 12:51:43,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:43,940 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 55 transitions. [2021-12-21 12:51:43,940 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-21 12:51:43,940 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 55 transitions. [2021-12-21 12:51:43,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-12-21 12:51:43,940 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:43,941 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:43,960 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-21 12:51:44,158 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2021-12-21 12:51:44,158 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:44,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:44,159 INFO L85 PathProgramCache]: Analyzing trace with hash -68016377, now seen corresponding path program 1 times [2021-12-21 12:51:44,159 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:44,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [947424596] [2021-12-21 12:51:44,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:44,159 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:44,166 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:44,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [891706382] [2021-12-21 12:51:44,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:44,167 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:44,167 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:44,168 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:51:44,177 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-21 12:51:44,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:51:44,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-21 12:51:44,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:51:44,289 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:51:44,289 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:51:44,507 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 12:51:44,508 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:44,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [947424596] [2021-12-21 12:51:44,508 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:51:44,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [891706382] [2021-12-21 12:51:44,508 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [891706382] provided 1 perfect and 1 imperfect interpolant sequences [2021-12-21 12:51:44,508 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:51:44,508 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2021-12-21 12:51:44,508 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655073178] [2021-12-21 12:51:44,508 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:51:44,509 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 12:51:44,509 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:44,509 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 12:51:44,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-12-21 12:51:44,509 INFO L87 Difference]: Start difference. First operand 46 states and 55 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 12:51:44,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:44,555 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2021-12-21 12:51:44,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-21 12:51:44,572 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-12-21 12:51:44,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:44,573 INFO L225 Difference]: With dead ends: 60 [2021-12-21 12:51:44,573 INFO L226 Difference]: Without dead ends: 52 [2021-12-21 12:51:44,573 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-12-21 12:51:44,574 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 7 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:44,574 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 47 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:51:44,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-12-21 12:51:44,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 46. [2021-12-21 12:51:44,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 33 states have (on average 1.121212121212121) internal successors, (37), 35 states have internal predecessors, (37), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-21 12:51:44,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2021-12-21 12:51:44,592 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 18 [2021-12-21 12:51:44,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:44,593 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2021-12-21 12:51:44,593 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 12:51:44,593 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2021-12-21 12:51:44,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-21 12:51:44,594 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:44,595 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:44,629 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-21 12:51:44,832 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:44,833 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:44,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:44,838 INFO L85 PathProgramCache]: Analyzing trace with hash 156635680, now seen corresponding path program 1 times [2021-12-21 12:51:44,838 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:44,838 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1584968477] [2021-12-21 12:51:44,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:44,839 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:44,846 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:44,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1217443622] [2021-12-21 12:51:44,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:44,851 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:44,851 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:44,859 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:51:44,860 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-21 12:51:44,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:51:44,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-21 12:51:44,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:51:45,059 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-21 12:51:45,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:51:45,226 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:45,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1584968477] [2021-12-21 12:51:45,227 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:51:45,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1217443622] [2021-12-21 12:51:45,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1217443622] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:51:45,227 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:51:45,227 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-12-21 12:51:45,227 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667712566] [2021-12-21 12:51:45,227 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:51:45,228 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-21 12:51:45,228 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:45,228 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-21 12:51:45,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-12-21 12:51:45,229 INFO L87 Difference]: Start difference. First operand 46 states and 52 transitions. Second operand has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-21 12:51:45,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:45,278 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2021-12-21 12:51:45,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-21 12:51:45,279 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 29 [2021-12-21 12:51:45,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:45,280 INFO L225 Difference]: With dead ends: 51 [2021-12-21 12:51:45,280 INFO L226 Difference]: Without dead ends: 45 [2021-12-21 12:51:45,281 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-12-21 12:51:45,281 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 2 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:45,282 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 111 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:51:45,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-12-21 12:51:45,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-12-21 12:51:45,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 34 states have internal predecessors, (36), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-21 12:51:45,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2021-12-21 12:51:45,289 