./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/bitvector-regression/recHanoi03-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 47ea0209 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/bitvector-regression/recHanoi03-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8 --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 Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 5a58a565ed7a29809aaccd8966118196fec0a697f2fc6db04cc260beeab4df83 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 01:50:02,110 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 01:50:02,111 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 01:50:02,152 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 01:50:02,153 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 01:50:02,154 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 01:50:02,161 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 01:50:02,167 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 01:50:02,169 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 01:50:02,172 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 01:50:02,173 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 01:50:02,174 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 01:50:02,176 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 01:50:02,179 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 01:50:02,181 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 01:50:02,184 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 01:50:02,187 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 01:50:02,194 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 01:50:02,196 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 01:50:02,204 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 01:50:02,206 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 01:50:02,207 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 01:50:02,209 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 01:50:02,215 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 01:50:02,218 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 01:50:02,221 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 01:50:02,221 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 01:50:02,222 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 01:50:02,224 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 01:50:02,225 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 01:50:02,226 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 01:50:02,227 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 01:50:02,228 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 01:50:02,229 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 01:50:02,231 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 01:50:02,232 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 01:50:02,233 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 01:50:02,233 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 01:50:02,233 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 01:50:02,234 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 01:50:02,235 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 01:50:02,236 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 01:50:02,280 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 01:50:02,280 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 01:50:02,281 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 01:50:02,281 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 01:50:02,282 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 01:50:02,282 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 01:50:02,282 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 01:50:02,282 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 01:50:02,283 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 01:50:02,283 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 01:50:02,283 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 01:50:02,283 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 01:50:02,283 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 01:50:02,284 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 01:50:02,284 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 01:50:02,285 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 01:50:02,285 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 01:50:02,285 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 01:50:02,285 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 01:50:02,285 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 01:50:02,286 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 01:50:02,286 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 01:50:02,289 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 01:50:02,289 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 01:50:02,289 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 01:50:02,290 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 01:50:02,290 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 01:50:02,290 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 01:50:02,291 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 01:50:02,292 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 01:50:02,292 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:50:02,293 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 01:50:02,293 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 01:50:02,293 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 01:50:02,294 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 01:50:02,294 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 01:50:02,295 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 01:50:02,295 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 01:50:02,295 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 01:50:02,295 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5a58a565ed7a29809aaccd8966118196fec0a697f2fc6db04cc260beeab4df83 [2021-11-07 01:50:02,593 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:50:02,613 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:50:02,615 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:50:02,618 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:50:02,619 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:50:02,620 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/bitvector-regression/recHanoi03-1.c [2021-11-07 01:50:02,710 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/data/db6a534b7/e0e7835d24da48daba97cc53755a0796/FLAG25deba8b1 [2021-11-07 01:50:03,108 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:50:03,108 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/sv-benchmarks/c/bitvector-regression/recHanoi03-1.c [2021-11-07 01:50:03,114 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/data/db6a534b7/e0e7835d24da48daba97cc53755a0796/FLAG25deba8b1 [2021-11-07 01:50:03,522 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/data/db6a534b7/e0e7835d24da48daba97cc53755a0796 [2021-11-07 01:50:03,524 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:50:03,526 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:50:03,543 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:50:03,543 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:50:03,546 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:50:03,547 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:50:03" (1/1) ... [2021-11-07 01:50:03,548 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3e56a7b9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:03, skipping insertion in model container [2021-11-07 01:50:03,548 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:50:03" (1/1) ... [2021-11-07 01:50:03,555 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:50:03,567 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:50:03,725 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/sv-benchmarks/c/bitvector-regression/recHanoi03-1.c[838,851] [2021-11-07 01:50:03,727 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:50:03,735 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 01:50:03,749 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/sv-benchmarks/c/bitvector-regression/recHanoi03-1.c[838,851] [2021-11-07 01:50:03,750 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:50:03,763 INFO L208 MainTranslator]: Completed translation [2021-11-07 01:50:03,763 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:03 WrapperNode [2021-11-07 01:50:03,763 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:50:03,764 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 01:50:03,765 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 01:50:03,765 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 01:50:03,772 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:03" (1/1) ... [2021-11-07 01:50:03,778 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:03" (1/1) ... [2021-11-07 01:50:03,794 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 01:50:03,795 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 01:50:03,795 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 01:50:03,795 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 01:50:03,801 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:03" (1/1) ... [2021-11-07 01:50:03,801 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:03" (1/1) ... [2021-11-07 01:50:03,802 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:03" (1/1) ... [2021-11-07 01:50:03,803 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:03" (1/1) ... [2021-11-07 01:50:03,806 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:03" (1/1) ... [2021-11-07 01:50:03,808 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:03" (1/1) ... [2021-11-07 01:50:03,809 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:03" (1/1) ... [2021-11-07 01:50:03,810 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 01:50:03,811 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 01:50:03,811 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 01:50:03,811 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 01:50:03,812 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:03" (1/1) ... [2021-11-07 01:50:03,819 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:50:03,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:50:03,839 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 01:50:03,841 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 01:50:03,880 INFO L130 BoogieDeclarations]: Found specification of procedure hanoi [2021-11-07 01:50:03,881 INFO L138 BoogieDeclarations]: Found implementation of procedure hanoi [2021-11-07 01:50:03,883 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 01:50:03,883 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 01:50:03,883 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-07 01:50:03,883 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 01:50:04,071 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 01:50:04,071 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-07 01:50:04,074 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:50:04 BoogieIcfgContainer [2021-11-07 01:50:04,074 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 01:50:04,076 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 01:50:04,076 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 01:50:04,079 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 01:50:04,079 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:50:03" (1/3) ... [2021-11-07 01:50:04,080 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28f8de23 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:50:04, skipping insertion in model container [2021-11-07 01:50:04,080 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:03" (2/3) ... [2021-11-07 01:50:04,080 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28f8de23 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:50:04, skipping insertion in model container [2021-11-07 01:50:04,080 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:50:04" (3/3) ... [2021-11-07 01:50:04,082 INFO L111 eAbstractionObserver]: Analyzing ICFG recHanoi03-1.c [2021-11-07 01:50:04,087 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 01:50:04,087 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-07 01:50:04,131 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 01:50:04,137 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=FINITE_AUTOMATA, 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 [2021-11-07 01:50:04,138 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-07 01:50:04,154 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-07 01:50:04,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-07 01:50:04,159 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:50:04,159 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:50:04,160 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:50:04,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:50:04,165 INFO L85 PathProgramCache]: Analyzing trace with hash 1546859687, now seen corresponding path program 1 times [2021-11-07 01:50:04,174 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:50:04,175 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1313671716] [2021-11-07 01:50:04,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:50:04,176 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:50:04,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-07 01:50:04,338 INFO L355 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-11-07 01:50:04,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-07 01:50:04,396 INFO L133 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2021-11-07 01:50:04,399 INFO L627 BasicCegarLoop]: Counterexample is feasible [2021-11-07 01:50:04,401 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-11-07 01:50:04,405 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-07 01:50:04,409 INFO L731 BasicCegarLoop]: Path program histogram: [1] [2021-11-07 01:50:04,411 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-07 01:50:04,438 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 01:50:04 BoogieIcfgContainer [2021-11-07 01:50:04,439 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-07 01:50:04,442 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-07 01:50:04,442 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-07 01:50:04,443 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-07 01:50:04,443 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:50:04" (3/4) ... [2021-11-07 01:50:04,447 INFO L140 WitnessPrinter]: No result that supports witness generation found [2021-11-07 01:50:04,447 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-07 01:50:04,452 INFO L168 Benchmark]: Toolchain (without parser) took 922.08 ms. Allocated memory is still 119.5 MB. Free memory was 85.7 MB in the beginning and 69.2 MB in the end (delta: 16.6 MB). Peak memory consumption was 13.7 MB. Max. memory is 16.1 GB. [2021-11-07 01:50:04,453 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 77.6 MB. Free memory was 51.4 MB in the beginning and 51.3 MB in the end (delta: 29.4 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 01:50:04,455 INFO L168 Benchmark]: CACSL2BoogieTranslator took 221.06 ms. Allocated memory is still 119.5 MB. Free memory was 85.5 MB in the beginning and 96.3 MB in the end (delta: -10.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-11-07 01:50:04,455 INFO L168 Benchmark]: Boogie Procedure Inliner took 29.73 ms. Allocated memory is still 119.5 MB. Free memory was 96.3 MB in the beginning and 94.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-11-07 01:50:04,457 INFO L168 Benchmark]: Boogie Preprocessor took 15.42 ms. Allocated memory is still 119.5 MB. Free memory was 94.9 MB in the beginning and 94.3 MB in the end (delta: 637.9 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 01:50:04,458 INFO L168 Benchmark]: RCFGBuilder took 262.99 ms. Allocated memory is still 119.5 MB. Free memory was 94.3 MB in the beginning and 83.8 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-11-07 01:50:04,463 INFO L168 Benchmark]: TraceAbstraction took 363.32 ms. Allocated memory is still 119.5 MB. Free memory was 83.5 MB in the beginning and 69.8 MB in the end (delta: 13.8 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-11-07 01:50:04,465 INFO L168 Benchmark]: Witness Printer took 5.00 ms. Allocated memory is still 119.5 MB. Free memory was 69.8 MB in the beginning and 69.2 MB in the end (delta: 602.3 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 01:50:04,470 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 77.6 MB. Free memory was 51.4 MB in the beginning and 51.3 MB in the end (delta: 29.4 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 221.06 ms. Allocated memory is still 119.5 MB. Free memory was 85.5 MB in the beginning and 96.3 MB in the end (delta: -10.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 29.73 ms. Allocated memory is still 119.5 MB. Free memory was 96.3 MB in the beginning and 94.