./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/gcd_4+newton_3_7.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/gcd_4+newton_3_7.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V --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 87bc0d62bd0ac2c8f0b3bcd924815b04302ef88419a4b535524b284cb471b329 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:06:33,122 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:06:33,125 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:06:33,174 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:06:33,176 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:06:33,178 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:06:33,180 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:06:33,182 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:06:33,184 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:06:33,185 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:06:33,187 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:06:33,188 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:06:33,189 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:06:33,191 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:06:33,192 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:06:33,194 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:06:33,195 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:06:33,197 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:06:33,199 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:06:33,202 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:06:33,204 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:06:33,205 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:06:33,207 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:06:33,208 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:06:33,212 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:06:33,213 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:06:33,213 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:06:33,214 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:06:33,215 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:06:33,216 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:06:33,217 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:06:33,218 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:06:33,219 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:06:33,220 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:06:33,221 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:06:33,221 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:06:33,222 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:06:33,223 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:06:33,223 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:06:33,225 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:06:33,225 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:06:33,227 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:06:33,258 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:06:33,259 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:06:33,259 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:06:33,259 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:06:33,260 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:06:33,261 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:06:33,261 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:06:33,261 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:06:33,262 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:06:33,262 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:06:33,263 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:06:33,263 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:06:33,269 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:06:33,271 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:06:33,271 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:06:33,271 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:06:33,271 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:06:33,272 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:06:33,273 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:06:33,273 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:06:33,273 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:06:33,274 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:06:33,274 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:06:33,274 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:06:33,275 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:06:33,275 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:06:33,276 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:06:33,277 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:06:33,277 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:06:33,278 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:06:33,278 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:06:33,278 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:06:33,278 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:06:33,279 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:06:33,279 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:06:33,279 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:06:33,280 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:06:33,281 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:06:33,281 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:06:33,281 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:06:33,281 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:06:33,281 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_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 87bc0d62bd0ac2c8f0b3bcd924815b04302ef88419a4b535524b284cb471b329 [2021-11-23 03:06:33,566 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:06:33,594 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:06:33,598 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:06:33,599 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:06:33,600 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:06:33,602 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/combinations/gcd_4+newton_3_7.i [2021-11-23 03:06:33,684 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/data/3cd761c36/b25b099cf2c74cf4909e13c0f88eb80b/FLAG1b5ea3c2e [2021-11-23 03:06:34,205 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:06:34,205 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/sv-benchmarks/c/combinations/gcd_4+newton_3_7.i [2021-11-23 03:06:34,217 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/data/3cd761c36/b25b099cf2c74cf4909e13c0f88eb80b/FLAG1b5ea3c2e [2021-11-23 03:06:34,535 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/data/3cd761c36/b25b099cf2c74cf4909e13c0f88eb80b [2021-11-23 03:06:34,539 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:06:34,540 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:06:34,542 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:06:34,542 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:06:34,546 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:06:34,547 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:06:34" (1/1) ... [2021-11-23 03:06:34,548 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7db21b1c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:34, skipping insertion in model container [2021-11-23 03:06:34,548 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:06:34" (1/1) ... [2021-11-23 03:06:34,565 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:06:34,588 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:06:34,768 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_66565ecf-02b4-4615-82f9-52b14759b82e/sv-benchmarks/c/combinations/gcd_4+newton_3_7.i[1224,1237] [2021-11-23 03:06:34,797 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_66565ecf-02b4-4615-82f9-52b14759b82e/sv-benchmarks/c/combinations/gcd_4+newton_3_7.i[2848,2861] [2021-11-23 03:06:34,798 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:06:34,809 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:06:34,834 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_66565ecf-02b4-4615-82f9-52b14759b82e/sv-benchmarks/c/combinations/gcd_4+newton_3_7.i[1224,1237] [2021-11-23 03:06:34,852 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_66565ecf-02b4-4615-82f9-52b14759b82e/sv-benchmarks/c/combinations/gcd_4+newton_3_7.i[2848,2861] [2021-11-23 03:06:34,853 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:06:34,868 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:06:34,868 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:34 WrapperNode [2021-11-23 03:06:34,868 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:06:34,869 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:06:34,869 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:06:34,870 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:06:34,878 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:34" (1/1) ... [2021-11-23 03:06:34,886 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:34" (1/1) ... [2021-11-23 03:06:34,909 INFO L137 Inliner]: procedures = 27, calls = 20, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 77 [2021-11-23 03:06:34,909 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:06:34,910 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:06:34,910 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:06:34,910 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:06:34,919 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:34" (1/1) ... [2021-11-23 03:06:34,920 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:34" (1/1) ... [2021-11-23 03:06:34,922 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:34" (1/1) ... [2021-11-23 03:06:34,922 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:34" (1/1) ... [2021-11-23 03:06:34,929 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:34" (1/1) ... [2021-11-23 03:06:34,933 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:34" (1/1) ... [2021-11-23 03:06:34,935 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:34" (1/1) ... [2021-11-23 03:06:34,937 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:06:34,938 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:06:34,938 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:06:34,939 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:06:34,952 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:34" (1/1) ... [2021-11-23 03:06:34,960 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:06:34,979 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:06:35,002 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:06:35,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:06:35,053 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:06:35,053 INFO L130 BoogieDeclarations]: Found specification of procedure fp [2021-11-23 03:06:35,054 INFO L138 BoogieDeclarations]: Found implementation of procedure fp [2021-11-23 03:06:35,054 INFO L130 BoogieDeclarations]: Found specification of procedure f [2021-11-23 03:06:35,054 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2021-11-23 03:06:35,054 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:06:35,054 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:06:35,054 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:06:35,054 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-23 03:06:35,055 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-23 03:06:35,135 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:06:35,136 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:06:35,337 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:06:35,397 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:06:35,397 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 03:06:35,400 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:06:35 BoogieIcfgContainer [2021-11-23 03:06:35,400 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:06:35,402 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:06:35,402 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:06:35,406 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:06:35,406 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:06:34" (1/3) ... [2021-11-23 03:06:35,407 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e1593f2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:06:35, skipping insertion in model container [2021-11-23 03:06:35,407 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:06:34" (2/3) ... [2021-11-23 03:06:35,407 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e1593f2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:06:35, skipping insertion in model container [2021-11-23 03:06:35,408 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:06:35" (3/3) ... [2021-11-23 03:06:35,409 INFO L111 eAbstractionObserver]: Analyzing ICFG gcd_4+newton_3_7.i [2021-11-23 03:06:35,414 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:06:35,415 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 03:06:35,462 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:06:35,470 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 [2021-11-23 03:06:35,470 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 03:06:35,488 INFO L276 IsEmpty]: Start isEmpty. Operand has 34 states, 19 states have (on average 1.368421052631579) internal successors, (26), 21 states have internal predecessors, (26), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-23 03:06:35,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 03:06:35,494 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:06:35,494 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:06:35,495 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:06:35,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:06:35,501 INFO L85 PathProgramCache]: Analyzing trace with hash 259234294, now seen corresponding path program 1 times [2021-11-23 03:06:35,510 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:06:35,511 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1255744659] [2021-11-23 03:06:35,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:35,512 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:06:35,608 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:06:35,609 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2106905756] [2021-11-23 03:06:35,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:35,610 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:35,610 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:06:35,612 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:06:35,621 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:06:35,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:06:35,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:06:35,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:06:35,839 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:06:35,840 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:06:35,840 