./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/divbin_unwindbound20.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/divbin_unwindbound20.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF --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 7e073a4c36b82f2b6062e496bb836cd3d16667ec7228f4ab2b6689e74fa81265 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 22:51:44,085 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 22:51:44,087 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 22:51:44,146 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 22:51:44,147 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 22:51:44,153 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 22:51:44,156 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 22:51:44,161 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 22:51:44,164 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 22:51:44,173 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 22:51:44,175 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 22:51:44,177 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 22:51:44,178 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 22:51:44,181 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 22:51:44,185 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 22:51:44,193 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 22:51:44,197 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 22:51:44,198 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 22:51:44,202 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 22:51:44,204 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 22:51:44,207 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 22:51:44,209 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 22:51:44,211 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 22:51:44,212 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 22:51:44,217 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 22:51:44,217 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 22:51:44,218 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 22:51:44,219 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 22:51:44,220 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 22:51:44,221 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 22:51:44,222 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 22:51:44,223 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 22:51:44,224 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 22:51:44,225 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 22:51:44,227 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 22:51:44,228 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 22:51:44,230 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 22:51:44,231 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 22:51:44,231 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 22:51:44,232 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 22:51:44,233 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 22:51:44,234 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-12 22:51:44,291 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 22:51:44,292 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 22:51:44,294 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 22:51:44,294 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 22:51:44,295 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 22:51:44,295 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 22:51:44,295 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 22:51:44,295 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-12 22:51:44,296 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 22:51:44,296 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 22:51:44,297 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-12 22:51:44,298 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-12 22:51:44,298 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 22:51:44,299 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-12 22:51:44,299 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-12 22:51:44,299 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-12 22:51:44,300 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 22:51:44,301 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-12 22:51:44,301 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-12 22:51:44,301 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-12 22:51:44,302 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 22:51:44,302 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 22:51:44,302 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 22:51:44,303 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 22:51:44,303 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-12 22:51:44,303 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-12 22:51:44,304 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 22:51:44,304 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 22:51:44,304 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 22:51:44,306 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 22:51:44,307 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 22:51:44,307 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:51:44,308 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 22:51:44,308 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 22:51:44,308 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 22:51:44,308 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-12 22:51:44,309 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-12 22:51:44,309 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 22:51:44,309 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 22:51:44,310 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 22:51:44,310 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_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7e073a4c36b82f2b6062e496bb836cd3d16667ec7228f4ab2b6689e74fa81265 [2021-11-12 22:51:44,628 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 22:51:44,664 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 22:51:44,667 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 22:51:44,669 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 22:51:44,670 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 22:51:44,671 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/nla-digbench-scaling/divbin_unwindbound20.i [2021-11-12 22:51:44,746 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/data/cdbd9e030/b2fcf6367633496190579a0c71d3c28a/FLAG05431d5a8 [2021-11-12 22:51:45,302 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 22:51:45,303 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/sv-benchmarks/c/nla-digbench-scaling/divbin_unwindbound20.i [2021-11-12 22:51:45,317 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/data/cdbd9e030/b2fcf6367633496190579a0c71d3c28a/FLAG05431d5a8 [2021-11-12 22:51:45,655 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/data/cdbd9e030/b2fcf6367633496190579a0c71d3c28a [2021-11-12 22:51:45,657 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 22:51:45,659 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 22:51:45,665 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 22:51:45,665 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 22:51:45,669 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 22:51:45,670 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:51:45" (1/1) ... [2021-11-12 22:51:45,671 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1903b850 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:45, skipping insertion in model container [2021-11-12 22:51:45,671 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:51:45" (1/1) ... [2021-11-12 22:51:45,680 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 22:51:45,710 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 22:51:45,904 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_0d54ba9a-91f2-463e-bf77-c82675307e25/sv-benchmarks/c/nla-digbench-scaling/divbin_unwindbound20.i[950,963] [2021-11-12 22:51:45,921 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:51:45,932 INFO L203 MainTranslator]: Completed pre-run [2021-11-12 22:51:45,946 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_0d54ba9a-91f2-463e-bf77-c82675307e25/sv-benchmarks/c/nla-digbench-scaling/divbin_unwindbound20.i[950,963] [2021-11-12 22:51:45,954 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:51:45,970 INFO L208 MainTranslator]: Completed translation [2021-11-12 22:51:45,970 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:45 WrapperNode [2021-11-12 22:51:45,971 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 22:51:45,972 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-12 22:51:45,972 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-12 22:51:45,972 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-12 22:51:45,983 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:45" (1/1) ... [2021-11-12 22:51:45,991 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:45" (1/1) ... [2021-11-12 22:51:46,012 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-12 22:51:46,013 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-12 22:51:46,013 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-12 22:51:46,013 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-12 22:51:46,023 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:45" (1/1) ... [2021-11-12 22:51:46,023 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:45" (1/1) ... [2021-11-12 22:51:46,025 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:45" (1/1) ... [2021-11-12 22:51:46,025 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:45" (1/1) ... [2021-11-12 22:51:46,031 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:45" (1/1) ... [2021-11-12 22:51:46,053 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:45" (1/1) ... [2021-11-12 22:51:46,055 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:45" (1/1) ... [2021-11-12 22:51:46,064 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-12 22:51:46,066 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-12 22:51:46,066 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-12 22:51:46,066 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-12 22:51:46,071 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:45" (1/1) ... [2021-11-12 22:51:46,080 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:51:46,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:51:46,107 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-12 22:51:46,117 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-12 22:51:46,148 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-12 22:51:46,148 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-12 22:51:46,148 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-12 22:51:46,148 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-12 22:51:46,149 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-12 22:51:46,149 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-12 22:51:46,149 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-12 22:51:46,154 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-12 22:51:46,429 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-12 22:51:46,430 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-12 22:51:46,432 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 10:51:46 BoogieIcfgContainer [2021-11-12 22:51:46,433 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-12 22:51:46,435 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-12 22:51:46,435 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-12 22:51:46,440 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-12 22:51:46,440 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 10:51:45" (1/3) ... [2021-11-12 22:51:46,441 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54e8da3f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 10:51:46, skipping insertion in model container [2021-11-12 22:51:46,441 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:51:45" (2/3) ... [2021-11-12 22:51:46,442 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54e8da3f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 10:51:46, skipping insertion in model container [2021-11-12 22:51:46,442 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 10:51:46" (3/3) ... [2021-11-12 22:51:46,443 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin_unwindbound20.i [2021-11-12 22:51:46,450 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-12 22:51:46,450 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-12 22:51:46,513 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-12 22:51:46,522 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 [2021-11-12 22:51:46,522 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-12 22:51:46,542 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-12 22:51:46,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-12 22:51:46,549 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:51:46,550 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:51:46,550 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:51:46,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:51:46,557 INFO L85 PathProgramCache]: Analyzing trace with hash -1734137638, now seen corresponding path program 1 times [2021-11-12 22:51:46,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:51:46,569 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2107783209] [2021-11-12 22:51:46,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:51:46,571 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:51:46,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:51:46,746 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:51:46,747 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:51:46,747 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2107783209] [2021-11-12 22:51:46,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2107783209] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:51:46,749 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:51:46,749 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-12 22:51:46,751 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961819352] [2021-11-12 22:51:46,752 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:51:46,756 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-12 22:51:46,757 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:51:46,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-12 22:51:46,789 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-12 22:51:46,791 INFO L87 Difference]: Start difference. First operand has 22 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 22:51:46,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:51:46,823 INFO L93 Difference]: Finished difference Result 35 states and 49 transitions. [2021-11-12 22:51:46,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-12 22:51:46,826 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2021-11-12 22:51:46,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:51:46,834 INFO L225 Difference]: With dead ends: 35 [2021-11-12 22:51:46,834 INFO L226 Difference]: Without dead ends: 20 [2021-11-12 22:51:46,837 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-12 22:51:46,842 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.58ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.79ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.27ms IncrementalHoareTripleChecker+Time [2021-11-12 22:51:46,843 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 4 Unknown, 0 Unchecked, 0.79ms Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 13.27ms Time] [2021-11-12 22:51:46,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-12 22:51:46,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-12 22:51:46,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-12 22:51:46,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 25 transitions. [2021-11-12 22:51:46,910 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 25 transitions. Word has length 14 [2021-11-12 22:51:46,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:51:46,912 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 25 transitions. [2021-11-12 22:51:46,912 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 22:51:46,913 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 25 transitions. [2021-11-12 22:51:46,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-12 22:51:46,915 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:51:46,915 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:51:46,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-12 22:51:46,916 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:51:46,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:51:46,917 INFO L85 PathProgramCache]: Analyzing trace with hash -207211284, now seen corresponding path program 1 times [2021-11-12 22:51:46,917 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:51:46,918 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119530002] [2021-11-12 22:51:46,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:51:46,918 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:51:46,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:51:47,015 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:51:47,016 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:51:47,016 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119530002] [2021-11-12 22:51:47,016 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2119530002] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:51:47,017 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:51:47,017 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 22:51:47,017 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [614642999] [2021-11-12 22:51:47,017 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:51:47,019 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 22:51:47,019 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:51:47,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 22:51:47,020 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:51:47,020 INFO L87 Difference]: Start difference. First operand 20 states and 25 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 22:51:47,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:51:47,055 INFO L93 Difference]: Finished difference Result 33 states and 41 transitions. [2021-11-12 22:51:47,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 22:51:47,056 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 16 [2021-11-12 22:51:47,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:51:47,057 INFO L225 Difference]: With dead ends: 33 [2021-11-12 22:51:47,058 INFO L226 Difference]: Without dead ends: 22 [2021-11-12 22:51:47,058 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:51:47,060 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 3 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.06ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.85ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.51ms IncrementalHoareTripleChecker+Time [2021-11-12 22:51:47,061 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 53 Invalid, 15 Unknown, 0 Unchecked, 1.85ms Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 23.51ms Time] [2021-11-12 22:51:47,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-12 22:51:47,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-11-12 22:51:47,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 16 states have internal predecessors, (20), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-12 22:51:47,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2021-11-12 22:51:47,069 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 16 [2021-11-12 22:51:47,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:51:47,070 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2021-11-12 22:51:47,070 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 22:51:47,070 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2021-11-12 22:51:47,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-12 22:51:47,071 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:51:47,072 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:51:47,072 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-12 22:51:47,072 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:51:47,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:51:47,073 INFO L85 PathProgramCache]: Analyzing trace with hash 1776102932, now seen corresponding path program 1 times [2021-11-12 22:51:47,074 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:51:47,074 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1005966736] [2021-11-12 22:51:47,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:51:47,074 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:51:47,116 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-12 22:51:47,117 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [417489488] [2021-11-12 22:51:47,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:51:47,117 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:51:47,117 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:51:47,122 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:51:47,127 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-12 22:51:47,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:51:47,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-12 22:51:47,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:51:47,720 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:51:47,726 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:51:47,942 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:51:47,942 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:51:47,943 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1005966736] [2021-11-12 22:51:47,943 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-12 22:51:47,943 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [417489488] [2021-11-12 22:51:47,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [417489488] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:51:47,944 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-12 22:51:47,944 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 10 [2021-11-12 22:51:47,944 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1367617527] [2021-11-12 22:51:47,945 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:51:47,945 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:51:47,946 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:51:47,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:51:47,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-12 22:51:47,947 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 22:51:50,226 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-12 22:51:52,237 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-12 22:51:52,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:51:52,379 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2021-11-12 22:51:52,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 22:51:52,381 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2021-11-12 22:51:52,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:51:52,383 INFO L225 Difference]: With dead ends: 34 [2021-11-12 22:51:52,383 INFO L226 Difference]: Without dead ends: 31 [2021-11-12 22:51:52,384 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-12 22:51:52,385 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 12 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4200.78ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.97ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4399.82ms IncrementalHoareTripleChecker+Time [2021-11-12 22:51:52,386 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 81 Invalid, 47 Unknown, 0 Unchecked, 5.97ms Time], IncrementalHoareTripleChecker [2 Valid, 44 Invalid, 1 Unknown, 0 Unchecked, 4399.82ms Time] [2021-11-12 