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 15.42 ms. Allocated memory is still 119.5 MB. Free memory was 94.9 MB in the beginning and 94.3 MB in the end (delta: 637.9 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 262.99 ms. Allocated memory is still 119.5 MB. Free memory was 94.3 MB in the beginning and 83.8 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 363.32 ms. Allocated memory is still 119.5 MB. Free memory was 83.5 MB in the beginning and 69.8 MB in the end (delta: 13.8 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * Witness Printer took 5.00 ms. Allocated memory is still 119.5 MB. Free memory was 69.8 MB in the beginning and 69.2 MB in the end (delta: 602.3 kB). There was no memory consumed. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - UnprovableResult [Line: 36]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: overapproximation of shiftLeft at line 33. Possible FailurePath: [L27] int n = __VERIFIER_nondet_int(); [L28] COND FALSE !(n < 1) [L31] CALL, EXPR hanoi(n) VAL [\old(n)=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L31] RET, EXPR hanoi(n) [L31] unsigned result = hanoi(n); [L33] COND FALSE !(result+1>0 && result+1 == 1< main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8 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 -> Taipan 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 -> 5a58a565ed7a29809aaccd8966118196fec0a697f2fc6db04cc260beeab4df83 [2021-11-07 01:50:07,362 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:50:07,396 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:50:07,398 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:50:07,399 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:50:07,401 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:50:07,402 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/bitvector-regression/recHanoi03-1.c [2021-11-07 01:50:07,479 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/data/f5c8eb602/552e5cde348f49c182c18c0b4e8c6c97/FLAGe3d5bec9f [2021-11-07 01:50:07,995 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:50:07,995 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/sv-benchmarks/c/bitvector-regression/recHanoi03-1.c [2021-11-07 01:50:08,002 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/data/f5c8eb602/552e5cde348f49c182c18c0b4e8c6c97/FLAGe3d5bec9f [2021-11-07 01:50:08,318 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/data/f5c8eb602/552e5cde348f49c182c18c0b4e8c6c97 [2021-11-07 01:50:08,320 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:50:08,322 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:50:08,323 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:50:08,323 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:50:08,327 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:50:08,328 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:50:08" (1/1) ... [2021-11-07 01:50:08,329 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@755a9867 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:08, skipping insertion in model container [2021-11-07 01:50:08,329 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:50:08" (1/1) ... [2021-11-07 01:50:08,337 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:50:08,349 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:50:08,486 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/sv-benchmarks/c/bitvector-regression/recHanoi03-1.c[838,851] [2021-11-07 01:50:08,488 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:50:08,500 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 01:50:08,515 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/sv-benchmarks/c/bitvector-regression/recHanoi03-1.c[838,851] [2021-11-07 01:50:08,516 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:50:08,529 INFO L208 MainTranslator]: Completed translation [2021-11-07 01:50:08,529 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:08 WrapperNode [2021-11-07 01:50:08,530 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:50:08,531 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 01:50:08,531 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 01:50:08,531 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 01:50:08,538 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:08" (1/1) ... [2021-11-07 01:50:08,546 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:08" (1/1) ... [2021-11-07 01:50:08,562 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 01:50:08,562 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 01:50:08,563 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 01:50:08,563 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 01:50:08,570 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:08" (1/1) ... [2021-11-07 01:50:08,571 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:08" (1/1) ... [2021-11-07 01:50:08,573 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:08" (1/1) ... [2021-11-07 01:50:08,573 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:08" (1/1) ... [2021-11-07 01:50:08,578 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:08" (1/1) ... [2021-11-07 01:50:08,580 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:08" (1/1) ... [2021-11-07 01:50:08,581 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:08" (1/1) ... [2021-11-07 01:50:08,583 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 01:50:08,584 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 01:50:08,584 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 01:50:08,584 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 01:50:08,585 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:08" (1/1) ... [2021-11-07 01:50:08,591 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:50:08,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:50:08,626 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 01:50:08,642 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 01:50:08,686 INFO L130 BoogieDeclarations]: Found specification of procedure hanoi [2021-11-07 01:50:08,687 INFO L138 BoogieDeclarations]: Found implementation of procedure hanoi [2021-11-07 01:50:08,687 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 01:50:08,687 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 01:50:08,687 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-07 01:50:08,687 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 01:50:08,883 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 01:50:08,884 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-07 01:50:08,886 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:50:08 BoogieIcfgContainer [2021-11-07 01:50:08,886 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 01:50:08,888 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 01:50:08,888 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 01:50:08,891 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 01:50:08,891 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:50:08" (1/3) ... [2021-11-07 01:50:08,892 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f33301 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:50:08, skipping insertion in model container [2021-11-07 01:50:08,892 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:50:08" (2/3) ... [2021-11-07 01:50:08,892 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f33301 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:50:08, skipping insertion in model container [2021-11-07 01:50:08,892 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:50:08" (3/3) ... [2021-11-07 01:50:08,894 INFO L111 eAbstractionObserver]: Analyzing ICFG recHanoi03-1.c [2021-11-07 01:50:08,899 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 01:50:08,899 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-07 01:50:08,946 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 01:50:08,952 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=FINITE_AUTOMATA, 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 [2021-11-07 01:50:08,953 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-07 01:50:08,967 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-07 01:50:08,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-07 01:50:08,972 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:50:08,973 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:50:08,973 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:50:08,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:50:08,979 INFO L85 PathProgramCache]: Analyzing trace with hash -2087939196, now seen corresponding path program 1 times [2021-11-07 01:50:08,990 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:50:08,991 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1360897066] [2021-11-07 01:50:08,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:50:08,992 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:50:08,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:50:08,995 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:50:09,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-07 01:50:09,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:50:09,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:50:09,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:50:09,328 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:50:09,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:50:09,717 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:50:09,718 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:50:09,719 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1360897066] [2021-11-07 01:50:09,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1360897066] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:50:09,720 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:50:09,720 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 6] imperfect sequences [] total 11 [2021-11-07 01:50:09,722 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836984133] [2021-11-07 01:50:09,726 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-07 01:50:09,728 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:50:09,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-07 01:50:09,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-11-07 01:50:09,748 INFO L87 Difference]: Start difference. First operand has 17 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-07 01:50:09,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:50:09,960 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2021-11-07 01:50:09,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 01:50:09,965 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 11 [2021-11-07 01:50:09,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:50:09,973 INFO L225 Difference]: With dead ends: 32 [2021-11-07 01:50:09,973 INFO L226 Difference]: Without dead ends: 16 [2021-11-07 01:50:09,978 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-11-07 01:50:09,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-07 01:50:10,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-11-07 01:50:10,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 12 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-07 01:50:10,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-11-07 01:50:10,016 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2021-11-07 01:50:10,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:50:10,016 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-11-07 01:50:10,017 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-07 01:50:10,017 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-11-07 01:50:10,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-07 01:50:10,019 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:50:10,019 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:50:10,034 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-07 01:50:10,229 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:50:10,229 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:50:10,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:50:10,230 INFO L85 PathProgramCache]: Analyzing trace with hash -2053638732, now seen corresponding path program 1 times [2021-11-07 01:50:10,232 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:50:10,233 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1248224834] [2021-11-07 01:50:10,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:50:10,233 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:50:10,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:50:10,235 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:50:10,240 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-07 01:50:10,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:50:10,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-07 01:50:10,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:50:10,533 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-07 01:50:10,533 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:50:11,336 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 01:50:11,337 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:50:11,337 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1248224834] [2021-11-07 01:50:11,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1248224834] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:50:11,338 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1420373981] [2021-11-07 01:50:11,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:50:11,339 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:50:11,339 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:50:11,342 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:50:11,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (4)] Waiting until timeout for monitored process [2021-11-07 01:50:11,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:50:11,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-07 01:50:11,443 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:50:11,542 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-07 01:50:11,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:50:12,009 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 01:50:12,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1420373981] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:50:12,009 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1807470142] [2021-11-07 01:50:12,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:50:12,010 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:50:12,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:50:12,012 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:50:12,054 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-07 01:50:12,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:50:12,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-07 01:50:12,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:50:12,252 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-07 01:50:12,252 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:50:12,753 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 01:50:12,754 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1807470142] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:50:12,754 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 01:50:12,754 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9, 9] total 16 [2021-11-07 01:50:12,755 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284565510] [2021-11-07 01:50:12,756 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 01:50:12,756 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:50:12,757 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 01:50:12,758 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-11-07 01:50:12,758 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 16 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 12 states have internal predecessors, (22), 4 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-07 01:50:13,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:50:13,129 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2021-11-07 01:50:13,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-07 01:50:13,131 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 12 states have internal predecessors, (22), 4 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 17 [2021-11-07 01:50:13,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:50:13,132 INFO L225 Difference]: With dead ends: 28 [2021-11-07 01:50:13,132 INFO L226 Difference]: Without dead ends: 22 [2021-11-07 01:50:13,133 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=90, Invalid=416, Unknown=0, NotChecked=0, Total=506 [2021-11-07 01:50:13,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-07 01:50:13,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-11-07 01:50:13,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 16 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 4 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-07 01:50:13,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-11-07 