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 29 [2021-12-21 12:51:45,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:45,289 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2021-12-21 12:51:45,290 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-21 12:51:45,290 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2021-12-21 12:51:45,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-12-21 12:51:45,290 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:45,291 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:45,310 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-21 12:51:45,503 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:45,504 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:45,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:45,504 INFO L85 PathProgramCache]: Analyzing trace with hash -1793229318, now seen corresponding path program 2 times [2021-12-21 12:51:45,504 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:45,504 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2077788699] [2021-12-21 12:51:45,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:45,504 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:45,512 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:45,515 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2132712376] [2021-12-21 12:51:45,515 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:51:45,515 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:45,515 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:45,527 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:51:45,528 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-21 12:51:45,612 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:51:45,612 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:51:45,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-21 12:51:45,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:51:45,793 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-12-21 12:51:45,793 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:51:45,901 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:45,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2077788699] [2021-12-21 12:51:45,901 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:51:45,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2132712376] [2021-12-21 12:51:45,902 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2132712376] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:51:45,902 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:51:45,902 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-12-21 12:51:45,902 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119104333] [2021-12-21 12:51:45,902 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:51:45,902 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-21 12:51:45,903 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:45,903 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-21 12:51:45,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-12-21 12:51:45,903 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-21 12:51:45,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:45,966 INFO L93 Difference]: Finished difference Result 50 states and 53 transitions. [2021-12-21 12:51:45,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-21 12:51:45,966 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 37 [2021-12-21 12:51:45,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:45,967 INFO L225 Difference]: With dead ends: 50 [2021-12-21 12:51:45,967 INFO L226 Difference]: Without dead ends: 44 [2021-12-21 12:51:45,967 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-12-21 12:51:45,968 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 2 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:45,968 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 150 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:51:45,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-12-21 12:51:45,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-12-21 12:51:45,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 33 states have internal predecessors, (35), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-21 12:51:45,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2021-12-21 12:51:45,974 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 37 [2021-12-21 12:51:45,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:45,974 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2021-12-21 12:51:45,974 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-21 12:51:45,974 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2021-12-21 12:51:45,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-21 12:51:45,975 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:45,975 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:45,984 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-12-21 12:51:46,180 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:46,181 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:46,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:46,181 INFO L85 PathProgramCache]: Analyzing trace with hash 1183870932, now seen corresponding path program 3 times [2021-12-21 12:51:46,181 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:46,181 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1034798539] [2021-12-21 12:51:46,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:46,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:46,189 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:46,201 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2025847013] [2021-12-21 12:51:46,201 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:51:46,202 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:46,202 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:46,203 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:51:46,205 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-21 12:51:47,353 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-12-21 12:51:47,354 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:51:47,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-21 12:51:47,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:51:47,528 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 10 proven. 24 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-12-21 12:51:47,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:51:47,673 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:47,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1034798539] [2021-12-21 12:51:47,674 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:51:47,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2025847013] [2021-12-21 12:51:47,674 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2025847013] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:51:47,674 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:51:47,674 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-12-21 12:51:47,675 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188425447] [2021-12-21 12:51:47,675 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:51:47,675 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-21 12:51:47,675 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:47,675 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-21 12:51:47,675 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-12-21 12:51:47,676 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand has 9 states, 8 states have (on average 2.75) internal successors, (22), 8 states have internal predecessors, (22), 5 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-21 12:51:47,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:47,748 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2021-12-21 12:51:47,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-21 12:51:47,748 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.75) internal successors, (22), 8 states have internal predecessors, (22), 5 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 45 [2021-12-21 12:51:47,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:47,749 INFO L225 Difference]: With dead ends: 52 [2021-12-21 12:51:47,749 INFO L226 Difference]: Without dead ends: 46 [2021-12-21 12:51:47,749 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-12-21 12:51:47,750 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 2 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:47,750 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 202 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:51:47,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-12-21 