22:51:52,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-12 22:51:52,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-11-12 22:51:52,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 23 states have internal predecessors, (28), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-12 22:51:52,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2021-11-12 22:51:52,397 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 17 [2021-11-12 22:51:52,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:51:52,398 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2021-11-12 22:51:52,398 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 22:51:52,398 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2021-11-12 22:51:52,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-12 22:51:52,400 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:51:52,400 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:51:52,442 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-12 22:51:52,614 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:51:52,615 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:51:52,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:51:52,616 INFO L85 PathProgramCache]: Analyzing trace with hash 1737998361, now seen corresponding path program 1 times [2021-11-12 22:51:52,616 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:51:52,616 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2051879936] [2021-11-12 22:51:52,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:51:52,617 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:51:52,652 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-12 22:51:52,652 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [433845981] [2021-11-12 22:51:52,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:51:52,653 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:51:52,653 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:51:52,661 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:51:52,663 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-12 22:51:52,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:51:52,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 22:51:52,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:51:52,798 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:51:52,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:51:52,926 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:51:52,927 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:51:52,927 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2051879936] [2021-11-12 22:51:52,927 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-12 22:51:52,935 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [433845981] [2021-11-12 22:51:52,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [433845981] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:51:52,936 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1252052930] [2021-11-12 22:51:52,973 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-12 22:51:52,973 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:51:52,980 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-12 22:51:52,987 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-12 22:51:52,988 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-12 22:51:53,035 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:51:53,041 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-12 22:51:53,041 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:51:53,042 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-12 22:51:53,046 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-12 22:51:53,047 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:51:53,048 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-12 22:51:53,052 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-12 22:51:53,076 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_8|], 10=[|v_#valid_9|]} [2021-11-12 22:51:53,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-12 22:51:53,104 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-12 22:51:53,105 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:51:53,105 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-12 22:51:53,107 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:51:53,108 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-12 22:51:53,109 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-12 22:51:53,110 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,168 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:51:53,179 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-12 22:51:53,181 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-12 22:51:53,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-12 22:51:53,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-12 22:51:53,199 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-12 22:51:53,201 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:51:53,205 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-12 22:51:53,206 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:51:53,207 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-12 22:51:53,207 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-12 22:51:53,209 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,245 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:51:53,247 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:51:53,254 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 74 [2021-11-12 22:51:53,255 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-12 22:51:53,256 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:89, output treesize:74 [2021-11-12 22:51:53,274 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:51:53,289 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 81 [2021-11-12 22:51:53,298 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:51:53,310 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-12 22:51:53,319 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:51:53,343 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 81 [2021-11-12 22:51:53,349 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:51:53,362 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-12 22:51:53,365 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,382 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,401 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,460 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,467 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,479 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,487 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,507 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,515 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,526 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,532 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,559 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,564 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,584 INFO L180 QuantifierPusher]: treesize reduction 33, result has 76.3 percent of original size [2021-11-12 22:51:53,607 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-12 22:51:53,610 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:51:53,624 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-11-12 22:51:53,630 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-12 22:51:53,639 INFO L180 QuantifierPusher]: treesize reduction 33, result has 77.4 percent of original size [2021-11-12 22:51:53,653 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-12 22:51:53,666 INFO L180 QuantifierPusher]: treesize reduction 33, result has 76.3 percent of original size [2021-11-12 22:51:53,675 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-12 22:51:53,681 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:51:53,693 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-11-12 22:51:53,695 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-12 22:51:53,704 INFO L180 QuantifierPusher]: treesize reduction 33, result has 77.4 percent of original size [2021-11-12 22:51:53,710 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-12 22:51:53,713 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,727 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,731 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,750 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,760 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,769 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,788 INFO L180 QuantifierPusher]: treesize reduction 33, result has 76.6 percent of original size [2021-11-12 22:51:53,792 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 104 [2021-11-12 22:51:53,804 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.2 percent of original size [2021-11-12 22:51:53,807 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-12 22:51:53,815 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:51:53,820 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 110 [2021-11-12 22:51:53,826 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:51:53,831 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 115 [2021-11-12 22:51:53,836 INFO L180 QuantifierPusher]: treesize reduction 5, result has 95.8 percent of original size [2021-11-12 22:51:53,840 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 110 [2021-11-12 22:51:53,846 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,864 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,910 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:53,963 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:51:53,979 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 260 [2021-11-12 22:51:53,988 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:51:54,005 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 265 [2021-11-12 22:51:54,013 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:51:54,026 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 267 [2021-11-12 22:51:54,040 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:54,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:54,099 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:54,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:54,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:54,106 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:54,127 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:54,134 INFO L180 QuantifierPusher]: treesize reduction 30, result has 57.7 percent of original size [2021-11-12 22:51:54,137 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-12 22:51:54,140 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:51:54,144 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 47 [2021-11-12 22:51:54,146 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:51:54,148 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 45 [2021-11-12 22:51:54,156 INFO L180 QuantifierPusher]: treesize reduction 30, result has 57.7 percent of original size [2021-11-12 22:51:54,160 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-12 22:51:54,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:54,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:54,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:54,205 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:54,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:54,242 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:54,255 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:54,276 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:54,314 INFO L180 QuantifierPusher]: treesize reduction 6, result has 96.7 percent of original size [2021-11-12 22:51:54,322 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 172 [2021-11-12 22:51:54,327 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:54,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:54,357 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:54,359 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:54,390 INFO L180 QuantifierPusher]: treesize reduction 4, result has 97.9 percent of original size [2021-11-12 22:51:54,398 INFO L185 QuantifierPusher]: treesize reduction 33, result has 56.0 percent of original size 42 [2021-11-12 22:51:54,403 INFO L180 QuantifierPusher]: treesize reduction 33, result has 60.7 percent of original size [2021-11-12 22:51:54,405 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 47 [2021-11-12 22:51:54,408 INFO L180 QuantifierPusher]: treesize reduction 50, result has 2.0 percent of original size [2021-11-12 22:51:54,409 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-12 22:51:54,414 INFO L180 QuantifierPusher]: treesize reduction 33, result has 76.3 percent of original size [2021-11-12 22:51:54,420 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-12 22:51:54,421 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:51:54,429 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-11-12 22:51:54,431 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-12 22:51:54,433 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:51:54,445 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 81 [2021-11-12 22:51:54,445 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:54,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:54,462 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:54,466 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:51:54,482 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 66 for LOIs [2021-11-12 22:51:54,486 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-12 22:51:56,373 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1252052930] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:51:56,373 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:51:56,373 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [4, 5] total 18 [2021-11-12 22:51:56,374 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179683181] [2021-11-12 22:51:56,374 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:51:56,374 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-12 22:51:56,374 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:51:56,375 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-12 22:51:56,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=234, Unknown=0, NotChecked=0, Total=306 [2021-11-12 22:51:56,376 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand has 12 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-12 22:51:59,415 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-12 22:52:02,289 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.87s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-12 22:52:02,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:52:02,394 INFO L93 Difference]: Finished difference Result 50 states and 62 transitions. [2021-11-12 22:52:02,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-12 22:52:02,395 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 19 [2021-11-12 22:52:02,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:52:02,396 INFO L225 Difference]: With dead ends: 50 [2021-11-12 22:52:02,396 INFO L226 Difference]: Without dead ends: 39 [2021-11-12 22:52:02,397 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=94, Invalid=326, Unknown=0, NotChecked=0, Total=420 [2021-11-12 22:52:02,398 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 13 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 14 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5099.08ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.86ms SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5289.29ms IncrementalHoareTripleChecker+Time [2021-11-12 22:52:02,398 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 71 Invalid, 165 Unknown, 0 Unchecked, 3.86ms Time], IncrementalHoareTripleChecker [14 Valid, 149 Invalid, 2 Unknown, 0 Unchecked, 5289.29ms Time] [2021-11-12 22:52:02,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-12 22:52:02,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 33. [2021-11-12 22:52:02,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 24 states have (on average 1.25) internal successors, (30), 25 states have internal predecessors, (30), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-12 22:52:02,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2021-11-12 22:52:02,409 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 19 [2021-11-12 22:52:02,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:52:02,409 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2021-11-12 22:52:02,410 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-12 22:52:02,410 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2021-11-12 22:52:02,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-12 22:52:02,411 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:52:02,411 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:52:02,442 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-12 22:52:02,634 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:52:02,635 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:52:02,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:52:02,635 INFO L85 PathProgramCache]: Analyzing trace with hash 1736210901, now seen corresponding path program 1 times [2021-11-12 22:52:02,635 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:52:02,635 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1353705125] [2021-11-12 22:52:02,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:02,636 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:52:02,647 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-12 22:52:02,647 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [636766385] [2021-11-12 22:52:02,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:02,647 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:52:02,647 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:52:02,669 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:52:02,680 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-12 22:52:02,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:02,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 22:52:02,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:02,794 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:52:02,795 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:02,878 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:52:02,878 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:52:02,878 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1353705125] [2021-11-12 22:52:02,878 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-12 22:52:02,878 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [636766385] [2021-11-12 22:52:02,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [636766385] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:52:02,879 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [18596708] [2021-11-12 22:52:02,881 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-12 22:52:02,881 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:52:02,882 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-12 22:52:02,882 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-12 22:52:02,882 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-12 22:52:02,895 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:02,896 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-12 22:52:02,897 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:02,897 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-12 22:52:02,898 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-12 22:52:02,898 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:02,901 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-12 22:52:02,902 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-12 22:52:02,907 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_9|], 10=[|v_#valid_10|]} [2021-11-12 22:52:02,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-12 22:52:02,916 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-12 22:52:02,916 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:02,917 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-12 22:52:02,917 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:02,919 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-12 22:52:02,920 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-12 22:52:02,920 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:02,927 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:02,931 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-12 22:52:02,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-12 22:52:02,933 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-12 22:52:02,939 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-12 22:52:02,942 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-12 22:52:02,942 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:02,945 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-12 22:52:02,945 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:02,946 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-12 22:52:02,946 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-12 22:52:02,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:02,949 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:02,950 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:02,951 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 74 [2021-11-12 22:52:02,951 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-12 22:52:02,952 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:89, output treesize:74 [2021-11-12 22:52:02,958 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:02,964 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 81 [2021-11-12 22:52:02,970 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:02,976 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-12 22:52:02,980 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:02,991 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 81 [2021-11-12 22:52:02,995 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:03,006 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-12 22:52:03,008 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,012 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,016 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,024 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,028 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,031 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,041 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,045 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,047 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,052 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,056 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,060 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,062 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,072 INFO L180 QuantifierPusher]: treesize reduction 33, result has 76.3 percent of original size [2021-11-12 22:52:03,081 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-12 22:52:03,082 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:03,090 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-11-12 22:52:03,091 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-12 22:52:03,096 INFO L180 QuantifierPusher]: treesize reduction 33, result has 77.4 percent of original size [2021-11-12 22:52:03,102 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-12 22:52:03,110 INFO L180 QuantifierPusher]: treesize reduction 33, result has 76.3 percent of original size [2021-11-12 22:52:03,114 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-12 22:52:03,114 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:03,120 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-11-12 22:52:03,122 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-12 22:52:03,130 INFO L180 QuantifierPusher]: treesize reduction 33, result has 77.4 percent of original size [2021-11-12 22:52:03,135 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-12 22:52:03,137 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,142 