./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.5.1.ufo.UNBOUNDED.pals.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_523c44b3-d418-42a3-8320-d942a52b5804/bin/utaipan-aC7eJsxGYH/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_523c44b3-d418-42a3-8320-d942a52b5804/bin/utaipan-aC7eJsxGYH/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_523c44b3-d418-42a3-8320-d942a52b5804/bin/utaipan-aC7eJsxGYH/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_523c44b3-d418-42a3-8320-d942a52b5804/bin/utaipan-aC7eJsxGYH/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.5.1.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_523c44b3-d418-42a3-8320-d942a52b5804/bin/utaipan-aC7eJsxGYH/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_523c44b3-d418-42a3-8320-d942a52b5804/bin/utaipan-aC7eJsxGYH --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 6382bf7d3923cc5e5d05cc0b7a660c702c8db87925ef073e0a0a8704a68a4a3b --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-03 04:26:37,879 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-03 04:26:37,881 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-03 04:26:37,915 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-03 04:26:37,915 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-03 04:26:37,917 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-03 04:26:37,919 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-03 04:26:37,921 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-03 04:26:37,924 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-03 04:26:37,925 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-03 04:26:37,926 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-03 04:26:37,928 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-03 04:26:37,928 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-03 04:26:37,930 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-03 04:26:37,931 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-03 04:26:37,933 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-03 04:26:37,934 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-03 04:26:37,935 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-03 04:26:37,938 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-03 04:26:37,940 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-03 04:26:37,946 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-03 04:26:37,949 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-03 04:26:37,950 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-03 04:26:37,952 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-03 04:26:37,959 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-03 04:26:37,962 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-03 04:26:37,962 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-03 04:26:37,967 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-03 04:26:37,971 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-03 04:26:37,973 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-03 04:26:37,974 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-03 04:26:37,975 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-03 04:26:37,976 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-03 04:26:37,978 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-03 04:26:37,980 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-03 04:26:37,981 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-03 04:26:37,981 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-03 04:26:37,982 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-03 04:26:37,982 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-03 04:26:37,983 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-03 04:26:37,984 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-03 04:26:37,985 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_523c44b3-d418-42a3-8320-d942a52b5804/bin/utaipan-aC7eJsxGYH/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-03 04:26:38,040 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-03 04:26:38,041 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-03 04:26:38,043 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-03 04:26:38,043 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-03 04:26:38,043 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-03 04:26:38,043 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-03 04:26:38,044 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-03 04:26:38,044 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-03 04:26:38,051 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-03 04:26:38,051 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-03 04:26:38,052 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-03 04:26:38,052 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-03 04:26:38,053 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-03 04:26:38,053 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-03 04:26:38,053 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-03 04:26:38,054 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-03 04:26:38,054 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-03 04:26:38,054 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-03 04:26:38,055 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-03 04:26:38,055 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-03 04:26:38,055 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-03 04:26:38,055 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-03 04:26:38,056 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-03 04:26:38,056 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-03 04:26:38,056 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-03 04:26:38,056 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-03 04:26:38,057 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-03 04:26:38,057 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-03 04:26:38,057 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-03 04:26:38,059 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-03 04:26:38,059 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 04:26:38,060 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-03 04:26:38,060 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-03 04:26:38,060 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-03 04:26:38,060 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-03 04:26:38,061 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-03 04:26:38,061 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-03 04:26:38,061 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-03 04:26:38,061 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-03 04:26:38,062 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_523c44b3-d418-42a3-8320-d942a52b5804/bin/utaipan-aC7eJsxGYH/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_523c44b3-d418-42a3-8320-d942a52b5804/bin/utaipan-aC7eJsxGYH Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6382bf7d3923cc5e5d05cc0b7a660c702c8db87925ef073e0a0a8704a68a4a3b [2021-11-03 04:26:38,325 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-03 04:26:38,352 