01:50:13,144 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 17 [2021-11-07 01:50:13,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:50:13,144 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-11-07 01:50:13,145 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 12 states have internal predecessors, (22), 4 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-07 01:50:13,145 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-11-07 01:50:13,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-07 01:50:13,147 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:50:13,147 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:50:13,158 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Ended with exit code 0 [2021-11-07 01:50:13,359 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (4)] Ended with exit code 0 [2021-11-07 01:50:13,581 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-07 01:50:13,759 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:50:13,760 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:50:13,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:50:13,760 INFO L85 PathProgramCache]: Analyzing trace with hash -491101836, now seen corresponding path program 2 times [2021-11-07 01:50:13,761 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:50:13,761 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [109246631] [2021-11-07 01:50:13,762 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 01:50:13,762 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:50:13,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:50:13,764 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:50:13,774 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-07 01:50:13,877 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 01:50:13,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:50:13,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-07 01:50:13,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:50:14,201 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 01:50:14,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:50:16,199 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 01:50:16,200 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:50:16,200 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [109246631] [2021-11-07 01:50:16,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [109246631] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:50:16,200 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [806767686] [2021-11-07 01:50:16,201 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 01:50:16,201 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:50:16,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:50:16,206 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:50:16,229 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (7)] Waiting until timeout for monitored process [2021-11-07 01:50:16,421 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 01:50:16,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:50:16,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-07 01:50:16,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:50:16,585 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 01:50:16,586 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:50:17,776 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 01:50:17,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [806767686] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:50:17,777 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2028393199] [2021-11-07 01:50:17,779 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 01:50:17,779 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:50:17,779 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:50:17,787 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:50:17,793 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-07 01:50:17,983 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 01:50:17,984 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:50:17,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-07 01:50:17,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:50:18,146 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 01:50:18,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:50:19,374 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 01:50:19,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2028393199] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:50:19,374 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 01:50:19,375 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15, 13, 15, 13, 15] total 26 [2021-11-07 01:50:19,375 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889659757] [2021-11-07 01:50:19,376 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-07 01:50:19,376 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:50:19,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-07 01:50:19,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=569, Unknown=0, NotChecked=0, Total=650 [2021-11-07 01:50:19,377 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 26 states, 25 states have (on average 1.36) internal successors, (34), 18 states have internal predecessors, (34), 6 states have call successors, (6), 1 states have call predecessors, (6), 8 states have return successors, (8), 8 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-07 01:50:20,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:50:20,079 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-11-07 01:50:20,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-07 01:50:20,080 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.36) internal successors, (34), 18 states have internal predecessors, (34), 6 states have call successors, (6), 1 states have call predecessors, (6), 8 states have return successors, (8), 8 states have call predecessors, (8), 6 states have call successors, (8) Word has length 29 [2021-11-07 01:50:20,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:50:20,081 INFO L225 Difference]: With dead ends: 34 [2021-11-07 01:50:20,081 INFO L226 Difference]: Without dead ends: 28 [2021-11-07 01:50:20,082 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 142 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=182, Invalid=1150, Unknown=0, NotChecked=0, Total=1332 [2021-11-07 01:50:20,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-07 01:50:20,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-07 01:50:20,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 19 states have (on average 1.0526315789473684) internal successors, (20), 20 states have internal predecessors, (20), 2 states have call successors, (2), 1 states have call predecessors, (2), 6 states have return successors, (7), 6 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-07 01:50:20,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2021-11-07 01:50:20,088 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 29 [2021-11-07 01:50:20,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:50:20,089 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2021-11-07 01:50:20,089 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 1.36) internal successors, (34), 18 states have internal predecessors, (34), 6 states have call successors, (6), 1 states have call predecessors, (6), 8 states have return successors, (8), 8 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-07 01:50:20,089 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2021-11-07 01:50:20,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-07 01:50:20,091 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:50:20,091 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:50:20,098 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (7)] Forceful destruction successful, exit code 0 [2021-11-07 01:50:20,311 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-07 01:50:20,498 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Ended with exit code 0 [2021-11-07 01:50:20,692 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:50:20,693 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:50:20,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:50:20,693 INFO L85 PathProgramCache]: Analyzing trace with hash -492655308, now seen corresponding path program 3 times [2021-11-07 01:50:20,694 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:50:20,694 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1541487203] [2021-11-07 01:50:20,694 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:50:20,694 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:50:20,694 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:50:20,695 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:50:20,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-07 01:50:20,896 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-07 01:50:20,896 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:50:20,898 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-07 01:50:20,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:50:21,327 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-07 01:50:21,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:50:24,553 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 01:50:24,553 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:50:24,553 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1541487203] [2021-11-07 01:50:24,553 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1541487203] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:50:24,554 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [449101251] [2021-11-07 01:50:24,554 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:50:24,554 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:50:24,554 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:50:24,562 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:50:24,563 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-11-07 01:50:24,878 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-07 01:50:24,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:50:24,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-07 01:50:24,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:50:25,063 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-07 01:50:25,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:50:26,961 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 01:50:26,962 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [449101251] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:50:26,962 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1370899333] [2021-11-07 01:50:26,962 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:50:26,962 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:50:26,962 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:50:26,970 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:50:26,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-07 01:50:27,292 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-07 01:50:27,292 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:50:27,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-07 01:50:27,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:50:27,508 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-07 01:50:27,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:50:29,452 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 01:50:29,452 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1370899333] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:50:29,452 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 01:50:29,452 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 21, 17, 21, 17, 21] total 36 [2021-11-07 01:50:29,453 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577844362] [2021-11-07 01:50:29,454 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-07 01:50:29,454 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:50:29,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-07 01:50:29,455 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1141, Unknown=0, NotChecked=0, Total=1260 [2021-11-07 01:50:29,455 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand has 36 states, 35 states have (on average 1.3142857142857143) internal successors, (46), 24 states have internal predecessors, (46), 8 states have call successors, (8), 1 states have call predecessors, (8), 12 states have return successors, (12), 12 states have call predecessors, (12), 8 states have call successors, (12) [2021-11-07 01:50:30,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:50:30,428 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2021-11-07 01:50:30,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-07 01:50:30,429 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 1.3142857142857143) internal successors, (46), 24 states have internal predecessors, (46), 8 states have call successors, (8), 1 states have call predecessors, (8), 12 states have return successors, (12), 12 states have call predecessors, (12), 8 states have call successors, (12) Word has length 41 [2021-11-07 01:50:30,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:50:30,431 INFO L225 Difference]: With dead ends: 40 [2021-11-07 01:50:30,431 INFO L226 Difference]: Without dead ends: 34 [2021-11-07 01:50:30,432 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 204 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 373 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=290, Invalid=2260, Unknown=0, NotChecked=0, Total=2550 [2021-11-07 01:50:30,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-07 01:50:30,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-11-07 01:50:30,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 23 states have (on average 1.0434782608695652) internal successors, (24), 24 states have internal predecessors, (24), 2 states have call successors, (2), 1 states have call predecessors, (2), 8 states have return successors, (9), 8 states have call predecessors, (9), 2 states have call successors, (9) [2021-11-07 01:50:30,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2021-11-07 01:50:30,439 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 41 [2021-11-07 01:50:30,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:50:30,439 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2021-11-07 01:50:30,439 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 1.3142857142857143) internal successors, (46), 24 states have internal predecessors, (46), 8 states have call successors, (8), 1 states have call predecessors, (8), 12 states have return successors, (12), 12 states have call predecessors, (12), 8 states have call successors, (12) [2021-11-07 01:50:30,440 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2021-11-07 01:50:30,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-07 01:50:30,442 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:50:30,442 INFO L513 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:50:30,485 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-07 01:50:30,677 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-07 01:50:30,872 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2021-11-07 01:50:31,070 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:50:31,071 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:50:31,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:50:31,071 INFO L85 PathProgramCache]: Analyzing trace with hash -1906255628, now seen corresponding path program 4 times [2021-11-07 01:50:31,072 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:50:31,072 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1443395993] [2021-11-07 01:50:31,072 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:50:31,072 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:50:31,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:50:31,078 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:50:31,090 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-07 01:50:31,386 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:50:31,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:50:31,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-07 01:50:31,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:50:31,863 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-07 01:50:31,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:50:36,643 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 01:50:36,643 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:50:36,644 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1443395993] [2021-11-07 01:50:36,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1443395993] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:50:36,644 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1754897867] [2021-11-07 01:50:36,644 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:50:36,644 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:50:36,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:50:36,650 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:50:36,670 