./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.08.cil-1.c --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_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/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_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.08.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/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_cd05629f-7066-4957-8036-c99909f73859/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 bfa23a07aa8a02ca6771de75de8be171cc21a8c2878b440538c1944a91ea1c1d --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:38:00,634 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:38:00,637 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:38:00,698 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:38:00,699 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:38:00,705 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:38:00,709 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:38:00,714 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:38:00,717 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:38:00,726 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:38:00,727 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:38:00,729 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:38:00,730 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:38:00,733 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:38:00,735 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:38:00,739 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:38:00,741 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:38:00,742 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:38:00,748 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:38:00,754 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:38:00,759 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:38:00,761 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:38:00,765 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:38:00,766 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:38:00,774 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:38:00,775 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:38:00,775 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:38:00,778 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:38:00,779 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:38:00,780 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:38:00,782 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:38:00,783 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:38:00,785 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:38:00,787 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:38:00,789 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:38:00,789 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:38:00,790 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:38:00,790 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:38:00,790 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:38:00,792 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:38:00,793 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:38:00,794 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:38:00,845 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:38:00,846 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:38:00,846 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:38:00,847 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:38:00,848 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:38:00,848 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:38:00,848 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:38:00,849 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:38:00,849 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:38:00,849 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:38:00,850 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:38:00,851 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:38:00,851 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:38:00,851 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:38:00,852 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:38:00,852 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:38:00,852 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:38:00,852 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:38:00,853 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:38:00,854 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:38:00,854 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:38:00,854 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:38:00,854 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:38:00,855 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:38:00,855 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:38:00,855 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:38:00,857 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:38:00,857 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:38:00,857 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:38:00,858 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:38:00,858 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:38:00,858 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:38:00,859 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:38:00,859 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:38:00,859 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:38:00,860 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:38:00,860 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:38:00,860 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:38:00,860 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:38:00,861 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:38:00,861 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:38:00,861 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_cd05629f-7066-4957-8036-c99909f73859/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> bfa23a07aa8a02ca6771de75de8be171cc21a8c2878b440538c1944a91ea1c1d [2021-11-23 03:38:01,197 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:38:01,234 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:38:01,237 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:38:01,238 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:38:01,239 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:38:01,241 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.08.cil-1.c [2021-11-23 03:38:01,347 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/data/66df66685/2eed104d649d4205a815fec9b6aebfce/FLAG644df642e [2021-11-23 03:38:02,361 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:38:02,361 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/sv-benchmarks/c/combinations/Problem05_label45+token_ring.08.cil-1.c [2021-11-23 03:38:02,416 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/data/66df66685/2eed104d649d4205a815fec9b6aebfce/FLAG644df642e [2021-11-23 03:38:02,698 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/data/66df66685/2eed104d649d4205a815fec9b6aebfce [2021-11-23 03:38:02,702 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:38:02,705 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:38:02,707 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:38:02,708 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:38:02,711 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:38:02,713 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:38:02" (1/1) ... [2021-11-23 03:38:02,715 