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,147 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,155 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,158 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,162 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,176 INFO L180 QuantifierPusher]: treesize reduction 33, result has 76.6 percent of original size [2021-11-12 22:52:03,182 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 104 [2021-11-12 22:52:03,187 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.2 percent of original size [2021-11-12 22:52:03,190 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-12 22:52:03,194 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:03,196 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 110 [2021-11-12 22:52:03,199 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:03,201 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 113 [2021-11-12 22:52:03,204 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-12 22:52:03,206 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 110 [2021-11-12 22:52:03,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,220 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,233 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,260 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:03,266 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 257 [2021-11-12 22:52:03,271 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:03,279 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 262 [2021-11-12 22:52:03,284 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:03,290 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 264 [2021-11-12 22:52:03,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,331 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,332 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,333 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,335 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,336 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,340 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,345 INFO L180 QuantifierPusher]: treesize reduction 30, result has 57.7 percent of original size [2021-11-12 22:52:03,347 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 42 [2021-11-12 22:52:03,348 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:03,349 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 47 [2021-11-12 22:52:03,351 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:03,352 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 45 [2021-11-12 22:52:03,358 INFO L180 QuantifierPusher]: treesize reduction 30, result has 57.7 percent of original size [2021-11-12 22:52:03,360 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 43 [2021-11-12 22:52:03,362 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,383 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,402 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,426 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,446 INFO L180 QuantifierPusher]: treesize reduction 6, result has 96.7 percent of original size [2021-11-12 22:52:03,450 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 173 [2021-11-12 22:52:03,454 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,467 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,477 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,480 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,503 INFO L180 QuantifierPusher]: treesize reduction 4, result has 97.9 percent of original size [2021-11-12 22:52:03,508 INFO L185 QuantifierPusher]: treesize reduction 33, result has 56.6 percent of original size 43 [2021-11-12 22:52:03,513 INFO L180 QuantifierPusher]: treesize reduction 33, result has 61.2 percent of original size [2021-11-12 22:52:03,515 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 48 [2021-11-12 22:52:03,518 INFO L180 QuantifierPusher]: treesize reduction 4, result has 92.5 percent of original size [2021-11-12 22:52:03,520 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 43 [2021-11-12 22:52:03,524 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:03,544 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-12 22:52:03,545 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:03,551 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-12 22:52:03,552 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:03,552 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 13 [2021-11-12 22:52:03,553 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-12 22:52:03,555 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-12 22:52:03,556 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:03,561 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-11-12 22:52:03,562 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-12 22:52:03,566 INFO L180 QuantifierPusher]: treesize reduction 33, result has 76.3 percent of original size [2021-11-12 22:52:03,569 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-12 22:52:03,570 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:03,576 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-11-12 22:52:03,578 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-12 22:52:03,580 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:03,587 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 81 [2021-11-12 22:52:03,588 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,606 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:03,617 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2021-11-12 22:52:03,625 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 66 for LOIs [2021-11-12 22:52:03,629 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-12 22:52:05,798 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-12 22:52:05,798 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:52:05,798 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2021-11-12 22:52:05,799 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238616059] [2021-11-12 22:52:05,799 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-12 22:52:05,799 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-12 22:52:05,799 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:52:05,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-12 22:52:05,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2021-11-12 22:52:05,800 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-12 22:52:05,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:52:05,930 INFO L93 Difference]: Finished difference Result 62 states and 74 transitions. [2021-11-12 22:52:05,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-12 22:52:05,931 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 19 [2021-11-12 22:52:05,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:52:05,932 INFO L225 Difference]: With dead ends: 62 [2021-11-12 22:52:05,932 INFO L226 Difference]: Without dead ends: 53 [2021-11-12 22:52:05,933 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2021-11-12 22:52:05,934 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 28 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 60.74ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.51ms SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 73.55ms IncrementalHoareTripleChecker+Time [2021-11-12 22:52:05,934 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 95 Invalid, 52 Unknown, 0 Unchecked, 1.51ms Time], IncrementalHoareTripleChecker [13 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 73.55ms Time] [2021-11-12 22:52:05,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-11-12 22:52:05,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 41. [2021-11-12 22:52:05,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 32 states have (on average 1.25) internal successors, (40), 33 states have internal predecessors, (40), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-12 22:52:05,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2021-11-12 22:52:05,943 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 19 [2021-11-12 22:52:05,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:52:05,943 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2021-11-12 22:52:05,943 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-12 22:52:05,943 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2021-11-12 22:52:05,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-12 22:52:05,944 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:52:05,944 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:52:05,979 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-12 22:52:06,158 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-11-12 22:52:06,159 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:52:06,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:52:06,159 INFO L85 PathProgramCache]: Analyzing trace with hash 1948059783, now seen corresponding path program 1 times [2021-11-12 22:52:06,159 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:52:06,159 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1354471025] [2021-11-12 22:52:06,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:06,160 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:52:06,180 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-12 22:52:06,180 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [492692733] [2021-11-12 22:52:06,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:06,180 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:52:06,180 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:52:06,194 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:52:06,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-12 22:52:06,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:06,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-12 22:52:06,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:06,529 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:52:06,529 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:06,764 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:52:06,765 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1354471025] [2021-11-12 22:52:06,765 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-12 22:52:06,765 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [492692733] [2021-11-12 22:52:06,765 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [|ULTIMATE.start_main_~b~0#1|] [2021-11-12 22:52:06,765 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [676991060] [2021-11-12 22:52:06,770 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-12 22:52:06,770 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 22:52:06,771 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-12 22:52:06,771 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-12 22:52:06,771 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-12 22:52:06,787 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:06,788 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-12 22:52:06,789 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:06,789 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-11-12 22:52:06,790 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-12 22:52:06,790 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:06,790 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-11-12 22:52:06,792 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-11-12 22:52:06,798 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_10|], 10=[|v_#valid_11|]} [2021-11-12 22:52:06,805 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-12 22:52:06,807 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-12 22:52:06,807 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:06,808 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-12 22:52:06,808 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:06,809 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-11-12 22:52:06,809 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-12 22:52:06,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:06,812 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:06,816 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-12 22:52:06,826 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-12 22:52:06,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-12 22:52:06,833 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-12 22:52:06,839 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-12 22:52:06,839 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:06,842 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-12 22:52:06,843 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:06,843 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-12 22:52:06,843 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-12 22:52:06,844 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:06,846 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:06,847 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:06,848 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 74 [2021-11-12 22:52:06,849 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-12 22:52:06,849 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:89, output treesize:74 [2021-11-12 22:52:06,855 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:06,863 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 81 [2021-11-12 22:52:06,867 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:06,872 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-12 22:52:06,877 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:06,883 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 81 [2021-11-12 22:52:06,885 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:06,889 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 79 [2021-11-12 22:52:06,892 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:06,895 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:06,898 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:06,901 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:06,905 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:06,908 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:06,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:06,913 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:06,917 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:06,920 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:06,923 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:06,925 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:06,930 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:06,932 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:06,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:06,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:06,948 INFO L180 QuantifierPusher]: treesize reduction 33, result has 76.3 percent of original size [2021-11-12 22:52:06,951 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-12 22:52:06,952 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:06,960 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-11-12 22:52:06,961 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-12 22:52:06,965 INFO L180 QuantifierPusher]: treesize reduction 33, result has 77.4 percent of original size [2021-11-12 22:52:06,976 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-12 22:52:06,984 INFO L180 QuantifierPusher]: treesize reduction 33, result has 76.3 percent of original size [2021-11-12 22:52:06,990 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-12 22:52:06,992 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:06,998 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-11-12 22:52:06,999 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-12 22:52:07,008 INFO L180 QuantifierPusher]: treesize reduction 33, result has 77.4 percent of original size [2021-11-12 22:52:07,012 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 90 [2021-11-12 22:52:07,015 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,024 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,025 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,030 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,037 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,038 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,049 INFO L180 QuantifierPusher]: treesize reduction 33, result has 76.6 percent of original size [2021-11-12 22:52:07,051 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 104 [2021-11-12 22:52:07,054 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.2 percent of original size [2021-11-12 22:52:07,056 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 101 [2021-11-12 22:52:07,059 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:07,062 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 110 [2021-11-12 22:52:07,064 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:07,067 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 113 [2021-11-12 22:52:07,069 INFO L180 QuantifierPusher]: treesize reduction 3, result has 97.4 percent of original size [2021-11-12 22:52:07,072 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 110 [2021-11-12 22:52:07,076 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,084 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,125 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:07,131 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 257 [2021-11-12 22:52:07,135 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:07,143 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 262 [2021-11-12 22:52:07,148 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:07,157 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 264 [2021-11-12 22:52:07,166 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,209 INFO L180 QuantifierPusher]: treesize reduction 30, result has 57.7 percent of original size [2021-11-12 22:52:07,211 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 43 [2021-11-12 22:52:07,212 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:07,214 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 48 [2021-11-12 22:52:07,216 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:07,218 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-11-12 22:52:07,223 INFO L180 QuantifierPusher]: treesize reduction 30, result has 57.7 percent of original size [2021-11-12 22:52:07,230 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 43 [2021-11-12 22:52:07,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,240 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,249 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,253 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,264 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,271 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,279 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,299 INFO L180 QuantifierPusher]: treesize reduction 6, result has 96.7 percent of original size [2021-11-12 22:52:07,304 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 173 [2021-11-12 22:52:07,309 INFO L180 QuantifierPusher]: treesize reduction 31, result has 58.7 percent of original size [2021-11-12 22:52:07,311 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-12 22:52:07,314 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:07,316 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 38 [2021-11-12 22:52:07,319 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:07,329 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-12 22:52:07,330 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:07,334 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-12 22:52:07,335 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:07,336 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 13 [2021-11-12 22:52:07,336 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-11-12 22:52:07,339 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-12 22:52:07,340 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:07,345 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-11-12 22:52:07,346 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-11-12 22:52:07,350 INFO L180 QuantifierPusher]: treesize reduction 33, result has 76.3 percent of original size [2021-11-12 22:52:07,370 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-12 22:52:07,371 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:07,378 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-11-12 22:52:07,380 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 87 [2021-11-12 22:52:07,382 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-12 22:52:07,389 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 81 [2021-11-12 22:52:07,390 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,395 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,402 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,405 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-12 22:52:07,431 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2021-11-12 22:52:07,437 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 66 for LOIs [2021-11-12 22:52:07,441 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-12 22:52:09,907 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-12 22:52:09,907 INFO L186 FreeRefinementEngine]: Found 0 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:52:09,907 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [] total 0 [2021-11-12 22:52:09,907 ERROR L172 FreeRefinementEngine]: Strategy SIFA_TAIPAN failed to provide any proof altough trace is infeasible [2021-11-12 22:52:09,908 INFO L628 BasicCegarLoop]: Counterexample might be feasible [2021-11-12 22:52:09,914 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-12 22:52:09,951 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-12 22:52:10,134 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable109,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:52:10,138 INFO L732 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1] [2021-11-12 22:52:10,140 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-12 22:52:10,152 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 12.11 10:52:10 BoogieIcfgContainer [2021-11-12 22:52:10,152 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-12 22:52:10,153 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-12 22:52:10,153 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-12 22:52:10,153 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-12 22:52:10,154 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 10:51:46" (3/4) ... [2021-11-12 22:52:10,157 INFO L140 WitnessPrinter]: No result that supports witness generation found [2021-11-12 22:52:10,157 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-12 22:52:10,158 INFO L158 Benchmark]: Toolchain (without parser) took 24498.75ms. Allocated memory was 77.6MB in the beginning and 125.8MB in the end (delta: 48.2MB). Free memory was 41.0MB in the beginning and 67.7MB in the end (delta: -26.7MB). Peak memory consumption was 20.4MB. Max. memory is 16.1GB. [2021-11-12 22:52:10,158 INFO L158 Benchmark]: CDTParser took 0.28ms. Allocated memory is still 77.6MB. Free memory was 57.1MB in the beginning and 57.1MB in the end (delta: 45.3kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-12 22:52:10,159 INFO L158 Benchmark]: CACSL2BoogieTranslator took 306.27ms. Allocated memory was 77.6MB in the beginning and 98.6MB in the end (delta: 21.0MB). Free memory was 40.8MB in the beginning and 70.5MB in the end (delta: -29.7MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-12 22:52:10,159 INFO L158 Benchmark]: Boogie Procedure Inliner took 40.24ms. Allocated memory is still 98.6MB. Free memory was 70.5MB in the beginning and 69.0MB in the end (delta: 1.5MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-12 22:52:10,159 INFO L158 Benchmark]: Boogie Preprocessor took 51.87ms. Allocated memory is still 98.6MB. Free memory was 69.0MB in the beginning and 67.9MB in the end (delta: 1.