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-11-07 01:50:37,202 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:50:37,203 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:50:37,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-07 01:50:37,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:50:37,474 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-07 01:50:37,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:50:40,071 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 01:50:40,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1754897867] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:50:40,072 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1269739580] [2021-11-07 01:50:40,072 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:50:40,073 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:50:40,073 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:50:40,074 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:50:40,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-07 01:50:40,569 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:50:40,569 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:50:40,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-07 01:50:40,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:50:40,807 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-07 01:50:40,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:50:43,503 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 01:50:43,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1269739580] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:50:43,504 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 01:50:43,504 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 27, 21, 27, 21, 27] total 46 [2021-11-07 01:50:43,504 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147547156] [2021-11-07 01:50:43,505 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-07 01:50:43,505 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:50:43,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-07 01:50:43,507 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=1913, Unknown=0, NotChecked=0, Total=2070 [2021-11-07 01:50:43,508 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand has 46 states, 45 states have (on average 1.288888888888889) internal successors, (58), 30 states have internal predecessors, (58), 10 states have call successors, (10), 1 states have call predecessors, (10), 16 states have return successors, (16), 16 states have call predecessors, (16), 10 states have call successors, (16) [2021-11-07 01:50:45,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:50:45,060 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2021-11-07 01:50:45,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-07 01:50:45,061 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 1.288888888888889) internal successors, (58), 30 states have internal predecessors, (58), 10 states have call successors, (10), 1 states have call predecessors, (10), 16 states have return successors, (16), 16 states have call predecessors, (16), 10 states have call successors, (16) Word has length 53 [2021-11-07 01:50:45,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:50:45,063 INFO L225 Difference]: With dead ends: 46 [2021-11-07 01:50:45,063 INFO L226 Difference]: Without dead ends: 40 [2021-11-07 01:50:45,066 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 266 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 596 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=414, Invalid=3746, Unknown=0, NotChecked=0, Total=4160 [2021-11-07 01:50:45,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-07 01:50:45,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-11-07 01:50:45,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 27 states have (on average 1.037037037037037) internal successors, (28), 28 states have internal predecessors, (28), 2 states have call successors, (2), 1 states have call predecessors, (2), 10 states have return successors, (11), 10 states have call predecessors, (11), 2 states have call successors, (11) [2021-11-07 01:50:45,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2021-11-07 01:50:45,073 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 53 [2021-11-07 01:50:45,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:50:45,073 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2021-11-07 01:50:45,074 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 1.288888888888889) internal successors, (58), 30 states have internal predecessors, (58), 10 states have call successors, (10), 1 states have call predecessors, (10), 16 states have return successors, (16), 16 states have call predecessors, (16), 10 states have call successors, (16) [2021-11-07 01:50:45,074 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2021-11-07 01:50:45,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-07 01:50:45,075 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:50:45,075 INFO L513 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:50:45,096 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-07 01:50:45,308 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-07 01:50:45,490 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (13)] Ended with exit code 0 [2021-11-07 01:50:45,688 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:50:45,688 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:50:45,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:50:45,688 INFO L85 PathProgramCache]: Analyzing trace with hash 788849844, now seen corresponding path program 5 times [2021-11-07 01:50:45,689 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:50:45,689 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [513846285] [2021-11-07 01:50:45,689 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-07 01:50:45,689 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:50:45,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:50:45,690 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:50:45,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-07 01:50:46,176 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-11-07 01:50:46,176 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:50:46,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-07 01:50:46,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:50:46,860 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-11-07 01:50:46,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:50:53,008 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 01:50:53,008 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:50:53,008 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [513846285] [2021-11-07 01:50:53,008 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [513846285] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:50:53,008 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [465237952] [2021-11-07 01:50:53,008 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-07 01:50:53,008 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:50:53,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:50:53,009 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:50:53,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-11-07 01:50:53,794 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-11-07 01:50:53,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:50:53,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-07 01:50:53,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:50:54,055 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-11-07 01:50:54,055 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:50:57,366 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 01:50:57,366 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [465237952] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:50:57,366 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2135329] [2021-11-07 01:50:57,366 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-07 01:50:57,367 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:50:57,367 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:50:57,367 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:50:57,369 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-07 01:50:58,129 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-11-07 01:50:58,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:50:58,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-07 01:50:58,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:50:58,397 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-11-07 01:50:58,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:51:01,681 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 01:51:01,681 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2135329] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:51:01,681 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 01:51:01,682 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 33, 25, 33, 25, 33] total 56 [2021-11-07 01:51:01,682 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1783139198] [2021-11-07 01:51:01,683 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-07 01:51:01,683 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:51:01,684 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-07 01:51:01,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=2885, Unknown=0, NotChecked=0, Total=3080 [2021-11-07 01:51:01,685 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand has 56 states, 55 states have (on average 1.2727272727272727) internal successors, (70), 36 states have internal predecessors, (70), 12 states have call successors, (12), 1 states have call predecessors, (12), 20 states have return successors, (20), 20 states have call predecessors, (20), 12 states have call successors, (20) [2021-11-07 01:51:03,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:51:03,715 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2021-11-07 01:51:03,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-07 01:51:03,716 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 55 states have (on average 1.2727272727272727) internal successors, (70), 36 states have internal predecessors, (70), 12 states have call successors, (12), 1 states have call predecessors, (12), 20 states have return successors, (20), 20 states have call predecessors, (20), 12 states have call successors, (20) Word has length 65 [2021-11-07 01:51:03,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:51:03,718 INFO L225 Difference]: With dead ends: 52 [2021-11-07 01:51:03,718 INFO L226 Difference]: Without dead ends: 46 [2021-11-07 01:51:03,720 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 407 GetRequests, 328 SyntacticMatches, 2 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 871 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=554, Invalid=5608, Unknown=0, NotChecked=0, Total=6162 [2021-11-07 01:51:03,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-07 01:51:03,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-11-07 01:51:03,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 31 states have (on average 1.032258064516129) internal successors, (32), 32 states have internal predecessors, (32), 2 states have call successors, (2), 1 states have call predecessors, (2), 12 states have return successors, (13), 12 states have call predecessors, (13), 2 states have call successors, (13) [2021-11-07 01:51:03,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2021-11-07 01:51:03,728 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 65 [2021-11-07 01:51:03,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:51:03,728 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2021-11-07 01:51:03,729 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 55 states have (on average 1.2727272727272727) internal successors, (70), 36 states have internal predecessors, (70), 12 states have call successors, (12), 1 states have call predecessors, (12), 20 states have return successors, (20), 20 states have call predecessors, (20), 12 states have call successors, (20) [2021-11-07 01:51:03,729 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2021-11-07 01:51:03,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-07 01:51:03,730 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:51:03,731 INFO L513 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:51:03,742 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (16)] Forceful destruction successful, exit code 0 [2021-11-07 01:51:03,956 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2021-11-07 01:51:04,143 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Ended with exit code 0 [2021-11-07 01:51:04,335 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:51:04,335 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:51:04,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:51:04,336 INFO L85 PathProgramCache]: Analyzing trace with hash 1302253684, now seen corresponding path program 6 times [2021-11-07 01:51:04,336 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:51:04,336 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [705199967] [2021-11-07 01:51:04,336 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-07 01:51:04,336 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:51:04,337 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:51:04,337 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:51:04,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-07 01:51:05,062 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2021-11-07 01:51:05,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:51:05,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-07 01:51:05,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:51:05,811 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-11-07 01:51:05,812 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:51:14,357 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-07 01:51:14,357 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:51:14,357 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [705199967] [2021-11-07 01:51:14,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [705199967] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:51:14,357 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [480582456] [2021-11-07 01:51:14,358 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-07 01:51:14,358 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:51:14,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:51:14,362 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:51:14,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-07 01:51:15,498 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2021-11-07 01:51:15,499 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:51:15,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-07 01:51:15,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:51:15,812 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-11-07 01:51:15,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:51:20,263 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-07 01:51:20,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [480582456] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:51:20,264 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [434735661] [2021-11-07 01:51:20,264 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-07 01:51:20,264 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:51:20,264 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:51:20,267 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:51:20,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-07 01:51:21,324 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2021-11-07 01:51:21,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:51:21,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-07 01:51:21,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:51:21,699 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 197 refuted. 0 times theorem prover too weak. 177 trivial. 