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@427bdc60 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:38:02, skipping insertion in model container [2021-11-23 03:38:02,715 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:38:02" (1/1) ... [2021-11-23 03:38:02,724 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:38:02,988 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:38:05,674 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_cd05629f-7066-4957-8036-c99909f73859/sv-benchmarks/c/combinations/Problem05_label45+token_ring.08.cil-1.c[380323,380336] [2021-11-23 03:38:05,706 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_cd05629f-7066-4957-8036-c99909f73859/sv-benchmarks/c/combinations/Problem05_label45+token_ring.08.cil-1.c[383339,383352] [2021-11-23 03:38:05,985 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:38:05,996 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:38:07,260 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_cd05629f-7066-4957-8036-c99909f73859/sv-benchmarks/c/combinations/Problem05_label45+token_ring.08.cil-1.c[380323,380336] [2021-11-23 03:38:07,265 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_cd05629f-7066-4957-8036-c99909f73859/sv-benchmarks/c/combinations/Problem05_label45+token_ring.08.cil-1.c[383339,383352] [2021-11-23 03:38:07,298 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:38:07,377 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:38:07,377 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:38:07 WrapperNode [2021-11-23 03:38:07,378 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:38:07,379 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:38:07,379 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:38:07,379 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:38:07,386 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:38:07" (1/1) ... [2021-11-23 03:38:07,516 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:38:07" (1/1) ... [2021-11-23 03:38:07,935 INFO L137 Inliner]: procedures = 60, calls = 65, calls flagged for inlining = 38, calls inlined = 38, statements flattened = 12967 [2021-11-23 03:38:07,936 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:38:07,936 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:38:07,936 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:38:07,937 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:38:07,945 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:38:07" (1/1) ... [2021-11-23 03:38:07,945 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:38:07" (1/1) ... [2021-11-23 03:38:08,070 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:38:07" (1/1) ... [2021-11-23 03:38:08,071 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:38:07" (1/1) ... [2021-11-23 03:38:08,239 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:38:07" (1/1) ... [2021-11-23 03:38:08,361 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:38:07" (1/1) ... [2021-11-23 03:38:08,381 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:38:07" (1/1) ... [2021-11-23 03:38:08,430 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:38:08,431 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:38:08,432 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:38:08,432 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:38:08,433 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:38:07" (1/1) ... [2021-11-23 03:38:08,440 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:38:08,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:38:08,468 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:38:08,498 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:38:08,518 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:38:08,518 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-23 03:38:08,519 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-23 03:38:08,519 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-23 03:38:08,519 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-23 03:38:08,519 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-23 03:38:08,519 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-23 03:38:08,520 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-23 03:38:08,520 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-23 03:38:08,520 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-23 03:38:08,520 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-23 03:38:08,520 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-23 03:38:08,521 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-23 03:38:08,521 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:38:08,521 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:38:08,521 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:38:08,687 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:38:08,689 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:38:16,197 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:38:18,818 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:38:18,819 INFO L301 CfgBuilder]: Removed 12 assume(true) statements. [2021-11-23 03:38:18,825 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:38:18 BoogieIcfgContainer [2021-11-23 03:38:18,825 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:38:18,827 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:38:18,827 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:38:18,831 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:38:18,831 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:38:02" (1/3) ... [2021-11-23 03:38:18,832 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6dd144b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:38:18, skipping insertion in model container [2021-11-23 03:38:18,832 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:38:07" (2/3) ... [2021-11-23 03:38:18,833 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6dd144b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:38:18, skipping insertion in model container [2021-11-23 03:38:18,833 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:38:18" (3/3) ... [2021-11-23 03:38:18,835 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label45+token_ring.08.cil-1.c [2021-11-23 03:38:18,840 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:38:18,841 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 03:38:18,904 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:38:18,911 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 03:38:18,911 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 03:38:18,975 INFO L276 IsEmpty]: Start isEmpty. Operand has 1787 states, 1756 states have (on average 1.964123006833713) internal successors, (3449), 1759 states have internal predecessors, (3449), 22 states have call successors, (22), 6 states have call predecessors, (22), 6 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-11-23 03:38:18,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-23 03:38:18,985 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:38:18,986 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:38:18,986 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:38:18,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:38:18,992 INFO L85 PathProgramCache]: Analyzing trace with hash 1468333002, now seen corresponding path program 1 times [2021-11-23 03:38:19,001 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:38:19,002 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [808526211] [2021-11-23 