12:51:47,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-12-21 12:51:47,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-21 12:51:47,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2021-12-21 12:51:47,755 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 45 [2021-12-21 12:51:47,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:47,756 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2021-12-21 12:51:47,756 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.75) internal successors, (22), 8 states have internal predecessors, (22), 5 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-21 12:51:47,756 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2021-12-21 12:51:47,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-21 12:51:47,757 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:47,757 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:47,768 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-21 12:51:47,962 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:47,963 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:47,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:47,963 INFO L85 PathProgramCache]: Analyzing trace with hash -1854611729, now seen corresponding path program 1 times [2021-12-21 12:51:47,964 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:47,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1450236466] [2021-12-21 12:51:47,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:47,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:47,971 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:47,972 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [473638409] [2021-12-21 12:51:47,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:47,972 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:47,972 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:47,973 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:51:47,974 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-21 12:51:48,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:51:48,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-21 12:51:48,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:51:48,109 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-21 12:51:48,109 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:51:48,199 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 10 proven. 32 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-12-21 12:51:48,200 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:48,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1450236466] [2021-12-21 12:51:48,200 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:51:48,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [473638409] [2021-12-21 12:51:48,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [473638409] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:51:48,200 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 12:51:48,200 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2021-12-21 12:51:48,200 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538215506] [2021-12-21 12:51:48,201 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 12:51:48,211 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-12-21 12:51:48,212 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:48,212 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-12-21 12:51:48,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-12-21 12:51:48,212 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand has 14 states, 14 states have (on average 4.0) internal successors, (56), 14 states have internal predecessors, (56), 9 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2021-12-21 12:51:48,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:48,351 INFO L93 Difference]: Finished difference Result 132 states and 144 transitions. [2021-12-21 12:51:48,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-12-21 12:51:48,352 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.0) internal successors, (56), 14 states have internal predecessors, (56), 9 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) Word has length 47 [2021-12-21 12:51:48,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:48,352 INFO L225 Difference]: With dead ends: 132 [2021-12-21 12:51:48,352 INFO L226 Difference]: Without dead ends: 122 [2021-12-21 12:51:48,353 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2021-12-21 12:51:48,353 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 107 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:48,353 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 159 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:51:48,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-12-21 12:51:48,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 97. [2021-12-21 12:51:48,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 69 states have (on average 1.1014492753623188) internal successors, (76), 74 states have internal predecessors, (76), 17 states have call successors, (17), 11 states have call predecessors, (17), 10 states have return successors, (16), 11 states have call predecessors, (16), 16 states have call successors, (16) [2021-12-21 12:51:48,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 109 transitions. [2021-12-21 12:51:48,370 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 109 transitions. Word has length 47 [2021-12-21 12:51:48,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:48,371 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 109 transitions. [2021-12-21 12:51:48,371 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.0) internal successors, (56), 14 states have internal predecessors, (56), 9 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2021-12-21 12:51:48,371 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 109 transitions. [2021-12-21 12:51:48,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-12-21 12:51:48,372 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:48,372 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:48,392 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-21 12:51:48,589 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:48,590 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:48,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:48,590 INFO L85 PathProgramCache]: Analyzing trace with hash 348710830, now seen corresponding path program 4 times [2021-12-21 12:51:48,590 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:48,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [334715384] [2021-12-21 12:51:48,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:48,590 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:48,596 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:48,596 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [873118110] [2021-12-21 12:51:48,596 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 12:51:48,597 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:48,597 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:48,602 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:51:48,629 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-21 12:51:48,634 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 12:51:48,635 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:51:48,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-21 12:51:48,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:51:48,807 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 12 proven. 