0 not checked. [2021-11-07 01:51:21,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:51:26,425 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-07 01:51:26,425 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [434735661] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:51:26,426 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 01:51:26,426 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 39, 29, 39, 30, 39] total 67 [2021-11-07 01:51:26,426 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707629468] [2021-11-07 01:51:26,427 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-07 01:51:26,427 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:51:26,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-07 01:51:26,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=4174, Unknown=0, NotChecked=0, Total=4422 [2021-11-07 01:51:26,430 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand has 67 states, 65 states have (on average 1.2769230769230768) internal successors, (83), 43 states have internal predecessors, (83), 15 states have call successors, (15), 1 states have call predecessors, (15), 24 states have return successors, (25), 24 states have call predecessors, (25), 15 states have call successors, (25) [2021-11-07 01:51:29,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:51:29,103 INFO L93 Difference]: Finished difference Result 58 states and 60 transitions. [2021-11-07 01:51:29,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-07 01:51:29,104 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 65 states have (on average 1.2769230769230768) internal successors, (83), 43 states have internal predecessors, (83), 15 states have call successors, (15), 1 states have call predecessors, (15), 24 states have return successors, (25), 24 states have call predecessors, (25), 15 states have call successors, (25) Word has length 77 [2021-11-07 01:51:29,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:51:29,105 INFO L225 Difference]: With dead ends: 58 [2021-11-07 01:51:29,106 INFO L226 Difference]: Without dead ends: 52 [2021-11-07 01:51:29,109 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 483 GetRequests, 389 SyntacticMatches, 2 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1252 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=748, Invalid=7994, Unknown=0, NotChecked=0, Total=8742 [2021-11-07 01:51:29,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-07 01:51:29,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-11-07 01:51:29,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 35 states have (on average 1.0285714285714285) internal successors, (36), 36 states have internal predecessors, (36), 2 states have call successors, (2), 1 states have call predecessors, (2), 14 states have return successors, (15), 14 states have call predecessors, (15), 2 states have call successors, (15) [2021-11-07 01:51:29,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2021-11-07 01:51:29,116 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 77 [2021-11-07 01:51:29,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:51:29,117 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2021-11-07 01:51:29,117 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 65 states have (on average 1.2769230769230768) internal successors, (83), 43 states have internal predecessors, (83), 15 states have call successors, (15), 1 states have call predecessors, (15), 24 states have return successors, (25), 24 states have call predecessors, (25), 15 states have call successors, (25) [2021-11-07 01:51:29,117 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2021-11-07 01:51:29,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-07 01:51:29,119 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:51:29,120 INFO L513 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:51:29,133 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-07 01:51:29,372 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-07 01:51:29,545 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-07 01:51:29,733 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:51:29,733 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:51:29,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:51:29,734 INFO L85 PathProgramCache]: Analyzing trace with hash -1287742412, now seen corresponding path program 7 times [2021-11-07 01:51:29,734 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:51:29,734 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1914500508] [2021-11-07 01:51:29,734 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 01:51:29,734 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:51:29,734 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:51:29,735 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:51:29,737 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-07 01:51:30,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:51:30,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-07 01:51:30,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:51:31,669 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2021-11-07 01:51:31,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:51:43,352 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-07 01:51:43,352 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:51:43,352 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1914500508] [2021-11-07 01:51:43,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1914500508] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:51:43,353 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1869246142] [2021-11-07 01:51:43,353 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 01:51:43,353 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:51:43,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:51:43,354 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:51:43,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-07 01:51:44,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:51:44,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-07 01:51:44,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:51:45,202 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2021-11-07 01:51:45,202 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:51:51,037 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-07 01:51:51,037 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1869246142] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:51:51,038 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1020180938] [2021-11-07 01:51:51,038 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 01:51:51,038 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:51:51,038 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:51:51,039 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:51:51,039 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-07 01:51:52,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:51:52,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-07 01:51:52,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:51:52,776 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2021-11-07 01:51:52,776 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:51:58,384 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-07 01:51:58,384 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1020180938] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:51:58,384 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 01:51:58,384 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 45, 33, 45, 33, 45] total 76 [2021-11-07 01:51:58,385 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072918593] [2021-11-07 01:51:58,386 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2021-11-07 01:51:58,386 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:51:58,387 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-11-07 01:51:58,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=5429, Unknown=0, NotChecked=0, Total=5700 [2021-11-07 01:51:58,389 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand has 76 states, 75 states have (on average 1.2533333333333334) internal successors, (94), 48 states have internal predecessors, (94), 16 states have call successors, (16), 1 states have call predecessors, (16), 28 states have return successors, (28), 28 states have call predecessors, (28), 16 states have call successors, (28) [2021-11-07 01:52:01,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:52:01,656 INFO L93 Difference]: Finished difference Result 64 states and 66 transitions. [2021-11-07 01:52:01,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-07 01:52:01,669 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 75 states have (on average 1.2533333333333334) internal successors, (94), 48 states have internal predecessors, (94), 16 states have call successors, (16), 1 states have call predecessors, (16), 28 states have return successors, (28), 28 states have call predecessors, (28), 16 states have call successors, (28) Word has length 89 [2021-11-07 01:52:01,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:52:01,671 INFO L225 Difference]: With dead ends: 64 [2021-11-07 01:52:01,671 INFO L226 Difference]: Without dead ends: 58 [2021-11-07 01:52:01,675 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 559 GetRequests, 452 SyntacticMatches, 2 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1577 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=882, Invalid=10460, Unknown=0, NotChecked=0, Total=11342 [2021-11-07 01:52:01,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-11-07 01:52:01,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2021-11-07 01:52:01,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 39 states have (on average 1.0256410256410255) internal successors, (40), 40 states have internal predecessors, (40), 2 states have call successors, (2), 1 states have call predecessors, (2), 16 states have return successors, (17), 16 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-07 01:52:01,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2021-11-07 01:52:01,683 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 89 [2021-11-07 01:52:01,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:52:01,683 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2021-11-07 01:52:01,684 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 75 states have (on average 1.2533333333333334) internal successors, (94), 48 states have internal predecessors, (94), 16 states have call successors, (16), 1 states have call predecessors, (16), 28 states have return successors, (28), 28 states have call predecessors, (28), 16 states have call successors, (28) [2021-11-07 01:52:01,684 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2021-11-07 01:52:01,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-07 01:52:01,686 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:52:01,686 INFO L513 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:52:01,706 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-07 01:52:01,917 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-07 01:52:02,102 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-07 01:52:02,293 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:52:02,294 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:52:02,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:52:02,294 INFO L85 PathProgramCache]: Analyzing trace with hash 1760839668, now seen corresponding path program 8 times [2021-11-07 01:52:02,294 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:52:02,294 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [651714587] [2021-11-07 01:52:02,295 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 01:52:02,295 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:52:02,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:52:02,296 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:52:02,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-07 01:52:03,580 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 01:52:03,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:52:03,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 68 conjunts are in the unsatisfiable core [2021-11-07 01:52:03,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:52:04,690 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-11-07 01:52:04,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:52:18,982 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-07 01:52:18,982 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:52:18,982 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [651714587] [2021-11-07 01:52:18,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [651714587] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:52:18,982 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [597111569] [2021-11-07 01:52:18,982 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 01:52:18,982 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:52:18,982 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:52:18,983 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:52:18,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-11-07 01:52:20,946 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 01:52:20,946 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:52:20,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 68 conjunts are in the unsatisfiable core [2021-11-07 01:52:20,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:52:21,367 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-11-07 01:52:21,367 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:52:28,453 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-07 01:52:28,453 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [597111569] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:52:28,453 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1796218165] [2021-11-07 01:52:28,453 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 01:52:28,453 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:52:28,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:52:28,454 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:52:28,455 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-07 01:52:30,247 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 01:52:30,248 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:52:30,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 68 conjunts are in the unsatisfiable core [2021-11-07 01:52:30,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:52:30,664 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-11-07 01:52:30,664 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:52:37,515 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-07 01:52:37,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1796218165] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:52:37,515 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 01:52:37,515 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 51, 37, 51, 37, 51] total 86 [2021-11-07 01:52:37,515 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137216008] [2021-11-07 01:52:37,516 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2021-11-07 01:52:37,516 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:52:37,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-11-07 01:52:37,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=7001, Unknown=0, NotChecked=0, Total=7310 [2021-11-07 01:52:37,519 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand has 86 states, 85 states have (on average 1.2470588235294118) internal successors, (106), 54 states have internal predecessors, (106), 18 states have call successors, (18), 1 states have call predecessors, (18), 32 states have return successors, (32), 32 states have call predecessors, (32), 18 states have call successors, (32) [2021-11-07 01:52:41,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:52:41,818 INFO L93 Difference]: Finished difference Result 70 states and 72 transitions. [2021-11-07 01:52:41,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-07 01:52:41,819 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 85 states have (on average 1.2470588235294118) internal successors, (106), 54 states have internal predecessors, (106), 18 states have call successors, (18), 1 states have call predecessors, (18), 32 states have return successors, (32), 32 states have call predecessors, (32), 18 states have call successors, (32) Word has length 101 [2021-11-07 01:52:41,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:52:41,821 INFO L225 Difference]: With dead ends: 70 [2021-11-07 01:52:41,821 INFO L226 Difference]: Without dead ends: 64 [2021-11-07 01:52:41,824 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 635 GetRequests, 514 SyntacticMatches, 2 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2008 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=1070, Invalid=13450, Unknown=0, NotChecked=0, Total=14520 [2021-11-07 01:52:41,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-07 01:52:41,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-11-07 01:52:41,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 43 states have (on average 1.0232558139534884) internal successors, (44), 44 states have internal predecessors, (44), 2 states have call successors, (2), 1 states have call predecessors, (2), 18 states have return successors, (19), 18 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-07 01:52:41,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2021-11-07 01:52:41,831 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 101 [2021-11-07 01:52:41,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:52:41,831 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2021-11-07 01:52:41,832 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 85 states have (on average 1.2470588235294118) internal successors, (106), 54 states have internal predecessors, (106), 