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-12 22:52:10,159 INFO L158 Benchmark]: RCFGBuilder took 367.26ms. Allocated memory is still 98.6MB. Free memory was 67.9MB in the beginning and 57.1MB in the end (delta: 10.8MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-12 22:52:10,160 INFO L158 Benchmark]: TraceAbstraction took 23717.54ms. Allocated memory was 98.6MB in the beginning and 125.8MB in the end (delta: 27.3MB). Free memory was 56.5MB in the beginning and 67.7MB in the end (delta: -11.2MB). Peak memory consumption was 18.6MB. Max. memory is 16.1GB. [2021-11-12 22:52:10,160 INFO L158 Benchmark]: Witness Printer took 4.45ms. Allocated memory is still 125.8MB. Free memory is still 67.7MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-12 22:52:10,161 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28ms. Allocated memory is still 77.6MB. Free memory was 57.1MB in the beginning and 57.1MB in the end (delta: 45.3kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 306.27ms. Allocated memory was 77.6MB in the beginning and 98.6MB in the end (delta: 21.0MB). Free memory was 40.8MB in the beginning and 70.5MB in the end (delta: -29.7MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 40.24ms. Allocated memory is still 98.6MB. Free memory was 70.5MB in the beginning and 69.0MB in the end (delta: 1.5MB). There was no memory consumed. Max. memory is 16.1GB. * Boogie Preprocessor took 51.87ms. Allocated memory is still 98.6MB. Free memory was 69.0MB in the beginning and 67.9MB in the end (delta: 1.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 367.26ms. Allocated memory is still 98.6MB. Free memory was 67.9MB in the beginning and 57.1MB in the end (delta: 10.8MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * TraceAbstraction took 23717.54ms. Allocated memory was 98.6MB in the beginning and 125.8MB in the end (delta: 27.3MB). Free memory was 56.5MB in the beginning and 67.7MB in the end (delta: -11.2MB). Peak memory consumption was 18.6MB. Max. memory is 16.1GB. * Witness Printer took 4.45ms. Allocated memory is still 125.8MB. Free memory is still 67.7MB. There was no memory consumed. Max. memory is 16.1GB. * 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: 21]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: unable to decide satisfiability of path constraint. Possible FailurePath: [L25] int counter = 0; [L27] unsigned A, B; [L28] unsigned q, r, b; [L29] A = __VERIFIER_nondet_uint() [L30] B = __VERIFIER_nondet_uint() [L31] CALL assume_abort_if_not(B < (0x7fffffff * 2U + 1U)/2) [L16] COND FALSE !(!cond) [L31] RET assume_abort_if_not(B < (0x7fffffff * 2U + 1U)/2) [L32] CALL assume_abort_if_not(B >= 1) [L16] COND FALSE !(!cond) [L32] RET assume_abort_if_not(B >= 1) [L33] q = 0 [L34] r = A [L35] b = B [L36] EXPR counter++ [L36] COND TRUE counter++<20 [L37] COND FALSE !(!(r >= b)) [L38] b = 2 * b [L36] EXPR counter++ [L36] COND TRUE counter++<20 [L37] COND TRUE !(r >= b) [L40] EXPR counter++ [L40] COND TRUE counter++<20 [L41] CALL __VERIFIER_assert(A == q * b + r) [L19] COND TRUE !(cond) [L21] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 22 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 23.6s, OverallIterations: 6, TraceHistogramMax: 2, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 10.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 3 mSolverCounterUnknown, 60 SdHoareTripleChecker+Valid, 9799.44ms IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 56 mSDsluCounter, 323 SdHoareTripleChecker+Invalid, 9390.24ms Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 241 mSDsCounter, 29 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 251 IncrementalHoareTripleChecker+Invalid, 283 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 29 mSolverCounterUnsat, 98 mSDtfsCounter, 251 mSolverCounterSat, 13.98ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 155 GetRequests, 101 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 5.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=41occurred in iteration=5, InterpolantAutomatonStates: 35, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 5 MinimizatonAttempts, 18 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.7s InterpolantComputationTime, 105 NumberOfCodeBlocks, 105 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 151 ConstructedInterpolants, 0 QuantifiedInterpolants, 565 SizeOfPredicates, 8 NumberOfNonLiveVariables, 298 ConjunctsInSsa, 40 ConjunctsInUnsatCore, 9 InterpolantComputations, 3 PerfectInterpolantSequences, 17/29 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: OVERALL_TIME: 1513.40ms, ICFG_INTERPRETER_ENTERED_PROCEDURES: 2, DAG_INTERPRETER_EARLY_EXIT_QUERIES_NONTRIVIAL: 15, DAG_INTERPRETER_EARLY_EXITS: 1, TOOLS_POST_APPLICATIONS: 20, TOOLS_POST_TIME: 414.60ms, TOOLS_POST_CALL_APPLICATIONS: 6, TOOLS_POST_CALL_TIME: 181.80ms, TOOLS_POST_RETURN_APPLICATIONS: 4, TOOLS_POST_RETURN_TIME: 79.22ms, TOOLS_QUANTIFIERELIM_APPLICATIONS: 30, TOOLS_QUANTIFIERELIM_TIME: 658.13ms, TOOLS_QUANTIFIERELIM_MAX_TIME: 222.78ms, FLUID_QUERY_TIME: 4.34ms, FLUID_QUERIES: 48, FLUID_YES_ANSWERS: 0, DOMAIN_JOIN_APPLICATIONS: 10, DOMAIN_JOIN_TIME: 510.78ms, DOMAIN_ALPHA_APPLICATIONS: 0, DOMAIN_ALPHA_TIME: 0.00ms, DOMAIN_WIDEN_APPLICATIONS: 2, DOMAIN_WIDEN_TIME: 199.36ms, DOMAIN_ISSUBSETEQ_APPLICATIONS: 3, DOMAIN_ISSUBSETEQ_TIME: 17.26ms, DOMAIN_ISBOTTOM_APPLICATIONS: 15, DOMAIN_ISBOTTOM_TIME: 35.56ms, LOOP_SUMMARIZER_APPLICATIONS: 1, LOOP_SUMMARIZER_CACHE_MISSES: 1, LOOP_SUMMARIZER_OVERALL_TIME: 342.64ms, LOOP_SUMMARIZER_NEW_COMPUTATION_TIME: 342.54ms, LOOP_SUMMARIZER_FIXPOINT_ITERATIONS: 3, CALL_SUMMARIZER_APPLICATIONS: 4, CALL_SUMMARIZER_CACHE_MISSES: 1, CALL_SUMMARIZER_OVERALL_TIME: 2.30ms, CALL_SUMMARIZER_NEW_COMPUTATION_TIME: 2.22ms, PROCEDURE_GRAPH_BUILDER_TIME: 4.64ms, PATH_EXPR_TIME: 4.49ms, REGEX_TO_DAG_TIME: 4.01ms, DAG_COMPRESSION_TIME: 16.13ms, DAG_COMPRESSION_PROCESSED_NODES: 210, DAG_COMPRESSION_RETAINED_NODES: 43, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces [2021-11-12 22:52:10,201 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/divbin_unwindbound20.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF --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 7e073a4c36b82f2b6062e496bb836cd3d16667ec7228f4ab2b6689e74fa81265 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 22:52:12,751 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 22:52:12,755 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 22:52:12,806 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 22:52:12,807 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 22:52:12,811 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 22:52:12,813 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 22:52:12,817 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 22:52:12,821 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 22:52:12,829 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 22:52:12,830 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 22:52:12,832 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 22:52:12,832 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 22:52:12,835 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 22:52:12,837 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 22:52:12,841 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 22:52:12,843 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 22:52:12,844 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 22:52:12,846 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 22:52:12,854 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 22:52:12,856 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 22:52:12,857 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 22:52:12,860 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 22:52:12,862 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 22:52:12,871 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 22:52:12,872 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 22:52:12,872 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 22:52:12,874 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 22:52:12,875 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 22:52:12,876 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 22:52:12,876 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 22:52:12,877 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 22:52:12,879 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 22:52:12,880 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 22:52:12,881 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 22:52:12,881 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 22:52:12,883 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 22:52:12,883 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 22:52:12,883 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 22:52:12,885 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 22:52:12,886 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 22:52:12,887 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-12 22:52:12,932 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 22:52:12,932 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 22:52:12,934 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 22:52:12,934 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 22:52:12,934 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 22:52:12,935 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 22:52:12,935 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 22:52:12,935 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 22:52:12,935 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 22:52:12,935 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 22:52:12,938 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 22:52:12,938 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-12 22:52:12,938 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-12 22:52:12,939 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 22:52:12,939 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 22:52:12,939 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 22:52:12,939 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 22:52:12,940 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-12 22:52:12,940 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-12 22:52:12,940 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-12 22:52:12,940 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-12 22:52:12,941 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 22:52:12,941 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 22:52:12,941 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 22:52:12,941 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 22:52:12,942 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-12 22:52:12,942 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 22:52:12,942 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:52:12,942 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 22:52:12,943 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 22:52:12,943 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 22:52:12,943 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-12 22:52:12,943 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-12 22:52:12,944 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 22:52:12,944 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 22:52:12,944 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 22:52:12,945 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7e073a4c36b82f2b6062e496bb836cd3d16667ec7228f4ab2b6689e74fa81265 [2021-11-12 22:52:13,372 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 22:52:13,397 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 22:52:13,399 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 22:52:13,401 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 22:52:13,402 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 22:52:13,403 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/nla-digbench-scaling/divbin_unwindbound20.i [2021-11-12 22:52:13,485 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/data/1713c6efe/c8bdb1f934e446b0be4634dad3068624/FLAGe30f4a152 [2021-11-12 22:52:13,969 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 22:52:13,970 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/sv-benchmarks/c/nla-digbench-scaling/divbin_unwindbound20.i [2021-11-12 22:52:13,978 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/data/1713c6efe/c8bdb1f934e446b0be4634dad3068624/FLAGe30f4a152 [2021-11-12 22:52:14,370 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/data/1713c6efe/c8bdb1f934e446b0be4634dad3068624 [2021-11-12 22:52:14,374 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 22:52:14,376 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 22:52:14,380 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 22:52:14,380 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 22:52:14,384 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 22:52:14,385 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:52:14" (1/1) ... [2021-11-12 22:52:14,387 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@63723557 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:14, skipping insertion in model container [2021-11-12 22:52:14,388 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:52:14" (1/1) ... [2021-11-12 22:52:14,396 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 22:52:14,415 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 22:52:14,634 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_0d54ba9a-91f2-463e-bf77-c82675307e25/sv-benchmarks/c/nla-digbench-scaling/divbin_unwindbound20.i[950,963] [2021-11-12 22:52:14,676 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:52:14,690 INFO L203 MainTranslator]: Completed pre-run [2021-11-12 22:52:14,717 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_0d54ba9a-91f2-463e-bf77-c82675307e25/sv-benchmarks/c/nla-digbench-scaling/divbin_unwindbound20.i[950,963] [2021-11-12 22:52:14,757 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:52:14,778 INFO L208 MainTranslator]: Completed translation [2021-11-12 22:52:14,783 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:14 WrapperNode [2021-11-12 22:52:14,783 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 22:52:14,784 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-12 22:52:14,784 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-12 22:52:14,785 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-12 22:52:14,792 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:14" (1/1) ... [2021-11-12 22:52:14,801 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:14" (1/1) ... [2021-11-12 22:52:14,819 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-12 22:52:14,820 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-12 22:52:14,820 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-12 22:52:14,821 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-12 22:52:14,829 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:14" (1/1) ... [2021-11-12 22:52:14,830 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:14" (1/1) ... [2021-11-12 22:52:14,832 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:14" (1/1) ... [2021-11-12 22:52:14,833 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:14" (1/1) ... [2021-11-12 22:52:14,838 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:14" (1/1) ... [2021-11-12 22:52:14,843 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:14" (1/1) ... [2021-11-12 22:52:14,844 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:14" (1/1) ... [2021-11-12 22:52:14,847 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-12 22:52:14,854 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-12 22:52:14,854 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-12 22:52:14,854 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-12 22:52:14,855 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:14" (1/1) ... [2021-11-12 22:52:14,862 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:52:14,874 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:52:14,892 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-12 22:52:14,926 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-12 22:52:14,946 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-12 22:52:14,946 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-12 22:52:14,946 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-12 22:52:14,947 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-12 22:52:14,947 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-12 22:52:14,947 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-12 22:52:14,947 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-12 22:52:14,948 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-12 22:52:15,222 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-12 22:52:15,222 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-12 22:52:15,224 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 10:52:15 BoogieIcfgContainer [2021-11-12 22:52:15,224 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-12 22:52:15,226 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-12 22:52:15,226 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-12 22:52:15,228 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-12 22:52:15,229 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 10:52:14" (1/3) ... [2021-11-12 22:52:15,229 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a8fbbbb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 10:52:15, skipping insertion in model container [2021-11-12 22:52:15,230 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:52:14" (2/3) ... [2021-11-12 22:52:15,230 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a8fbbbb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 10:52:15, skipping insertion in model container [2021-11-12 22:52:15,230 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 10:52:15" (3/3) ... [2021-11-12 22:52:15,248 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin_unwindbound20.i [2021-11-12 22:52:15,252 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-12 22:52:15,253 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-12 22:52:15,332 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-12 22:52:15,354 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 [2021-11-12 22:52:15,354 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-12 22:52:15,368 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 20 states have (on average 1.5) internal successors, (30), 21 states have internal predecessors, (30), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-12 22:52:15,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-12 22:52:15,374 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:52:15,375 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:52:15,375 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:52:15,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:52:15,381 INFO L85 PathProgramCache]: Analyzing trace with hash 1267887399, now seen corresponding path program 1 times [2021-11-12 22:52:15,393 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:52:15,407 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [41986669] [2021-11-12 22:52:15,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:15,408 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:52:15,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:52:15,433 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:52:15,462 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-12 22:52:15,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:15,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-12 22:52:15,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:15,673 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:52:15,673 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:15,746 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:52:15,747 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:52:15,748 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [41986669] [2021-11-12 22:52:15,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [41986669] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:52:15,749 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:52:15,749 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-12 22:52:15,751 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261445378] [2021-11-12 22:52:15,751 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:52:15,756 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-12 22:52:15,756 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:52:15,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-12 22:52:15,784 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-12 22:52:15,787 INFO L87 Difference]: Start difference. First operand has 28 states, 20 states have (on average 1.5) internal successors, (30), 21 states have internal predecessors, (30), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 22:52:15,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:52:15,812 INFO L93 Difference]: Finished difference Result 53 states and 76 transitions. [2021-11-12 22:52:15,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-12 22:52:15,815 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2021-11-12 22:52:15,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:52:15,823 INFO L225 Difference]: With dead ends: 53 [2021-11-12 22:52:15,824 INFO L226 Difference]: Without dead ends: 24 [2021-11-12 22:52:15,827 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-12 22:52:15,835 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.00ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.44ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.00ms IncrementalHoareTripleChecker+Time [2021-11-12 22:52:15,837 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 1.44ms Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.00ms Time] [2021-11-12 22:52:15,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-12 22:52:15,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-11-12 22:52:15,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-12 22:52:15,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 30 transitions. [2021-11-12 22:52:15,888 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 30 transitions. Word has length 19 [2021-11-12 22:52:15,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:52:15,888 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 30 transitions. [2021-11-12 22:52:15,890 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 22:52:15,890 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 30 transitions. [2021-11-12 22:52:15,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-12 22:52:15,894 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:52:15,894 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:52:15,913 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-12 22:52:16,114 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:52:16,114 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:52:16,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:52:16,119 INFO L85 PathProgramCache]: Analyzing trace with hash 1485611193, now seen corresponding path program 1 times [2021-11-12 22:52:16,121 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:52:16,122 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [715166613] [2021-11-12 22:52:16,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:16,123 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:52:16,123 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:52:16,125 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:52:16,168 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-12 22:52:16,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:16,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 22:52:16,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:16,353 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:52:16,354 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:16,439 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:52:16,439 