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:06:35,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1255744659] [2021-11-23 03:06:35,841 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:06:35,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2106905756] [2021-11-23 03:06:35,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2106905756] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:06:35,842 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:06:35,842 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:06:35,845 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [87745409] [2021-11-23 03:06:35,845 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:06:35,850 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:06:35,850 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:06:35,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:06:35,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:06:35,889 INFO L87 Difference]: Start difference. First operand has 34 states, 19 states have (on average 1.368421052631579) internal successors, (26), 21 states have internal predecessors, (26), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) 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) [2021-11-23 03:06:35,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:06:35,945 INFO L93 Difference]: Finished difference Result 56 states and 77 transitions. [2021-11-23 03:06:35,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:06:35,948 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 [2021-11-23 03:06:35,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:06:35,956 INFO L225 Difference]: With dead ends: 56 [2021-11-23 03:06:35,957 INFO L226 Difference]: Without dead ends: 35 [2021-11-23 03:06:35,960 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:06:35,964 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 5 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:06:35,965 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 63 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:06:35,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-23 03:06:36,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2021-11-23 03:06:36,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 16 states have (on average 1.1875) internal successors, (19), 18 states have internal predecessors, (19), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-23 03:06:36,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2021-11-23 03:06:36,010 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 8 [2021-11-23 03:06:36,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:06:36,011 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2021-11-23 03:06:36,011 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) [2021-11-23 03:06:36,011 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2021-11-23 03:06:36,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-23 03:06:36,013 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:06:36,013 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:06:36,052 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 03:06:36,236 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-23 03:06:36,236 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:06:36,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:06:36,237 INFO L85 PathProgramCache]: Analyzing trace with hash -659222671, now seen corresponding path program 1 times [2021-11-23 03:06:36,237 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:06:36,238 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1228480348] [2021-11-23 03:06:36,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:36,238 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:06:36,254 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:06:36,255 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1419902065] [2021-11-23 03:06:36,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:36,256 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:36,256 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:06:36,257 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:06:36,283 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:06:36,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:06:36,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:06:36,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:06:36,419 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:06:36,420 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:06:36,420 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:06:36,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1228480348] [2021-11-23 03:06:36,420 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:06:36,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1419902065] [2021-11-23 03:06:36,423 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1419902065] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:06:36,423 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:06:36,423 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:06:36,423 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [93697174] [2021-11-23 03:06:36,424 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:06:36,426 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:06:36,426 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:06:36,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:06:36,427 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:06:36,428 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:06:36,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:06:36,450 INFO L93 Difference]: Finished difference Result 41 states and 49 transitions. [2021-11-23 03:06:36,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:06:36,451 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-23 03:06:36,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:06:36,453 INFO L225 Difference]: With dead ends: 41 [2021-11-23 03:06:36,453 INFO L226 Difference]: Without dead ends: 31 [2021-11-23 03:06:36,454 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:06:36,456 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 0 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 57 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 [2021-11-23 03:06:36,457 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 57 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:06:36,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-23 03:06:36,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-11-23 03:06:36,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 19 states have internal predecessors, (20), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-23 03:06:36,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2021-11-23 03:06:36,466 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 9 [2021-11-23 03:06:36,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:06:36,466 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2021-11-23 03:06:36,467 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:06:36,467 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2021-11-23 03:06:36,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-23 03:06:36,468 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:06:36,468 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:06:36,502 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:06:36,685 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-23 03:06:36,686 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:06:36,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:06:36,686 INFO L85 PathProgramCache]: Analyzing trace with hash -239223413, now seen corresponding path program 1 times [2021-11-23 03:06:36,686 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:06:36,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1518508231] [2021-11-23 03:06:36,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:36,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:06:36,718 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:06:36,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [307426954] [2021-11-23 03:06:36,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:36,719 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:36,719 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:06:36,728 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:06:36,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:06:36,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:06:36,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 03:06:36,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:06:36,861 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:06:36,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:06:36,928 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:06:36,928 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:06:36,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1518508231] [2021-11-23 03:06:36,928 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:06:36,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [307426954] [2021-11-23 03:06:36,929 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [307426954] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:06:36,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2033648609] [2021-11-23 03:06:36,952 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-23 03:06:36,953 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:06:36,958 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:06:36,964 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:06:36,965 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:06:37,463 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2021-11-23 03:06:37,506 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:06:37,901 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '384#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:06:37,902 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:06:37,902 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:06:37,902 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2021-11-23 03:06:37,902 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957045820] [2021-11-23 03:06:37,902 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:06:37,903 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:06:37,903 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:06:37,903 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:06:37,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2021-11-23 03:06:37,904 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 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) [2021-11-23 03:06:37,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:06:37,973 INFO L93 Difference]: Finished difference Result 43 states and 52 transitions. [2021-11-23 03:06:37,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:06:37,974 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 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 10 [2021-11-23 03:06:37,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:06:37,975 INFO L225 Difference]: With dead ends: 43 [2021-11-23 03:06:37,975 INFO L226 Difference]: Without dead ends: 33 [2021-11-23 03:06:37,976 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2021-11-23 03:06:37,977 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 3 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:06:37,978 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 105 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:06:37,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-23 03:06:37,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-11-23 03:06:37,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 21 states have internal predecessors, (22), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-23 03:06:37,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2021-11-23 03:06:37,986 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 10 [2021-11-23 03:06:37,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:06:37,987 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2021-11-23 03:06:37,987 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 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) [2021-11-23 03:06:37,987 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2021-11-23 03:06:37,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-23 03:06:37,988 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:06:37,988 INFO L514 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:06:38,027 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:06:38,203 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:38,204 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:06:38,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:06:38,205 INFO L85 PathProgramCache]: Analyzing trace with hash -211787189, now seen corresponding path program 2 times [2021-11-23 03:06:38,205 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:06:38,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [227535972] [2021-11-23 03:06:38,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:38,205 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:06:38,221 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:06:38,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [191355680] [2021-11-23 03:06:38,222 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:06:38,222 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:38,222 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:06:38,225 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:06:38,234 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:06:38,276 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 03:06:38,276 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:06:38,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 03:06:38,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:06:38,385 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:06:38,385 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:06:38,656 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:06:38,657 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:06:38,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [227535972] [2021-11-23 03:06:38,658 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:06:38,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [191355680] [2021-11-23 03:06:38,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [191355680] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:06:38,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1173392101] [2021-11-23 03:06:38,670 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-23 03:06:38,670 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:06:38,671 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:06:38,671 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:06:38,673 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:06:38,958 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2021-11-23 03:06:38,991 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:06:39,438 