18 states have call successors, (18), 1 states have call predecessors, (18), 32 states have return successors, (32), 32 states have call predecessors, (32), 18 states have call successors, (32) [2021-11-07 01:52:41,832 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2021-11-07 01:52:41,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-07 01:52:41,834 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:52:41,834 INFO L513 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:52:41,866 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-07 01:52:42,056 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2021-11-07 01:52:42,261 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-07 01:52:42,450 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:52:42,451 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:52:42,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:52:42,451 INFO L85 PathProgramCache]: Analyzing trace with hash -1211116620, now seen corresponding path program 9 times [2021-11-07 01:52:42,451 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:52:42,452 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1245739439] [2021-11-07 01:52:42,452 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:52:42,452 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:52:42,452 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:52:42,453 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:52:42,460 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-07 01:52:44,129 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-11-07 01:52:44,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:52:44,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 76 conjunts are in the unsatisfiable core [2021-11-07 01:52:44,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:52:45,382 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2021-11-07 01:52:45,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:53:02,475 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 731 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-11-07 01:53:02,475 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:53:02,475 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1245739439] [2021-11-07 01:53:02,475 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1245739439] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:53:02,475 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [451876235] [2021-11-07 01:53:02,476 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:53:02,476 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:53:02,476 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:53:02,476 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:53:02,478 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-07 01:53:05,029 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-11-07 01:53:05,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:53:05,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 76 conjunts are in the unsatisfiable core [2021-11-07 01:53:05,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:53:05,489 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2021-11-07 01:53:05,489 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:53:13,821 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 731 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-11-07 01:53:13,821 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [451876235] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:53:13,821 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1100665830] [2021-11-07 01:53:13,821 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:53:13,822 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:53:13,822 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:53:13,822 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:53:13,823 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-07 01:53:16,146 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-11-07 01:53:16,147 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:53:16,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 78 conjunts are in the unsatisfiable core [2021-11-07 01:53:16,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:53:16,733 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 472 refuted. 0 times theorem prover too weak. 412 trivial. 0 not checked. [2021-11-07 01:53:16,733 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:53:24,892 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 731 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-11-07 01:53:24,892 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1100665830] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:53:24,893 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 01:53:24,893 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 57, 41, 57, 42, 57] total 97 [2021-11-07 01:53:24,893 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1141766385] [2021-11-07 01:53:24,894 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2021-11-07 01:53:24,894 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:53:24,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-11-07 01:53:24,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=368, Invalid=8944, Unknown=0, NotChecked=0, Total=9312 [2021-11-07 01:53:24,897 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand has 97 states, 95 states have (on average 1.2526315789473683) internal successors, (119), 61 states have internal predecessors, (119), 21 states have call successors, (21), 1 states have call predecessors, (21), 36 states have return successors, (38), 36 states have call predecessors, (38), 21 states have call successors, (38) [2021-11-07 01:53:29,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:53:29,807 INFO L93 Difference]: Finished difference Result 76 states and 78 transitions. [2021-11-07 01:53:29,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-07 01:53:29,808 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 95 states have (on average 1.2526315789473683) internal successors, (119), 61 states have internal predecessors, (119), 21 states have call successors, (21), 1 states have call predecessors, (21), 36 states have return successors, (38), 36 states have call predecessors, (38), 21 states have call successors, (38) Word has length 113 [2021-11-07 01:53:29,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:53:29,809 INFO L225 Difference]: With dead ends: 76 [2021-11-07 01:53:29,809 INFO L226 Difference]: Without dead ends: 70 [2021-11-07 01:53:29,812 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 711 GetRequests, 575 SyntacticMatches, 2 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2569 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=1330, Invalid=17030, Unknown=0, NotChecked=0, Total=18360 [2021-11-07 01:53:29,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-07 01:53:29,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2021-11-07 01:53:29,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 47 states have (on average 1.0212765957446808) internal successors, (48), 48 states have internal predecessors, (48), 2 states have call successors, (2), 1 states have call predecessors, (2), 20 states have return successors, (21), 20 states have call predecessors, (21), 2 states have call successors, (21) [2021-11-07 01:53:29,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 71 transitions. [2021-11-07 01:53:29,819 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 71 transitions. Word has length 113 [2021-11-07 01:53:29,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:53:29,820 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 71 transitions. [2021-11-07 01:53:29,820 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 95 states have (on average 1.2526315789473683) internal successors, (119), 61 states have internal predecessors, (119), 21 states have call successors, (21), 1 states have call predecessors, (21), 36 states have return successors, (38), 36 states have call predecessors, (38), 21 states have call successors, (38) [2021-11-07 01:53:29,820 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 71 transitions. [2021-11-07 01:53:29,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-07 01:53:29,822 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:53:29,822 INFO L513 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:53:29,831 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-11-07 01:53:30,054 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-07 01:53:30,238 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-07 01:53:30,426 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:53:30,427 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:53:30,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:53:30,427 INFO L85 PathProgramCache]: Analyzing trace with hash 685850484, now seen corresponding path program 10 times [2021-11-07 01:53:30,428 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:53:30,428 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [83880003] [2021-11-07 01:53:30,428 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:53:30,428 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:53:30,428 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:53:30,429 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:53:30,430 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-07 01:53:32,456 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:53:32,456 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:53:32,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 84 conjunts are in the unsatisfiable core [2021-11-07 01:53:32,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:53:33,940 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2021-11-07 01:53:33,940 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:53:55,126 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 912 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-11-07 01:53:55,126 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:53:55,127 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [83880003] [2021-11-07 01:53:55,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [83880003] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:53:55,127 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2074913037] [2021-11-07 01:53:55,127 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:53:55,127 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:53:55,127 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:53:55,128 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:53:55,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (31)] Waiting until timeout for monitored process [2021-11-07 01:53:58,255 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:53:58,255 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:53:58,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 84 conjunts are in the unsatisfiable core [2021-11-07 01:53:58,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:53:58,789 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2021-11-07 01:53:58,789 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:54:08,978 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 912 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-11-07 01:54:08,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2074913037] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:54:08,979 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [419541133] [2021-11-07 01:54:08,979 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:54:08,979 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:54:08,979 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:54:08,980 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:54:08,981 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-07 01:54:11,769 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:54:11,769 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:54:11,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 84 conjunts are in the unsatisfiable core [2021-11-07 01:54:11,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:54:12,282 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2021-11-07 01:54:12,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:54:22,546 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 912 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-11-07 01:54:22,547 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [419541133] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:54:22,547 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 01:54:22,547 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 63, 45, 63, 45, 63] total 106 [2021-11-07 01:54:22,547 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749684234] [2021-11-07 01:54:22,548 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2021-11-07 01:54:22,548 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:54:22,549 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2021-11-07 01:54:22,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=385, Invalid=10745, Unknown=0, NotChecked=0, Total=11130 [2021-11-07 01:54:22,550 INFO L87 Difference]: Start difference. First operand 70 states and 71 transitions. Second operand has 106 states, 105 states have (on average 1.2380952380952381) internal successors, (130), 66 states have internal predecessors, (130), 22 states have call successors, (22), 1 states have call predecessors, (22), 40 states have return successors, (40), 40 states have call predecessors, (40), 22 states have call successors, (40) [2021-11-07 01:54:28,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:54:28,325 INFO L93 Difference]: Finished difference Result 82 states and 84 transitions. [2021-11-07 01:54:28,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-07 01:54:28,326 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 105 states have (on average 1.2380952380952381) internal successors, (130), 66 states have internal predecessors, (130), 22 states have call successors, (22), 1 states have call predecessors, (22), 40 states have return successors, (40), 40 states have call predecessors, (40), 22 states have call successors, (40) Word has length 125 [2021-11-07 01:54:28,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:54:28,327 INFO L225 Difference]: With dead ends: 82 [2021-11-07 01:54:28,327 INFO L226 Difference]: Without dead ends: 76 [2021-11-07 01:54:28,330 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 787 GetRequests, 638 SyntacticMatches, 2 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3026 ImplicationChecksByTransitivity, 15.7s TimeCoverageRelationStatistics Valid=1494, Invalid=20558, Unknown=0, NotChecked=0, Total=22052 [2021-11-07 01:54:28,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-11-07 01:54:28,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2021-11-07 01:54:28,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 51 states have (on average 1.0196078431372548) internal successors, (52), 52 states have internal predecessors, (52), 2 states have call successors, (2), 1 states have call predecessors, (2), 22 states have return successors, (23), 22 states have call predecessors, (23), 2 states have call successors, (23) [2021-11-07 01:54:28,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 77 transitions. [2021-11-07 01:54:28,337 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 77 transitions. Word has length 125 [2021-11-07 01:54:28,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:54:28,337 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 77 transitions. [2021-11-07 01:54:28,338 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 105 states have (on average 1.2380952380952381) internal successors, (130), 66 states have internal predecessors, (130), 22 states have call successors, (22), 1 states have call predecessors, (22), 40 states have return successors, (40), 40 states have call predecessors, (40), 22 states have call successors, (40) [2021-11-07 01:54:28,338 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 77 transitions. [2021-11-07 01:54:28,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-07 01:54:28,340 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:54:28,340 INFO L513 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:54:28,379 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-07 01:54:28,581 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (30)] Forceful destruction successful, exit code 0 [2021-11-07 01:54:28,777 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (31)] Ended with exit code 0 [2021-11-07 01:54:28,966 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:54:28,967 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:54:28,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:54:28,967 INFO L85 PathProgramCache]: Analyzing trace with hash -2059891916, now seen corresponding path program 11 times [2021-11-07 01:54:28,967 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:54:28,967 