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:52:16,440 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [715166613] [2021-11-12 22:52:16,440 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [715166613] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:52:16,440 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:52:16,440 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 4] imperfect sequences [] total 6 [2021-11-12 22:52:16,441 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [37078239] [2021-11-12 22:52:16,441 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:52:16,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:52:16,443 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:52:16,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:52:16,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-12 22:52:16,444 INFO L87 Difference]: Start difference. First operand 24 states and 30 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-12 22:52:16,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:52:16,489 INFO L93 Difference]: Finished difference Result 42 states and 54 transitions. [2021-11-12 22:52:16,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 22:52:16,490 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 21 [2021-11-12 22:52:16,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:52:16,492 INFO L225 Difference]: With dead ends: 42 [2021-11-12 22:52:16,492 INFO L226 Difference]: Without dead ends: 30 [2021-11-12 22:52:16,493 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:52:16,495 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 5 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.71ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.31ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 22.88ms IncrementalHoareTripleChecker+Time [2021-11-12 22:52:16,495 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 71 Invalid, 18 Unknown, 0 Unchecked, 2.31ms Time], IncrementalHoareTripleChecker [4 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 22.88ms Time] [2021-11-12 22:52:16,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-12 22:52:16,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2021-11-12 22:52:16,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 22 states have (on average 1.3181818181818181) internal successors, (29), 23 states have internal predecessors, (29), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-12 22:52:16,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2021-11-12 22:52:16,504 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 21 [2021-11-12 22:52:16,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:52:16,506 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2021-11-12 22:52:16,506 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-12 22:52:16,506 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2021-11-12 22:52:16,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-12 22:52:16,508 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:52:16,508 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:52:16,519 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-12 22:52:16,714 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:52:16,715 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:52:16,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:52:16,716 INFO L85 PathProgramCache]: Analyzing trace with hash -1580975129, now seen corresponding path program 1 times [2021-11-12 22:52:16,716 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:52:16,717 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [559573003] [2021-11-12 22:52:16,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:16,717 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:52:16,717 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:52:16,718 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:52:16,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-12 22:52:16,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:16,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-12 22:52:16,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:17,135 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:52:17,136 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:18,152 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:52:18,152 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:52:18,152 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [559573003] [2021-11-12 22:52:18,153 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [559573003] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:52:18,153 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-12 22:52:18,153 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9] total 13 [2021-11-12 22:52:18,153 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [734226822] [2021-11-12 22:52:18,153 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:52:18,154 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:52:18,154 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:52:18,155 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:52:18,155 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-11-12 22:52:18,156 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 22:52:18,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:52:18,616 INFO L93 Difference]: Finished difference Result 40 states and 49 transitions. [2021-11-12 22:52:18,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 22:52:18,618 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 22 [2021-11-12 22:52:18,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:52:18,620 INFO L225 Difference]: With dead ends: 40 [2021-11-12 22:52:18,620 INFO L226 Difference]: Without dead ends: 37 [2021-11-12 22:52:18,620 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-11-12 22:52:18,622 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 15 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 349.52ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.49ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 387.75ms IncrementalHoareTripleChecker+Time [2021-11-12 22:52:18,622 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 89 Invalid, 35 Unknown, 0 Unchecked, 2.49ms Time], IncrementalHoareTripleChecker [4 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 387.75ms Time] [2021-11-12 22:52:18,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-12 22:52:18,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-11-12 22:52:18,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 28 states have (on average 1.25) internal successors, (35), 29 states have internal predecessors, (35), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-12 22:52:18,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions. [2021-11-12 22:52:18,633 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 22 [2021-11-12 22:52:18,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:52:18,634 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 44 transitions. [2021-11-12 22:52:18,634 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 22:52:18,634 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions. [2021-11-12 22:52:18,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-12 22:52:18,635 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:52:18,636 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:52:18,655 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-12 22:52:18,846 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:52:18,847 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:52:18,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:52:18,848 INFO L85 PathProgramCache]: Analyzing trace with hash -450968108, now seen corresponding path program 1 times [2021-11-12 22:52:18,848 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:52:18,848 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1571908306] [2021-11-12 22:52:18,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:18,849 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:52:18,849 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:52:18,850 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:52:18,851 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-12 22:52:18,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:18,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 22:52:18,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:19,084 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-12 22:52:19,085 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:19,328 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-12 22:52:19,328 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:52:19,329 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1571908306] [2021-11-12 22:52:19,329 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1571908306] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:52:19,329 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:52:19,329 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 7 [2021-11-12 22:52:19,329 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [752592207] [2021-11-12 22:52:19,330 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:52:19,330 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-12 22:52:19,330 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:52:19,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-12 22:52:19,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:52:19,331 INFO L87 Difference]: Start difference. First operand 37 states and 44 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 22:52:19,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:52:19,470 INFO L93 Difference]: Finished difference Result 49 states and 59 transitions. [2021-11-12 22:52:19,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 22:52:19,471 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 25 [2021-11-12 22:52:19,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:52:19,472 INFO L225 Difference]: With dead ends: 49 [2021-11-12 22:52:19,473 INFO L226 Difference]: Without dead ends: 46 [2021-11-12 22:52:19,473 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-12 22:52:19,475 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 15 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 102.25ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.92ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 121.18ms IncrementalHoareTripleChecker+Time [2021-11-12 22:52:19,475 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 85 Invalid, 36 Unknown, 0 Unchecked, 1.92ms Time], IncrementalHoareTripleChecker [4 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 121.18ms Time] [2021-11-12 22:52:19,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-12 22:52:19,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 38. [2021-11-12 22:52:19,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 30 states have internal predecessors, (37), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-12 22:52:19,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2021-11-12 22:52:19,484 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 25 [2021-11-12 22:52:19,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:52:19,484 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2021-11-12 22:52:19,484 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 22:52:19,485 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2021-11-12 22:52:19,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-12 22:52:19,486 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:52:19,486 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:52:19,497 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (5)] Ended with exit code 0 [2021-11-12 22:52:19,697 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:52:19,698 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:52:19,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:52:19,700 INFO L85 PathProgramCache]: Analyzing trace with hash -791365823, now seen corresponding path program 1 times [2021-11-12 22:52:19,701 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:52:19,702 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [40093922] [2021-11-12 22:52:19,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:19,707 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:52:19,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:52:19,708 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:52:19,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-12 22:52:19,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:19,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:52:19,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:19,870 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:52:19,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:19,960 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:52:19,960 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:52:19,960 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [40093922] [2021-11-12 22:52:19,962 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [40093922] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:52:19,963 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:52:19,963 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-12 22:52:19,963 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911780110] [2021-11-12 22:52:19,963 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:52:19,964 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:52:19,964 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:52:19,965 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:52:19,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 22:52:19,965 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand has 3 states, 3 states have (on average 7.0) internal successors, (21), 3 states have internal predecessors, (21), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-12 22:52:19,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:52:19,992 INFO L93 Difference]: Finished difference Result 64 states and 77 transitions. [2021-11-12 22:52:19,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:52:19,993 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.0) internal successors, (21), 3 states have internal predecessors, (21), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 31 [2021-11-12 22:52:19,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:52:19,997 INFO L225 Difference]: With dead ends: 64 [2021-11-12 22:52:19,997 INFO L226 Difference]: Without dead ends: 39 [2021-11-12 22:52:19,997 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 22:52:20,001 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 0 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.54ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.71ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.92ms IncrementalHoareTripleChecker+Time [2021-11-12 22:52:20,001 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 53 Invalid, 9 Unknown, 0 Unchecked, 1.71ms Time], IncrementalHoareTripleChecker [1 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 11.92ms Time] [2021-11-12 22:52:20,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-12 22:52:20,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2021-11-12 22:52:20,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 30 states have internal predecessors, (36), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-12 22:52:20,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 45 transitions. [2021-11-12 22:52:20,017 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 45 transitions. Word has length 31 [2021-11-12 22:52:20,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:52:20,017 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 45 transitions. [2021-11-12 22:52:20,018 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.0) internal successors, (21), 3 states have internal predecessors, (21), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-12 22:52:20,018 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 45 transitions. [2021-11-12 22:52:20,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-12 22:52:20,019 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:52:20,019 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:52:20,036 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-12 22:52:20,219 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:52:20,220 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:52:20,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:52:20,221 INFO L85 PathProgramCache]: Analyzing trace with hash 675416052, now seen corresponding path program 1 times [2021-11-12 22:52:20,221 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:52:20,221 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1410897277] [2021-11-12 22:52:20,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:20,222 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:52:20,222 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:52:20,223 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:52:20,229 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-12 22:52:20,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:20,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-12 22:52:20,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:21,478 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:52:21,478 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:24,950 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:52:24,950 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:52:24,950 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1410897277] [2021-11-12 22:52:24,950 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1410897277] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:52:24,951 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [283917833] [2021-11-12 22:52:24,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:24,951 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:52:24,951 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:52:24,960 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:52:24,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (8)] Waiting until timeout for monitored process [2021-11-12 22:52:25,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:25,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-12 22:52:25,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:27,626 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:52:27,627 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:29,529 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:52:29,529 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [283917833] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:52:29,530 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [682816290] [2021-11-12 22:52:29,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:29,530 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:52:29,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:52:29,555 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:52:29,584 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-12 22:52:29,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:29,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-12 22:52:29,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:31,641 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:52:31,641 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:34,428 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:52:34,428 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [682816290] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:52:34,428 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:52:34,429 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9, 8, 7, 12, 9] total 32 [2021-11-12 22:52:34,429 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1858499708] [2021-11-12 22:52:34,429 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:52:34,430 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-12 22:52:34,430 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:52:34,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-12 22:52:34,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=783, Unknown=0, NotChecked=0, Total=992 [2021-11-12 22:52:34,431 INFO L87 Difference]: Start difference. First operand 38 states and 45 transitions. Second operand has 32 states, 32 states have (on average 2.6875) internal successors, (86), 28 states have internal predecessors, (86), 11 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 9 states have call predecessors, (11), 8 states have call successors, (11) [2021-11-12 22:52:35,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:52:35,450 INFO L93 Difference]: Finished difference Result 77 states and 93 transitions. [2021-11-12 22:52:35,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-12 22:52:35,454 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.6875) internal successors, (86), 28 states have internal predecessors, (86), 11 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 9 states have call predecessors, (11), 8 states have call successors, (11) Word has length 34 [2021-11-12 22:52:35,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:52:35,456 INFO L225 Difference]: With dead ends: 77 [2021-11-12 22:52:35,457 INFO L226 Difference]: Without dead ends: 75 [2021-11-12 22:52:35,458 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 169 SyntacticMatches, 3 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 429 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=297, Invalid=1185, Unknown=0, NotChecked=0, Total=1482 [2021-11-12 22:52:35,459 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 79 mSDsluCounter, 334 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 174.55ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 358 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.84ms SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 36 IncrementalHoareTripleChecker+Unchecked, 193.75ms IncrementalHoareTripleChecker+Time [2021-11-12 22:52:35,462 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 358 Invalid, 125 Unknown, 0 Unchecked, 3.84ms Time], IncrementalHoareTripleChecker [6 Valid, 83 Invalid, 0 Unknown, 36 Unchecked, 193.75ms Time] [2021-11-12 22:52:35,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-12 22:52:35,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 54. [2021-11-12 22:52:35,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 41 states have (on average 1.2195121951219512) internal successors, (50), 43 states have internal predecessors, (50), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-12 22:52:35,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 63 transitions. [2021-11-12 22:52:35,479 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 63 transitions. Word has length 34 [2021-11-12 22:52:35,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:52:35,482 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 63 transitions. [2021-11-12 22:52:35,482 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.6875) internal successors, (86), 28 states have internal predecessors, (86), 11 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 9 states have call predecessors, (11), 8 states have call successors, (11) [2021-11-12 22:52:35,483 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 63 transitions. [2021-11-12 22:52:35,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-12 22:52:35,486 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:52:35,487 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:52:35,535 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-12 22:52:35,719 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-12 22:52:35,912 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (8)] Forceful destruction successful, exit code 0 [2021-11-12 22:52:36,111 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:52:36,111 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:52:36,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:52:36,112 