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '585#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:06:39,438 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:06:39,438 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:06:39,438 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2021-11-23 03:06:39,439 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960576837] [2021-11-23 03:06:39,439 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:06:39,439 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 03:06:39,439 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:06:39,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 03:06:39,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=236, Unknown=0, NotChecked=0, Total=306 [2021-11-23 03:06:39,441 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand has 10 states, 10 states have (on average 1.7) internal successors, (17), 10 states have internal predecessors, (17), 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) [2021-11-23 03:06:39,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:06:39,587 INFO L93 Difference]: Finished difference Result 44 states and 52 transitions. [2021-11-23 03:06:39,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 03:06:39,589 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.7) internal successors, (17), 10 states have internal predecessors, (17), 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 12 [2021-11-23 03:06:39,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:06:39,589 INFO L225 Difference]: With dead ends: 44 [2021-11-23 03:06:39,590 INFO L226 Difference]: Without dead ends: 34 [2021-11-23 03:06:39,590 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=79, Invalid=263, Unknown=0, NotChecked=0, Total=342 [2021-11-23 03:06:39,592 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 7 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:06:39,592 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 156 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:06:39,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-23 03:06:39,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-11-23 03:06:39,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 20 states have (on average 1.15) internal successors, (23), 22 states have internal predecessors, (23), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-23 03:06:39,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2021-11-23 03:06:39,603 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 12 [2021-11-23 03:06:39,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:06:39,603 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2021-11-23 03:06:39,603 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.7) internal successors, (17), 10 states have internal predecessors, (17), 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) [2021-11-23 03:06:39,604 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2021-11-23 03:06:39,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-23 03:06:39,605 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:06:39,605 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:06:39,649 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 03:06:39,818 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:39,818 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:06:39,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:06:39,818 INFO L85 PathProgramCache]: Analyzing trace with hash 746374641, now seen corresponding path program 3 times [2021-11-23 03:06:39,819 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:06:39,819 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2012882644] [2021-11-23 03:06:39,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:39,819 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:06:39,839 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:06:39,839 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1758039405] [2021-11-23 03:06:39,839 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:06:39,839 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:39,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:06:39,841 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:06:39,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 03:06:39,921 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:06:39,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:06:39,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 03:06:39,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:06:40,013 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:06:40,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:06:40,455 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:06:40,455 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:06:40,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2012882644] [2021-11-23 03:06:40,456 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:06:40,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1758039405] [2021-11-23 03:06:40,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1758039405] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:06:40,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1452343516] [2021-11-23 03:06:40,459 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-23 03:06:40,459 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:06:40,460 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:06:40,460 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:06:40,460 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:06:40,693 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2021-11-23 03:06:40,718 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:06:41,203 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '798#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:06:41,204 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:06:41,204 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:06:41,204 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-11-23 03:06:41,204 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865699185] [2021-11-23 03:06:41,204 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:06:41,205 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-23 03:06:41,205 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:06:41,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-23 03:06:41,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=304, Unknown=0, NotChecked=0, Total=380 [2021-11-23 03:06:41,206 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 states have internal predecessors, (19), 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) [2021-11-23 03:06:41,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:06:41,655 INFO L93 Difference]: Finished difference Result 49 states and 61 transitions. [2021-11-23 03:06:41,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 03:06:41,658 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 states have internal predecessors, (19), 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 [2021-11-23 03:06:41,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:06:41,659 INFO L225 Difference]: With dead ends: 49 [2021-11-23 03:06:41,659 INFO L226 Difference]: Without dead ends: 39 [2021-11-23 03:06:41,660 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=123, Invalid=477, Unknown=0, NotChecked=0, Total=600 [2021-11-23 03:06:41,661 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 11 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:06:41,662 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 154 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:06:41,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-23 03:06:41,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-11-23 03:06:41,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 25 states have (on average 1.16) internal successors, (29), 27 states have internal predecessors, (29), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-23 03:06:41,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 46 transitions. [2021-11-23 03:06:41,686 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 46 transitions. Word has length 13 [2021-11-23 03:06:41,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:06:41,687 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 46 transitions. [2021-11-23 03:06:41,687 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 states have internal predecessors, (19), 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) [2021-11-23 03:06:41,687 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 46 transitions. [2021-11-23 03:06:41,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-23 03:06:41,688 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:06:41,689 INFO L514 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:06:41,725 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 03:06:41,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:41,916 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:06:41,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:06:41,916 INFO L85 PathProgramCache]: Analyzing trace with hash 384620299, now seen corresponding path program 4 times [2021-11-23 03:06:41,916 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:06:41,917 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [747481330] [2021-11-23 03:06:41,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:41,917 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:06:41,935 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:06:41,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [67381061] [2021-11-23 03:06:41,936 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:06:41,936 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:41,936 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:06:41,937 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:06:41,959 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 03:06:41,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:06:41,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 03:06:41,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:06:42,245 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:06:42,245 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:06:52,592 WARN L227 SmtUtils]: Spent 7.43s on a formula simplification that was a NOOP. DAG size: 47 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:07:34,215 WARN L227 SmtUtils]: Spent 37.39s on a formula simplification that was a NOOP. DAG size: 83 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:07:52,414 WARN L860 $PredicateComparison]: unable to prove that (let ((.cse0 (* |c_ULTIMATE.start_gcd_test_~a#1| (- 2))) (.cse4 (* 3 |c_ULTIMATE.start_gcd_test_~a#1|)) (.cse9 (* 2 |c_ULTIMATE.start_gcd_test_~a#1|)) (.cse7 (* |c_ULTIMATE.start_gcd_test_~b#1| 2)) (.cse1 (* |c_ULTIMATE.start_gcd_test_~b#1| 3)) (.cse13 (* 5 |c_ULTIMATE.start_gcd_test_~b#1|)) (.cse3 (* 5 |c_ULTIMATE.start_gcd_test_~a#1|)) (.cse6 (* |c_ULTIMATE.start_gcd_test_~a#1| (- 1))) (.cse8 (* 4 |c_ULTIMATE.start_gcd_test_~a#1|)) (.cse12 (* |c_ULTIMATE.start_gcd_test_~a#1| (- 3)))) (and (or (<= |c_ULTIMATE.start_gcd_test_~a#1| |c_ULTIMATE.start_gcd_test_~b#1|) (let ((.cse2 (* 7 |c_ULTIMATE.start_gcd_test_~b#1|)) (.cse5 (* |c_ULTIMATE.start_gcd_test_~b#1| 5)) (.cse11 (* 8 |c_ULTIMATE.start_gcd_test_~b#1|)) (.cse10 (* |c_ULTIMATE.start_gcd_test_~b#1| 4))) (and (or (= (mod |c_ULTIMATE.start_main1_~x~0#1| (+ .cse0 .cse1)) 0) (not (= .cse2 .cse3))) (or (not (= .cse4 .cse2)) (= (mod |c_ULTIMATE.start_main1_~x~0#1| (+ .cse0 .cse5)) 0)) (or (= (mod |c_ULTIMATE.start_main1_~x~0#1| (+ .cse6 .cse7)) 0) (not (= .cse2 .cse8))) (or (not (= .cse2 .cse9)) (= (mod |c_ULTIMATE.start_main1_~x~0#1| (+ .cse6 .cse10)) 0)) (or (not (= .cse11 .cse3)) (= (mod |c_ULTIMATE.start_main1_~x~0#1| (+ .cse5 .cse12)) 0)) (or (= (mod |c_ULTIMATE.start_main1_~x~0#1| (+ .cse6 .cse1)) 0) (not (= .cse4 .cse11))) (or (= (mod |c_ULTIMATE.start_main1_~x~0#1| (+ .cse12 .cse10)) 0) (not (= .cse13 .cse8))) (or (not (= |c_ULTIMATE.start_gcd_test_~a#1| .cse13)) (= (mod |c_ULTIMATE.start_main1_~x~0#1| |c_ULTIMATE.start_gcd_test_~b#1|) 0))))) (or (< |c_ULTIMATE.start_gcd_test_~b#1| |c_ULTIMATE.start_gcd_test_~a#1|) (let ((.cse17 (* |c_ULTIMATE.start_gcd_test_~a#1| (- 5))) (.cse15 (* 8 |c_ULTIMATE.start_gcd_test_~a#1|)) (.cse14 (* |c_ULTIMATE.start_gcd_test_~a#1| (- 4))) (.cse18 (* 7 |c_ULTIMATE.start_gcd_test_~a#1|))) (and (or (= |c_ULTIMATE.start_gcd_test_~b#1| .cse8) (= (mod |c_ULTIMATE.start_main1_~x~0#1| (+ |c_ULTIMATE.start_gcd_test_~b#1| .cse14)) 0) (not (= |c_ULTIMATE.start_gcd_test_~b#1| .cse3))) (or (let ((.cse16 (* 3 |c_ULTIMATE.start_gcd_test_~b#1|))) (and (or (not (= .cse15 .cse16)) (= (mod |c_ULTIMATE.start_main1_~x~0#1| (+ .cse17 .cse7)) 0)) (or (= (mod |c_ULTIMATE.start_main1_~x~0#1| (+ |c_ULTIMATE.start_gcd_test_~b#1| .cse0)) 0) (not (= .cse16 .cse18))))) (<= .cse4 |c_ULTIMATE.start_gcd_test_~b#1|)) (or (<= .cse9 |c_ULTIMATE.start_gcd_test_~b#1|) (let ((.cse19 (* 4 |c_ULTIMATE.start_gcd_test_~b#1|))) (and (or (not (= .cse18 .cse19)) (= (mod |c_ULTIMATE.start_main1_~x~0#1| (+ .cse17 .cse1)) 0)) (or (not (= .cse15 .cse13)) (= (mod |c_ULTIMATE.start_main1_~x~0#1| (+ .cse12 .cse7)) 0)) (or (= (mod |c_ULTIMATE.start_main1_~x~0#1| (+ .cse14 .cse1)) 0) (not (= .cse18 .cse13))) (or (not (= .cse19 .cse3)) (= (mod |c_ULTIMATE.start_main1_~x~0#1| (+ |c_ULTIMATE.start_gcd_test_~b#1| .cse6)) 0))))) (or (<= .cse8 |c_ULTIMATE.start_gcd_test_~b#1|) (not (= .cse18 (* 2 |c_ULTIMATE.start_gcd_test_~b#1|))) (= (mod |c_ULTIMATE.start_main1_~x~0#1| (+ |c_ULTIMATE.start_gcd_test_~b#1| .cse12)) 0))))))) is different from true [2021-11-23 03:08:10,763 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 5 not checked. [2021-11-23 03:08:10,763 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:08:10,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [747481330] [2021-11-23 03:08:10,764 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:08:10,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [67381061] [2021-11-23 03:08:10,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [67381061] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:08:10,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1130754546] [2021-11-23 03:08:10,766 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-23 03:08:10,767 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:08:10,767 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:08:10,767 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:08:10,767 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:08:10,954 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2021-11-23 03:08:10,989 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:08:13,731 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1053#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:08:13,732 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:08:13,732 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:08:13,732 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 20 [2021-11-23 03:08:13,732 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184778223] [2021-11-23 