03:38:19,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:19,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:38:19,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:19,340 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 03:38:19,341 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:38:19,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [808526211] [2021-11-23 03:38:19,342 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [808526211] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:38:19,342 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:38:19,342 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:38:19,344 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726161350] [2021-11-23 03:38:19,345 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:38:19,349 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:38:19,349 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:38:19,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:38:19,404 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:38:19,411 INFO L87 Difference]: Start difference. First operand has 1787 states, 1756 states have (on average 1.964123006833713) internal successors, (3449), 1759 states have internal predecessors, (3449), 22 states have call successors, (22), 6 states have call predecessors, (22), 6 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) Second operand has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 03:38:20,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:38:20,359 INFO L93 Difference]: Finished difference Result 3701 states and 7203 transitions. [2021-11-23 03:38:20,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:38:20,361 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 55 [2021-11-23 03:38:20,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:38:20,398 INFO L225 Difference]: With dead ends: 3701 [2021-11-23 03:38:20,399 INFO L226 Difference]: Without dead ends: 1913 [2021-11-23 03:38:20,411 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:38:20,419 INFO L933 BasicCegarLoop]: 3391 mSDtfsCounter, 3647 mSDsluCounter, 3593 mSDsCounter, 0 mSdLazyCounter, 662 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3647 SdHoareTripleChecker+Valid, 6700 SdHoareTripleChecker+Invalid, 676 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 662 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 03:38:20,421 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3647 Valid, 6700 Invalid, 676 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 662 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 03:38:20,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1913 states. [2021-11-23 03:38:20,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1913 to 1912. [2021-11-23 03:38:20,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1912 states, 1858 states have (on average 1.9332615715823467) internal successors, (3592), 1861 states have internal predecessors, (3592), 40 states have call successors, (40), 12 states have call predecessors, (40), 12 states have return successors, (40), 39 states have call predecessors, (40), 40 states have call successors, (40) [2021-11-23 03:38:20,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1912 states to 1912 states and 3672 transitions. [2021-11-23 03:38:20,621 INFO L78 Accepts]: Start accepts. Automaton has 1912 states and 3672 transitions. Word has length 55 [2021-11-23 03:38:20,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:38:20,621 INFO L470 AbstractCegarLoop]: Abstraction has 1912 states and 3672 transitions. [2021-11-23 03:38:20,622 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 03:38:20,622 INFO L276 IsEmpty]: Start isEmpty. Operand 1912 states and 3672 transitions. [2021-11-23 03:38:20,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-23 03:38:20,631 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:38:20,631 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:38:20,631 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 03:38:20,632 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:38:20,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:38:20,636 INFO L85 PathProgramCache]: Analyzing trace with hash 2048661041, now seen corresponding path program 1 times [2021-11-23 03:38:20,636 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:38:20,637 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2091225119] [2021-11-23 03:38:20,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:20,637 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:38:20,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:20,826 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:38:20,827 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:38:20,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2091225119] [2021-11-23 03:38:20,827 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2091225119] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:38:20,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [506201021] [2021-11-23 03:38:20,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:20,829 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:38:20,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:38:20,831 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:38:20,857 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:38:21,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:21,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 768 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:38:21,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:38:21,311 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 03:38:21,311 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:38:21,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [506201021] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:38:21,312 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:38:21,312 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:38:21,313 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818031658] [2021-11-23 03:38:21,313 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:38:21,314 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:38:21,314 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:38:21,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:38:21,316 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:38:21,316 INFO L87 Difference]: Start difference. First operand 1912 states and 3672 transitions. Second operand has 3 states, 3 states have (on average 25.0) internal successors, (75), 2 states have internal predecessors, (75), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:38:21,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:38:21,902 INFO L93 Difference]: Finished difference Result 2437 states and 4475 transitions. [2021-11-23 03:38:21,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:38:21,903 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 2 states have internal predecessors, (75), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 108 [2021-11-23 03:38:21,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:38:21,923 INFO L225 Difference]: With dead ends: 2437 [2021-11-23 03:38:21,924 INFO L226 Difference]: Without dead ends: 2171 [2021-11-23 03:38:21,926 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:38:21,928 INFO L933 BasicCegarLoop]: 3275 mSDtfsCounter, 3447 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3447 SdHoareTripleChecker+Valid, 3440 SdHoareTripleChecker+Invalid, 294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:38:21,929 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3447 Valid, 3440 