INFO L85 PathProgramCache]: Analyzing trace with hash 673628592, now seen corresponding path program 1 times [2021-11-12 22:52:36,112 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:52:36,113 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [363854256] [2021-11-12 22:52:36,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:36,113 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:52:36,113 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:52:36,114 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:52:36,123 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-12 22:52:36,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:36,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-12 22:52:36,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:36,384 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:52:36,384 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:36,584 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:52:36,584 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:52:36,585 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [363854256] [2021-11-12 22:52:36,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [363854256] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:52:36,585 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [960675501] [2021-11-12 22:52:36,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:36,585 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:52:36,585 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:52:36,586 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:52:36,587 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2021-11-12 22:52:36,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:36,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-12 22:52:36,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:36,816 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:52:36,816 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:36,941 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:52:36,941 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [960675501] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:52:36,942 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1502957796] [2021-11-12 22:52:36,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:36,942 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:52:36,942 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:52:36,947 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:52:36,982 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-12 22:52:37,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:37,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-12 22:52:37,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:37,199 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:52:37,199 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:37,592 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:52:37,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1502957796] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:52:37,592 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:52:37,592 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 6, 7, 7, 8] total 17 [2021-11-12 22:52:37,593 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [200395874] [2021-11-12 22:52:37,593 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:52:37,594 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-12 22:52:37,594 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:52:37,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-12 22:52:37,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=191, Unknown=0, NotChecked=0, Total=272 [2021-11-12 22:52:37,595 INFO L87 Difference]: Start difference. First operand 54 states and 63 transitions. Second operand has 17 states, 17 states have (on average 3.411764705882353) internal successors, (58), 17 states have internal predecessors, (58), 6 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-12 22:52:38,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:52:38,527 INFO L93 Difference]: Finished difference Result 240 states and 284 transitions. [2021-11-12 22:52:38,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-12 22:52:38,530 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.411764705882353) internal successors, (58), 17 states have internal predecessors, (58), 6 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 34 [2021-11-12 22:52:38,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:52:38,533 INFO L225 Difference]: With dead ends: 240 [2021-11-12 22:52:38,534 INFO L226 Difference]: Without dead ends: 231 [2021-11-12 22:52:38,535 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 186 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=171, Invalid=381, Unknown=0, NotChecked=0, Total=552 [2021-11-12 22:52:38,536 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 250 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 535.41ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 250 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.98ms SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 633.89ms IncrementalHoareTripleChecker+Time [2021-11-12 22:52:38,536 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [250 Valid, 299 Invalid, 257 Unknown, 0 Unchecked, 4.98ms Time], IncrementalHoareTripleChecker [120 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 633.89ms Time] [2021-11-12 22:52:38,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2021-11-12 22:52:38,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 215. [2021-11-12 22:52:38,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 166 states have (on average 1.2289156626506024) internal successors, (204), 174 states have internal predecessors, (204), 27 states have call successors, (27), 22 states have call predecessors, (27), 21 states have return successors, (22), 18 states have call predecessors, (22), 22 states have call successors, (22) [2021-11-12 22:52:38,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 253 transitions. [2021-11-12 22:52:38,578 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 253 transitions. Word has length 34 [2021-11-12 22:52:38,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:52:38,578 INFO L470 AbstractCegarLoop]: Abstraction has 215 states and 253 transitions. [2021-11-12 22:52:38,579 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 3.411764705882353) internal successors, (58), 17 states have internal predecessors, (58), 6 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-12 22:52:38,579 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 253 transitions. [2021-11-12 22:52:38,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-12 22:52:38,581 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:52:38,581 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:52:38,590 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2021-11-12 22:52:38,793 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-12 22:52:39,010 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2021-11-12 22:52:39,184 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:52:39,184 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:52:39,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:52:39,185 INFO L85 PathProgramCache]: Analyzing trace with hash -1153752708, now seen corresponding path program 1 times [2021-11-12 22:52:39,185 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:52:39,185 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1028887510] [2021-11-12 22:52:39,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:39,186 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:52:39,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:52:39,187 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:52:39,188 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-12 22:52:39,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:39,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:52:39,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:39,678 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:52:39,678 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:40,195 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:52:40,196 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:52:40,196 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1028887510] [2021-11-12 22:52:40,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1028887510] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:52:40,196 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [140412908] [2021-11-12 22:52:40,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:40,196 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:52:40,197 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:52:40,198 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:52:40,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (14)] Waiting until timeout for monitored process [2021-11-12 22:52:40,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:40,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:52:40,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:40,398 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:52:40,399 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:40,747 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:52:40,747 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [140412908] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:52:40,747 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [139281656] [2021-11-12 22:52:40,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:40,748 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:52:40,748 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:52:40,750 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:52:40,751 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-12 22:52:40,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:40,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:52:40,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:40,955 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:52:40,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:41,335 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:52:41,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [139281656] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:52:41,336 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:52:41,336 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 7, 6, 7, 6] total 9 [2021-11-12 22:52:41,336 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548407183] [2021-11-12 22:52:41,337 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:52:41,337 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-12 22:52:41,337 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:52:41,339 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-12 22:52:41,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-11-12 22:52:41,339 INFO L87 Difference]: Start difference. First operand 215 states and 253 transitions. Second operand has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-12 22:52:41,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:52:41,869 INFO L93 Difference]: Finished difference Result 234 states and 271 transitions. [2021-11-12 22:52:41,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-12 22:52:41,872 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 40 [2021-11-12 22:52:41,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:52:41,874 INFO L225 Difference]: With dead ends: 234 [2021-11-12 22:52:41,874 INFO L226 Difference]: Without dead ends: 209 [2021-11-12 22:52:41,874 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 227 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2021-11-12 22:52:41,875 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 12 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 415.44ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.39ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 457.25ms IncrementalHoareTripleChecker+Time [2021-11-12 22:52:41,875 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 147 Invalid, 57 Unknown, 0 Unchecked, 1.39ms Time], IncrementalHoareTripleChecker [3 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 457.25ms Time] [2021-11-12 22:52:41,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-11-12 22:52:41,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 209. [2021-11-12 22:52:41,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 164 states have (on average 1.201219512195122) internal successors, (197), 169 states have internal predecessors, (197), 23 states have call successors, (23), 21 states have call predecessors, (23), 21 states have return successors, (22), 18 states have call predecessors, (22), 22 states have call successors, (22) [2021-11-12 22:52:41,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 242 transitions. [2021-11-12 22:52:41,902 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 242 transitions. Word has length 40 [2021-11-12 22:52:41,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:52:41,903 INFO L470 AbstractCegarLoop]: Abstraction has 209 states and 242 transitions. [2021-11-12 22:52:41,903 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-12 22:52:41,903 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 242 transitions. [2021-11-12 22:52:41,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-12 22:52:41,906 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:52:41,906 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:52:41,917 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (14)] Forceful destruction successful, exit code 0 [2021-11-12 22:52:42,117 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-12 22:52:42,334 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-12 22:52:42,507 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:52:42,508 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:52:42,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:52:42,509 INFO L85 PathProgramCache]: Analyzing trace with hash 886516180, now seen corresponding path program 2 times [2021-11-12 22:52:42,509 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:52:42,509 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1549354651] [2021-11-12 22:52:42,509 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:52:42,510 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:52:42,510 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:52:42,511 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:52:42,514 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-12 22:52:42,620 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:52:42,620 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:52:42,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-12 22:52:42,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:42,905 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 11 proven. 10 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-12 22:52:42,905 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:43,221 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 11 proven. 10 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-12 22:52:43,221 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:52:43,221 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1549354651] [2021-11-12 22:52:43,221 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1549354651] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:52:43,221 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [387660530] [2021-11-12 22:52:43,221 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:52:43,222 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:52:43,222 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:52:43,227 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:52:43,254 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-12 22:52:43,453 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:52:43,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:52:43,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-12 22:52:43,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:43,652 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 11 proven. 10 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-12 22:52:43,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:43,824 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 11 proven. 10 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-12 22:52:43,824 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [387660530] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:52:43,824 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1315314020] [2021-11-12 22:52:43,824 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:52:43,824 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:52:43,825 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:52:43,827 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:52:43,838 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-12 22:52:43,930 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:52:43,931 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:52:43,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-12 22:52:43,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:44,123 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 11 proven. 10 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-12 22:52:44,123 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:44,287 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 11 proven. 10 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-12 22:52:44,287 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1315314020] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:52:44,287 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:52:44,287 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 7, 8, 7, 8] total 12 [2021-11-12 22:52:44,288 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779479592] [2021-11-12 22:52:44,288 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:52:44,289 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-12 22:52:44,289 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:52:44,289 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-12 22:52:44,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:52:44,290 INFO L87 Difference]: Start difference. First operand 209 states and 242 transitions. Second operand has 12 states, 12 states have (on average 3.9166666666666665) internal successors, (47), 10 states have internal predecessors, (47), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 6 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-12 22:52:44,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:52:44,482 INFO L93 Difference]: Finished difference Result 279 states and 323 transitions. [2021-11-12 22:52:44,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-12 22:52:44,485 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.9166666666666665) internal successors, (47), 10 states have internal predecessors, (47), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 6 states have call predecessors, (8), 7 states have call successors, (8) Word has length 43 [2021-11-12 22:52:44,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:52:44,487 INFO L225 Difference]: With dead ends: 279 [2021-11-12 22:52:44,487 INFO L226 Difference]: Without dead ends: 175 [2021-11-12 22:52:44,488 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 239 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-11-12 22:52:44,489 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 31 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 144.69ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.35ms SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 162.85ms IncrementalHoareTripleChecker+Time [2021-11-12 22:52:44,489 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 135 Invalid, 70 Unknown, 0 Unchecked, 1.35ms Time], IncrementalHoareTripleChecker [8 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 162.85ms Time] [2021-11-12 22:52:44,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2021-11-12 22:52:44,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 175. [2021-11-12 22:52:44,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 138 states have (on average 1.2028985507246377) internal successors, (166), 142 states have internal predecessors, (166), 19 states have call successors, (19), 17 states have call predecessors, (19), 17 states have return successors, (18), 15 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-12 22:52:44,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 203 transitions. [2021-11-12 22:52:44,523 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 203 transitions. Word has length 43 [2021-11-12 22:52:44,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:52:44,523 INFO L470 AbstractCegarLoop]: Abstraction has 175 states and 203 transitions. [2021-11-12 22:52:44,524 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.9166666666666665) internal successors, (47), 10 states have internal predecessors, (47), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 6 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-12 22:52:44,524 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 203 transitions. [2021-11-12 22:52:44,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-12 22:52:44,526 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:52:44,526 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:52:44,535 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-12 22:52:44,757 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-12 22:52:44,939 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (16)] Ended with exit code 0 [2021-11-12 22:52:45,132 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:52:45,132 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:52:45,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:52:45,133 INFO L85 PathProgramCache]: Analyzing trace with hash -671468391, now seen corresponding path program 1 times [2021-11-12 22:52:45,133 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:52:45,133 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1145642582] [2021-11-12 22:52:45,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:45,133 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:52:45,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:52:45,134 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:52:45,135 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-12 22:52:45,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:45,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-12 22:52:45,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:45,326 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-12 22:52:45,326 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:45,507 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-12 22:52:45,507 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:52:45,508 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1145642582] [2021-11-12 22:52:45,508 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1145642582] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:52:45,508 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1560135077] [2021-11-12 22:52:45,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:45,508 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:52:45,508 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:52:45,515 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:52:45,522 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2021-11-12 22:52:45,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:45,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-12 22:52:45,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:45,755 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-12 22:52:45,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:45,856 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-12 22:52:45,856 