03:08:13,732 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:08:13,733 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 03:08:13,733 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:08:13,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 03:08:13,734 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=599, Unknown=1, NotChecked=50, Total=756 [2021-11-23 03:08:13,734 INFO L87 Difference]: Start difference. First operand 39 states and 46 transitions. Second operand has 20 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 2 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:08:14,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:08:14,434 INFO L93 Difference]: Finished difference Result 53 states and 61 transitions. [2021-11-23 03:08:14,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 03:08:14,435 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 2 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-23 03:08:14,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:08:14,436 INFO L225 Difference]: With dead ends: 53 [2021-11-23 03:08:14,436 INFO L226 Difference]: Without dead ends: 36 [2021-11-23 03:08:14,437 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 53.5s TimeCoverageRelationStatistics Valid=133, Invalid=740, Unknown=1, NotChecked=56, Total=930 [2021-11-23 03:08:14,438 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 23 mSDsluCounter, 271 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 253 SdHoareTripleChecker+Invalid, 241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 38 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:08:14,438 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 253 Invalid, 241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 174 Invalid, 0 Unknown, 38 Unchecked, 0.5s Time] [2021-11-23 03:08:14,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-23 03:08:14,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-11-23 03:08:14,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 23 states have (on average 1.0434782608695652) internal successors, (24), 24 states have internal predecessors, (24), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-23 03:08:14,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2021-11-23 03:08:14,446 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 14 [2021-11-23 03:08:14,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:08:14,446 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2021-11-23 03:08:14,446 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 2 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:08:14,447 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2021-11-23 03:08:14,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 03:08:14,448 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:08:14,448 INFO L514 BasicCegarLoop]: trace histogram [5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:08:14,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 03:08:14,663 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-23 03:08:14,664 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:08:14,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:08:14,664 INFO L85 PathProgramCache]: Analyzing trace with hash 1742833996, now seen corresponding path program 1 times [2021-11-23 03:08:14,664 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:08:14,664 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [652026589] [2021-11-23 03:08:14,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:08:14,665 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:08:14,681 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:08:14,682 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [150900265] [2021-11-23 03:08:14,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:08:14,683 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:08:14,683 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:08:14,686 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:08:14,699 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 03:08:14,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:08:14,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 03:08:14,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:08:14,979 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:08:14,979 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:08:23,485 WARN L227 SmtUtils]: Spent 7.97s on a formula simplification that was a NOOP. DAG size: 26 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:08:41,901 WARN L227 SmtUtils]: Spent 10.80s on a formula simplification that was a NOOP. DAG size: 51 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:09:32,750 WARN L227 SmtUtils]: Spent 37.16s on a formula simplification that was a NOOP. DAG size: 89 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:11:55,558 WARN L227 SmtUtils]: Spent 1.72m on a formula simplification that was a NOOP. DAG size: 156 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:12:22,299 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 13 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:12:22,299 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:12:22,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [652026589] [2021-11-23 03:12:22,300 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:12:22,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [150900265] [2021-11-23 03:12:22,300 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [150900265] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:12:22,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1150220831] [2021-11-23 03:12:22,302 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-23 03:12:22,302 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:12:22,303 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:12:22,303 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:12:22,303 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:12:22,617 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 46 for LOIs [2021-11-23 03:12:22,792 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:12:32,807 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1333#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:12:32,807 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:12:32,807 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:12:32,807 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 20 [2021-11-23 03:12:32,808 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456603535] [2021-11-23 03:12:32,808 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:12:32,808 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 03:12:32,808 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:12:32,809 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 03:12:32,809 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=734, Unknown=5, NotChecked=0, Total=870 [2021-11-23 03:12:32,810 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand has 20 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:12:34,540 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 03:12:37,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:12:37,625 INFO L93 Difference]: Finished difference Result 36 states and 39 transitions. [2021-11-23 03:12:37,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 03:12:37,626 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 19 [2021-11-23 03:12:37,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:12:37,627 INFO L225 Difference]: With dead ends: 36 [2021-11-23 03:12:37,627 INFO L226 Difference]: Without dead ends: 18 [2021-11-23 03:12:37,628 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 183.4s TimeCoverageRelationStatistics Valid=161, Invalid=889, Unknown=6, NotChecked=0, Total=1056 [2021-11-23 03:12:37,629 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 10 mSDsluCounter, 337 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 306 SdHoareTripleChecker+Invalid, 177 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:12:37,629 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 306 Invalid, 177 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 164 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 03:12:37,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-23 03:12:37,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-11-23 03:12:37,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 9 states have (on average 1.0) internal successors, (9), 9 states have internal predecessors, (9), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 03:12:37,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2021-11-23 03:12:37,633 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 19 [2021-11-23 03:12:37,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:12:37,633 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2021-11-23 03:12:37,634 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:12:37,634 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2021-11-23 03:12:37,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-23 03:12:37,634 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:12:37,635 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:12:37,663 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 03:12:37,848 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-23 03:12:37,848 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:12:37,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:12:37,849 INFO L85 PathProgramCache]: Analyzing trace with hash -1049715433, now seen corresponding path program 1 times [2021-11-23 03:12:37,849 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:12:37,849 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [217916541] [2021-11-23 03:12:37,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:12:37,849 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:12:37,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-23 03:12:37,865 INFO L355 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-11-23 03:12:37,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-23 03:12:37,904 INFO L133 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2021-11-23 03:12:37,907 INFO L628 BasicCegarLoop]: Counterexample is feasible [2021-11-23 03:12:37,909 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (1 of 2 remaining) [2021-11-23 03:12:37,911 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 2 remaining) [2021-11-23 03:12:37,912 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 03:12:37,916 INFO L732 BasicCegarLoop]: Path program histogram: [4, 1, 1, 1, 1] [2021-11-23 03:12:37,919 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-23 03:12:37,955 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.11 03:12:37 BoogieIcfgContainer [2021-11-23 03:12:37,955 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-23 03:12:37,956 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-23 03:12:37,956 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-23 03:12:37,957 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-23 03:12:37,957 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:06:35" (3/4) ... [2021-11-23 03:12:37,960 INFO L140 WitnessPrinter]: No result that supports witness generation found [2021-11-23 03:12:37,961 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-23 03:12:37,961 INFO L158 Benchmark]: Toolchain (without parser) took 363421.01ms. Allocated memory was 88.1MB in the beginning and 130.0MB in the end (delta: 41.9MB). Free memory was 47.5MB in the beginning and 77.5MB in the end (delta: -29.9MB). Peak memory consumption was 11.2MB. Max. memory is 16.1GB. [2021-11-23 03:12:37,962 INFO L158 Benchmark]: CDTParser took 0.36ms. Allocated memory is still 88.1MB. Free memory was 63.6MB in the beginning and 63.5MB in the end (delta: 56.7kB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 03:12:37,962 INFO L158 Benchmark]: CACSL2BoogieTranslator took 326.38ms. Allocated memory is still 88.1MB. Free memory was 47.3MB in the beginning and 62.6MB in the end (delta: -15.2MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2021-11-23 03:12:37,963 INFO L158 Benchmark]: Boogie Procedure Inliner took 40.34ms. Allocated memory is still 88.1MB. Free memory was 62.4MB in the beginning and 60.7MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 03:12:37,963 INFO L158 Benchmark]: Boogie Preprocessor took 27.35ms. Allocated memory is still 88.1MB. Free memory was 60.7MB in the beginning and 59.6MB in the end (delta: 1.1MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 03:12:37,964 INFO L158 Benchmark]: RCFGBuilder took 461.94ms. Allocated memory is still 88.1MB. Free memory was 59.6MB in the beginning and 46.7MB in the end (delta: 12.9MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. [2021-11-23 03:12:37,964 INFO L158 Benchmark]: TraceAbstraction took 362553.50ms. Allocated memory was 88.1MB in the beginning and 130.0MB in the end (delta: 41.9MB). Free memory was 46.0MB in the beginning and 78.5MB in the end (delta: -32.5MB). Peak memory consumption was 11.1MB. Max. memory is 16.1GB. [2021-11-23 03:12:37,964 INFO L158 Benchmark]: Witness Printer took 4.44ms. Allocated memory is still 130.0MB. Free memory was 78.5MB in the beginning and 77.5MB in the end (delta: 1.0MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 03:12:37,966 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.36ms. Allocated memory is still 88.1MB. Free memory was 63.6MB in the beginning and 63.5MB in the end (delta: 56.7kB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 326.38ms. Allocated memory is still 88.1MB. Free memory was 47.3MB in the beginning and 62.6MB in the end (delta: -15.2MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 40.34ms. Allocated memory is still 88.1MB. Free memory was 62.4MB in the beginning and 60.7MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 27.35ms. Allocated memory is still 88.1MB. Free memory was 60.7MB in the beginning and 59.6MB in the end (delta: 1.1MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 461.94ms. Allocated memory is still 88.1MB. Free memory was 59.6MB in the beginning and 46.7MB in the end (delta: 12.9MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. * TraceAbstraction took 362553.50ms. Allocated memory was 88.1MB in the beginning and 130.0MB in the end (delta: 41.9MB). Free memory was 46.0MB in the beginning and 78.5MB in the end (delta: -32.5MB). Peak memory consumption was 11.1MB. Max. memory is 16.1GB. * Witness Printer took 4.44ms. Allocated memory is still 130.0MB. Free memory was 78.5MB in the beginning and 77.5MB in the end (delta: 1.0MB). There was no memory consumed. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - UnprovableResult [Line: 109]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: overapproximation of someBinaryFLOATComparisonOperation at line 98, overapproximation of someBinaryDOUBLEComparisonOperation at line 108, overapproximation of someBinaryArithmeticFLOAToperation at line 104. Possible FailurePath: [L115] COND FALSE !(__VERIFIER_nondet_int()) [L118] CALL main2() [L97] float IN = __VERIFIER_nondet_float(); [L98] CALL assume_abort_if_not(IN > -1.4f && IN < 1.4f) [L82] COND FALSE !(!cond) [L98] RET assume_abort_if_not(IN > -1.4f && IN < 1.4f) [L100] CALL, EXPR f(IN) VAL [\old(x)=50] [L87] return x - (x*x*x)/6.0f + (x*x*x*x*x)/120.0f + (x*x*x*x*x*x*x)/5040.0f; [L100] RET, EXPR f(IN) VAL [f(IN)=49, IN=50] [L100] CALL, EXPR fp(IN) VAL [\old(x)=50] [L92] return 1 - (x*x)/2.0f + (x*x*x*x)/24.0f + (x*x*x*x*x*x)/720.0f; [L100] RET, EXPR fp(IN) VAL [f(IN)=49, fp(IN)=52, IN=50] [L100] float x = IN - f(IN)/fp(IN); [L102] CALL, EXPR f(x) VAL [\old(x)=51] [L87] return x - (x*x*x)/6.0f + (x*x*x*x*x)/120.0f + (x*x*x*x*x*x*x)/5040.0f; [L102] RET, EXPR f(x) VAL [f(x)=57, IN=50, x=51] [L102] CALL, EXPR fp(x) VAL [\old(x)=51] [L92] return 1 - (x*x)/2.0f + (x*x*x*x)/24.0f + (x*x*x*x*x*x)/720.0f; [L102] RET, EXPR fp(x) VAL [f(x)=57, fp(x)=55, IN=50, x=51] [L102] x = x - f(x)/fp(x) [L104] CALL, EXPR f(x) VAL [\old(x)=54] [L87] return x - (x*x*x)/6.0f + (x*x*x*x*x)/120.0f + (x*x*x*x*x*x*x)/5040.0f; [L104] RET, EXPR f(x) VAL [f(x)=56, IN=50, x=54] [L104] CALL, EXPR fp(x) VAL [\old(x)=54] [L92] return 1 - (x*x)/2.0f + (x*x*x*x)/24.0f + (x*x*x*x*x*x)/720.0f; [L104] RET, EXPR fp(x) VAL [f(x)=56, fp(x)=53, IN=50, x=54] [L104] x = x - f(x)/fp(x) [L108] COND TRUE !(x < 0.1) VAL [IN=50] [L109] reach_error() VAL [IN=50] - UnprovableResult [Line: 27]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: Not analyzed. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 34 locations, 2 error locations. Started 1 CEGAR loops. OverallTime: 362.5s, OverallIterations: 8, TraceHistogramMax: 5, PathProgramHistogramMax: 4, EmptinessCheckTime: 0.0s, AutomataDifference: 6.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 64 SdHoareTripleChecker+Valid, 3.1s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 59 mSDsluCounter, 1094 SdHoareTripleChecker+Invalid, 3.0s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 38 IncrementalHoareTripleChecker+Unchecked, 1060 mSDsCounter, 79 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 500 IncrementalHoareTripleChecker+Invalid, 617 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 79 mSolverCounterUnsat, 193 mSDtfsCounter, 500 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 223 GetRequests, 105 SyntacticMatches, 3 SemanticMatches, 115 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 484 ImplicationChecksByTransitivity, 239.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=39occurred in iteration=5, InterpolantAutomatonStates: 55, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 7 MinimizatonAttempts, 5 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 337.6s InterpolantComputationTime, 110 NumberOfCodeBlocks, 110 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 141 ConstructedInterpolants, 0 QuantifiedInterpolants, 2896 SizeOfPredicates, 33 NumberOfNonLiveVariables, 436 ConjunctsInSsa, 101 ConjunctsInUnsatCore, 12 InterpolantComputations, 2 PerfectInterpolantSequences, 4/98 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces [2021-11-23 03:12:38,055 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/gcd_4+newton_3_7.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V --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 87bc0d62bd0ac2c8f0b3bcd924815b04302ef88419a4b535524b284cb471b329 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:12:40,551 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:12:40,555 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:12:40,619 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:12:40,620 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:12:40,625 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:12:40,627 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:12:40,633 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:12:40,637 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:12:40,647 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:12:40,649 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:12:40,651 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:12:40,652 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:12:40,655 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:12:40,657 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:12:40,667 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:12:40,669 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:12:40,670 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:12:40,673 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:12:40,682 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:12:40,685 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:12:40,686 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:12:40,689 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:12:40,692 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:12:40,702 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:12:40,702 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:12:40,703 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:12:40,706 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:12:40,706 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:12:40,708 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:12:40,708 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:12:40,710 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:12:40,712 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:12:40,713 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:12:40,715 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:12:40,715 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:12:40,716 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:12:40,717 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:12:40,717 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:12:40,719 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:12:40,720 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:12:40,721 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 03:12:40,767 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:12:40,767 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:12:40,767 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:12:40,768 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:12:40,769 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:12:40,769 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:12:40,769 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:12:40,770 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:12:40,770 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:12:40,770 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:12:40,770 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:12:40,771 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:12:40,772 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:12:40,772 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:12:40,772 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:12:40,772 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:12:40,773 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:12:40,773 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:12:40,773 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:12:40,773 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 03:12:40,774 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 03:12:40,774 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 03:12:40,774 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:12:40,774 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:12:40,775 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:12:40,775 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:12:40,775 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:12:40,775 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 03:12:40,776 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:12:40,776 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:12:40,776 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:12:40,776 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:12:40,777 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:12:40,777 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 03:12:40,777 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 03:12:40,778 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:12:40,778 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:12:40,778 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:12:40,778 INFO L138 SettingsManager]: * Logic for external solver=AUFBV WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 87bc0d62bd0ac2c8f0b3bcd924815b04302ef88419a4b535524b284cb471b329 [2021-11-23 03:12:41,224 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:12:41,249 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:12:41,252 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:12:41,254 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:12:41,255 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:12:41,257 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/combinations/gcd_4+newton_3_7.i [2021-11-23 03:12:41,330 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/data/de22309e5/6de01ce14e9f40a9b7f882ad565995e7/FLAGa11cfb886 [2021-11-23 03:12:41,844 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:12:41,845 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/sv-benchmarks/c/combinations/gcd_4+newton_3_7.i [2021-11-23 03:12:41,855 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/data/de22309e5/6de01ce14e9f40a9b7f882ad565995e7/FLAGa11cfb886 [2021-11-23 03:12:42,225 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/data/de22309e5/6de01ce14e9f40a9b7f882ad565995e7 [2021-11-23 03:12:42,228 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:12:42,230 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:12:42,236 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:12:42,237 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:12:42,242 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:12:42,243 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:12:42" (1/1) ... [2021-11-23 03:12:42,245 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@423f9e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:12:42, skipping insertion in model container [2021-11-23 03:12:42,245 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:12:42" (1/1) ... [2021-11-23 03:12:42,254 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:12:42,277 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:12:42,445 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_66565ecf-02b4-4615-82f9-52b14759b82e/sv-benchmarks/c/combinations/gcd_4+newton_3_7.i[1224,1237] [2021-11-23 03:12:42,479 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_66565ecf-02b4-4615-82f9-52b14759b82e/sv-benchmarks/c/combinations/gcd_4+newton_3_7.i[2848,2861] [2021-11-23 03:12:42,481 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:12:42,500 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:12:42,526 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_66565ecf-02b4-4615-82f9-52b14759b82e/sv-benchmarks/c/combinations/gcd_4+newton_3_7.i[1224,1237] [2021-11-23 03:12:42,556 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_66565ecf-02b4-4615-82f9-52b14759b82e/sv-benchmarks/c/combinations/gcd_4+newton_3_7.i[2848,2861] [2021-11-23 03:12:42,558 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:12:42,590 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:12:42,591 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:12:42 WrapperNode [2021-11-23 03:12:42,591 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:12:42,593 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:12:42,593 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:12:42,594 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:12:42,603 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:12:42" (1/1) ... [2021-11-23 03:12:42,631 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:12:42" (1/1) ... [2021-11-23 03:12:42,670 INFO L137 Inliner]: procedures = 28, calls = 20, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 74 [2021-11-23 03:12:42,671 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:12:42,673 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:12:42,674 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:12:42,674 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:12:42,684 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:12:42" (1/1) ... [2021-11-23 03:12:42,684 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:12:42" (1/1) ... [2021-11-23 03:12:42,699 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:12:42" (1/1) ... [2021-11-23 03:12:42,700 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:12:42" (1/1) ... [2021-11-23 03:12:42,721 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:12:42" (1/1) ... [2021-11-23 03:12:42,732 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:12:42" (1/1) ... [2021-11-23 03:12:42,736 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:12:42" (1/1) ... [2021-11-23 03:12:42,755 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:12:42,756 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:12:42,756 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:12:42,757 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:12:42,758 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:12:42" (1/1) ... [2021-11-23 03:12:42,770 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:12:42,788 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:12:42,806 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:12:42,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:12:42,865 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:12:42,865 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 03:12:42,865 INFO L130 BoogieDeclarations]: Found specification of procedure fp [2021-11-23 03:12:42,865 INFO L138 BoogieDeclarations]: Found implementation of procedure fp [2021-11-23 03:12:42,866 INFO L130 BoogieDeclarations]: Found specification of procedure f [2021-11-23 03:12:42,866 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2021-11-23 03:12:42,866 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:12:42,866 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:12:42,866 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-23 03:12:42,866 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-23 03:12:42,993 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:12:42,995 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:12:51,950 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:12:51,958 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:12:51,958 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 03:12:51,960 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:12:51 BoogieIcfgContainer [2021-11-23 03:12:51,961 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:12:51,963 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:12:51,963 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:12:51,967 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:12:51,968 