./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench/egcd2-ll.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version b5237d83 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench/egcd2-ll.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba --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 ed6536c9cb0e4b2be9a327fc4a25c6bfba6e98b1dfb78e314dd25bca8cbdb087 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-b5237d8 [2022-11-22 02:48:12,063 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-22 02:48:12,065 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-22 02:48:12,084 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-22 02:48:12,085 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-22 02:48:12,086 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-22 02:48:12,087 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-22 02:48:12,089 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-22 02:48:12,091 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-22 02:48:12,092 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-22 02:48:12,093 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-22 02:48:12,098 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-22 02:48:12,098 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-22 02:48:12,106 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-22 02:48:12,107 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-22 02:48:12,109 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-22 02:48:12,109 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-22 02:48:12,110 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-22 02:48:12,112 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-22 02:48:12,124 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-22 02:48:12,126 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-22 02:48:12,131 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-22 02:48:12,132 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-22 02:48:12,133 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-22 02:48:12,137 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-22 02:48:12,137 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-22 02:48:12,137 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-22 02:48:12,138 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-22 02:48:12,139 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-22 02:48:12,140 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-22 02:48:12,140 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-22 02:48:12,141 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-22 02:48:12,142 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-22 02:48:12,149 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-22 02:48:12,153 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-22 02:48:12,153 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-22 02:48:12,154 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-22 02:48:12,154 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-22 02:48:12,155 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-22 02:48:12,158 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-22 02:48:12,159 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-22 02:48:12,160 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-22 02:48:12,214 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-22 02:48:12,215 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-22 02:48:12,215 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-22 02:48:12,215 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-22 02:48:12,216 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-22 02:48:12,216 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-22 02:48:12,216 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-22 02:48:12,217 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-22 02:48:12,217 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-22 02:48:12,217 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-22 02:48:12,217 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-22 02:48:12,218 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-22 02:48:12,218 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-22 02:48:12,218 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-22 02:48:12,218 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-22 02:48:12,218 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-22 02:48:12,219 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-22 02:48:12,219 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-22 02:48:12,220 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-22 02:48:12,220 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-22 02:48:12,220 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-22 02:48:12,220 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-22 02:48:12,220 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-22 02:48:12,221 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-22 02:48:12,221 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-22 02:48:12,221 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-22 02:48:12,221 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-22 02:48:12,221 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-22 02:48:12,222 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-22 02:48:12,222 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-22 02:48:12,222 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-22 02:48:12,224 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-22 02:48:12,224 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 02:48:12,225 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-22 02:48:12,225 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-22 02:48:12,225 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-22 02:48:12,226 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-22 02:48:12,226 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-22 02:48:12,227 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-22 02:48:12,227 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-22 02:48:12,227 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-22 02:48:12,227 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ed6536c9cb0e4b2be9a327fc4a25c6bfba6e98b1dfb78e314dd25bca8cbdb087 [2022-11-22 02:48:12,473 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-22 02:48:12,500 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-22 02:48:12,502 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-22 02:48:12,503 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-22 02:48:12,504 INFO L275 PluginConnector]: CDTParser initialized [2022-11-22 02:48:12,505 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/../../sv-benchmarks/c/nla-digbench/egcd2-ll.c [2022-11-22 02:48:15,515 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-22 02:48:15,801 INFO L351 CDTParser]: Found 1 translation units. [2022-11-22 02:48:15,802 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/sv-benchmarks/c/nla-digbench/egcd2-ll.c [2022-11-22 02:48:15,808 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/data/b996363fe/be85adc146dd4b08b12238a51c8f2107/FLAG01cee62a7 [2022-11-22 02:48:15,823 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/data/b996363fe/be85adc146dd4b08b12238a51c8f2107 [2022-11-22 02:48:15,825 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-22 02:48:15,827 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-22 02:48:15,828 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-22 02:48:15,828 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-22 02:48:15,832 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-22 02:48:15,833 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 02:48:15" (1/1) ... [2022-11-22 02:48:15,834 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2e31508e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:48:15, skipping insertion in model container [2022-11-22 02:48:15,834 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 02:48:15" (1/1) ... [2022-11-22 02:48:15,841 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-22 02:48:15,857 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-22 02:48:16,001 WARN L237 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_e8fdde1d-e94e-4379-b38c-677aa9391d71/sv-benchmarks/c/nla-digbench/egcd2-ll.c[490,503] [2022-11-22 02:48:16,025 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 02:48:16,038 INFO L203 MainTranslator]: Completed pre-run [2022-11-22 02:48:16,052 WARN L237 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_e8fdde1d-e94e-4379-b38c-677aa9391d71/sv-benchmarks/c/nla-digbench/egcd2-ll.c[490,503] [2022-11-22 02:48:16,081 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 02:48:16,097 INFO L208 MainTranslator]: Completed translation [2022-11-22 02:48:16,098 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:48:16 WrapperNode [2022-11-22 02:48:16,098 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-22 02:48:16,100 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-22 02:48:16,100 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-22 02:48:16,100 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-22 02:48:16,108 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:48:16" (1/1) ... [2022-11-22 02:48:16,124 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:48:16" (1/1) ... [2022-11-22 02:48:16,151 INFO L138 Inliner]: procedures = 14, calls = 17, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 75 [2022-11-22 02:48:16,151 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-22 02:48:16,152 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-22 02:48:16,152 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-22 02:48:16,152 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-22 02:48:16,161 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:48:16" (1/1) ... [2022-11-22 02:48:16,161 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:48:16" (1/1) ... [2022-11-22 02:48:16,163 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:48:16" (1/1) ... [2022-11-22 02:48:16,163 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:48:16" (1/1) ... [2022-11-22 02:48:16,166 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:48:16" (1/1) ... [2022-11-22 02:48:16,170 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:48:16" (1/1) ... [2022-11-22 02:48:16,171 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:48:16" (1/1) ... [2022-11-22 02:48:16,172 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:48:16" (1/1) ... [2022-11-22 02:48:16,173 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-22 02:48:16,174 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-22 02:48:16,174 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-22 02:48:16,175 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-22 02:48:16,175 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:48:16" (1/1) ... [2022-11-22 02:48:16,189 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 02:48:16,202 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:48:16,221 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-22 02:48:16,242 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-22 02:48:16,267 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-22 02:48:16,268 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-22 02:48:16,268 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-22 02:48:16,268 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-22 02:48:16,268 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-22 02:48:16,268 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-22 02:48:16,269 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-22 02:48:16,269 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-22 02:48:16,359 INFO L235 CfgBuilder]: Building ICFG [2022-11-22 02:48:16,363 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-22 02:48:16,596 INFO L276 CfgBuilder]: Performing block encoding [2022-11-22 02:48:16,659 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-22 02:48:16,660 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-22 02:48:16,662 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 02:48:16 BoogieIcfgContainer [2022-11-22 02:48:16,662 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-22 02:48:16,664 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-22 02:48:16,664 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-22 02:48:16,667 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-22 02:48:16,668 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 02:48:15" (1/3) ... [2022-11-22 02:48:16,669 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@23f121b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 02:48:16, skipping insertion in model container [2022-11-22 02:48:16,682 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:48:16" (2/3) ... [2022-11-22 02:48:16,683 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@23f121b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 02:48:16, skipping insertion in model container [2022-11-22 02:48:16,683 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 02:48:16" (3/3) ... [2022-11-22 02:48:16,685 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd2-ll.c [2022-11-22 02:48:16,714 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-22 02:48:16,714 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-22 02:48:16,788 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-22 02:48:16,798 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@473fb665, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-22 02:48:16,799 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-22 02:48:16,803 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 15 states have internal predecessors, (19), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-22 02:48:16,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-22 02:48:16,813 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:48:16,814 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:48:16,815 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:48:16,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:48:16,823 INFO L85 PathProgramCache]: Analyzing trace with hash 1444820577, now seen corresponding path program 1 times [2022-11-22 02:48:16,833 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:48:16,834 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [79864713] [2022-11-22 02:48:16,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:48:16,834 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:48:16,932 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:48:16,933 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1867830281] [2022-11-22 02:48:16,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:48:16,933 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:48:16,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:48:16,938 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:48:16,960 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-22 02:48:17,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:48:17,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-22 02:48:17,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:48:17,085 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-22 02:48:17,085 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 02:48:17,086 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:48:17,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [79864713] [2022-11-22 02:48:17,086 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:48:17,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1867830281] [2022-11-22 02:48:17,087 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1867830281] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:48:17,087 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:48:17,088 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-22 02:48:17,090 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1706273072] [2022-11-22 02:48:17,091 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:48:17,095 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-22 02:48:17,096 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:48:17,124 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-22 02:48:17,125 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-22 02:48:17,127 INFO L87 Difference]: Start difference. First operand has 27 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 15 states have internal predecessors, (19), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-22 02:48:17,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:48:17,159 INFO L93 Difference]: Finished difference Result 46 states and 73 transitions. [2022-11-22 02:48:17,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-22 02:48:17,162 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 19 [2022-11-22 02:48:17,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:48:17,170 INFO L225 Difference]: With dead ends: 46 [2022-11-22 02:48:17,170 INFO L226 Difference]: Without dead ends: 25 [2022-11-22 02:48:17,173 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-22 02:48:17,177 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:48:17,178 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 33 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:48:17,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-11-22 02:48:17,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-11-22 02:48:17,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 12 states have (on average 1.25) internal successors, (15), 14 states have internal predecessors, (15), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-22 02:48:17,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 34 transitions. [2022-11-22 02:48:17,251 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 34 transitions. Word has length 19 [2022-11-22 02:48:17,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:48:17,253 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 34 transitions. [2022-11-22 02:48:17,253 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-22 02:48:17,254 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 34 transitions. [2022-11-22 02:48:17,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-22 02:48:17,257 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:48:17,258 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:48:17,272 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-22 02:48:17,463 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-22 02:48:17,464 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:48:17,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:48:17,465 INFO L85 PathProgramCache]: Analyzing trace with hash -599376077, now seen corresponding path program 1 times [2022-11-22 02:48:17,465 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:48:17,465 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1039940199] [2022-11-22 02:48:17,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:48:17,495 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:48:17,525 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:48:17,525 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2031154591] [2022-11-22 02:48:17,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:48:17,526 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:48:17,526 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:48:17,531 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:48:17,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-22 02:48:17,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:48:17,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-22 02:48:17,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:48:17,721 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 02:48:17,721 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:48:17,801 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 02:48:17,802 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:48:17,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1039940199] [2022-11-22 02:48:17,802 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:48:17,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2031154591] [2022-11-22 02:48:17,803 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2031154591] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:48:17,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [31940467] [2022-11-22 02:48:17,823 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-22 02:48:17,823 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:48:17,830 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:48:17,836 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:48:17,836 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:48:18,849 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 56 for LOIs [2022-11-22 02:48:18,875 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:48:21,059 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [31940467] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:48:21,060 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:48:21,060 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [5, 5] total 13 [2022-11-22 02:48:21,061 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156579203] [2022-11-22 02:48:21,061 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:48:21,062 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-22 02:48:21,062 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:48:21,062 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-22 02:48:21,063 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=103, Unknown=0, NotChecked=0, Total=156 [2022-11-22 02:48:21,063 INFO L87 Difference]: Start difference. First operand 25 states and 34 transitions. Second operand has 10 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-22 02:48:21,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:48:21,904 INFO L93 Difference]: Finished difference Result 35 states and 45 transitions. [2022-11-22 02:48:21,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-22 02:48:21,905 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 20 [2022-11-22 02:48:21,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:48:21,905 INFO L225 Difference]: With dead ends: 35 [2022-11-22 02:48:21,906 INFO L226 Difference]: Without dead ends: 27 [2022-11-22 02:48:21,906 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=53, Invalid=103, Unknown=0, NotChecked=0, Total=156 [2022-11-22 02:48:21,907 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 18 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-22 02:48:21,908 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 51 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-22 02:48:21,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-11-22 02:48:21,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-11-22 02:48:21,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-22 02:48:21,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 36 transitions. [2022-11-22 02:48:21,926 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 36 transitions. Word has length 20 [2022-11-22 02:48:21,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:48:21,927 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 36 transitions. [2022-11-22 02:48:21,927 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-22 02:48:21,927 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 36 transitions. [2022-11-22 02:48:21,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-22 02:48:21,928 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:48:21,929 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:48:21,939 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-11-22 02:48:22,134 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2022-11-22 02:48:22,134 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:48:22,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:48:22,135 INFO L85 PathProgramCache]: Analyzing trace with hash -1396531969, now seen corresponding path program 1 times [2022-11-22 02:48:22,135 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:48:22,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1121076852] [2022-11-22 02:48:22,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:48:22,136 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:48:22,161 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:48:22,161 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1576561303] [2022-11-22 02:48:22,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:48:22,162 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:48:22,162 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:48:22,163 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:48:22,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-22 02:48:22,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:48:22,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-22 02:48:22,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:48:22,300 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 02:48:22,300 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:48:22,379 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-22 02:48:22,379 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:48:22,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1121076852] [2022-11-22 02:48:22,380 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:48:22,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1576561303] [2022-11-22 02:48:22,380 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1576561303] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-22 02:48:22,380 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 02:48:22,381 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 11 [2022-11-22 02:48:22,381 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1356431787] [2022-11-22 02:48:22,381 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:48:22,382 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 02:48:22,382 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:48:22,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 02:48:22,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2022-11-22 02:48:22,384 INFO L87 Difference]: Start difference. First operand 27 states and 36 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-22 02:48:22,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:48:22,468 INFO L93 Difference]: Finished difference Result 33 states and 41 transitions. [2022-11-22 02:48:22,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 02:48:22,469 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 21 [2022-11-22 02:48:22,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:48:22,470 INFO L225 Difference]: With dead ends: 33 [2022-11-22 02:48:22,470 INFO L226 Difference]: Without dead ends: 31 [2022-11-22 02:48:22,470 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-11-22 02:48:22,472 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 7 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:48:22,472 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 81 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:48:22,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-22 02:48:22,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-11-22 02:48:22,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 18 states have internal predecessors, (20), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-22 02:48:22,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 39 transitions. [2022-11-22 02:48:22,489 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 39 transitions. Word has length 21 [2022-11-22 02:48:22,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:48:22,490 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 39 transitions. [2022-11-22 02:48:22,490 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-22 02:48:22,490 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 39 transitions. [2022-11-22 02:48:22,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-22 02:48:22,491 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:48:22,491 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:48:22,503 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-22 02:48:22,697 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:48:22,698 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:48:22,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:48:22,698 INFO L85 PathProgramCache]: Analyzing trace with hash -112873217, now seen corresponding path program 1 times [2022-11-22 02:48:22,698 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:48:22,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [129747212] [2022-11-22 02:48:22,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:48:22,699 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:48:22,709 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:48:22,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [16462822] [2022-11-22 02:48:22,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:48:22,709 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:48:22,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:48:22,711 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:48:22,717 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-22 02:48:22,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:48:22,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-22 02:48:22,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:48:22,966 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 02:48:22,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:48:23,149 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-22 02:48:23,149 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:48:23,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [129747212] [2022-11-22 02:48:23,149 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:48:23,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [16462822] [2022-11-22 02:48:23,150 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [16462822] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-22 02:48:23,150 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 02:48:23,150 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 12 [2022-11-22 02:48:23,150 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1664336024] [2022-11-22 02:48:23,150 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:48:23,151 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 02:48:23,151 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:48:23,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 02:48:23,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-11-22 02:48:23,152 INFO L87 Difference]: Start difference. First operand 31 states and 39 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-22 02:48:23,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:48:23,233 INFO L93 Difference]: Finished difference Result 44 states and 56 transitions. [2022-11-22 02:48:23,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 02:48:23,234 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 26 [2022-11-22 02:48:23,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:48:23,235 INFO L225 Difference]: With dead ends: 44 [2022-11-22 02:48:23,235 INFO L226 Difference]: Without dead ends: 42 [2022-11-22 02:48:23,236 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2022-11-22 02:48:23,237 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 6 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:48:23,237 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 105 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:48:23,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-11-22 02:48:23,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2022-11-22 02:48:23,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 23 states have internal predecessors, (26), 14 states have call successors, (14), 4 states have call predecessors, (14), 4 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-11-22 02:48:23,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 53 transitions. [2022-11-22 02:48:23,258 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 53 transitions. Word has length 26 [2022-11-22 02:48:23,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:48:23,258 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 53 transitions. [2022-11-22 02:48:23,259 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-22 02:48:23,259 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 53 transitions. [2022-11-22 02:48:23,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-22 02:48:23,260 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:48:23,260 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:48:23,271 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-22 02:48:23,466 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:48:23,467 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:48:23,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:48:23,467 INFO L85 PathProgramCache]: Analyzing trace with hash 665597119, now seen corresponding path program 1 times [2022-11-22 02:48:23,467 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:48:23,467 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723385315] [2022-11-22 02:48:23,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:48:23,474 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:48:23,506 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:48:23,506 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [849434151] [2022-11-22 02:48:23,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:48:23,507 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:48:23,507 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:48:23,509 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:48:23,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-22 02:48:23,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:48:23,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-22 02:48:23,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:48:23,751 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-22 02:48:23,751 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:48:23,894 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-22 02:48:23,894 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:48:23,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723385315] [2022-11-22 02:48:23,895 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:48:23,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [849434151] [2022-11-22 02:48:23,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [849434151] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-22 02:48:23,895 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 02:48:23,895 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 12 [2022-11-22 02:48:23,896 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805460286] [2022-11-22 02:48:23,896 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:48:23,896 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 02:48:23,896 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:48:23,897 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 02:48:23,897 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-11-22 02:48:23,897 INFO L87 Difference]: Start difference. First operand 41 states and 53 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-22 02:48:23,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:48:23,999 INFO L93 Difference]: Finished difference Result 48 states and 59 transitions. [2022-11-22 02:48:23,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 02:48:23,999 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 31 [2022-11-22 02:48:24,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:48:24,001 INFO L225 Difference]: With dead ends: 48 [2022-11-22 02:48:24,002 INFO L226 Difference]: Without dead ends: 46 [2022-11-22 02:48:24,002 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2022-11-22 02:48:24,003 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 6 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:48:24,003 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 96 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:48:24,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-11-22 02:48:24,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2022-11-22 02:48:24,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 25 states have (on average 1.16) internal successors, (29), 26 states have internal predecessors, (29), 14 states have call successors, (14), 5 states have call predecessors, (14), 5 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-11-22 02:48:24,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 56 transitions. [2022-11-22 02:48:24,036 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 56 transitions. Word has length 31 [2022-11-22 02:48:24,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:48:24,036 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 56 transitions. [2022-11-22 02:48:24,036 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-22 02:48:24,037 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 56 transitions. [2022-11-22 02:48:24,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-22 02:48:24,039 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:48:24,039 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:48:24,044 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-22 02:48:24,240 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:48:24,241 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:48:24,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:48:24,241 INFO L85 PathProgramCache]: Analyzing trace with hash -610328385, now seen corresponding path program 1 times [2022-11-22 02:48:24,241 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:48:24,241 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2022907423] [2022-11-22 02:48:24,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:48:24,242 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:48:24,252 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:48:24,252 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [33291834] [2022-11-22 02:48:24,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:48:24,253 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:48:24,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:48:24,254 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:48:24,258 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-22 02:48:24,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:48:24,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-22 02:48:24,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:48:24,471 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 11 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-22 02:48:24,471 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:48:25,071 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:48:25,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2022907423] [2022-11-22 02:48:25,072 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:48:25,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [33291834] [2022-11-22 02:48:25,072 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [33291834] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:48:25,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [34543211] [2022-11-22 02:48:25,075 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2022-11-22 02:48:25,075 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:48:25,076 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:48:25,076 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:48:25,076 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:48:26,292 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2022-11-22 02:48:26,302 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 56 for LOIs [2022-11-22 02:48:26,321 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:48:33,083 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [34543211] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:48:33,084 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 02:48:33,084 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [7] total 18 [2022-11-22 02:48:33,084 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447180875] [2022-11-22 02:48:33,084 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:48:33,085 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-22 02:48:33,085 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:48:33,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-22 02:48:33,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=328, Unknown=0, NotChecked=0, Total=420 [2022-11-22 02:48:33,086 INFO L87 Difference]: Start difference. First operand 45 states and 56 transitions. Second operand has 13 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-11-22 02:48:33,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:48:33,855 INFO L93 Difference]: Finished difference Result 70 states and 82 transitions. [2022-11-22 02:48:33,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-22 02:48:33,856 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 36 [2022-11-22 02:48:33,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:48:33,857 INFO L225 Difference]: With dead ends: 70 [2022-11-22 02:48:33,857 INFO L226 Difference]: Without dead ends: 68 [2022-11-22 02:48:33,858 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 47 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=92, Invalid=328, Unknown=0, NotChecked=0, Total=420 [2022-11-22 02:48:33,858 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 48 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 178 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 178 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-22 02:48:33,859 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 44 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 178 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-22 02:48:33,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-11-22 02:48:33,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2022-11-22 02:48:33,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 38 states have (on average 1.105263157894737) internal successors, (42), 40 states have internal predecessors, (42), 18 states have call successors, (18), 9 states have call predecessors, (18), 9 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2022-11-22 02:48:33,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 77 transitions. [2022-11-22 02:48:33,886 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 77 transitions. Word has length 36 [2022-11-22 02:48:33,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:48:33,887 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 77 transitions. [2022-11-22 02:48:33,887 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-11-22 02:48:33,887 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 77 transitions. [2022-11-22 02:48:33,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-22 02:48:33,888 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:48:33,888 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:48:33,899 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-22 02:48:34,094 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:48:34,095 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:48:34,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:48:34,095 INFO L85 PathProgramCache]: Analyzing trace with hash 1276270888, now seen corresponding path program 1 times [2022-11-22 02:48:34,095 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:48:34,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205564493] [2022-11-22 02:48:34,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:48:34,095 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:48:34,105 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:48:34,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1846761422] [2022-11-22 02:48:34,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:48:34,106 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:48:34,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:48:34,107 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:48:34,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-22 02:48:34,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:48:34,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-22 02:48:34,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:48:34,252 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-22 02:48:34,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:48:34,389 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-22 02:48:34,389 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:48:34,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [205564493] [2022-11-22 02:48:34,389 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:48:34,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1846761422] [2022-11-22 02:48:34,390 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1846761422] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:48:34,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [926818982] [2022-11-22 02:48:34,392 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-22 02:48:34,392 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:48:34,393 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:48:34,393 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:48:34,393 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:48:45,768 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2022-11-22 02:48:45,783 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 56 for LOIs [2022-11-22 02:48:45,796 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:48:53,426 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [926818982] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:48:53,427 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:48:53,427 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [7, 7] total 19 [2022-11-22 02:48:53,427 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709794303] [2022-11-22 02:48:53,427 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:48:53,428 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-22 02:48:53,428 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:48:53,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-22 02:48:53,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=255, Unknown=0, NotChecked=0, Total=342 [2022-11-22 02:48:53,429 INFO L87 Difference]: Start difference. First operand 66 states and 77 transitions. Second operand has 14 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-22 02:48:55,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:48:55,659 INFO L93 Difference]: Finished difference Result 92 states and 109 transitions. [2022-11-22 02:48:55,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-22 02:48:55,660 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 45 [2022-11-22 02:48:55,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:48:55,661 INFO L225 Difference]: With dead ends: 92 [2022-11-22 02:48:55,661 INFO L226 Difference]: Without dead ends: 84 [2022-11-22 02:48:55,662 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 98 SyntacticMatches, 18 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=99, Invalid=281, Unknown=0, NotChecked=0, Total=380 [2022-11-22 02:48:55,662 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 66 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 185 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 220 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 185 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-22 02:48:55,663 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 44 Invalid, 220 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 185 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-22 02:48:55,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-11-22 02:48:55,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2022-11-22 02:48:55,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 50 states have (on average 1.12) internal successors, (56), 51 states have internal predecessors, (56), 22 states have call successors, (22), 11 states have call predecessors, (22), 11 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2022-11-22 02:48:55,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 99 transitions. [2022-11-22 02:48:55,696 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 99 transitions. Word has length 45 [2022-11-22 02:48:55,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:48:55,696 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 99 transitions. [2022-11-22 02:48:55,696 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-22 02:48:55,697 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 99 transitions. [2022-11-22 02:48:55,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-22 02:48:55,698 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:48:55,698 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:48:55,710 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-22 02:48:55,904 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-22 02:48:55,904 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:48:55,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:48:55,905 INFO L85 PathProgramCache]: Analyzing trace with hash 1047826176, now seen corresponding path program 1 times [2022-11-22 02:48:55,905 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:48:55,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135080447] [2022-11-22 02:48:55,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:48:55,905 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:48:55,914 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:48:55,914 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [456915701] [2022-11-22 02:48:55,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:48:55,914 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:48:55,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:48:55,915 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:48:55,921 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-22 02:48:55,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:48:55,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-22 02:48:55,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:48:56,099 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-22 02:48:56,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:48:56,226 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-22 02:48:56,227 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:48:56,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135080447] [2022-11-22 02:48:56,227 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:48:56,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [456915701] [2022-11-22 02:48:56,227 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [456915701] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:48:56,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [113252936] [2022-11-22 02:48:56,233 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2022-11-22 02:48:56,233 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:48:56,234 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:48:56,234 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:48:56,235 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:49:02,492 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 41 for LOIs [2022-11-22 02:49:02,552 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 56 for LOIs [2022-11-22 02:49:02,565 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:49:08,700 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2509#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2022-11-22 02:49:08,701 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:49:08,701 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:49:08,701 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2022-11-22 02:49:08,701 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823580403] [2022-11-22 02:49:08,702 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:49:08,702 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-22 02:49:08,702 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:49:08,703 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-22 02:49:08,703 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=484, Unknown=0, NotChecked=0, Total=600 [2022-11-22 02:49:08,704 INFO L87 Difference]: Start difference. First operand 84 states and 99 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2022-11-22 02:49:08,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:49:08,975 INFO L93 Difference]: Finished difference Result 95 states and 113 transitions. [2022-11-22 02:49:08,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-22 02:49:08,976 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) Word has length 58 [2022-11-22 02:49:08,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:49:08,979 INFO L225 Difference]: With dead ends: 95 [2022-11-22 02:49:08,979 INFO L226 Difference]: Without dead ends: 93 [2022-11-22 02:49:08,980 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 141 SyntacticMatches, 8 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=132, Invalid=570, Unknown=0, NotChecked=0, Total=702 [2022-11-22 02:49:08,980 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 18 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:49:08,981 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 69 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:49:08,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-11-22 02:49:09,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2022-11-22 02:49:09,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 54 states have (on average 1.1111111111111112) internal successors, (60), 56 states have internal predecessors, (60), 26 states have call successors, (26), 12 states have call predecessors, (26), 12 states have return successors, (25), 24 states have call predecessors, (25), 25 states have call successors, (25) [2022-11-22 02:49:09,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 111 transitions. [2022-11-22 02:49:09,022 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 111 transitions. Word has length 58 [2022-11-22 02:49:09,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:49:09,022 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 111 transitions. [2022-11-22 02:49:09,023 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2022-11-22 02:49:09,023 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 111 transitions. [2022-11-22 02:49:09,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-11-22 02:49:09,024 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:49:09,025 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 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, 1, 1, 1] [2022-11-22 02:49:09,031 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-22 02:49:09,230 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-22 02:49:09,231 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:49:09,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:49:09,231 INFO L85 PathProgramCache]: Analyzing trace with hash -568433657, now seen corresponding path program 1 times [2022-11-22 02:49:09,231 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:49:09,231 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575936334] [2022-11-22 02:49:09,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:49:09,231 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:49:09,243 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:49:09,244 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [584132446] [2022-11-22 02:49:09,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:49:09,244 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:49:09,244 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:49:09,250 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:49:09,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-22 02:49:09,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:49:09,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 43 conjunts are in the unsatisfiable core [2022-11-22 02:49:09,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:49:09,876 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 16 proven. 11 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2022-11-22 02:49:09,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:49:10,676 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-11-22 02:49:10,676 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:49:10,677 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575936334] [2022-11-22 02:49:10,677 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:49:10,677 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [584132446] [2022-11-22 02:49:10,677 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [584132446] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:49:10,677 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1236310729] [2022-11-22 02:49:10,679 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-22 02:49:10,679 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:49:10,680 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:49:10,680 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:49:10,680 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:49:21,695 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 33 for LOIs [2022-11-22 02:49:21,722 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 56 for LOIs [2022-11-22 02:49:21,735 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:49:27,698 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3225#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (= |#NULL.base| 0))' at error location [2022-11-22 02:49:27,698 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:49:27,698 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:49:27,698 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 20 [2022-11-22 02:49:27,698 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224359121] [2022-11-22 02:49:27,699 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:49:27,699 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-22 02:49:27,699 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:49:27,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-22 02:49:27,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=1239, Unknown=0, NotChecked=0, Total=1406 [2022-11-22 02:49:27,701 INFO L87 Difference]: Start difference. First operand 93 states and 111 transitions. Second operand has 20 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 17 states have internal predecessors, (31), 10 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2022-11-22 02:49:40,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:49:40,335 INFO L93 Difference]: Finished difference Result 163 states and 219 transitions. [2022-11-22 02:49:40,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-22 02:49:40,336 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 17 states have internal predecessors, (31), 10 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) Word has length 67 [2022-11-22 02:49:40,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:49:40,338 INFO L225 Difference]: With dead ends: 163 [2022-11-22 02:49:40,338 INFO L226 Difference]: Without dead ends: 161 [2022-11-22 02:49:40,339 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 154 SyntacticMatches, 9 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1180 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=414, Invalid=2892, Unknown=0, NotChecked=0, Total=3306 [2022-11-22 02:49:40,340 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 102 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 847 mSolverCounterSat, 174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 317 SdHoareTripleChecker+Invalid, 1021 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 174 IncrementalHoareTripleChecker+Valid, 847 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2022-11-22 02:49:40,340 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [106 Valid, 317 Invalid, 1021 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [174 Valid, 847 Invalid, 0 Unknown, 0 Unchecked, 5.6s Time] [2022-11-22 02:49:40,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2022-11-22 02:49:40,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 151. [2022-11-22 02:49:40,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 81 states have (on average 1.1975308641975309) internal successors, (97), 83 states have internal predecessors, (97), 55 states have call successors, (55), 14 states have call predecessors, (55), 14 states have return successors, (54), 53 states have call predecessors, (54), 54 states have call successors, (54) [2022-11-22 02:49:40,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 206 transitions. [2022-11-22 02:49:40,450 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 206 transitions. Word has length 67 [2022-11-22 02:49:40,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:49:40,452 INFO L495 AbstractCegarLoop]: Abstraction has 151 states and 206 transitions. [2022-11-22 02:49:40,452 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 17 states have internal predecessors, (31), 10 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2022-11-22 02:49:40,452 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 206 transitions. [2022-11-22 02:49:40,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2022-11-22 02:49:40,461 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:49:40,461 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 4, 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, 1, 1, 1, 1, 1] [2022-11-22 02:49:40,475 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-22 02:49:40,667 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:49:40,667 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:49:40,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:49:40,668 INFO L85 PathProgramCache]: Analyzing trace with hash 189361655, now seen corresponding path program 1 times [2022-11-22 02:49:40,668 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:49:40,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1748476296] [2022-11-22 02:49:40,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:49:40,668 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:49:40,688 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:49:40,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2012520956] [2022-11-22 02:49:40,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:49:40,689 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:49:40,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:49:40,690 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:49:40,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-22 02:49:40,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:49:40,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-22 02:49:40,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:49:42,040 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 35 proven. 18 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2022-11-22 02:49:42,041 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:49:42,521 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 39 proven. 7 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2022-11-22 02:49:42,521 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:49:42,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1748476296] [2022-11-22 02:49:42,522 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:49:42,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2012520956] [2022-11-22 02:49:42,522 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2012520956] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:49:42,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2056759994] [2022-11-22 02:49:42,524 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-22 02:49:42,524 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:49:42,525 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:49:42,525 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:49:42,525 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:50:13,733 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 53 for LOIs [2022-11-22 02:50:13,789 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 56 for LOIs [2022-11-22 02:50:13,802 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:50:28,628 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4218#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:50:28,628 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:50:28,628 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:50:28,628 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 8] total 19 [2022-11-22 02:50:28,628 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [226127487] [2022-11-22 02:50:28,628 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:50:28,629 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-22 02:50:28,629 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:50:28,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-22 02:50:28,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=1237, Unknown=0, NotChecked=0, Total=1406 [2022-11-22 02:50:28,630 INFO L87 Difference]: Start difference. First operand 151 states and 206 transitions. Second operand has 19 states, 18 states have (on average 1.9444444444444444) internal successors, (35), 15 states have internal predecessors, (35), 9 states have call successors, (24), 3 states have call predecessors, (24), 3 states have return successors, (24), 9 states have call predecessors, (24), 9 states have call successors, (24) [2022-11-22 02:50:33,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:50:33,555 INFO L93 Difference]: Finished difference Result 195 states and 266 transitions. [2022-11-22 02:50:33,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-22 02:50:33,556 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.9444444444444444) internal successors, (35), 15 states have internal predecessors, (35), 9 states have call successors, (24), 3 states have call predecessors, (24), 3 states have return successors, (24), 9 states have call predecessors, (24), 9 states have call successors, (24) Word has length 72 [2022-11-22 02:50:33,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:50:33,565 INFO L225 Difference]: With dead ends: 195 [2022-11-22 02:50:33,566 INFO L226 Difference]: Without dead ends: 189 [2022-11-22 02:50:33,567 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 173 SyntacticMatches, 10 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1010 ImplicationChecksByTransitivity, 17.4s TimeCoverageRelationStatistics Valid=270, Invalid=1986, Unknown=0, NotChecked=0, Total=2256 [2022-11-22 02:50:33,568 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 68 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 561 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 672 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 561 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:50:33,568 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [71 Valid, 128 Invalid, 672 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 561 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2022-11-22 02:50:33,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2022-11-22 02:50:33,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 161. [2022-11-22 02:50:33,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 90 states have (on average 1.1555555555555554) internal successors, (104), 91 states have internal predecessors, (104), 53 states have call successors, (53), 17 states have call predecessors, (53), 17 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) [2022-11-22 02:50:33,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 209 transitions. [2022-11-22 02:50:33,641 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 209 transitions. Word has length 72 [2022-11-22 02:50:33,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:50:33,642 INFO L495 AbstractCegarLoop]: Abstraction has 161 states and 209 transitions. [2022-11-22 02:50:33,642 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 1.9444444444444444) internal successors, (35), 15 states have internal predecessors, (35), 9 states have call successors, (24), 3 states have call predecessors, (24), 3 states have return successors, (24), 9 states have call predecessors, (24), 9 states have call successors, (24) [2022-11-22 02:50:33,642 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 209 transitions. [2022-11-22 02:50:33,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-11-22 02:50:33,643 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:50:33,643 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:50:33,650 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-22 02:50:33,850 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:50:33,850 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:50:33,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:50:33,851 INFO L85 PathProgramCache]: Analyzing trace with hash -581231213, now seen corresponding path program 1 times [2022-11-22 02:50:33,851 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:50:33,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [11345877] [2022-11-22 02:50:33,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:50:33,851 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:50:33,862 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:50:33,862 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1648005439] [2022-11-22 02:50:33,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:50:33,867 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:50:33,867 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:50:33,869 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:50:33,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-22 02:50:33,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:50:33,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-22 02:50:33,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:50:34,802 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 51 proven. 22 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2022-11-22 02:50:34,802 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:50:38,844 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 51 proven. 19 refuted. 0 times theorem prover too weak. 202 trivial. 0 not checked. [2022-11-22 02:50:38,844 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:50:38,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [11345877] [2022-11-22 02:50:38,844 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:50:38,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1648005439] [2022-11-22 02:50:38,844 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1648005439] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:50:38,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1631538984] [2022-11-22 02:50:38,846 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-11-22 02:50:38,847 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:50:38,847 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:50:38,847 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:50:38,847 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:50:51,020 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 33 for LOIs [2022-11-22 02:50:51,044 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 56 for LOIs [2022-11-22 02:50:51,057 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:51:00,989 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5327#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2022-11-22 02:51:00,990 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:51:00,990 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:51:00,990 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 21 [2022-11-22 02:51:00,990 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700848734] [2022-11-22 02:51:00,990 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:51:00,991 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-22 02:51:00,991 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:51:00,992 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-22 02:51:00,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=1210, Unknown=1, NotChecked=0, Total=1406 [2022-11-22 02:51:00,992 INFO L87 Difference]: Start difference. First operand 161 states and 209 transitions. Second operand has 21 states, 19 states have (on average 2.0) internal successors, (38), 18 states have internal predecessors, (38), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 11 states have call predecessors, (30), 10 states have call successors, (30) [2022-11-22 02:51:09,707 WARN L233 SmtUtils]: Spent 5.16s on a formula simplification that was a NOOP. DAG size: 70 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:51:16,229 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:51:39,439 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:51:53,089 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:51:58,360 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:52:00,939 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:52:02,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:52:02,503 INFO L93 Difference]: Finished difference Result 223 states and 299 transitions. [2022-11-22 02:52:02,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-22 02:52:02,504 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 2.0) internal successors, (38), 18 states have internal predecessors, (38), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 11 states have call predecessors, (30), 10 states have call successors, (30) Word has length 83 [2022-11-22 02:52:02,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:52:02,505 INFO L225 Difference]: With dead ends: 223 [2022-11-22 02:52:02,505 INFO L226 Difference]: Without dead ends: 221 [2022-11-22 02:52:02,507 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 198 SyntacticMatches, 13 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1366 ImplicationChecksByTransitivity, 44.6s TimeCoverageRelationStatistics Valid=513, Invalid=2678, Unknown=1, NotChecked=0, Total=3192 [2022-11-22 02:52:02,508 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 110 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 1032 mSolverCounterSat, 175 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 29.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 1212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 175 IncrementalHoareTripleChecker+Valid, 1032 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 29.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:52:02,508 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [119 Valid, 123 Invalid, 1212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [175 Valid, 1032 Invalid, 5 Unknown, 0 Unchecked, 29.5s Time] [2022-11-22 02:52:02,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2022-11-22 02:52:02,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 204. [2022-11-22 02:52:02,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 115 states have (on average 1.1565217391304348) internal successors, (133), 117 states have internal predecessors, (133), 69 states have call successors, (69), 19 states have call predecessors, (69), 19 states have return successors, (68), 67 states have call predecessors, (68), 68 states have call successors, (68) [2022-11-22 02:52:02,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 270 transitions. [2022-11-22 02:52:02,678 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 270 transitions. Word has length 83 [2022-11-22 02:52:02,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:52:02,678 INFO L495 AbstractCegarLoop]: Abstraction has 204 states and 270 transitions. [2022-11-22 02:52:02,678 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 2.0) internal successors, (38), 18 states have internal predecessors, (38), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 11 states have call predecessors, (30), 10 states have call successors, (30) [2022-11-22 02:52:02,679 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 270 transitions. [2022-11-22 02:52:02,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-11-22 02:52:02,680 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:52:02,680 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:52:02,687 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-11-22 02:52:02,886 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-22 02:52:02,886 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:52:02,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:52:02,887 INFO L85 PathProgramCache]: Analyzing trace with hash -1528591660, now seen corresponding path program 2 times [2022-11-22 02:52:02,887 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:52:02,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1922750939] [2022-11-22 02:52:02,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:52:02,887 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:52:02,897 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:52:02,897 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1124335338] [2022-11-22 02:52:02,897 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:52:02,897 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:52:02,897 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:52:02,898 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:52:02,914 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-22 02:52:02,959 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-22 02:52:02,959 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:52:02,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-22 02:52:02,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:52:02,997 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 43 proven. 0 refuted. 0 times theorem prover too weak. 282 trivial. 0 not checked. [2022-11-22 02:52:02,997 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 02:52:02,997 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:52:02,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1922750939] [2022-11-22 02:52:02,998 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:52:02,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1124335338] [2022-11-22 02:52:02,998 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1124335338] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:52:02,998 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:52:03,000 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-22 02:52:03,000 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800637087] [2022-11-22 02:52:03,000 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:52:03,001 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 02:52:03,001 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:52:03,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 02:52:03,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-22 02:52:03,002 INFO L87 Difference]: Start difference. First operand 204 states and 270 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2022-11-22 02:52:03,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:52:03,239 INFO L93 Difference]: Finished difference Result 288 states and 377 transitions. [2022-11-22 02:52:03,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 02:52:03,239 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) Word has length 92 [2022-11-22 02:52:03,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:52:03,241 INFO L225 Difference]: With dead ends: 288 [2022-11-22 02:52:03,241 INFO L226 Difference]: Without dead ends: 197 [2022-11-22 02:52:03,242 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-22 02:52:03,243 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 7 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:52:03,243 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 108 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:52:03,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2022-11-22 02:52:03,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 194. [2022-11-22 02:52:03,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 109 states have (on average 1.1192660550458715) internal successors, (122), 112 states have internal predecessors, (122), 65 states have call successors, (65), 19 states have call predecessors, (65), 19 states have return successors, (64), 62 states have call predecessors, (64), 64 states have call successors, (64) [2022-11-22 02:52:03,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 251 transitions. [2022-11-22 02:52:03,367 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 251 transitions. Word has length 92 [2022-11-22 02:52:03,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:52:03,367 INFO L495 AbstractCegarLoop]: Abstraction has 194 states and 251 transitions. [2022-11-22 02:52:03,368 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2022-11-22 02:52:03,368 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 251 transitions. [2022-11-22 02:52:03,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2022-11-22 02:52:03,369 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:52:03,369 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:52:03,374 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-22 02:52:03,570 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-22 02:52:03,571 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:52:03,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:52:03,571 INFO L85 PathProgramCache]: Analyzing trace with hash -990146452, now seen corresponding path program 2 times [2022-11-22 02:52:03,571 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:52:03,572 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1242162888] [2022-11-22 02:52:03,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:52:03,572 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:52:03,579 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:52:03,579 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [528184352] [2022-11-22 02:52:03,580 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:52:03,580 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:52:03,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:52:03,581 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:52:03,584 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-22 02:52:03,654 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-22 02:52:03,654 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:52:03,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 43 conjunts are in the unsatisfiable core [2022-11-22 02:52:03,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:52:04,115 INFO L134 CoverageAnalysis]: Checked inductivity of 436 backedges. 31 proven. 32 refuted. 0 times theorem prover too weak. 373 trivial. 0 not checked. [2022-11-22 02:52:04,115 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:52:04,496 INFO L134 CoverageAnalysis]: Checked inductivity of 436 backedges. 28 proven. 32 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2022-11-22 02:52:04,497 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:52:04,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1242162888] [2022-11-22 02:52:04,497 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:52:04,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [528184352] [2022-11-22 02:52:04,497 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [528184352] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:52:04,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1880992402] [2022-11-22 02:52:04,499 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-11-22 02:52:04,499 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:52:04,500 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:52:04,500 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:52:04,500 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:52:29,297 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 55 for LOIs [2022-11-22 02:52:29,362 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 56 for LOIs [2022-11-22 02:52:29,375 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:52:41,247 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7684#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:52:41,247 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:52:41,248 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:52:41,248 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 17 [2022-11-22 02:52:41,248 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44820502] [2022-11-22 02:52:41,248 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:52:41,249 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-22 02:52:41,249 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:52:41,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-22 02:52:41,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=927, Unknown=0, NotChecked=0, Total=1056 [2022-11-22 02:52:41,251 INFO L87 Difference]: Start difference. First operand 194 states and 251 transitions. Second operand has 17 states, 16 states have (on average 2.3125) internal successors, (37), 15 states have internal predecessors, (37), 11 states have call successors, (36), 3 states have call predecessors, (36), 2 states have return successors, (34), 11 states have call predecessors, (34), 11 states have call successors, (34) [2022-11-22 02:52:44,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:52:44,164 INFO L93 Difference]: Finished difference Result 225 states and 295 transitions. [2022-11-22 02:52:44,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-22 02:52:44,165 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.3125) internal successors, (37), 15 states have internal predecessors, (37), 11 states have call successors, (36), 3 states have call predecessors, (36), 2 states have return successors, (34), 11 states have call predecessors, (34), 11 states have call successors, (34) Word has length 100 [2022-11-22 02:52:44,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:52:44,167 INFO L225 Difference]: With dead ends: 225 [2022-11-22 02:52:44,167 INFO L226 Difference]: Without dead ends: 223 [2022-11-22 02:52:44,168 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 249 SyntacticMatches, 18 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 795 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=213, Invalid=1509, Unknown=0, NotChecked=0, Total=1722 [2022-11-22 02:52:44,169 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 35 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 687 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 738 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 687 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:52:44,169 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 193 Invalid, 738 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 687 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-11-22 02:52:44,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2022-11-22 02:52:44,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 198. [2022-11-22 02:52:44,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 112 states have (on average 1.1160714285714286) internal successors, (125), 115 states have internal predecessors, (125), 65 states have call successors, (65), 20 states have call predecessors, (65), 20 states have return successors, (64), 62 states have call predecessors, (64), 64 states have call successors, (64) [2022-11-22 02:52:44,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 254 transitions. [2022-11-22 02:52:44,306 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 254 transitions. Word has length 100 [2022-11-22 02:52:44,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:52:44,307 INFO L495 AbstractCegarLoop]: Abstraction has 198 states and 254 transitions. [2022-11-22 02:52:44,307 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.3125) internal successors, (37), 15 states have internal predecessors, (37), 11 states have call successors, (36), 3 states have call predecessors, (36), 2 states have return successors, (34), 11 states have call predecessors, (34), 11 states have call successors, (34) [2022-11-22 02:52:44,307 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 254 transitions. [2022-11-22 02:52:44,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2022-11-22 02:52:44,309 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:52:44,310 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:52:44,316 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-22 02:52:44,515 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:52:44,516 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:52:44,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:52:44,517 INFO L85 PathProgramCache]: Analyzing trace with hash -130323247, now seen corresponding path program 3 times [2022-11-22 02:52:44,517 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:52:44,517 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1441869063] [2022-11-22 02:52:44,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:52:44,517 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:52:44,526 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:52:44,526 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [520479650] [2022-11-22 02:52:44,527 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:52:44,527 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:52:44,527 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:52:44,528 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:52:44,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-22 02:52:44,631 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:52:44,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:52:44,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 65 conjunts are in the unsatisfiable core [2022-11-22 02:52:44,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:52:45,690 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 32 proven. 46 refuted. 0 times theorem prover too weak. 489 trivial. 0 not checked. [2022-11-22 02:52:45,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:52:48,688 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 32 proven. 43 refuted. 0 times theorem prover too weak. 492 trivial. 0 not checked. [2022-11-22 02:52:48,689 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:52:48,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1441869063] [2022-11-22 02:52:48,689 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:52:48,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [520479650] [2022-11-22 02:52:48,689 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [520479650] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:52:48,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [573980672] [2022-11-22 02:52:48,692 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-22 02:52:48,692 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:52:48,692 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:52:48,693 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:52:48,693 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:53:16,738 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 55 for LOIs [2022-11-22 02:53:16,801 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 56 for LOIs [2022-11-22 02:53:16,813 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:53:35,341 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9078#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:53:35,341 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:53:35,341 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:53:35,341 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 27 [2022-11-22 02:53:35,342 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672698835] [2022-11-22 02:53:35,342 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:53:35,342 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-22 02:53:35,342 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:53:35,343 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-22 02:53:35,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=1676, Unknown=0, NotChecked=0, Total=1892 [2022-11-22 02:53:35,344 INFO L87 Difference]: Start difference. First operand 198 states and 254 transitions. Second operand has 27 states, 24 states have (on average 1.875) internal successors, (45), 24 states have internal predecessors, (45), 14 states have call successors, (41), 3 states have call predecessors, (41), 2 states have return successors, (40), 12 states have call predecessors, (40), 12 states have call successors, (40) [2022-11-22 02:54:20,622 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:54:27,972 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:54:34,753 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.02s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:54:34,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:54:34,952 INFO L93 Difference]: Finished difference Result 340 states and 473 transitions. [2022-11-22 02:54:34,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-22 02:54:34,953 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 24 states have (on average 1.875) internal successors, (45), 24 states have internal predecessors, (45), 14 states have call successors, (41), 3 states have call predecessors, (41), 2 states have return successors, (40), 12 states have call predecessors, (40), 12 states have call successors, (40) Word has length 114 [2022-11-22 02:54:34,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:54:34,956 INFO L225 Difference]: With dead ends: 340 [2022-11-22 02:54:34,956 INFO L226 Difference]: Without dead ends: 332 [2022-11-22 02:54:34,959 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 273 SyntacticMatches, 25 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3104 ImplicationChecksByTransitivity, 49.3s TimeCoverageRelationStatistics Valid=976, Invalid=6333, Unknown=1, NotChecked=0, Total=7310 [2022-11-22 02:54:34,959 INFO L413 NwaCegarLoop]: 102 mSDtfsCounter, 243 mSDsluCounter, 449 mSDsCounter, 0 mSdLazyCounter, 1859 mSolverCounterSat, 461 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 30.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 251 SdHoareTripleChecker+Valid, 551 SdHoareTripleChecker+Invalid, 2322 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 461 IncrementalHoareTripleChecker+Valid, 1859 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 31.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:54:34,960 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [251 Valid, 551 Invalid, 2322 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [461 Valid, 1859 Invalid, 2 Unknown, 0 Unchecked, 31.0s Time] [2022-11-22 02:54:34,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 332 states. [2022-11-22 02:54:35,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 332 to 303. [2022-11-22 02:54:35,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 303 states, 158 states have (on average 1.1518987341772151) internal successors, (182), 161 states have internal predecessors, (182), 121 states have call successors, (121), 23 states have call predecessors, (121), 23 states have return successors, (120), 118 states have call predecessors, (120), 120 states have call successors, (120) [2022-11-22 02:54:35,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 303 states to 303 states and 423 transitions. [2022-11-22 02:54:35,263 INFO L78 Accepts]: Start accepts. Automaton has 303 states and 423 transitions. Word has length 114 [2022-11-22 02:54:35,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:54:35,264 INFO L495 AbstractCegarLoop]: Abstraction has 303 states and 423 transitions. [2022-11-22 02:54:35,264 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 24 states have (on average 1.875) internal successors, (45), 24 states have internal predecessors, (45), 14 states have call successors, (41), 3 states have call predecessors, (41), 2 states have return successors, (40), 12 states have call predecessors, (40), 12 states have call successors, (40) [2022-11-22 02:54:35,264 INFO L276 IsEmpty]: Start isEmpty. Operand 303 states and 423 transitions. [2022-11-22 02:54:35,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2022-11-22 02:54:35,267 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:54:35,267 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:54:35,277 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-22 02:54:35,473 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:54:35,474 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:54:35,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:54:35,474 INFO L85 PathProgramCache]: Analyzing trace with hash 309416541, now seen corresponding path program 3 times [2022-11-22 02:54:35,474 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:54:35,474 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [601632918] [2022-11-22 02:54:35,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:54:35,475 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:54:35,484 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:54:35,485 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2064228395] [2022-11-22 02:54:35,485 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:54:35,485 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:54:35,486 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:54:35,487 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:54:35,506 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-22 02:54:35,606 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:54:35,606 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:54:35,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 72 conjunts are in the unsatisfiable core [2022-11-22 02:54:35,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:54:37,601 INFO L134 CoverageAnalysis]: Checked inductivity of 797 backedges. 91 proven. 67 refuted. 0 times theorem prover too weak. 639 trivial. 0 not checked. [2022-11-22 02:54:37,602 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:55:21,749 INFO L134 CoverageAnalysis]: Checked inductivity of 797 backedges. 91 proven. 64 refuted. 0 times theorem prover too weak. 642 trivial. 0 not checked. [2022-11-22 02:55:21,749 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:55:21,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [601632918] [2022-11-22 02:55:21,749 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:55:21,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2064228395] [2022-11-22 02:55:21,749 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2064228395] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:55:21,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [523965565] [2022-11-22 02:55:21,751 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-11-22 02:55:21,752 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:55:21,752 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:55:21,752 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:55:21,753 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:55:34,103 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 33 for LOIs [2022-11-22 02:55:34,129 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 56 for LOIs [2022-11-22 02:55:34,142 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:56:07,373 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11009#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (= |#NULL.base| 0))' at error location [2022-11-22 02:56:07,373 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:56:07,373 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:56:07,373 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15] total 29 [2022-11-22 02:56:07,373 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959445700] [2022-11-22 02:56:07,373 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:56:07,374 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-22 02:56:07,374 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:56:07,374 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-22 02:56:07,375 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=1781, Unknown=3, NotChecked=0, Total=2070 [2022-11-22 02:56:07,375 INFO L87 Difference]: Start difference. First operand 303 states and 423 transitions. Second operand has 29 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 26 states have internal predecessors, (52), 15 states have call successors, (47), 3 states have call predecessors, (47), 3 states have return successors, (46), 15 states have call predecessors, (46), 14 states have call successors, (46) [2022-11-22 02:56:09,948 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.20s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:56:11,164 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.08s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:56:25,254 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.06s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:56:27,427 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:56:45,278 WARN L233 SmtUtils]: Spent 14.87s on a formula simplification that was a NOOP. DAG size: 99 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:56:47,341 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:56:57,681 WARN L233 SmtUtils]: Spent 9.58s on a formula simplification that was a NOOP. DAG size: 83 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:57:44,594 WARN L233 SmtUtils]: Spent 44.22s on a formula simplification that was a NOOP. DAG size: 115 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:57:47,137 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:58:09,977 WARN L233 SmtUtils]: Spent 20.36s on a formula simplification that was a NOOP. DAG size: 100 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:58:12,941 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:59:02,470 WARN L233 SmtUtils]: Spent 26.70s on a formula simplification that was a NOOP. DAG size: 99 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:59:04,516 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:59:06,522 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:59:19,437 WARN L233 SmtUtils]: Spent 9.05s on a formula simplification that was a NOOP. DAG size: 83 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:59:33,323 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 4.06s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:59:35,329 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:59:37,894 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 03:00:10,675 WARN L233 SmtUtils]: Spent 23.42s on a formula simplification that was a NOOP. DAG size: 99 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 03:00:12,938 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 03:00:14,940 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 03:00:25,419 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 03:00:29,010 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.87s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 03:00:47,135 WARN L233 SmtUtils]: Spent 15.89s on a formula simplification that was a NOOP. DAG size: 98 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 03:00:48,633 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.50s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 03:00:50,636 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 03:00:52,642 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 03:00:54,847 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 03:01:02,504 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 03:01:10,190 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 03:01:12,194 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 03:01:14,382 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 03:01:15,603 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.22s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 03:01:18,917 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 03:01:26,340 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 03:01:28,383 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 03:01:30,389 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 03:01:44,095 WARN L233 SmtUtils]: Spent 7.72s on a formula simplification that was a NOOP. DAG size: 78 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 03:01:50,433 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 03:01:53,842 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 03:01:55,845 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 03:01:57,993 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 03:02:00,062 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 03:02:02,267 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 03:02:02,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 03:02:02,796 INFO L93 Difference]: Finished difference Result 423 states and 600 transitions. [2022-11-22 03:02:02,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-22 03:02:02,797 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 26 states have internal predecessors, (52), 15 states have call successors, (47), 3 states have call predecessors, (47), 3 states have return successors, (46), 15 states have call predecessors, (46), 14 states have call successors, (46) Word has length 130 [2022-11-22 03:02:02,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 03:02:02,800 INFO L225 Difference]: With dead ends: 423 [2022-11-22 03:02:02,801 INFO L226 Difference]: Without dead ends: 421 [2022-11-22 03:02:02,803 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 324 SyntacticMatches, 20 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2715 ImplicationChecksByTransitivity, 297.6s TimeCoverageRelationStatistics Valid=1057, Invalid=4779, Unknown=16, NotChecked=0, Total=5852 [2022-11-22 03:02:02,803 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 214 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 1519 mSolverCounterSat, 334 mSolverCounterUnsat, 29 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 98.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 196 SdHoareTripleChecker+Invalid, 1882 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 334 IncrementalHoareTripleChecker+Valid, 1519 IncrementalHoareTripleChecker+Invalid, 29 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 98.7s IncrementalHoareTripleChecker+Time [2022-11-22 03:02:02,804 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [227 Valid, 196 Invalid, 1882 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [334 Valid, 1519 Invalid, 29 Unknown, 0 Unchecked, 98.7s Time] [2022-11-22 03:02:02,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421 states. [2022-11-22 03:02:03,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421 to 380. [2022-11-22 03:02:03,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 380 states, 197 states have (on average 1.1522842639593909) internal successors, (227), 203 states have internal predecessors, (227), 157 states have call successors, (157), 25 states have call predecessors, (157), 25 states have return successors, (156), 151 states have call predecessors, (156), 156 states have call successors, (156) [2022-11-22 03:02:03,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 380 states to 380 states and 540 transitions. [2022-11-22 03:02:03,405 INFO L78 Accepts]: Start accepts. Automaton has 380 states and 540 transitions. Word has length 130 [2022-11-22 03:02:03,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 03:02:03,406 INFO L495 AbstractCegarLoop]: Abstraction has 380 states and 540 transitions. [2022-11-22 03:02:03,406 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 26 states have internal predecessors, (52), 15 states have call successors, (47), 3 states have call predecessors, (47), 3 states have return successors, (46), 15 states have call predecessors, (46), 14 states have call successors, (46) [2022-11-22 03:02:03,406 INFO L276 IsEmpty]: Start isEmpty. Operand 380 states and 540 transitions. [2022-11-22 03:02:03,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2022-11-22 03:02:03,409 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 03:02:03,409 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 03:02:03,420 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-22 03:02:03,615 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-22 03:02:03,615 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 03:02:03,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 03:02:03,616 INFO L85 PathProgramCache]: Analyzing trace with hash 896941348, now seen corresponding path program 4 times [2022-11-22 03:02:03,616 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 03:02:03,616 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1386858677] [2022-11-22 03:02:03,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 03:02:03,616 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 03:02:03,627 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 03:02:03,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1371501786] [2022-11-22 03:02:03,628 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 03:02:03,628 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 03:02:03,628 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 [2022-11-22 03:02:03,630 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 03:02:03,635 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e8fdde1d-e94e-4379-b38c-677aa9391d71/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-22 03:02:03,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 03:02:03,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 55 conjunts are in the unsatisfiable core [2022-11-22 03:02:03,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 03:02:04,780 INFO L134 CoverageAnalysis]: Checked inductivity of 874 backedges. 40 proven. 65 refuted. 0 times theorem prover too weak. 769 trivial. 0 not checked. [2022-11-22 03:02:04,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 03:02:06,535 INFO L134 CoverageAnalysis]: Checked inductivity of 874 backedges. 40 proven. 62 refuted. 0 times theorem prover too weak. 772 trivial. 0 not checked. [2022-11-22 03:02:06,535 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 03:02:06,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1386858677] [2022-11-22 03:02:06,536 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 03:02:06,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1371501786] [2022-11-22 03:02:06,536 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1371501786] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 03:02:06,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1521537705] [2022-11-22 03:02:06,538 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-22 03:02:06,538 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 03:02:06,538 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 03:02:06,539 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 03:02:06,539 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 03:02:19,447 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 17 iterations. Over-approximation may be very coarse. [2022-11-22 03:02:26,629 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 53 for LOIs [2022-11-22 03:02:26,683 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 56 for LOIs [2022-11-22 03:02:26,696 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 03:02:40,015 WARN L233 SmtUtils]: Spent 6.66s on a formula simplification. DAG size of input: 147 DAG size of output: 122 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 03:02:53,389 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13210#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 03:02:53,389 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 03:02:53,389 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 03:02:53,390 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2022-11-22 03:02:53,390 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981157979] [2022-11-22 03:02:53,390 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 03:02:53,390 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-22 03:02:53,390 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 03:02:53,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-22 03:02:53,392 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=1672, Unknown=0, NotChecked=0, Total=1892 [2022-11-22 03:02:53,392 INFO L87 Difference]: Start difference. First operand 380 states and 540 transitions. Second operand has 26 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 23 states have internal predecessors, (43), 16 states have call successors, (49), 3 states have call predecessors, (49), 2 states have return successors, (48), 14 states have call predecessors, (48), 14 states have call successors, (48)