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-03 04:26:38,356 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-03 04:26:38,358 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-03 04:26:38,359 INFO L275 PluginConnector]: CDTParser initialized [2021-11-03 04:26:38,360 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_523c44b3-d418-42a3-8320-d942a52b5804/bin/utaipan-aC7eJsxGYH/../../sv-benchmarks/c/seq-mthreaded/pals_lcr.5.1.ufo.UNBOUNDED.pals.c [2021-11-03 04:26:38,447 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_523c44b3-d418-42a3-8320-d942a52b5804/bin/utaipan-aC7eJsxGYH/data/938ddeaa5/42479f3351c14e388a191f6378138477/FLAGee310e9f2 [2021-11-03 04:26:39,204 INFO L306 CDTParser]: Found 1 translation units. [2021-11-03 04:26:39,205 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_523c44b3-d418-42a3-8320-d942a52b5804/sv-benchmarks/c/seq-mthreaded/pals_lcr.5.1.ufo.UNBOUNDED.pals.c [2021-11-03 04:26:39,225 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_523c44b3-d418-42a3-8320-d942a52b5804/bin/utaipan-aC7eJsxGYH/data/938ddeaa5/42479f3351c14e388a191f6378138477/FLAGee310e9f2 [2021-11-03 04:26:39,472 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_523c44b3-d418-42a3-8320-d942a52b5804/bin/utaipan-aC7eJsxGYH/data/938ddeaa5/42479f3351c14e388a191f6378138477 [2021-11-03 04:26:39,474 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-03 04:26:39,476 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-03 04:26:39,477 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-03 04:26:39,477 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-03 04:26:39,481 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-03 04:26:39,482 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 04:26:39" (1/1) ... [2021-11-03 04:26:39,483 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7139a988 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:26:39, skipping insertion in model container [2021-11-03 04:26:39,483 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 04:26:39" (1/1) ... [2021-11-03 04:26:39,491 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-03 04:26:39,532 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-03 04:26:39,788 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_523c44b3-d418-42a3-8320-d942a52b5804/sv-benchmarks/c/seq-mthreaded/pals_lcr.5.1.ufo.UNBOUNDED.pals.c[11298,11311] [2021-11-03 04:26:39,791 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 04:26:39,803 INFO L203 MainTranslator]: Completed pre-run [2021-11-03 04:26:39,864 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_523c44b3-d418-42a3-8320-d942a52b5804/sv-benchmarks/c/seq-mthreaded/pals_lcr.5.1.ufo.UNBOUNDED.pals.c[11298,11311] [2021-11-03 04:26:39,864 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 04:26:39,882 INFO L208 MainTranslator]: Completed translation [2021-11-03 04:26:39,882 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:26:39 WrapperNode [2021-11-03 04:26:39,883 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-03 04:26:39,884 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-03 04:26:39,884 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-03 04:26:39,884 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-03 04:26:39,892 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:26:39" (1/1) ... [2021-11-03 04:26:39,903 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:26:39" (1/1) ... [2021-11-03 04:26:39,936 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-03 04:26:39,936 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-03 04:26:39,937 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-03 04:26:39,937 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-03 04:26:39,946 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:26:39" (1/1) ... [2021-11-03 04:26:39,946 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:26:39" (1/1) ... [2021-11-03 04:26:39,950 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:26:39" (1/1) ... [2021-11-03 04:26:39,951 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:26:39" (1/1) ... [2021-11-03 04:26:39,959 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:26:39" (1/1) ... [2021-11-03 04:26:39,966 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:26:39" (1/1) ... [2021-11-03 04:26:39,969 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:26:39" (1/1) ... [2021-11-03 04:26:39,974 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-03 04:26:39,975 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-03 04:26:39,991 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-03 04:26:39,991 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-03 04:26:39,992 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:26:39" (1/1) ... [2021-11-03 04:26:39,999 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 04:26:40,011 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_523c44b3-d418-42a3-8320-d942a52b5804/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:26:40,046 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_523c44b3-d418-42a3-8320-d942a52b5804/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-03 04:26:40,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_523c44b3-d418-42a3-8320-d942a52b5804/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-03 04:26:40,088 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-03 04:26:40,088 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-03 04:26:40,090 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-03 04:26:40,091 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-03 04:26:42,467 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-03 04:26:42,468 INFO L299 CfgBuilder]: Removed 23 assume(true) statements. [2021-11-03 04:26:42,471 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 04:26:42 BoogieIcfgContainer [2021-11-03 04:26:42,471 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-03 04:26:42,473 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-03 04:26:42,474 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-03 04:26:42,478 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-03 04:26:42,478 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 04:26:39" (1/3) ... [2021-11-03 04:26:42,479 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e9e6ef7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 04:26:42, skipping insertion in model container [2021-11-03 04:26:42,480 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:26:39" (2/3) ... [2021-11-03 04:26:42,480 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e9e6ef7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 04:26:42, skipping insertion in model container [2021-11-03 04:26:42,480 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 04:26:42" (3/3) ... [2021-11-03 04:26:42,485 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.5.1.ufo.UNBOUNDED.pals.c [2021-11-03 04:26:42,492 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-03 04:26:42,492 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-03 04:26:42,543 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-03 04:26:42,551 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 [2021-11-03 04:26:42,551 