Invalid, 294 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 292 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 03:38:21,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2171 states. [2021-11-23 03:38:22,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2171 to 2167. [2021-11-23 03:38:22,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2167 states, 2067 states have (on average 1.8872762457668117) internal successors, (3901), 2071 states have internal predecessors, (3901), 74 states have call successors, (74), 24 states have call predecessors, (74), 24 states have return successors, (74), 72 states have call predecessors, (74), 74 states have call successors, (74) [2021-11-23 03:38:22,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2167 states to 2167 states and 4049 transitions. [2021-11-23 03:38:22,041 INFO L78 Accepts]: Start accepts. Automaton has 2167 states and 4049 transitions. Word has length 108 [2021-11-23 03:38:22,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:38:22,042 INFO L470 AbstractCegarLoop]: Abstraction has 2167 states and 4049 transitions. [2021-11-23 03:38:22,042 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 2 states have internal predecessors, (75), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:38:22,042 INFO L276 IsEmpty]: Start isEmpty. Operand 2167 states and 4049 transitions. [2021-11-23 03:38:22,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-23 03:38:22,048 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:38:22,049 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:38:22,088 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 03:38:22,271 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:38:22,272 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:38:22,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:38:22,273 INFO L85 PathProgramCache]: Analyzing trace with hash 1189092305, now seen corresponding path program 1 times [2021-11-23 03:38:22,273 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:38:22,273 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [887689651] [2021-11-23 03:38:22,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:22,274 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:38:22,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:22,438 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:38:22,438 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:38:22,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [887689651] [2021-11-23 03:38:22,439 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [887689651] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:38:22,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1526500963] [2021-11-23 03:38:22,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:22,440 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:38:22,440 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:38:22,446 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:38:22,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:38:22,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:22,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 762 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:38:22,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:38:22,818 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 03:38:22,819 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:38:22,819 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1526500963] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:38:22,819 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:38:22,820 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:38:22,820 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529282118] [2021-11-23 03:38:22,820 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:38:22,821 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:38:22,821 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:38:22,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:38:22,822 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:38:22,822 INFO L87 Difference]: Start difference. First operand 2167 states and 4049 transitions. Second operand has 3 states, 3 states have (on average 22.0) internal successors, (66), 2 states have internal predecessors, (66), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:38:23,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:38:23,303 INFO L93 Difference]: Finished difference Result 3196 states and 5616 transitions. [2021-11-23 03:38:23,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:38:23,304 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 2 states have internal predecessors, (66), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 108 [2021-11-23 03:38:23,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:38:23,328 INFO L225 Difference]: With dead ends: 3196 [2021-11-23 03:38:23,328 INFO L226 Difference]: Without dead ends: 2675 [2021-11-23 03:38:23,331 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:38:23,335 INFO L933 BasicCegarLoop]: 3263 mSDtfsCounter, 3456 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3456 SdHoareTripleChecker+Valid, 3428 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:38:23,336 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3456 Valid, 3428 Invalid, 291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 289 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:38:23,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2675 states. [2021-11-23 03:38:23,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2675 to 2669. [2021-11-23 03:38:23,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2669 states, 2479 states have (on average 1.81807180314643) internal successors, (4507), 2485 states have internal predecessors, (4507), 140 states have call successors, (140), 48 states have call predecessors, (140), 48 states have return successors, (140), 136 states have call predecessors, (140), 140 states have call successors, (140) [2021-11-23 03:38:23,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2669 states to 2669 states and 4787 transitions. [2021-11-23 03:38:23,474 INFO L78 Accepts]: Start accepts. Automaton has 2669 states and 4787 transitions. Word has length 108 [2021-11-23 03:38:23,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:38:23,476 INFO L470 AbstractCegarLoop]: Abstraction has 2669 states and 4787 transitions. [2021-11-23 03:38:23,476 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 2 states have internal predecessors, (66), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:38:23,477 INFO L276 IsEmpty]: Start isEmpty. Operand 2669 states and 4787 transitions. [2021-11-23 03:38:23,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-23 03:38:23,482 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:38:23,483 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:38:23,523 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:38:23,707 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-11-23 03:38:23,708 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:38:23,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:38:23,708 INFO L85 PathProgramCache]: Analyzing trace with hash -1279759823, now seen corresponding path program 1 times [2021-11-23 03:38:23,709 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:38:23,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [361968712] [2021-11-23 03:38:23,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:23,709 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:38:23,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:23,807 