40 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-12-21 12:51:48,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:51:48,968 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:51:48,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [334715384] [2021-12-21 12:51:48,968 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:51:48,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [873118110] [2021-12-21 12:51:48,968 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [873118110] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:51:48,968 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:51:48,968 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-12-21 12:51:48,968 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1246157518] [2021-12-21 12:51:48,968 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:51:48,969 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-21 12:51:48,969 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:51:48,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-21 12:51:48,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-12-21 12:51:48,969 INFO L87 Difference]: Start difference. First operand 97 states and 109 transitions. Second operand has 10 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-21 12:51:49,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:51:49,077 INFO L93 Difference]: Finished difference Result 102 states and 113 transitions. [2021-12-21 12:51:49,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-21 12:51:49,078 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 53 [2021-12-21 12:51:49,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:51:49,079 INFO L225 Difference]: With dead ends: 102 [2021-12-21 12:51:49,079 INFO L226 Difference]: Without dead ends: 96 [2021-12-21 12:51:49,079 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-12-21 12:51:49,080 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 2 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 246 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:51:49,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 246 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:51:49,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-12-21 12:51:49,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2021-12-21 12:51:49,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 69 states have (on average 1.0869565217391304) internal successors, (75), 73 states have internal predecessors, (75), 16 states have call successors, (16), 11 states have call predecessors, (16), 10 states have return successors, (15), 11 states have call predecessors, (15), 15 states have call successors, (15) [2021-12-21 12:51:49,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 106 transitions. [2021-12-21 12:51:49,089 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 106 transitions. Word has length 53 [2021-12-21 12:51:49,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:51:49,090 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 106 transitions. [2021-12-21 12:51:49,090 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-21 12:51:49,090 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 106 transitions. [2021-12-21 12:51:49,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-12-21 12:51:49,091 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:51:49,091 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:51:49,108 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-12-21 12:51:49,308 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,SelfDestructingSolverStorable9 [2021-12-21 12:51:49,308 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:51:49,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:51:49,309 INFO L85 PathProgramCache]: Analyzing trace with hash 1021371784, now seen corresponding path program 5 times [2021-12-21 12:51:49,309 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:51:49,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [431332791] [2021-12-21 12:51:49,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:51:49,309 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:51:49,315 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:51:49,315 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1752989895] [2021-12-21 12:51:49,315 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 12:51:49,315 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:51:49,315 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:51:49,329 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:51:49,330 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-21 12:51:49,838 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-12-21 12:51:49,838 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:51:49,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 39 conjunts are in the unsatisfiable core [2021-12-21 12:51:49,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:51:50,135 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 39 proven. 65 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-12-21 12:51:50,136 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:52:13,223 WARN L838 $PredicateComparison]: unable to prove that (or (not (= (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 18) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 120) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 2) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 119) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 65)) 12) 0)) (forall ((|ULTIMATE.start_main_~k~0#1| Int)) (or (let ((.cse0 (+ |c_ULTIMATE.start_main_~y~0#1| 1))) (= (* |ULTIMATE.start_main_~k~0#1| .cse0) (* .cse0 .cse0))) (not (< |c_ULTIMATE.start_main_~c~0#1| |ULTIMATE.start_main_~k~0#1|)) (< (+ |c_ULTIMATE.start_main_~c~0#1| 1) |ULTIMATE.start_main_~k~0#1|)))) is different from false [2021-12-21 12:52:13,225 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:52:13,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [431332791] [2021-12-21 12:52:13,225 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:52:13,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1752989895] [2021-12-21 12:52:13,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1752989895] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:52:13,226 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:52:13,226 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-12-21 12:52:13,226 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456298761] [2021-12-21 12:52:13,226 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:52:13,226 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-21 12:52:13,226 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:52:13,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-21 12:52:13,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=315, Unknown=5, NotChecked=36, Total=420 [2021-12-21 12:52:13,227 INFO L87 Difference]: Start difference. First operand 96 states and 106 transitions. Second operand has 15 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 states have internal predecessors, (31), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-21 12:52:13,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:52:13,422 INFO L93 Difference]: Finished difference Result 101 states and 110 transitions. [2021-12-21 12:52:13,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-12-21 12:52:13,422 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 states have internal predecessors, (31), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 61 [2021-12-21 12:52:13,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:52:13,423 INFO L225 Difference]: With dead ends: 101 [2021-12-21 12:52:13,423 INFO L226 Difference]: Without dead ends: 95 [2021-12-21 12:52:13,424 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 19.0s TimeCoverageRelationStatistics Valid=85, Invalid=420, Unknown=5, NotChecked=42, Total=552 [2021-12-21 12:52:13,424 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 6 mSDsluCounter, 303 mSDsCounter, 0 mSdLazyCounter, 288 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 331 SdHoareTripleChecker+Invalid, 292 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 288 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:52:13,424 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 331 Invalid, 292 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 288 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:52:13,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-12-21 12:52:13,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2021-12-21 12:52:13,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 69 states have (on average 1.0724637681159421) internal successors, (74), 72 states have internal predecessors, (74), 15 states have call successors, (15), 11 states have call predecessors, (15), 10 states have return successors, (14), 11 states have call predecessors, (14), 14 states have call successors, (14) [2021-12-21 12:52:13,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 103 transitions. [2021-12-21 12:52:13,433 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 103 transitions. Word has length 61 [2021-12-21 12:52:13,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:52:13,433 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 103 transitions. [2021-12-21 12:52:13,433 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 states have internal predecessors, (31), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-21 12:52:13,433 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 103 transitions. [2021-12-21 12:52:13,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-12-21 12:52:13,434 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:52:13,434 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:52:13,439 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-12-21 