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1560135077] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:52:45,856 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [116806193] [2021-11-12 22:52:45,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:52:45,856 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:52:45,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:52:45,857 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:52:45,858 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-12 22:52:45,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:52:45,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-12 22:52:45,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:46,026 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-12 22:52:46,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:52:46,120 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-12 22:52:46,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [116806193] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:52:46,121 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:52:46,121 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 5, 6, 5, 6] total 10 [2021-11-12 22:52:46,122 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1279785096] [2021-11-12 22:52:46,123 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:52:46,123 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-12 22:52:46,123 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:52:46,124 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-12 22:52:46,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-12 22:52:46,124 INFO L87 Difference]: Start difference. First operand 175 states and 203 transitions. Second operand has 10 states, 10 states have (on average 4.0) internal successors, (40), 10 states have internal predecessors, (40), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-12 22:52:46,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:52:46,358 INFO L93 Difference]: Finished difference Result 309 states and 352 transitions. [2021-11-12 22:52:46,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-12 22:52:46,359 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.0) internal successors, (40), 10 states have internal predecessors, (40), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 45 [2021-11-12 22:52:46,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:52:46,360 INFO L225 Difference]: With dead ends: 309 [2021-11-12 22:52:46,360 INFO L226 Difference]: Without dead ends: 175 [2021-11-12 22:52:46,362 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 257 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=87, Invalid=185, Unknown=0, NotChecked=0, Total=272 [2021-11-12 22:52:46,363 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 45 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 106.10ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.34ms SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 124.45ms IncrementalHoareTripleChecker+Time [2021-11-12 22:52:46,363 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 132 Invalid, 83 Unknown, 0 Unchecked, 1.34ms Time], IncrementalHoareTripleChecker [25 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 124.45ms Time] [2021-11-12 22:52:46,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2021-11-12 22:52:46,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 175. [2021-11-12 22:52:46,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 138 states have (on average 1.173913043478261) internal successors, (162), 142 states have internal predecessors, (162), 19 states have call successors, (19), 17 states have call predecessors, (19), 17 states have return successors, (18), 15 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-12 22:52:46,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 199 transitions. [2021-11-12 22:52:46,377 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 199 transitions. Word has length 45 [2021-11-12 22:52:46,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:52:46,378 INFO L470 AbstractCegarLoop]: Abstraction has 175 states and 199 transitions. [2021-11-12 22:52:46,378 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 4.0) internal successors, (40), 10 states have internal predecessors, (40), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-12 22:52:46,378 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 199 transitions. [2021-11-12 22:52:46,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-12 22:52:46,380 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:52:46,380 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:52:46,390 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-12 22:52:46,608 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-12 22:52:46,790 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (20)] Forceful destruction successful, exit code 0 [2021-11-12 22:52:46,987 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:52:46,987 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:52:46,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:52:46,987 INFO L85 PathProgramCache]: Analyzing trace with hash -2006317561, now seen corresponding path program 3 times [2021-11-12 22:52:46,988 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:52:46,988 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [919652271] [2021-11-12 22:52:46,988 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:52:46,988 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:52:46,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:52:46,993 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:52:46,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-12 22:52:48,040 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-12 22:52:48,041 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:52:48,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-12 22:52:48,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:52:50,179 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-12 22:52:50,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:53:06,389 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 12 proven. 15 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-12 22:53:06,389 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:53:06,389 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [919652271] [2021-11-12 22:53:06,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [919652271] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:53:06,390 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1759517908] [2021-11-12 22:53:06,390 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:53:06,390 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:53:06,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:53:06,391 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:53:06,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2021-11-12 22:53:07,706 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-12 22:53:07,706 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:53:07,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-12 22:53:07,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:53:09,028 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-12 22:53:09,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:53:39,285 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 12 proven. 15 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-12 22:53:39,286 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1759517908] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:53:39,286 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [249609478] [2021-11-12 22:53:39,286 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:53:39,286 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:53:39,286 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:53:39,292 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:53:39,293 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-12 22:54:38,461 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-12 22:54:38,461 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:54:38,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-12 22:54:38,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:54:59,975 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-12 22:54:59,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:55:04,045 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 12 proven. 15 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-12 22:55:04,045 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [249609478] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:55:04,045 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:55:04,046 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 14, 13, 14, 13] total 34 [2021-11-12 22:55:04,046 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618342530] [2021-11-12 22:55:04,046 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:55:04,046 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-12 22:55:04,047 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:55:04,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-12 22:55:04,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=883, Unknown=20, NotChecked=0, Total=1122 [2021-11-12 22:55:04,048 INFO L87 Difference]: Start difference. First operand 175 states and 199 transitions. Second operand has 34 states, 34 states have (on average 2.5294117647058822) internal successors, (86), 32 states have internal predecessors, (86), 11 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-12 22:55:16,540 WARN L227 SmtUtils]: Spent 6.05s on a formula simplification that was a NOOP. DAG size: 37 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-12 22:55:49,826 WARN L227 SmtUtils]: Spent 32.44s on a formula simplification. DAG size of input: 40 DAG size of output: 39 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-12 22:56:25,196 WARN L227 SmtUtils]: Spent 32.51s on a formula simplification. DAG size of input: 36 DAG size of output: 35 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-12 22:56:28,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:56:28,685 INFO L93 Difference]: Finished difference Result 226 states and 263 transitions. [2021-11-12 22:56:28,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-12 22:56:28,688 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.5294117647058822) internal successors, (86), 32 states have internal predecessors, (86), 11 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) Word has length 46 [2021-11-12 22:56:28,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:56:28,690 INFO L225 Difference]: With dead ends: 226 [2021-11-12 22:56:28,690 INFO L226 Difference]: Without dead ends: 221 [2021-11-12 22:56:28,692 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 238 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 513 ImplicationChecksByTransitivity, 140.4s TimeCoverageRelationStatistics Valid=292, Invalid=1246, Unknown=22, NotChecked=0, Total=1560 [2021-11-12 22:56:28,692 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 90 mSDsluCounter, 463 mSDsCounter, 0 mSdLazyCounter, 133 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3197.74ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 498 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.85ms SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 71 IncrementalHoareTripleChecker+Unchecked, 3373.25ms IncrementalHoareTripleChecker+Time [2021-11-12 22:56:28,693 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 498 Invalid, 215 Unknown, 0 Unchecked, 3.85ms Time], IncrementalHoareTripleChecker [11 Valid, 133 Invalid, 0 Unknown, 71 Unchecked, 3373.25ms Time] [2021-11-12 22:56:28,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2021-11-12 22:56:28,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 210. [2021-11-12 22:56:28,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 165 states have (on average 1.1696969696969697) internal successors, (193), 170 states have internal predecessors, (193), 24 states have call successors, (24), 20 states have call predecessors, (24), 20 states have return successors, (23), 19 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-12 22:56:28,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 240 transitions. [2021-11-12 22:56:28,721 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 240 transitions. Word has length 46 [2021-11-12 22:56:28,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:56:28,722 INFO L470 AbstractCegarLoop]: Abstraction has 210 states and 240 transitions. [2021-11-12 22:56:28,722 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.5294117647058822) internal successors, (86), 32 states have internal predecessors, (86), 11 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-12 22:56:28,722 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 240 transitions. [2021-11-12 22:56:28,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-12 22:56:28,724 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:56:28,724 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:56:28,756 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-12 22:56:28,928 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (23)] Forceful destruction successful, exit code 0 [2021-11-12 22:56:29,136 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-12 22:56:29,325 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:56:29,325 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:56:29,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:56:29,326 INFO L85 PathProgramCache]: Analyzing trace with hash -231310199, now seen corresponding path program 1 times [2021-11-12 22:56:29,326 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:56:29,326 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [432789102] [2021-11-12 22:56:29,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:56:29,326 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:56:29,326 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:56:29,327 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:56:29,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-12 22:56:29,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:56:29,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-12 22:56:29,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:56:37,791 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 12 proven. 12 refuted. 3 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-12 22:56:37,791 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:56:50,071 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 12 proven. 15 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-12 22:56:50,072 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:56:50,072 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [432789102] [2021-11-12 22:56:50,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [432789102] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:56:50,072 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1646436743] [2021-11-12 22:56:50,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:56:50,072 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:56:50,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:56:50,073 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:56:50,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-12 22:56:50,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:56:50,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-12 22:56:50,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:56:53,394 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 11 refuted. 3 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-12 22:56:53,394 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:57:01,550 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-12 22:57:01,551 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1646436743] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:57:01,551 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1409437984] [2021-11-12 22:57:01,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:57:01,551 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:57:01,551 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:57:01,552 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:57:01,553 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-12 22:57:01,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:57:01,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-12 22:57:01,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:57:02,673 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 12 proven. 15 refuted. 3 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:57:02,673 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:57:19,086 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 12 proven. 15 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-12 22:57:19,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1409437984] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:57:19,086 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:57:19,086 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 10, 10, 15, 12] total 36 [2021-11-12 22:57:19,086 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1280736162] [2021-11-12 22:57:19,087 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:57:19,087 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-12 22:57:19,087 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:57:19,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-12 22:57:19,089 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=1047, Unknown=10, NotChecked=0, Total=1260 [2021-11-12 22:57:19,089 INFO L87 Difference]: Start difference. First operand 210 states and 240 transitions. Second operand has 36 states, 36 states have (on average 2.8333333333333335) internal successors, (102), 34 states have internal predecessors, (102), 13 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (13), 10 states have call predecessors, (13), 10 states have call successors, (13) [2021-11-12 22:57:31,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:57:31,657 INFO L93 Difference]: Finished difference Result 254 states and 290 transitions. [2021-11-12 22:57:31,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-12 22:57:31,660 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.8333333333333335) internal successors, (102), 34 states have internal predecessors, (102), 13 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (13), 10 states have call predecessors, (13), 10 states have call successors, (13) Word has length 46 [2021-11-12 22:57:31,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:57:31,662 INFO L225 Difference]: With dead ends: 254 [2021-11-12 22:57:31,662 INFO L226 Difference]: Without dead ends: 252 [2021-11-12 22:57:31,663 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 234 SyntacticMatches, 3 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 548 ImplicationChecksByTransitivity, 47.0s TimeCoverageRelationStatistics Valid=242, Invalid=1306, Unknown=12, NotChecked=0, Total=1560 [2021-11-12 22:57:31,663 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 111 mSDsluCounter, 473 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3320.21ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 506 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.78ms SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 55 IncrementalHoareTripleChecker+Unchecked, 3586.71ms IncrementalHoareTripleChecker+Time [2021-11-12 22:57:31,664 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [112 Valid, 506 Invalid, 271 Unknown, 0 Unchecked, 3.78ms Time], IncrementalHoareTripleChecker [7 Valid, 209 Invalid, 0 Unknown, 55 Unchecked, 3586.71ms Time] [2021-11-12 22:57:31,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2021-11-12 22:57:31,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 210. [2021-11-12 22:57:31,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 165 states have (on average 1.1696969696969697) internal successors, (193), 170 states have internal predecessors, (193), 24 states have call successors, (24), 20 states have call predecessors, (24), 20 states have return successors, (23), 19 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-12 22:57:31,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 240 transitions. [2021-11-12 22:57:31,688 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 240 transitions. Word has length 46 [2021-11-12 22:57:31,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:57:31,689 INFO L470 AbstractCegarLoop]: Abstraction has 210 states and 240 transitions. [2021-11-12 22:57:31,689 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.8333333333333335) internal successors, (102), 34 states have internal predecessors, (102), 13 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (13), 10 states have call predecessors, (13), 10 states have call successors, (13) [2021-11-12 22:57:31,689 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 240 transitions. [2021-11-12 22:57:31,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-12 22:57:31,690 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:57:31,690 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:57:31,698 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-12 22:57:31,915 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-12 22:57:32,096 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-12 22:57:32,295 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:57:32,295 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:57:32,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:57:32,295 INFO L85 PathProgramCache]: Analyzing trace with hash 1267581381, now seen corresponding path program 2 times [2021-11-12 22:57:32,296 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:57:32,296 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1958790018] [2021-11-12 22:57:32,296 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:57:32,296 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:57:32,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:57:32,297 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:57:32,299 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-12 22:57:32,374 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:57:32,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:57:32,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:57:32,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:57:32,727 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-12 22:57:32,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:57:32,869 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-12 22:57:32,869 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:57:32,869 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1958790018] [2021-11-12 22:57:32,869 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1958790018] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:57:32,870 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:57:32,870 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 4] imperfect sequences [] total 8 [2021-11-12 22:57:32,870 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1624146373] [2021-11-12 22:57:32,870 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:57:32,870 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-12 22:57:32,870 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:57:32,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-12 22:57:32,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-12 22:57:32,871 INFO L87 Difference]: Start difference. First operand 210 states and 240 transitions. Second operand has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-12 22:57:32,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:57:32,935 INFO L93 Difference]: Finished difference Result 235 states and 270 transitions. [2021-11-12 22:57:32,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-12 22:57:32,936 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 46 [2021-11-12 22:57:32,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:57:32,937 INFO L225 Difference]: With dead ends: 235 [2021-11-12 22:57:32,938 INFO L226 Difference]: Without dead ends: 167 [2021-11-12 22:57:32,938 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2021-11-12 22:57:32,939 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 10 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.35ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.48ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 18 IncrementalHoareTripleChecker+Unchecked, 8.36ms IncrementalHoareTripleChecker+Time [2021-11-12 22:57:32,939 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 133 Invalid, 25 Unknown, 0 Unchecked, 0.48ms Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 18 Unchecked, 8.36ms Time] [2021-11-12 22:57:32,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-11-12 22:57:32,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 167. [2021-11-12 22:57:32,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 132 states have (on average 1.1363636363636365) internal successors, (150), 136 states have internal predecessors, (150), 19 states have call successors, (19), 15 states have call predecessors, (19), 15 states have return successors, (18), 15 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-12 22:57:32,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 187 transitions. [2021-11-12 22:57:32,958 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 187 transitions. Word has length 46 [2021-11-12 22:57:32,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:57:32,959 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 187 transitions. [2021-11-12 22:57:32,959 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-12 22:57:32,959 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 187 transitions. [2021-11-12 22:57:32,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-12 22:57:32,961 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:57:32,961 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:57:32,972 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-12 22:57:33,170 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:57:33,171 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:57:33,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:57:33,171 INFO L85 PathProgramCache]: Analyzing trace with hash 272650529, now seen corresponding path program 4 times [2021-11-12 22:57:33,171 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:57:33,171 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1938753091] [2021-11-12 22:57:33,171 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:57:33,172 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:57:33,172 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:57:33,172 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:57:33,174 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-12 22:57:33,282 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:57:33,282 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:57:33,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-12 22:57:33,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:57:33,704 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 17 proven. 