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-03 04:26:42,564 INFO L276 IsEmpty]: Start isEmpty. Operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:26:42,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-03 04:26:42,570 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:26:42,571 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-03 04:26:42,571 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:26:42,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:26:42,578 INFO L85 PathProgramCache]: Analyzing trace with hash 553204142, now seen corresponding path program 1 times [2021-11-03 04:26:42,588 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:26:42,589 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [776223983] [2021-11-03 04:26:42,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:26:42,590 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:26:42,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:26:43,207 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:26:43,208 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:26:43,208 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [776223983] [2021-11-03 04:26:43,210 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [776223983] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:26:43,210 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:26:43,210 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:26:43,213 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139689476] [2021-11-03 04:26:43,218 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:26:43,219 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:26:43,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:26:43,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:26:43,242 INFO L87 Difference]: Start difference. First operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:26:43,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:26:43,335 INFO L93 Difference]: Finished difference Result 30 states and 45 transitions. [2021-11-03 04:26:43,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:26:43,337 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-03 04:26:43,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:26:43,347 INFO L225 Difference]: With dead ends: 30 [2021-11-03 04:26:43,347 INFO L226 Difference]: Without dead ends: 20 [2021-11-03 04:26:43,351 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:26:43,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-03 04:26:43,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 12. [2021-11-03 04:26:43,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 11 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:26:43,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 15 transitions. [2021-11-03 04:26:43,387 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 15 transitions. Word has length 6 [2021-11-03 04:26:43,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:26:43,388 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 15 transitions. [2021-11-03 04:26:43,388 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:26:43,388 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 15 transitions. [2021-11-03 04:26:43,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-03 04:26:43,389 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:26:43,389 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:26:43,390 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-03 04:26:43,390 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:26:43,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:26:43,395 INFO L85 PathProgramCache]: Analyzing trace with hash -1703100276, now seen corresponding path program 1 times [2021-11-03 04:26:43,395 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:26:43,396 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [551348330] [2021-11-03 04:26:43,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:26:43,396 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:26:43,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:26:43,608 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:26:43,608 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:26:43,608 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [551348330] [2021-11-03 04:26:43,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [551348330] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:26:43,609 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:26:43,609 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:26:43,610 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416117425] [2021-11-03 04:26:43,611 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:26:43,611 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:26:43,612 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:26:43,612 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:26:43,613 INFO L87 Difference]: Start difference. First operand 12 states and 15 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:26:43,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:26:43,662 INFO L93 Difference]: Finished difference Result 29 states and 37 transitions. [2021-11-03 04:26:43,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:26:43,664 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-03 04:26:43,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:26:43,665 INFO L225 Difference]: With dead ends: 29 [2021-11-03 04:26:43,665 INFO L226 Difference]: Without dead ends: 20 [2021-11-03 04:26:43,666 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:26:43,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-03 04:26:43,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 13. [2021-11-03 04:26:43,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:26:43,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2021-11-03 04:26:43,674 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 8 [2021-11-03 04:26:43,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:26:43,676 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2021-11-03 04:26:43,677 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:26:43,677 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2021-11-03 04:26:43,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-03 04:26:43,678 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:26:43,678 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:26:43,678 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-03 04:26:43,679 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:26:43,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:26:43,681 INFO L85 PathProgramCache]: Analyzing trace with hash -1703398186, now seen corresponding path program 1 times [2021-11-03 04:26:43,682 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:26:43,685 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2008797533] [2021-11-03 04:26:43,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:26:43,686 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:26:43,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:26:44,025 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:26:44,025 