12:52:13,639 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:52:13,639 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:52:13,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:52:13,640 INFO L85 PathProgramCache]: Analyzing trace with hash 1106405730, now seen corresponding path program 6 times [2021-12-21 12:52:13,640 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:52:13,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2100641290] [2021-12-21 12:52:13,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:52:13,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:52:13,659 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:52:13,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [97996767] [2021-12-21 12:52:13,662 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 12:52:13,662 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:52:13,662 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:52:13,671 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:52:13,672 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-21 12:52:14,293 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-12-21 12:52:14,293 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:52:14,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 32 conjunts are in the unsatisfiable core [2021-12-21 12:52:14,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:52:14,568 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 16 proven. 84 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-12-21 12:52:14,569 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:52:14,776 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:52:14,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2100641290] [2021-12-21 12:52:14,776 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:52:14,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [97996767] [2021-12-21 12:52:14,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [97996767] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:52:14,776 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:52:14,776 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-12-21 12:52:14,776 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265605772] [2021-12-21 12:52:14,776 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:52:14,777 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-21 12:52:14,777 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:52:14,777 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-21 12:52:14,777 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-12-21 12:52:14,777 INFO L87 Difference]: Start difference. First operand 95 states and 103 transitions. Second operand has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 11 states have internal predecessors, (31), 8 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-21 12:52:14,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:52:14,915 INFO L93 Difference]: Finished difference Result 100 states and 107 transitions. [2021-12-21 12:52:14,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-21 12:52:14,915 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 11 states have internal predecessors, (31), 8 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Word has length 69 [2021-12-21 12:52:14,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:52:14,916 INFO L225 Difference]: With dead ends: 100 [2021-12-21 12:52:14,916 INFO L226 Difference]: Without dead ends: 94 [2021-12-21 12:52:14,916 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2021-12-21 12:52:14,917 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 2 mSDsluCounter, 323 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 366 SdHoareTripleChecker+Invalid, 175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:52:14,917 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 366 Invalid, 175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:52:14,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-12-21 12:52:14,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2021-12-21 12:52:14,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 69 states have (on average 1.0579710144927537) internal successors, (73), 71 states have internal predecessors, (73), 14 states have call successors, (14), 11 states have call predecessors, (14), 10 states have return successors, (13), 11 states have call predecessors, (13), 13 states have call successors, (13) [2021-12-21 12:52:14,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 100 transitions. [2021-12-21 12:52:14,925 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 100 transitions. Word has length 69 [2021-12-21 12:52:14,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:52:14,925 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 100 transitions. [2021-12-21 12:52:14,926 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 11 states have internal predecessors, (31), 8 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-21 12:52:14,926 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 100 transitions. [2021-12-21 12:52:14,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-12-21 12:52:14,926 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:52:14,927 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:52:14,939 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-12-21 12:52:15,131 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,SelfDestructingSolverStorable11 [2021-12-21 12:52:15,131 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:52:15,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:52:15,132 INFO L85 PathProgramCache]: Analyzing trace with hash -317230276, now seen corresponding path program 7 times [2021-12-21 12:52:15,132 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:52:15,132 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [752280890] [2021-12-21 12:52:15,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:52:15,132 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:52:15,138 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:52:15,138 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [369596718] [2021-12-21 12:52:15,138 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 12:52:15,138 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:52:15,138 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:52:15,155 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:52:15,156 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-21 12:52:15,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:52:15,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 36 conjunts are in the unsatisfiable core [2021-12-21 12:52:15,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:52:16,050 INFO L134 CoverageAnalysis]: Checked inductivity of 274 backedges. 18 proven. 112 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-12-21 12:52:16,050 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:52:16,176 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:52:16,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [752280890] [2021-12-21 12:52:16,177 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:52:16,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [369596718] [2021-12-21 12:52:16,177 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [369596718] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:52:16,177 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:52:16,177 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-12-21 12:52:16,177 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041497508] [2021-12-21 12:52:16,177 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:52:16,177 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-21 12:52:16,177 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:52:16,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-21 12:52:16,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2021-12-21 12:52:16,178 INFO L87 Difference]: Start difference. First operand 94 states and 100 transitions. Second operand has 13 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 states have internal predecessors, (34), 9 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-21 12:52:16,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:52:16,319 INFO L93 Difference]: Finished difference Result 99 states and 104 transitions. [2021-12-21 12:52:16,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-21 12:52:16,319 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 states have internal predecessors, (34), 9 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Word has length 77 [2021-12-21 12:52:16,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:52:16,320 INFO L225 Difference]: With dead ends: 99 [2021-12-21 12:52:16,320 INFO L226 Difference]: Without dead ends: 93 [2021-12-21 12:52:16,320 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 80 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-12-21 12:52:16,320 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 2 mSDsluCounter, 388 mSDsCounter, 0 mSdLazyCounter, 213 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 435 SdHoareTripleChecker+Invalid, 214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 213 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:52:16,321 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 435 Invalid, 214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 213 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:52:16,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-12-21 12:52:16,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2021-12-21 12:52:16,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 69 states have (on average 1.0434782608695652) internal successors, (72), 70 states have internal predecessors, (72), 13 states have call successors, (13), 11 states have call predecessors, (13), 10 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-21 12:52:16,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 97 transitions. [2021-12-21 12:52:16,327 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 97 transitions. Word has length 77 [2021-12-21 12:52:16,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:52:16,327 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 97 transitions. [2021-12-21 12:52:16,327 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 states have internal predecessors, (34), 9 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-21 12:52:16,327 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 97 transitions. [2021-12-21 12:52:16,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-12-21 12:52:16,328 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:52:16,328 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:52:16,335 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-12-21 12:52:16,533 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,SelfDestructingSolverStorable12 [2021-12-21 12:52:16,534 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:52:16,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:52:16,534 INFO L85 PathProgramCache]: Analyzing trace with hash 1298793238, now seen corresponding path program 8 times [2021-12-21 12:52:16,534 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:52:16,534 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [942618530] [2021-12-21 12:52:16,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:52:16,534 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:52:16,549 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:52:16,552 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [817052817] [2021-12-21 12:52:16,553 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:52:16,553 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:52:16,553 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:52:16,554 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:52:16,556 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-21 12:52:17,279 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:52:17,279 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:52:17,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 40 conjunts are in the unsatisfiable core [2021-12-21 12:52:17,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:52:17,620 INFO L134 CoverageAnalysis]: Checked inductivity of 344 backedges. 20 proven. 144 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-12-21 12:52:17,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:52:17,767 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:52:17,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [942618530] [2021-12-21 12:52:17,767 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 12:52:17,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [817052817] [2021-12-21 12:52:17,767 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [817052817] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:52:17,767 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:52:17,767 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-12-21 12:52:17,767 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [306964509] [2021-12-21 12:52:17,767 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 12:52:17,768 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-12-21 12:52:17,768 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:52:17,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-12-21 12:52:17,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-12-21 12:52:17,768 INFO L87 Difference]: Start difference. First operand 93 states and 97 transitions. Second operand has 14 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 13 states have internal predecessors, (37), 10 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-21 12:52:17,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:52:17,960 INFO L93 Difference]: Finished difference Result 98 states and 101 transitions. [2021-12-21 12:52:17,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-12-21 12:52:17,961 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 13 states have internal predecessors, (37), 10 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Word has length 85 [2021-12-21 12:52:17,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:52:17,962 INFO L225 Difference]: With dead ends: 98 [2021-12-21 12:52:17,962 INFO L226 Difference]: Without dead ends: 92 [2021-12-21 12:52:17,962 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 87 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2021-12-21 12:52:17,962 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 2 mSDsluCounter, 459 mSDsCounter, 0 mSdLazyCounter, 256 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 510 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 256 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 12:52:17,962 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 510 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 256 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 12:52:17,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-12-21 12:52:17,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2021-12-21 12:52:17,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 69 states have (on average 1.0289855072463767) internal successors, (71), 69 states have internal predecessors, (71), 12 states have call successors, (12), 11 states have call predecessors, (12), 10 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-12-21 12:52:17,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2021-12-21 12:52:17,968 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 85 [2021-12-21 12:52:17,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:52:17,969 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2021-12-21 12:52:17,969 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 13 states have internal predecessors, (37), 10 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-21 12:52:17,969 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2021-12-21 12:52:17,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-12-21 12:52:17,969 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:52:17,970 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:52:17,978 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-12-21 12:52:18,170 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,SelfDestructingSolverStorable13 [2021-12-21 12:52:18,170 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:52:18,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:52:18,171 INFO L85 PathProgramCache]: Analyzing trace with hash -1207691024, now seen corresponding path program 9 times [2021-12-21 12:52:18,171 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:52:18,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [919695538] [2021-12-21 12:52:18,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:52:18,171 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:52:18,177 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-21 12:52:18,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1220946938] [2021-12-21 12:52:18,180 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:52:18,180 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:52:18,181 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:52:18,181 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:52:18,182 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process