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:12:42" (1/3) ... [2021-11-23 03:12:51,969 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b1df697 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:12:51, skipping insertion in model container [2021-11-23 03:12:51,969 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:12:42" (2/3) ... [2021-11-23 03:12:51,970 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b1df697 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:12:51, skipping insertion in model container [2021-11-23 03:12:51,970 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:12:51" (3/3) ... [2021-11-23 03:12:51,972 INFO L111 eAbstractionObserver]: Analyzing ICFG gcd_4+newton_3_7.i [2021-11-23 03:12:51,978 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:12:51,979 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 03:12:52,068 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:12:52,077 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 [2021-11-23 03:12:52,078 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 03:12:52,099 INFO L276 IsEmpty]: Start isEmpty. Operand has 46 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 33 states have internal predecessors, (43), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-23 03:12:52,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-23 03:12:52,106 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:12:52,107 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:12:52,108 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:12:52,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:12:52,115 INFO L85 PathProgramCache]: Analyzing trace with hash -1780387208, now seen corresponding path program 1 times [2021-11-23 03:12:52,130 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:12:52,131 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [286362972] [2021-11-23 03:12:52,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:12:52,132 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:12:52,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:12:52,137 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:12:52,144 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 03:12:52,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:12:52,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:12:52,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:12:52,450 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:12:52,450 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:12:52,614 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:12:52,615 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:12:52,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [286362972] [2021-11-23 03:12:52,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [286362972] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:12:52,617 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:12:52,618 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-23 03:12:52,620 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275550847] [2021-11-23 03:12:52,621 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:12:52,626 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:12:52,627 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:12:52,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:12:52,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:12:52,667 INFO L87 Difference]: Start difference. First operand has 46 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 33 states have internal predecessors, (43), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 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) [2021-11-23 03:12:52,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:12:52,806 INFO L93 Difference]: Finished difference Result 99 states and 137 transitions. [2021-11-23 03:12:52,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:12:52,809 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 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 11 [2021-11-23 03:12:52,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:12:52,819 INFO L225 Difference]: With dead ends: 99 [2021-11-23 03:12:52,820 INFO L226 Difference]: Without dead ends: 46 [2021-11-23 03:12:52,824 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:12:52,829 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 13 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:12:52,831 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 147 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:12:52,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-23 03:12:52,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 39. [2021-11-23 03:12:52,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 25 states have (on average 1.2) internal successors, (30), 27 states have internal predecessors, (30), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-23 03:12:52,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2021-11-23 03:12:52,886 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 11 [2021-11-23 03:12:52,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:12:52,887 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2021-11-23 03:12:52,888 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 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) [2021-11-23 03:12:52,888 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2021-11-23 03:12:52,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-23 03:12:52,890 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:12:52,891 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:12:52,907 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 03:12:53,091 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:12:53,093 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:12:53,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:12:53,095 INFO L85 PathProgramCache]: Analyzing trace with hash 413718792, now seen corresponding path program 1 times [2021-11-23 03:12:53,095 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:12:53,096 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [158802121] [2021-11-23 03:12:53,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:12:53,097 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:12:53,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:12:53,112 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:12:53,113 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 03:12:53,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:12:53,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:12:53,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:12:53,374 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:12:53,375 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:12:53,607 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:12:53,608 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:12:53,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [158802121] [2021-11-23 03:12:53,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [158802121] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:12:53,609 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:12:53,609 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-23 03:12:53,609 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212423785] [2021-11-23 03:12:53,610 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:12:53,611 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:12:53,612 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:12:53,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:12:53,613 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:12:53,614 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 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) [2021-11-23 03:12:53,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:12:53,871 INFO L93 Difference]: Finished difference Result 55 states and 68 transitions. [2021-11-23 03:12:53,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:12:53,878 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 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 [2021-11-23 03:12:53,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:12:53,880 INFO L225 Difference]: With dead ends: 55 [2021-11-23 03:12:53,880 INFO L226 Difference]: Without dead ends: 41 [2021-11-23 03:12:53,880 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:12:53,882 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 10 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:12:53,882 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 78 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:12:53,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-23 03:12:53,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-11-23 03:12:53,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 29 states have internal predecessors, (32), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-23 03:12:53,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2021-11-23 03:12:53,895 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 13 [2021-11-23 03:12:53,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:12:53,895 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2021-11-23 03:12:53,896 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 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) [2021-11-23 03:12:53,896 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2021-11-23 03:12:53,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-23 03:12:53,897 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:12:53,898 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:12:53,920 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:12:54,115 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:12:54,116 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:12:54,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:12:54,117 INFO L85 PathProgramCache]: Analyzing trace with hash -1714945339, now seen corresponding path program 1 times [2021-11-23 03:12:54,117 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:12:54,118 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [144213431] [2021-11-23 03:12:54,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:12:54,118 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:12:54,118 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:12:54,121 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:12:54,122 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 03:12:54,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:12:54,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 03:12:54,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:12:54,596 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:12:54,596 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:12:54,801 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:12:54,802 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:12:54,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [144213431] [2021-11-23 03:12:54,803 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [144213431] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:12:54,803 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:12:54,803 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-23 03:12:54,804 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331408415] [2021-11-23 03:12:54,804 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:12:54,805 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:12:54,805 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:12:54,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:12:54,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:12:54,807 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 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) [2021-11-23 03:12:54,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:12:54,938 INFO L93 Difference]: Finished difference Result 58 states and 71 transitions. [2021-11-23 03:12:54,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:12:54,940 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 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 15 [2021-11-23 03:12:54,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:12:54,942 INFO L225 Difference]: With dead ends: 58 [2021-11-23 03:12:54,942 INFO L226 Difference]: Without dead ends: 45 [2021-11-23 03:12:54,943 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:12:54,945 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 0 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:12:54,946 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 115 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:12:54,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-23 03:12:54,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-11-23 03:12:54,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 33 states have internal predecessors, (36), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-23 03:12:54,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2021-11-23 03:12:54,959 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 15 [2021-11-23 03:12:54,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:12:54,959 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2021-11-23 03:12:54,960 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 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) [2021-11-23 03:12:54,960 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2021-11-23 03:12:54,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 03:12:54,961 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:12:54,961 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:12:54,973 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (4)] Ended with exit code 0 [2021-11-23 03:12:55,162 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:12:55,163 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:12:55,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:12:55,164 INFO L85 PathProgramCache]: Analyzing trace with hash 1992824063, now seen corresponding path program 1 times [2021-11-23 03:12:55,164 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:12:55,165 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1121421795] [2021-11-23 03:12:55,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:12:55,165 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:12:55,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:12:55,176 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:12:55,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 03:12:55,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:12:55,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:12:55,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:12:55,930 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:12:55,930 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:12:56,503 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:12:56,504 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:12:56,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1121421795] [2021-11-23 03:12:56,504 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1121421795] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:12:56,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [660819690] [2021-11-23 03:12:56,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:12:56,505 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:12:56,505 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:12:56,513 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:12:56,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (6)] Waiting until timeout for monitored process [2021-11-23 03:12:56,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:12:56,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:12:56,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:12:57,183 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:12:57,183 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:12:57,492 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:12:57,493 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [660819690] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:12:57,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [921506903] [2021-11-23 03:12:57,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:12:57,493 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:12:57,494 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:12:57,501 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:12:57,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 03:12:57,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:12:57,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 03:12:57,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:12:58,182 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:12:58,182 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:12:59,545 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:12:59,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [921506903] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:12:59,545 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 03:12:59,545 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 6, 6] total 13 [2021-11-23 03:12:59,546 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525924554] [2021-11-23 03:12:59,546 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 03:12:59,546 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 03:12:59,547 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:12:59,547 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 03:12:59,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=111, Unknown=0, NotChecked=0, Total=156 [2021-11-23 03:12:59,548 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand has 13 states, 13 states have (on average 3.1538461538461537) internal successors, (41), 13 states have internal predecessors, (41), 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) [2021-11-23 03:13:00,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:13:00,402 INFO L93 Difference]: Finished difference Result 67 states and 83 transitions. [2021-11-23 03:13:00,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 03:13:00,403 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.1538461538461537) internal successors, (41), 13 states have internal predecessors, (41), 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 19 [2021-11-23 03:13:00,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:13:00,406 INFO L225 Difference]: With dead ends: 67 [2021-11-23 03:13:00,406 INFO L226 Difference]: Without dead ends: 54 [2021-11-23 03:13:00,407 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2021-11-23 03:13:00,408 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 19 mSDsluCounter, 298 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 338 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 24 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:13:00,409 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 338 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 61 Invalid, 0 Unknown, 24 Unchecked, 0.4s Time] [2021-11-23 03:13:00,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-23 03:13:00,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2021-11-23 03:13:00,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 40 states have internal predecessors, (45), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-23 03:13:00,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 62 transitions. [2021-11-23 03:13:00,430 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 62 transitions. Word has length 19 [2021-11-23 03:13:00,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:13:00,430 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 62 transitions. [2021-11-23 03:13:00,431 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 3.1538461538461537) internal successors, (41), 13 states have internal predecessors, (41), 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) [2021-11-23 03:13:00,431 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 62 transitions. [2021-11-23 03:13:00,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-23 03:13:00,432 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:13:00,432 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:13:00,438 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (6)] Forceful destruction successful, exit code 0 [2021-11-23 03:13:00,645 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 03:13:00,860 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-23 03:13:01,035 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:13:01,036 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:13:01,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:13:01,036 INFO L85 PathProgramCache]: Analyzing trace with hash -1120707465, now seen corresponding path program 2 times [2021-11-23 03:13:01,037 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:13:01,037 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1176045333] [2021-11-23 03:13:01,037 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 03:13:01,037 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:13:01,037 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:13:01,044 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:13:01,049 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 03:13:01,116 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 03:13:01,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:13:01,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 03:13:01,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:13:02,462 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:13:02,462 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:13:12,228 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:13:12,228 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:13:12,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1176045333] [2021-11-23 03:13:12,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1176045333] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:13:12,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1585597084] [2021-11-23 03:13:12,229 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 03:13:12,229 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:13:12,230 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:13:12,231 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:13:12,233 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-11-23 03:13:12,409 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 03:13:12,409 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:13:12,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 03:13:12,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:13:13,096 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:13:13,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:13:14,721 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:13:14,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1585597084] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:13:14,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1950853629] [2021-11-23 03:13:14,722 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 03:13:14,723 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:13:14,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:13:14,732 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:13:14,733 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 03:13:14,801 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 03:13:14,801 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:13:14,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 03:13:14,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:13:15,444 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:13:15,444 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:13:31,160 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:13:31,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1950853629] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:13:31,161 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 03:13:31,161 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10, 12] total 23 [2021-11-23 03:13:31,162 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90265841] [2021-11-23 03:13:31,162 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 03:13:31,163 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-23 03:13:31,163 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:13:31,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-23 03:13:31,164 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=432, Unknown=0, NotChecked=0, Total=506 [2021-11-23 03:13:31,165 INFO L87 Difference]: Start difference. First operand 52 states and 62 transitions. Second operand has 23 states, 21 states have (on average 2.238095238095238) internal successors, (47), 21 states have internal predecessors, (47), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:14:00,759 WARN L227 SmtUtils]: Spent 19.58s on a formula simplification that was a NOOP. DAG size: 29 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:14:04,672 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.07s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 03:14:18,133 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.62s for a HTC check with result INVALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 03:14:20,502 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 03:14:22,611 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 03:14:27,082 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 03:14:40,155 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 03:15:00,699 WARN L227 SmtUtils]: Spent 11.86s on a formula simplification that was a NOOP. DAG size: 21 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:15:05,089 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 03:15:21,689 WARN L227 SmtUtils]: Spent 8.97s on a formula simplification that was a NOOP. DAG size: 24 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:15:40,919 WARN L227 SmtUtils]: Spent 11.36s on a formula simplification that was a NOOP. DAG size: 27 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:15:45,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:15:45,819 INFO L93 Difference]: Finished difference Result 79 states and 99 transitions. [2021-11-23 03:15:45,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 03:15:45,850 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 2.238095238095238) internal successors, (47), 21 states have internal predecessors, (47), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-23 03:15:45,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:15:45,851 INFO L225 Difference]: With dead ends: 79 [2021-11-23 03:15:45,852 INFO L226 Difference]: Without dead ends: 76 [2021-11-23 03:15:45,853 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 130.8s TimeCoverageRelationStatistics Valid=234, Invalid=952, Unknown=4, NotChecked=0, Total=1190 [2021-11-23 03:15:45,854 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 51 mSDsluCounter, 528 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 53 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 23.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 566 SdHoareTripleChecker+Invalid, 336 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 24.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:15:45,855 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 566 Invalid, 336 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 277 Invalid, 6 Unknown, 0 Unchecked, 24.5s Time] [2021-11-23 03:15:45,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-11-23 03:15:45,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 74. [2021-11-23 03:15:45,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 56 states have (on average 1.25) internal successors, (70), 60 states have internal predecessors, (70), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-23 03:15:45,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 92 transitions. [2021-11-23 03:15:45,872 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 92 transitions. Word has length 23 [2021-11-23 03:15:45,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:15:45,873 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 92 transitions. [2021-11-23 03:15:45,873 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 2.238095238095238) internal successors, (47), 21 states have internal predecessors, (47), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:15:45,874 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 92 transitions. [2021-11-23 03:15:45,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-23 03:15:45,876 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:15:45,876 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:15:45,891 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 03:15:46,081 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (9)] Ended with exit code 0 [2021-11-23 03:15:46,304 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 03:15:46,480 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:15:46,480 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:15:46,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:15:46,481 INFO L85 PathProgramCache]: Analyzing trace with hash 862133940, now seen corresponding path program 3 times [2021-11-23 03:15:46,481 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:15:46,482 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1097323672] [2021-11-23 03:15:46,482 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:15:46,482 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:15:46,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:15:46,483 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:15:46,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 03:15:46,598 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-23 03:15:46,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:15:46,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 03:15:46,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:15:47,723 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:15:47,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:15:49,141 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:15:49,141 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:15:49,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1097323672] [2021-11-23 03:15:49,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1097323672] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:15:49,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1980409772] [2021-11-23 03:15:49,142 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:15:49,143 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:15:49,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:15:49,149 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:15:49,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2021-11-23 03:15:49,585 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-23 03:15:49,585 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:15:49,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 03:15:49,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:15:50,238 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:15:50,239 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:15:50,720 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:15:50,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1980409772] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:15:50,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1526185413] [2021-11-23 03:15:50,721 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:15:50,721 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:15:50,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:15:50,724 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:15:50,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 03:15:50,817 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-23 03:15:50,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:15:50,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 03:15:50,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:15:51,416 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:15:51,416 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:15:51,804 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:15:51,804 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1526185413] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:15:51,805 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 03:15:51,805 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 8, 9] total 16 [2021-11-23 03:15:51,805 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770372194] [2021-11-23 03:15:51,805 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 03:15:51,806 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 03:15:51,806 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:15:51,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 03:15:51,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=167, Unknown=0, NotChecked=0, Total=240 [2021-11-23 03:15:51,807 INFO L87 Difference]: Start difference. First operand 74 states and 92 transitions. Second operand has 16 states, 16 states have (on average 2.6875) internal successors, (43), 16 states have internal predecessors, (43), 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) [2021-11-23 03:15:54,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:15:54,723 INFO L93 Difference]: Finished difference Result 121 states and 157 transitions. [2021-11-23 03:15:54,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 03:15:54,732 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.6875) internal successors, (43), 16 states have internal predecessors, (43), 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 25 [2021-11-23 03:15:54,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:15:54,734 INFO L225 Difference]: With dead ends: 121 [2021-11-23 03:15:54,734 INFO L226 Difference]: Without dead ends: 85 [2021-11-23 03:15:54,735 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 128 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=162, Invalid=344, Unknown=0, NotChecked=0, Total=506 [2021-11-23 03:15:54,736 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 48 mSDsluCounter, 296 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 336 SdHoareTripleChecker+Invalid, 199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 17 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:15:54,737 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 336 Invalid, 199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 132 Invalid, 0 Unknown, 17 Unchecked, 1.1s Time] [2021-11-23 03:15:54,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-11-23 03:15:54,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 75. [2021-11-23 03:15:54,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 58 states have (on average 1.2586206896551724) internal successors, (73), 61 states have internal predecessors, (73), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-23 03:15:54,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 93 transitions. [2021-11-23 03:15:54,754 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 93 transitions. Word has length 25 [2021-11-23 03:15:54,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:15:54,755 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 93 transitions. [2021-11-23 03:15:54,755 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.6875) internal successors, (43), 16 states have internal predecessors, (43), 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) [2021-11-23 03:15:54,755 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 93 transitions. [2021-11-23 03:15:54,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-23 03:15:54,757 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:15:54,757 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:15:54,775 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 03:15:54,966 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (12)] Ended with exit code 0 [2021-11-23 03:15:55,188 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 03:15:55,364 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:15:55,364 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:15:55,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:15:55,365 INFO L85 PathProgramCache]: Analyzing trace with hash 1781630816, now seen corresponding path program 1 times [2021-11-23 03:15:55,365 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:15:55,365 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1331803257] [2021-11-23 03:15:55,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:55,366 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:15:55,366 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:15:55,376 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:15:55,377 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-23 03:15:55,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:55,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 03:15:55,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:15:56,843 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:15:56,843 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:16:07,229 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:16:07,229 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:16:07,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1331803257] [2021-11-23 03:16:07,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1331803257] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:16:07,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2052669976] [2021-11-23 03:16:07,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:16:07,230 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:16:07,230 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:16:07,231 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:16:07,232 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (15)] Waiting until timeout for monitored process [2021-11-23 03:16:07,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:16:07,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 03:16:07,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:16:10,283 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:16:10,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:16:12,457 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:16:12,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2052669976] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:16:12,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1122404444] [2021-11-23 03:16:12,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:16:12,458 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:16:12,458 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:16:12,459 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:16:12,463 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 03:16:12,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:16:12,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 03:16:12,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:16:14,116 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 1 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:16:14,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:17:05,070 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 1 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:17:05,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1122404444] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:17:05,071 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 03:17:05,071 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 11, 10, 13, 14] total 34 [2021-11-23 03:17:05,071 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174980516] [2021-11-23 03:17:05,071 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 03:17:05,072 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 03:17:05,072 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:17:05,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 03:17:05,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=980, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 03:17:05,074 INFO L87 Difference]: Start difference. First operand 75 states and 93 transitions. Second operand has 34 states, 30 states have (on average 2.5) internal successors, (75), 33 states have internal predecessors, (75), 4 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-23 03:17:37,870 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 03:18:03,448 WARN L227 SmtUtils]: Spent 6.89s on a formula simplification that was a NOOP. DAG size: 44 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:18:24,482 WARN L227 SmtUtils]: Spent 11.72s on a formula simplification that was a NOOP. DAG size: 51 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:18:57,579 WARN L227 SmtUtils]: Spent 22.25s on a formula simplification that was a NOOP. DAG size: 58 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:19:27,261 WARN L227 SmtUtils]: Spent 12.71s on a formula simplification that was a NOOP. DAG size: 54 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:19:30,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:19:30,878 INFO L93 Difference]: Finished difference Result 97 states and 123 transitions. [2021-11-23 03:19:30,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 03:19:30,934 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 30 states have (on average 2.5) internal successors, (75), 33 states have internal predecessors, (75), 4 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 4 states have call successors, (5) Word has length 28 [2021-11-23 03:19:30,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:19:30,935 INFO L225 Difference]: With dead ends: 97 [2021-11-23 03:19:30,935 INFO L226 Difference]: Without dead ends: 87 [2021-11-23 03:19:30,937 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 391 ImplicationChecksByTransitivity, 173.2s TimeCoverageRelationStatistics Valid=314, Invalid=1756, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 03:19:30,938 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 65 mSDsluCounter, 525 mSDsCounter, 0 mSdLazyCounter, 373 mSolverCounterSat, 47 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 23.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 558 SdHoareTripleChecker+Invalid, 421 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 373 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 25.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:19:30,938 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 558 Invalid, 421 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 373 Invalid, 1 Unknown, 0 Unchecked, 25.6s Time] [2021-11-23 03:19:30,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-11-23 03:19:30,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2021-11-23 03:19:30,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 69 states have (on average 1.289855072463768) internal successors, (89), 72 states have internal predecessors, (89), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-23 03:19:30,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 110 transitions. [2021-11-23 03:19:30,957 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 110 transitions. Word has length 28 [2021-11-23 03:19:30,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:19:30,957 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 110 transitions. [2021-11-23 03:19:30,958 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 30 states have (on average 2.5) internal successors, (75), 33 states have internal predecessors, (75), 4 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-23 03:19:30,958 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 110 transitions. [2021-11-23 03:19:30,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-23 03:19:30,960 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:19:30,960 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:19:30,983 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-23 03:19:31,203 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-23 03:19:31,381 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (15)] Ended with exit code 0 [2021-11-23 03:19:31,578 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 03:19:31,579 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:19:31,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:19:31,580 INFO L85 PathProgramCache]: Analyzing trace with hash -21288017, now seen corresponding path program 1 times [2021-11-23 03:19:31,580 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:19:31,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [988223765] [2021-11-23 03:19:31,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:19:31,580 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:19:31,581 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:19:31,581 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:19:31,582 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_66565ecf-02b4-4615-82f9-52b14759b82e/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process