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:26:44,025 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2008797533] [2021-11-03 04:26:44,026 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2008797533] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:26:44,026 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:26:44,026 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:26:44,026 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410306005] [2021-11-03 04:26:44,027 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:26:44,027 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:26:44,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:26:44,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:26:44,028 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:26:44,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:26:44,090 INFO L93 Difference]: Finished difference Result 29 states and 36 transitions. [2021-11-03 04:26:44,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:26:44,091 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-03 04:26:44,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:26:44,092 INFO L225 Difference]: With dead ends: 29 [2021-11-03 04:26:44,092 INFO L226 Difference]: Without dead ends: 20 [2021-11-03 04:26:44,093 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:26:44,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-03 04:26:44,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 14. [2021-11-03 04:26:44,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:26:44,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2021-11-03 04:26:44,097 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 8 [2021-11-03 04:26:44,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:26:44,097 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2021-11-03 04:26:44,097 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:26:44,097 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2021-11-03 04:26:44,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-03 04:26:44,098 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:26:44,098 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:26:44,098 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-03 04:26:44,099 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:26:44,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:26:44,100 INFO L85 PathProgramCache]: Analyzing trace with hash -1277308222, now seen corresponding path program 1 times [2021-11-03 04:26:44,101 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:26:44,101 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [656852949] [2021-11-03 04:26:44,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:26:44,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:26:44,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:26:44,248 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:26:44,249 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:26:44,249 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [656852949] [2021-11-03 04:26:44,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [656852949] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:26:44,254 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:26:44,255 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-03 04:26:44,255 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097294844] [2021-11-03 04:26:44,255 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 04:26:44,256 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:26:44,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 04:26:44,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:26:44,257 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:26:44,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:26:44,398 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2021-11-03 04:26:44,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-03 04:26:44,399 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-03 04:26:44,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:26:44,400 INFO L225 Difference]: With dead ends: 33 [2021-11-03 04:26:44,400 INFO L226 Difference]: Without dead ends: 31 [2021-11-03 04:26:44,401 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-03 04:26:44,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-03 04:26:44,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 17. [2021-11-03 04:26:44,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.25) internal successors, (20), 16 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:26:44,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2021-11-03 04:26:44,406 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 9 [2021-11-03 04:26:44,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:26:44,407 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2021-11-03 04:26:44,407 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:26:44,407 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2021-11-03 04:26:44,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-03 04:26:44,408 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:26:44,409 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:26:44,409 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-03 04:26:44,409 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:26:44,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:26:44,410 INFO L85 PathProgramCache]: Analyzing trace with hash 648576773, now seen corresponding path program 1 times [2021-11-03 04:26:44,410 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:26:44,411 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [365436984] [2021-11-03 04:26:44,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:26:44,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:26:44,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:26:45,816 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:26:45,817 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:26:45,817 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [365436984] [2021-11-03 04:26:45,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [365436984] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:26:45,817 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1629085827] [2021-11-03 04:26:45,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:26:45,818 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:26:45,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_523c44b3-d418-42a3-8320-d942a52b5804/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:26:45,820 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_523c44b3-d418-42a3-8320-d942a52b5804/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:26:45,846 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_523c44b3-d418-42a3-8320-d942a52b5804/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-03 04:26:46,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:26:46,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-03 04:26:46,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:26:53,285 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:26:53,285 INFO L328 TraceCheckSpWp]: Computing backward predicates...