25 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-12 22:57:33,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:57:34,136 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 17 proven. 25 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-12 22:57:34,136 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:57:34,136 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1938753091] [2021-11-12 22:57:34,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1938753091] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:57:34,136 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1156826710] [2021-11-12 22:57:34,136 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:57:34,137 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:57:34,137 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:57:34,137 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:57:34,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-12 22:57:34,296 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:57:34,296 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:57:34,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-12 22:57:34,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:57:35,199 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 17 proven. 25 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-12 22:57:35,199 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:57:35,885 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 17 proven. 25 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-12 22:57:35,886 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1156826710] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:57:35,886 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1701182581] [2021-11-12 22:57:35,886 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:57:35,886 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:57:35,886 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:57:35,895 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:57:35,899 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-12 22:57:36,509 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:57:36,509 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:57:36,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-12 22:57:36,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:57:36,846 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 17 proven. 25 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-12 22:57:36,846 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:57:37,118 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 17 proven. 25 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-12 22:57:37,118 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1701182581] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:57:37,118 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:57:37,119 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 13, 11, 11, 11] total 26 [2021-11-12 22:57:37,119 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739117531] [2021-11-12 22:57:37,119 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:57:37,120 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-12 22:57:37,120 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:57:37,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-12 22:57:37,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=522, Unknown=0, NotChecked=0, Total=650 [2021-11-12 22:57:37,121 INFO L87 Difference]: Start difference. First operand 167 states and 187 transitions. Second operand has 26 states, 26 states have (on average 3.076923076923077) internal successors, (80), 24 states have internal predecessors, (80), 13 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (13), 11 states have call predecessors, (13), 12 states have call successors, (13) [2021-11-12 22:57:39,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:57:39,841 INFO L93 Difference]: Finished difference Result 199 states and 227 transitions. [2021-11-12 22:57:39,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-12 22:57:39,845 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.076923076923077) internal successors, (80), 24 states have internal predecessors, (80), 13 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (13), 11 states have call predecessors, (13), 12 states have call successors, (13) Word has length 55 [2021-11-12 22:57:39,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:57:39,846 INFO L225 Difference]: With dead ends: 199 [2021-11-12 22:57:39,847 INFO L226 Difference]: Without dead ends: 149 [2021-11-12 22:57:39,847 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 300 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 224 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=157, Invalid=655, Unknown=0, NotChecked=0, Total=812 [2021-11-12 22:57:39,848 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 68 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2069.24ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.24ms SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2116.87ms IncrementalHoareTripleChecker+Time [2021-11-12 22:57:39,848 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 294 Invalid, 200 Unknown, 0 Unchecked, 2.24ms Time], IncrementalHoareTripleChecker [47 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 2116.87ms Time] [2021-11-12 22:57:39,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-11-12 22:57:39,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 133. [2021-11-12 22:57:39,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 106 states have (on average 1.1320754716981132) internal successors, (120), 109 states have internal predecessors, (120), 15 states have call successors, (15), 11 states have call predecessors, (15), 11 states have return successors, (14), 12 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-12 22:57:39,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 149 transitions. [2021-11-12 22:57:39,861 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 149 transitions. Word has length 55 [2021-11-12 22:57:39,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:57:39,862 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 149 transitions. [2021-11-12 22:57:39,862 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 3.076923076923077) internal successors, (80), 24 states have internal predecessors, (80), 13 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (13), 11 states have call predecessors, (13), 12 states have call successors, (13) [2021-11-12 22:57:39,862 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 149 transitions. [2021-11-12 22:57:39,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-12 22:57:39,863 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:57:39,863 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:57:39,874 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-12 22:57:40,073 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-12 22:57:40,293 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-12 22:57:40,471 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:57:40,471 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:57:40,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:57:40,471 INFO L85 PathProgramCache]: Analyzing trace with hash -1292408368, now seen corresponding path program 2 times [2021-11-12 22:57:40,472 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:57:40,472 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [741511764] [2021-11-12 22:57:40,472 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:57:40,472 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:57:40,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:57:40,473 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:57:40,473 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-12 22:57:40,540 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:57:40,540 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:57:40,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-12 22:57:40,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:57:40,764 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 4 proven. 58 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:57:40,764 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:57:41,142 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 4 proven. 54 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-12 22:57:41,142 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:57:41,142 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [741511764] [2021-11-12 22:57:41,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [741511764] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:57:41,143 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [884220789] [2021-11-12 22:57:41,143 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:57:41,143 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:57:41,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:57:41,144 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:57:41,146 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2021-11-12 22:57:41,271 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:57:41,271 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:57:41,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-12 22:57:41,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:57:41,399 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 4 proven. 58 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:57:41,399 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:57:41,527 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 4 proven. 54 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-12 22:57:41,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [884220789] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:57:41,527 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [4767897] [2021-11-12 22:57:41,527 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:57:41,528 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:57:41,528 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:57:41,528 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:57:41,529 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-12 22:57:41,587 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:57:41,587 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:57:41,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-12 22:57:41,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:57:41,717 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 4 proven. 58 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:57:41,717 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:57:41,856 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 4 proven. 54 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-12 22:57:41,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [4767897] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:57:41,857 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:57:41,857 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 11, 12, 11, 12] total 22 [2021-11-12 22:57:41,857 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777818966] [2021-11-12 22:57:41,857 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:57:41,858 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-12 22:57:41,858 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:57:41,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-12 22:57:41,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=339, Unknown=0, NotChecked=0, Total=462 [2021-11-12 22:57:41,859 INFO L87 Difference]: Start difference. First operand 133 states and 149 transitions. Second operand has 22 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 22 states have internal predecessors, (80), 7 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-12 22:57:44,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:57:44,100 INFO L93 Difference]: Finished difference Result 659 states and 764 transitions. [2021-11-12 22:57:44,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-12 22:57:44,100 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 22 states have internal predecessors, (80), 7 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 55 [2021-11-12 22:57:44,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:57:44,105 INFO L225 Difference]: With dead ends: 659 [2021-11-12 22:57:44,105 INFO L226 Difference]: Without dead ends: 652 [2021-11-12 22:57:44,106 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 353 GetRequests, 312 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=544, Invalid=1262, Unknown=0, NotChecked=0, Total=1806 [2021-11-12 22:57:44,107 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 749 mSDsluCounter, 714 mSDsCounter, 0 mSdLazyCounter, 409 mSolverCounterSat, 293 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 856.59ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 749 SdHoareTripleChecker+Valid, 792 SdHoareTripleChecker+Invalid, 702 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.92ms SdHoareTripleChecker+Time, 293 IncrementalHoareTripleChecker+Valid, 409 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1034.16ms IncrementalHoareTripleChecker+Time [2021-11-12 22:57:44,109 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [749 Valid, 792 Invalid, 702 Unknown, 0 Unchecked, 6.92ms Time], IncrementalHoareTripleChecker [293 Valid, 409 Invalid, 0 Unknown, 0 Unchecked, 1034.16ms Time] [2021-11-12 22:57:44,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 652 states. [2021-11-12 22:57:44,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 652 to 493. [2021-11-12 22:57:44,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 493 states, 388 states have (on average 1.1597938144329898) internal successors, (450), 400 states have internal predecessors, (450), 54 states have call successors, (54), 50 states have call predecessors, (54), 50 states have return successors, (53), 42 states have call predecessors, (53), 53 states have call successors, (53) [2021-11-12 22:57:44,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 493 states to 493 states and 557 transitions. [2021-11-12 22:57:44,174 INFO L78 Accepts]: Start accepts. Automaton has 493 states and 557 transitions. Word has length 55 [2021-11-12 22:57:44,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:57:44,175 INFO L470 AbstractCegarLoop]: Abstraction has 493 states and 557 transitions. [2021-11-12 22:57:44,175 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 22 states have internal predecessors, (80), 7 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-12 22:57:44,175 INFO L276 IsEmpty]: Start isEmpty. Operand 493 states and 557 transitions. [2021-11-12 22:57:44,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-12 22:57:44,176 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:57:44,177 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:57:44,186 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (33)] Forceful destruction successful, exit code 0 [2021-11-12 22:57:44,386 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (32)] Ended with exit code 0 [2021-11-12 22:57:44,600 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-12 22:57:44,779 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:57:44,779 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:57:44,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:57:44,780 INFO L85 PathProgramCache]: Analyzing trace with hash -1232897836, now seen corresponding path program 5 times [2021-11-12 22:57:44,780 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:57:44,780 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1426487560] [2021-11-12 22:57:44,780 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-12 22:57:44,780 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:57:44,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:57:44,781 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:57:44,782 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-12 22:57:55,717 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-12 22:57:55,717 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:57:55,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-12 22:57:55,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:58:11,126 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 22 proven. 26 refuted. 6 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-12 22:58:11,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:58:56,294 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 19 proven. 35 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-12 22:58:56,294 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:58:56,295 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1426487560] [2021-11-12 22:58:56,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1426487560] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:58:56,295 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [600182116] [2021-11-12 22:58:56,295 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-12 22:58:56,295 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:58:56,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:58:56,296 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:58:56,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-12 22:59:04,685 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-12 22:59:04,685 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:59:04,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-12 22:59:04,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:59:46,455 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 22 proven. 26 refuted. 6 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-12 22:59:46,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:01:13,554 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 19 proven. 35 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-12 23:01:13,554 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [600182116] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:01:13,554 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1259263694] [2021-11-12 23:01:13,554 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-12 23:01:13,555 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:01:13,555 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:01:13,556 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:01:13,556 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d54ba9a-91f2-463e-bf77-c82675307e25/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-12 23:01:19,369 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-12 23:01:19,369 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 23:01:19,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-12 23:01:19,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:01:50,033 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 3 proven. 48 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-12 23:01:50,033 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:03:37,764 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 12 proven. 36 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-12 23:03:37,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1259263694] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:03:37,764 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 23:03:37,765 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 20, 18] total 66 [2021-11-12 23:03:37,765 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1866177850] [2021-11-12 23:03:37,765 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 23:03:37,766 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-11-12 23:03:37,766 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:03:37,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-11-12 23:03:37,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=633, Invalid=3578, Unknown=79, NotChecked=0, Total=4290 [2021-11-12 23:03:37,768 INFO L87 Difference]: Start difference. First operand 493 states and 557 transitions. Second operand has 66 states, 66 states have (on average 2.242424242424242) internal successors, (148), 58 states have internal predecessors, (148), 21 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (19), 17 states have call predecessors, (19), 17 states have call successors, (19) [2021-11-12 23:05:33,611 WARN L227 SmtUtils]: Spent 1.31m on a formula simplification. DAG size of input: 72 DAG size of output: 70 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-12 23:05:37,341 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-12 23:05:39,347 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-12 23:05:41,509 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-12 23:05:43,553 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.55s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers []