./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/nested3-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/nested3-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7 --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 0397e1839c0d761fe403b06501425acc9e7bddc9f103e53ae177509d148aabf4 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:55:42,077 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:55:42,080 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:55:42,147 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:55:42,148 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:55:42,153 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:55:42,155 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:55:42,160 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:55:42,163 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:55:42,170 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:55:42,172 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:55:42,174 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:55:42,175 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:55:42,178 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:55:42,180 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:55:42,186 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:55:42,188 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:55:42,189 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:55:42,192 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:55:42,202 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:55:42,204 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:55:42,206 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:55:42,210 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:55:42,211 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:55:42,224 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:55:42,225 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:55:42,225 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:55:42,228 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:55:42,229 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:55:42,231 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:55:42,231 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:55:42,232 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:55:42,235 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:55:42,236 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:55:42,238 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:55:42,239 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:55:42,240 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:55:42,240 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:55:42,240 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:55:42,241 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:55:42,242 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:55:42,243 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 18:55:42,294 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:55:42,294 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:55:42,295 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:55:42,295 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:55:42,304 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:55:42,305 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:55:42,305 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:55:42,306 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:55:42,306 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:55:42,306 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:55:42,307 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:55:42,308 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:55:42,308 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:55:42,308 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:55:42,309 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:55:42,309 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:55:42,309 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:55:42,310 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:55:42,311 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:55:42,312 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:55:42,312 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:55:42,312 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:55:42,312 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:55:42,313 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:55:42,313 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:55:42,313 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:55:42,314 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:55:42,314 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:55:42,314 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:55:42,315 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:55:42,315 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:55:42,315 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:55:42,316 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:55:42,316 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:55:42,316 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:55:42,317 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:55:42,317 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:55:42,317 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:55:42,317 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:55:42,318 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:55:42,318 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:55:42,318 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0397e1839c0d761fe403b06501425acc9e7bddc9f103e53ae177509d148aabf4 [2021-11-25 18:55:42,674 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:55:42,710 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:55:42,713 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:55:42,714 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:55:42,715 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:55:42,717 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/loops-crafted-1/nested3-2.c [2021-11-25 18:55:42,806 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/data/904d6c315/203d5a612c884e76a22ef094148cf9d6/FLAGa60575edd [2021-11-25 18:55:43,388 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:55:43,389 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/sv-benchmarks/c/loops-crafted-1/nested3-2.c [2021-11-25 18:55:43,401 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/data/904d6c315/203d5a612c884e76a22ef094148cf9d6/FLAGa60575edd [2021-11-25 18:55:43,744 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/data/904d6c315/203d5a612c884e76a22ef094148cf9d6 [2021-11-25 18:55:43,749 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:55:43,750 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:55:43,767 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:55:43,768 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:55:43,772 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:55:43,773 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:55:43" (1/1) ... [2021-11-25 18:55:43,774 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7a315416 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:43, skipping insertion in model container [2021-11-25 18:55:43,774 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:55:43" (1/1) ... [2021-11-25 18:55:43,783 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:55:43,799 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:55:44,008 WARN L230 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_5031789a-4dd7-4051-87d6-968c8d4088c6/sv-benchmarks/c/loops-crafted-1/nested3-2.c[321,334] [2021-11-25 18:55:44,028 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:55:44,036 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:55:44,047 WARN L230 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_5031789a-4dd7-4051-87d6-968c8d4088c6/sv-benchmarks/c/loops-crafted-1/nested3-2.c[321,334] [2021-11-25 18:55:44,053 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:55:44,067 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:55:44,068 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:44 WrapperNode [2021-11-25 18:55:44,068 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:55:44,069 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:55:44,070 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:55:44,070 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:55:44,079 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:44" (1/1) ... [2021-11-25 18:55:44,087 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:44" (1/1) ... [2021-11-25 18:55:44,112 INFO L137 Inliner]: procedures = 12, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 42 [2021-11-25 18:55:44,116 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:55:44,118 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:55:44,118 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:55:44,118 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:55:44,129 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:44" (1/1) ... [2021-11-25 18:55:44,130 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:44" (1/1) ... [2021-11-25 18:55:44,143 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:44" (1/1) ... [2021-11-25 18:55:44,143 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:44" (1/1) ... [2021-11-25 18:55:44,147 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:44" (1/1) ... [2021-11-25 18:55:44,152 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:44" (1/1) ... [2021-11-25 18:55:44,153 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:44" (1/1) ... [2021-11-25 18:55:44,163 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:55:44,165 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:55:44,165 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:55:44,166 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:55:44,167 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:44" (1/1) ... [2021-11-25 18:55:44,175 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:55:44,189 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:55:44,219 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:55:44,234 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:55:44,284 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:55:44,284 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:55:44,284 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:55:44,284 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:55:44,284 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-25 18:55:44,285 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-25 18:55:44,360 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:55:44,362 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:55:44,513 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:55:44,535 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:55:44,535 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-25 18:55:44,538 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:55:44 BoogieIcfgContainer [2021-11-25 18:55:44,538 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:55:44,540 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:55:44,540 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:55:44,544 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:55:44,544 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:55:43" (1/3) ... [2021-11-25 18:55:44,545 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16c60bac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:55:44, skipping insertion in model container [2021-11-25 18:55:44,545 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:55:44" (2/3) ... [2021-11-25 18:55:44,546 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16c60bac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:55:44, skipping insertion in model container [2021-11-25 18:55:44,546 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:55:44" (3/3) ... [2021-11-25 18:55:44,548 INFO L111 eAbstractionObserver]: Analyzing ICFG nested3-2.c [2021-11-25 18:55:44,554 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:55:44,554 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 18:55:44,625 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:55:44,639 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 18:55:44,639 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 18:55:44,678 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 18:55:44,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 18:55:44,683 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:55:44,684 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 18:55:44,685 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:55:44,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:55:44,699 INFO L85 PathProgramCache]: Analyzing trace with hash -1481844777, now seen corresponding path program 1 times [2021-11-25 18:55:44,710 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:55:44,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [968963136] [2021-11-25 18:55:44,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:44,712 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:55:44,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:45,056 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:55:45,061 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:55:45,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [968963136] [2021-11-25 18:55:45,062 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [968963136] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:55:45,063 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:55:45,063 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 18:55:45,065 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [455975775] [2021-11-25 18:55:45,068 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:55:45,087 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:55:45,088 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:55:45,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:55:45,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:55:45,125 INFO L87 Difference]: Start difference. First operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:55:45,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:55:45,189 INFO L93 Difference]: Finished difference Result 40 states and 60 transitions. [2021-11-25 18:55:45,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:55:45,192 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-25 18:55:45,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:55:45,202 INFO L225 Difference]: With dead ends: 40 [2021-11-25 18:55:45,202 INFO L226 Difference]: Without dead ends: 22 [2021-11-25 18:55:45,206 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:55:45,219 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 6 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:55:45,220 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 30 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:55:45,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-25 18:55:45,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 16. [2021-11-25 18:55:45,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 18:55:45,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2021-11-25 18:55:45,271 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 6 [2021-11-25 18:55:45,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:55:45,271 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2021-11-25 18:55:45,272 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:55:45,272 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2021-11-25 18:55:45,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 18:55:45,273 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:55:45,273 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:55:45,273 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 18:55:45,274 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:55:45,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:55:45,275 INFO L85 PathProgramCache]: Analyzing trace with hash -317560400, now seen corresponding path program 1 times [2021-11-25 18:55:45,275 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:55:45,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1951139719] [2021-11-25 18:55:45,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:45,276 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:55:45,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:45,365 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:55:45,366 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:55:45,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1951139719] [2021-11-25 18:55:45,367 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1951139719] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:55:45,367 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:55:45,367 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:55:45,367 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [433144096] [2021-11-25 18:55:45,368 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:55:45,369 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:55:45,369 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:55:45,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:55:45,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:55:45,371 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:55:45,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:55:45,417 INFO L93 Difference]: Finished difference Result 34 states and 45 transitions. [2021-11-25 18:55:45,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:55:45,418 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-25 18:55:45,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:55:45,419 INFO L225 Difference]: With dead ends: 34 [2021-11-25 18:55:45,420 INFO L226 Difference]: Without dead ends: 20 [2021-11-25 18:55:45,420 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:55:45,423 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 3 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:55:45,424 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 26 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:55:45,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-25 18:55:45,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2021-11-25 18:55:45,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 18:55:45,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2021-11-25 18:55:45,433 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 7 [2021-11-25 18:55:45,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:55:45,434 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2021-11-25 18:55:45,434 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:55:45,447 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2021-11-25 18:55:45,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 18:55:45,447 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:55:45,448 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:55:45,448 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 18:55:45,448 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:55:45,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:55:45,450 INFO L85 PathProgramCache]: Analyzing trace with hash 1616784915, now seen corresponding path program 1 times [2021-11-25 18:55:45,450 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:55:45,450 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [347072690] [2021-11-25 18:55:45,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:45,451 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:55:45,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:45,570 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:55:45,570 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:55:45,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [347072690] [2021-11-25 18:55:45,571 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [347072690] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:55:45,571 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:55:45,571 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:55:45,572 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084653291] [2021-11-25 18:55:45,572 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:55:45,572 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:55:45,573 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:55:45,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:55:45,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:55:45,574 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:55:45,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:55:45,595 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2021-11-25 18:55:45,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:55:45,596 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-25 18:55:45,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:55:45,597 INFO L225 Difference]: With dead ends: 34 [2021-11-25 18:55:45,598 INFO L226 Difference]: Without dead ends: 19 [2021-11-25 18:55:45,598 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:55:45,601 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 1 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:55:45,602 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 27 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:55:45,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-25 18:55:45,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2021-11-25 18:55:45,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 18:55:45,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2021-11-25 18:55:45,609 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 8 [2021-11-25 18:55:45,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:55:45,610 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2021-11-25 18:55:45,610 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:55:45,614 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2021-11-25 18:55:45,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-25 18:55:45,615 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:55:45,615 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:55:45,615 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 18:55:45,617 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:55:45,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:55:45,619 INFO L85 PathProgramCache]: Analyzing trace with hash 1740086088, now seen corresponding path program 1 times [2021-11-25 18:55:45,619 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:55:45,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205149482] [2021-11-25 18:55:45,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:45,621 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:55:45,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:45,779 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:55:45,780 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:55:45,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [205149482] [2021-11-25 18:55:45,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [205149482] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:55:45,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [217771894] [2021-11-25 18:55:45,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:45,782 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:55:45,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:55:45,784 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:55:45,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 18:55:45,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:45,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 18:55:45,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:45,933 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:55:45,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:55:45,982 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:55:45,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [217771894] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:55:45,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1462824753] [2021-11-25 18:55:46,009 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 18:55:46,009 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:55:46,015 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:55:46,028 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:55:46,029 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:55:46,404 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2021-11-25 18:55:46,469 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:55:46,725 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '328#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:55:46,725 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:55:46,725 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:55:46,725 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-25 18:55:46,726 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561408181] [2021-11-25 18:55:46,726 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:55:46,727 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 18:55:46,727 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:55:46,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 18:55:46,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2021-11-25 18:55:46,728 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:55:46,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:55:46,808 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2021-11-25 18:55:46,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 18:55:46,809 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-25 18:55:46,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:55:46,810 INFO L225 Difference]: With dead ends: 38 [2021-11-25 18:55:46,810 INFO L226 Difference]: Without dead ends: 22 [2021-11-25 18:55:46,811 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2021-11-25 18:55:46,813 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 3 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:55:46,814 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 53 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:55:46,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-25 18:55:46,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-11-25 18:55:46,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 18:55:46,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-11-25 18:55:46,821 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 9 [2021-11-25 18:55:46,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:55:46,822 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-11-25 18:55:46,822 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:55:46,822 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-11-25 18:55:46,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-25 18:55:46,823 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:55:46,823 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:55:46,870 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 18:55:47,024 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:55:47,024 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:55:47,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:55:47,025 INFO L85 PathProgramCache]: Analyzing trace with hash 569004883, now seen corresponding path program 2 times [2021-11-25 18:55:47,026 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:55:47,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1271575308] [2021-11-25 18:55:47,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:47,026 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:55:47,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:47,165 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:55:47,165 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:55:47,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1271575308] [2021-11-25 18:55:47,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1271575308] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:55:47,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1009947118] [2021-11-25 18:55:47,166 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:55:47,166 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:55:47,167 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:55:47,168 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:55:47,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 18:55:47,224 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 18:55:47,225 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:55:47,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 18:55:47,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:47,409 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:55:47,409 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:55:47,561 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:55:47,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1009947118] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:55:47,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [527479094] [2021-11-25 18:55:47,565 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 18:55:47,566 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:55:47,566 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:55:47,566 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:55:47,567 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:55:47,714 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2021-11-25 18:55:47,750 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:55:48,093 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '511#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:55:48,093 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:55:48,094 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:55:48,094 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 8] total 14 [2021-11-25 18:55:48,094 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949565227] [2021-11-25 18:55:48,094 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:55:48,095 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 18:55:48,095 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:55:48,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 18:55:48,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=325, Unknown=0, NotChecked=0, Total=380 [2021-11-25 18:55:48,097 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 14 states, 14 states have (on average 1.5) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (3), 2 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:55:48,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:55:48,353 INFO L93 Difference]: Finished difference Result 73 states and 97 transitions. [2021-11-25 18:55:48,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 18:55:48,354 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.5) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (3), 2 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-25 18:55:48,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:55:48,357 INFO L225 Difference]: With dead ends: 73 [2021-11-25 18:55:48,357 INFO L226 Difference]: Without dead ends: 54 [2021-11-25 18:55:48,358 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 21 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2021-11-25 18:55:48,359 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 31 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 246 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:55:48,360 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 246 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 220 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:55:48,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-25 18:55:48,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 30. [2021-11-25 18:55:48,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 25 states have internal predecessors, (30), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 18:55:48,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2021-11-25 18:55:48,373 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 12 [2021-11-25 18:55:48,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:55:48,373 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2021-11-25 18:55:48,374 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.5) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (3), 2 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:55:48,374 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2021-11-25 18:55:48,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 18:55:48,375 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:55:48,375 INFO L514 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:55:48,421 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 18:55:48,593 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:55:48,594 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:55:48,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:55:48,595 INFO L85 PathProgramCache]: Analyzing trace with hash -676323832, now seen corresponding path program 3 times [2021-11-25 18:55:48,595 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:55:48,595 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1864478566] [2021-11-25 18:55:48,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:48,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:55:48,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:48,720 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:55:48,720 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:55:48,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1864478566] [2021-11-25 18:55:48,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1864478566] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:55:48,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [689249143] [2021-11-25 18:55:48,728 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:55:48,728 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:55:48,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:55:48,731 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:55:48,736 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 18:55:48,791 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:55:48,792 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:55:48,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 18:55:48,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:48,898 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:55:48,898 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:55:49,050 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:55:49,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [689249143] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:55:49,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [901741102] [2021-11-25 18:55:49,053 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 18:55:49,053 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:55:49,054 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:55:49,054 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:55:49,054 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:55:49,180 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2021-11-25 18:55:49,215 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:55:49,507 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '777#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:55:49,508 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:55:49,508 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:55:49,508 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2021-11-25 18:55:49,508 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452208353] [2021-11-25 18:55:49,508 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:55:49,509 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-25 18:55:49,509 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:55:49,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-25 18:55:49,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=320, Unknown=0, NotChecked=0, Total=420 [2021-11-25 18:55:49,510 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand has 15 states, 15 states have (on average 1.4) internal successors, (21), 15 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:55:50,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:55:50,640 INFO L93 Difference]: Finished difference Result 66 states and 87 transitions. [2021-11-25 18:55:50,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 18:55:50,641 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.4) internal successors, (21), 15 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-25 18:55:50,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:55:50,643 INFO L225 Difference]: With dead ends: 66 [2021-11-25 18:55:50,643 INFO L226 Difference]: Without dead ends: 38 [2021-11-25 18:55:50,644 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=180, Invalid=470, Unknown=0, NotChecked=0, Total=650 [2021-11-25 18:55:50,645 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 2 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:55:50,646 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 109 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:55:50,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-25 18:55:50,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2021-11-25 18:55:50,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 32 states have internal predecessors, (37), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 18:55:50,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions. [2021-11-25 18:55:50,655 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 13 [2021-11-25 18:55:50,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:55:50,656 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 44 transitions. [2021-11-25 18:55:50,656 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.4) internal successors, (21), 15 states have internal predecessors, (21), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:55:50,656 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions. [2021-11-25 18:55:50,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-25 18:55:50,657 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:55:50,657 INFO L514 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:55:50,702 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 18:55:50,882 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-25 18:55:50,883 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:55:50,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:55:50,883 INFO L85 PathProgramCache]: Analyzing trace with hash -1445788792, now seen corresponding path program 4 times [2021-11-25 18:55:50,884 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:55:50,884 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [583083832] [2021-11-25 18:55:50,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:50,884 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:55:50,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:51,208 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:55:51,209 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:55:51,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [583083832] [2021-11-25 18:55:51,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [583083832] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:55:51,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1318490656] [2021-11-25 18:55:51,209 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:55:51,210 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:55:51,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:55:51,211 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:55:51,231 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 18:55:51,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:51,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-25 18:55:51,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:51,435 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:55:51,450 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:55:52,052 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:55:52,053 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1318490656] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:55:52,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [891656396] [2021-11-25 18:55:52,055 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 18:55:52,056 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:55:52,056 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:55:52,057 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:55:52,057 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:55:52,153 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2021-11-25 18:55:52,183 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:55:52,618 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1118#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:55:52,618 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:55:52,618 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:55:52,618 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2021-11-25 18:55:52,618 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092551265] [2021-11-25 18:55:52,618 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:55:52,619 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-25 18:55:52,619 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:55:52,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-25 18:55:52,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=316, Invalid=1016, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 18:55:52,621 INFO L87 Difference]: Start difference. First operand 37 states and 44 transitions. Second operand has 31 states, 31 states have (on average 1.1935483870967742) internal successors, (37), 31 states have internal predecessors, (37), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:56:13,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:56:13,541 INFO L93 Difference]: Finished difference Result 89 states and 119 transitions. [2021-11-25 18:56:13,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-25 18:56:13,542 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.1935483870967742) internal successors, (37), 31 states have internal predecessors, (37), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-25 18:56:13,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:56:13,543 INFO L225 Difference]: With dead ends: 89 [2021-11-25 18:56:13,543 INFO L226 Difference]: Without dead ends: 54 [2021-11-25 18:56:13,545 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 336 ImplicationChecksByTransitivity, 21.7s TimeCoverageRelationStatistics Valid=732, Invalid=1718, Unknown=0, NotChecked=0, Total=2450 [2021-11-25 18:56:13,546 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 10 mSDsluCounter, 251 mSDsCounter, 0 mSdLazyCounter, 288 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 342 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 288 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:56:13,547 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 233 Invalid, 342 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 288 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:56:13,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-25 18:56:13,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2021-11-25 18:56:13,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 46 states have (on average 1.1521739130434783) internal successors, (53), 48 states have internal predecessors, (53), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 18:56:13,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 60 transitions. [2021-11-25 18:56:13,559 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 60 transitions. Word has length 21 [2021-11-25 18:56:13,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:56:13,559 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 60 transitions. [2021-11-25 18:56:13,559 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.1935483870967742) internal successors, (37), 31 states have internal predecessors, (37), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:56:13,560 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 60 transitions. [2021-11-25 18:56:13,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-25 18:56:13,561 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:56:13,561 INFO L514 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:56:13,603 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 18:56:13,784 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:56:13,784 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:56:13,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:56:13,785 INFO L85 PathProgramCache]: Analyzing trace with hash 706760328, now seen corresponding path program 5 times [2021-11-25 18:56:13,785 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:56:13,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1855834044] [2021-11-25 18:56:13,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:56:13,785 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:56:13,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:56:14,741 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:56:14,742 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:56:14,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1855834044] [2021-11-25 18:56:14,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1855834044] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:56:14,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1120288482] [2021-11-25 18:56:14,742 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:56:14,743 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:56:14,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:56:14,747 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:56:14,766 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5031789a-4dd7-4051-87d6-968c8d4088c6/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process