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1430455706] [2021-11-07 01:54:28,968 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-07 01:54:28,968 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:54:28,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:54:28,969 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:54:28,970 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-07 01:54:31,615 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 22 check-sat command(s) [2021-11-07 01:54:31,616 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:54:31,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 92 conjunts are in the unsatisfiable core [2021-11-07 01:54:31,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:54:33,313 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2021-11-07 01:54:33,313 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:54:58,085 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 1113 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2021-11-07 01:54:58,085 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:54:58,085 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1430455706] [2021-11-07 01:54:58,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1430455706] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:54:58,086 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [639842970] [2021-11-07 01:54:58,086 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-07 01:54:58,086 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:54:58,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:54:58,087 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:54:58,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-07 01:55:01,921 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 22 check-sat command(s) [2021-11-07 01:55:01,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:55:01,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 92 conjunts are in the unsatisfiable core [2021-11-07 01:55:01,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:55:02,495 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2021-11-07 01:55:02,495 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:55:14,146 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 1113 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2021-11-07 01:55:14,146 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [639842970] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:55:14,146 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2026169969] [2021-11-07 01:55:14,146 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-07 01:55:14,146 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:55:14,146 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:55:14,147 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:55:14,148 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-07 01:55:17,645 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 22 check-sat command(s) [2021-11-07 01:55:17,645 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:55:17,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 92 conjunts are in the unsatisfiable core [2021-11-07 01:55:17,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:55:18,218 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2021-11-07 01:55:18,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:55:29,701 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 1113 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2021-11-07 01:55:29,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2026169969] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:55:29,701 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 01:55:29,701 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 69, 49, 69, 49, 69] total 116 [2021-11-07 01:55:29,701 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1393497855] [2021-11-07 01:55:29,702 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 116 states [2021-11-07 01:55:29,703 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:55:29,703 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2021-11-07 01:55:29,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=423, Invalid=12917, Unknown=0, NotChecked=0, Total=13340 [2021-11-07 01:55:29,704 INFO L87 Difference]: Start difference. First operand 76 states and 77 transitions. Second operand has 116 states, 115 states have (on average 1.2347826086956522) internal successors, (142), 72 states have internal predecessors, (142), 24 states have call successors, (24), 1 states have call predecessors, (24), 44 states have return successors, (44), 44 states have call predecessors, (44), 24 states have call successors, (44) [2021-11-07 01:55:36,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:55:36,519 INFO L93 Difference]: Finished difference Result 88 states and 90 transitions. [2021-11-07 01:55:36,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-07 01:55:36,520 INFO L78 Accepts]: Start accepts. Automaton has has 116 states, 115 states have (on average 1.2347826086956522) internal successors, (142), 72 states have internal predecessors, (142), 24 states have call successors, (24), 1 states have call predecessors, (24), 44 states have return successors, (44), 44 states have call predecessors, (44), 24 states have call successors, (44) Word has length 137 [2021-11-07 01:55:36,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:55:36,521 INFO L225 Difference]: With dead ends: 88 [2021-11-07 01:55:36,521 INFO L226 Difference]: Without dead ends: 82 [2021-11-07 01:55:36,522 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 863 GetRequests, 700 SyntacticMatches, 2 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3613 ImplicationChecksByTransitivity, 18.6s TimeCoverageRelationStatistics Valid=1730, Invalid=24676, Unknown=0, NotChecked=0, Total=26406 [2021-11-07 01:55:36,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-07 01:55:36,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2021-11-07 01:55:36,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 55 states have (on average 1.018181818181818) internal successors, (56), 56 states have internal predecessors, (56), 2 states have call successors, (2), 1 states have call predecessors, (2), 24 states have return successors, (25), 24 states have call predecessors, (25), 2 states have call successors, (25) [2021-11-07 01:55:36,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2021-11-07 01:55:36,529 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 137 [2021-11-07 01:55:36,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:55:36,530 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2021-11-07 01:55:36,530 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 116 states, 115 states have (on average 1.2347826086956522) internal successors, (142), 72 states have internal predecessors, (142), 24 states have call successors, (24), 1 states have call predecessors, (24), 44 states have return successors, (44), 44 states have call predecessors, (44), 24 states have call successors, (44) [2021-11-07 01:55:36,531 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2021-11-07 01:55:36,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-07 01:55:36,532 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:55:36,533 INFO L513 BasicCegarLoop]: trace histogram [24, 24, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:55:36,553 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-11-07 01:55:36,765 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Ended with exit code 0 [2021-11-07 01:55:36,985 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-07 01:55:37,151 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:55:37,152 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:55:37,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:55:37,152 INFO L85 PathProgramCache]: Analyzing trace with hash -706365708, now seen corresponding path program 12 times [2021-11-07 01:55:37,152 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:55:37,152 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1778793793] [2021-11-07 01:55:37,152 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-07 01:55:37,153 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:55:37,153 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:55:37,153 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:55:37,154 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-07 01:55:40,314 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 24 check-sat command(s) [2021-11-07 01:55:40,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:55:40,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 100 conjunts are in the unsatisfiable core [2021-11-07 01:55:40,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:55:42,295 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2021-11-07 01:55:42,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:56:11,644 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 1334 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2021-11-07 01:56:11,644 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:56:11,644 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1778793793] [2021-11-07 01:56:11,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1778793793] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:56:11,644 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [101461696] [2021-11-07 01:56:11,645 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-07 01:56:11,645 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:56:11,645 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:56:11,645 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:56:11,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (37)] Waiting until timeout for monitored process [2021-11-07 01:56:16,307 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 24 check-sat command(s) [2021-11-07 01:56:16,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:56:16,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 100 conjunts are in the unsatisfiable core [2021-11-07 01:56:16,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:56:16,954 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2021-11-07 01:56:16,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:56:30,538 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 1334 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2021-11-07 01:56:30,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [101461696] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:56:30,538 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1530240397] [2021-11-07 01:56:30,539 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-07 01:56:30,539 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:56:30,539 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:56:30,550 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:56:30,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-07 01:56:34,743 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 24 check-sat command(s) [2021-11-07 01:56:34,743 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:56:34,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 100 conjunts are in the unsatisfiable core [2021-11-07 01:56:34,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:56:35,370 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2021-11-07 01:56:35,370 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:56:49,013 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 1334 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2021-11-07 01:56:49,013 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1530240397] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:56:49,013 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 01:56:49,013 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 75, 53, 75, 53, 75] total 126 [2021-11-07 01:56:49,014 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778396174] [2021-11-07 01:56:49,014 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 126 states [2021-11-07 01:56:49,015 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:56:49,015 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 126 interpolants. [2021-11-07 01:56:49,016 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=461, Invalid=15289, Unknown=0, NotChecked=0, Total=15750 [2021-11-07 01:56:49,017 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand has 126 states, 125 states have (on average 1.232) internal successors, (154), 78 states have internal predecessors, (154), 26 states have call successors, (26), 1 states have call predecessors, (26), 48 states have return successors, (48), 48 states have call predecessors, (48), 26 states have call successors, (48) [2021-11-07 01:56:56,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:56:56,944 INFO L93 Difference]: Finished difference Result 94 states and 96 transitions. [2021-11-07 01:56:56,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-11-07 01:56:56,945 INFO L78 Accepts]: Start accepts. Automaton has has 126 states, 125 states have (on average 1.232) internal successors, (154), 78 states have internal predecessors, (154), 26 states have call successors, (26), 1 states have call predecessors, (26), 48 states have return successors, (48), 48 states have call predecessors, (48), 26 states have call successors, (48) Word has length 149 [2021-11-07 01:56:56,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:56:56,946 INFO L225 Difference]: With dead ends: 94 [2021-11-07 01:56:56,946 INFO L226 Difference]: Without dead ends: 88 [2021-11-07 01:56:56,947 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 939 GetRequests, 762 SyntacticMatches, 2 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4252 ImplicationChecksByTransitivity, 21.9s TimeCoverageRelationStatistics Valid=1982, Invalid=29170, Unknown=0, NotChecked=0, Total=31152 [2021-11-07 01:56:56,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-07 01:56:56,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2021-11-07 01:56:56,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 59 states have (on average 1.0169491525423728) internal successors, (60), 60 states have internal predecessors, (60), 2 states have call successors, (2), 1 states have call predecessors, (2), 26 states have return successors, (27), 26 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-07 01:56:56,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2021-11-07 01:56:56,954 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 149 [2021-11-07 01:56:56,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:56:56,955 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2021-11-07 01:56:56,955 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 126 states, 125 states have (on average 1.232) internal successors, (154), 78 states have internal predecessors, (154), 26 states have call successors, (26), 1 states have call predecessors, (26), 48 states have return successors, (48), 48 states have call predecessors, (48), 26 states have call successors, (48) [2021-11-07 01:56:56,955 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2021-11-07 01:56:56,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-11-07 01:56:56,957 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:56:56,957 INFO L513 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:56:56,995 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-07 01:56:57,199 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (37)] Forceful destruction successful, exit code 0 [2021-11-07 01:56:57,414 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-07 01:56:57,580 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:56:57,580 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:56:57,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:56:57,580 INFO L85 PathProgramCache]: Analyzing trace with hash 1677247156, now seen corresponding path program 13 times [2021-11-07 01:56:57,581 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:56:57,581 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1789673087] [2021-11-07 01:56:57,581 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 01:56:57,581 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:56:57,581 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:56:57,583 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:56:57,622 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-07 01:57:01,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:57:01,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 108 conjunts are in the unsatisfiable core [2021-11-07 01:57:01,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:57:03,404 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2021-11-07 01:57:03,404 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:57:37,635 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 1575 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2021-11-07 01:57:37,636 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:57:37,636 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1789673087] [2021-11-07 01:57:37,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1789673087] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:57:37,636 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2013276311] [2021-11-07 01:57:37,636 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 01:57:37,636 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:57:37,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:57:37,637 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:57:37,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-11-07 01:57:43,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:57:43,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 108 conjunts are in the unsatisfiable core [2021-11-07 01:57:43,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:57:43,764 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2021-11-07 01:57:43,764 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:57:59,379 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 1575 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2021-11-07 01:57:59,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2013276311] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:57:59,379 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1317205419] [2021-11-07 01:57:59,380 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 01:57:59,380 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:57:59,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:57:59,386 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:57:59,387 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-07 01:58:04,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:58:04,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 108 conjunts are in the unsatisfiable core [2021-11-07 01:58:04,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:58:04,947 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2021-11-07 01:58:04,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:58:20,618 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 1575 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2021-11-07 01:58:20,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1317205419] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:58:20,619 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 01:58:20,619 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 81, 57, 81, 57, 81] total 136 [2021-11-07 01:58:20,620 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1124727273] [2021-11-07 01:58:20,621 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 136 states [2021-11-07 01:58:20,621 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:58:20,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2021-11-07 01:58:20,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=499, Invalid=17861, Unknown=0, NotChecked=0, Total=18360 [2021-11-07 01:58:20,624 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand has 136 states, 135 states have (on average 1.2296296296296296) internal successors, (166), 84 states have internal predecessors, (166), 28 states have call successors, (28), 1 states have call predecessors, (28), 52 states have return successors, (52), 52 states have call predecessors, (52), 28 states have call successors, (52) [2021-11-07 01:58:29,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:58:29,643 INFO L93 Difference]: Finished difference Result 100 states and 102 transitions. [2021-11-07 01:58:29,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-11-07 01:58:29,644 INFO L78 Accepts]: Start accepts. Automaton has has 136 states, 135 states have (on average 1.2296296296296296) internal successors, (166), 84 states have internal predecessors, (166), 28 states have call successors, (28), 1 states have call predecessors, (28), 52 states have return successors, (52), 52 states have call predecessors, (52), 28 states have call successors, (52) Word has length 161 [2021-11-07 01:58:29,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:58:29,659 INFO L225 Difference]: With dead ends: 100 [2021-11-07 01:58:29,660 INFO L226 Difference]: Without dead ends: 94 [2021-11-07 01:58:29,662 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1015 GetRequests, 824 SyntacticMatches, 2 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4943 ImplicationChecksByTransitivity, 25.6s TimeCoverageRelationStatistics Valid=2250, Invalid=34040, Unknown=0, NotChecked=0, Total=36290 [2021-11-07 01:58:29,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-07 01:58:29,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2021-11-07 01:58:29,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 63 states have (on average 1.0158730158730158) internal successors, (64), 64 states have internal predecessors, (64), 2 states have call successors, (2), 1 states have call predecessors, (2), 28 states have return successors, (29), 28 states have call predecessors, (29), 2 states have call successors, (29) [2021-11-07 01:58:29,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2021-11-07 01:58:29,669 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 161 [2021-11-07 01:58:29,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:58:29,670 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2021-11-07 01:58:29,671 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 136 states, 135 states have (on average 1.2296296296296296) internal successors, (166), 84 states have internal predecessors, (166), 28 states have call successors, (28), 1 states have call predecessors, (28), 52 states have return successors, (52), 52 states have call predecessors, (52), 28 states have call successors, (52) [2021-11-07 01:58:29,671 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2021-11-07 01:58:29,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-11-07 01:58:29,673 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:58:29,673 INFO L513 BasicCegarLoop]: trace histogram [28, 28, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:58:29,711 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (39)] Ended with exit code 0 [2021-11-07 01:58:29,910 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (40)] Ended with exit code 0 [2021-11-07 01:58:30,122 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-07 01:58:30,286 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:58:30,287 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:58:30,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:58:30,287 INFO L85 PathProgramCache]: Analyzing trace with hash -1199460748, now seen corresponding path program 14 times [2021-11-07 01:58:30,287 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:58:30,287 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1984295571] [2021-11-07 01:58:30,288 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 01:58:30,288 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:58:30,288 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:58:30,289 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:58:30,293 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-11-07 01:58:34,580 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 01:58:34,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:58:34,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 116 conjunts are in the unsatisfiable core [2021-11-07 01:58:34,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:58:37,017 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2021-11-07 01:58:37,018 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:59:15,727 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 0 proven. 1836 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2021-11-07 01:59:15,727 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:59:15,727 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1984295571] [2021-11-07 01:59:15,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1984295571] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:59:15,727 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [74007051] [2021-11-07 01:59:15,727 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 01:59:15,728 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:59:15,728 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:59:15,728 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:59:15,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (43)] Waiting until timeout for monitored process [2021-11-07 01:59:22,151 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 01:59:22,151 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:59:22,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 116 conjunts are in the unsatisfiable core [2021-11-07 01:59:22,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:59:22,888 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2021-11-07 01:59:22,888 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:59:40,860 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 0 proven. 1836 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2021-11-07 01:59:40,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [74007051] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:59:40,860 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1348571151] [2021-11-07 01:59:40,860 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 01:59:40,860 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:59:40,861 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:59:40,862 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:59:40,862 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-07 01:59:46,496 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 01:59:46,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:59:46,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 116 conjunts are in the unsatisfiable core [2021-11-07 01:59:46,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:59:47,245 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2021-11-07 01:59:47,245 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:00:07,057 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 0 proven. 1836 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2021-11-07 02:00:07,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1348571151] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:00:07,057 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 02:00:07,058 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 87, 61, 87, 61, 87] total 146 [2021-11-07 02:00:07,058 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284474379] [2021-11-07 02:00:07,059 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 146 states [2021-11-07 02:00:07,059 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:00:07,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2021-11-07 02:00:07,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=537, Invalid=20633, Unknown=0, NotChecked=0, Total=21170 [2021-11-07 02:00:07,060 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand has 146 states, 145 states have (on average 1.2275862068965517) internal successors, (178), 90 states have internal predecessors, (178), 30 states have call successors, (30), 1 states have call predecessors, (30), 56 states have return successors, (56), 56 states have call predecessors, (56), 30 states have call successors, (56) [2021-11-07 02:00:19,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:00:19,003 INFO L93 Difference]: Finished difference Result 106 states and 108 transitions. [2021-11-07 02:00:19,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-11-07 02:00:19,004 INFO L78 Accepts]: Start accepts. Automaton has has 146 states, 145 states have (on average 1.2275862068965517) internal successors, (178), 90 states have internal predecessors, (178), 30 states have call successors, (30), 1 states have call predecessors, (30), 56 states have return successors, (56), 56 states have call predecessors, (56), 30 states have call successors, (56) Word has length 173 [2021-11-07 02:00:19,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:00:19,006 INFO L225 Difference]: With dead ends: 106 [2021-11-07 02:00:19,006 INFO L226 Difference]: Without dead ends: 100 [2021-11-07 02:00:19,009 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1091 GetRequests, 886 SyntacticMatches, 2 SemanticMatches, 203 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5686 ImplicationChecksByTransitivity, 29.8s TimeCoverageRelationStatistics Valid=2534, Invalid=39286, Unknown=0, NotChecked=0, Total=41820 [2021-11-07 02:00:19,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-07 02:00:19,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2021-11-07 02:00:19,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 67 states have (on average 1.0149253731343284) internal successors, (68), 68 states have internal predecessors, (68), 2 states have call successors, (2), 1 states have call predecessors, (2), 30 states have return successors, (31), 30 states have call predecessors, (31), 2 states have call successors, (31) [2021-11-07 02:00:19,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2021-11-07 02:00:19,016 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 173 [2021-11-07 02:00:19,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:00:19,017 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2021-11-07 02:00:19,017 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 146 states, 145 states have (on average 1.2275862068965517) internal successors, (178), 90 states have internal predecessors, (178), 30 states have call successors, (30), 1 states have call predecessors, (30), 56 states have return successors, (56), 56 states have call predecessors, (56), 30 states have call successors, (56) [2021-11-07 02:00:19,018 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2021-11-07 02:00:19,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2021-11-07 02:00:19,019 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:00:19,019 INFO L513 BasicCegarLoop]: trace histogram [30, 30, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:00:19,072 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2021-11-07 02:00:19,253 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (42)] Ended with exit code 0 [2021-11-07 02:00:19,467 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (43)] Forceful destruction successful, exit code 0 [2021-11-07 02:00:19,630 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:00:19,631 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:00:19,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:00:19,631 INFO L85 PathProgramCache]: Analyzing trace with hash -1668253132, now seen corresponding path program 15 times [2021-11-07 02:00:19,632 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:00:19,632 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1331809081] [2021-11-07 02:00:19,632 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 02:00:19,632 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:00:19,632 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:00:19,633 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:00:19,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-07 02:00:24,983 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2021-11-07 02:00:24,983 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:00:24,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 124 conjunts are in the unsatisfiable core [2021-11-07 02:00:25,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:00:27,963 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2021-11-07 02:00:27,963 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:01:16,202 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 2117 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2021-11-07 02:01:16,203 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:01:16,203 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1331809081] [2021-11-07 02:01:16,203 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1331809081] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:01:16,203 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [364492183] [2021-11-07 02:01:16,203 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 02:01:16,203 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:01:16,203 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:01:16,204 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:01:16,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_575e95c2-55de-46c8-afe2-40b4a912cdaf/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (46)] Waiting until timeout for monitored process [2021-11-07 02:01:24,192 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2021-11-07 02:01:24,192 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:01:24,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 124 conjunts are in the unsatisfiable core [2021-11-07 02:01:24,201 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:01:25,082 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2021-11-07 02:01:25,082 INFO L328 TraceCheckSpWp]: Computing backward predicates...