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:38:23,807 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:38:23,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [361968712] [2021-11-23 03:38:23,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [361968712] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:38:23,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [239876102] [2021-11-23 03:38:23,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:23,812 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:38:23,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:38:23,816 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:38:23,838 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:38:23,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:23,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 756 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:38:24,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:38:24,228 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-23 03:38:24,229 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:38:24,230 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [239876102] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:38:24,231 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:38:24,231 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:38:24,231 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [848363777] [2021-11-23 03:38:24,231 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:38:24,232 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:38:24,232 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:38:24,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:38:24,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:38:24,233 INFO L87 Difference]: Start difference. First operand 2669 states and 4787 transitions. Second operand has 3 states, 3 states have (on average 23.0) internal successors, (69), 2 states have internal predecessors, (69), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:38:24,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:38:24,737 INFO L93 Difference]: Finished difference Result 4690 states and 7848 transitions. [2021-11-23 03:38:24,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:38:24,740 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 2 states have internal predecessors, (69), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 108 [2021-11-23 03:38:24,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:38:24,768 INFO L225 Difference]: With dead ends: 4690 [2021-11-23 03:38:24,769 INFO L226 Difference]: Without dead ends: 3667 [2021-11-23 03:38:24,776 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:38:24,780 INFO L933 BasicCegarLoop]: 3273 mSDtfsCounter, 3453 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3453 SdHoareTripleChecker+Valid, 3438 SdHoareTripleChecker+Invalid, 294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:38:24,785 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3453 Valid, 3438 Invalid, 294 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 292 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:38:24,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3667 states. [2021-11-23 03:38:25,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3667 to 3657. [2021-11-23 03:38:25,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3657 states, 3291 states have (on average 1.7304770586447888) internal successors, (5695), 3301 states have internal predecessors, (5695), 268 states have call successors, (268), 96 states have call predecessors, (268), 96 states have return successors, (268), 260 states have call predecessors, (268), 268 states have call successors, (268) [2021-11-23 03:38:25,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3657 states to 3657 states and 6231 transitions. [2021-11-23 03:38:25,070 INFO L78 Accepts]: Start accepts. Automaton has 3657 states and 6231 transitions. Word has length 108 [2021-11-23 03:38:25,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:38:25,071 INFO L470 AbstractCegarLoop]: Abstraction has 3657 states and 6231 transitions. [2021-11-23 03:38:25,071 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 2 states have internal predecessors, (69), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:38:25,071 INFO L276 IsEmpty]: Start isEmpty. Operand 3657 states and 6231 transitions. [2021-11-23 03:38:25,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-23 03:38:25,078 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:38:25,078 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:38:25,115 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-23 03:38:25,303 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:38:25,304 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:38:25,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:38:25,304 INFO L85 PathProgramCache]: Analyzing trace with hash 1820964817, now seen corresponding path program 1 times [2021-11-23 03:38:25,304 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:38:25,305 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1624061878] [2021-11-23 03:38:25,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:25,305 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:38:25,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:25,375 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:38:25,375 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:38:25,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1624061878] [2021-11-23 03:38:25,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1624061878] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:38:25,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [488823079] [2021-11-23 03:38:25,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:25,376 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:38:25,376 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:38:25,377 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:38:25,392 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:38:25,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:25,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 750 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:38:25,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:38:25,736 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 03:38:25,736 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:38:25,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [488823079] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:38:25,736 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:38:25,737 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:38:25,737 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242391506] [2021-11-23 03:38:25,737 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:38:25,738 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:38:25,738 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:38:25,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:38:25,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:38:25,739 INFO L87 Difference]: Start difference. First operand 3657 states and 6231 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:38:26,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:38:26,280 INFO L93 Difference]: Finished difference Result 7630 states and 12212 transitions. [2021-11-23 03:38:26,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:38:26,281 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 108 [2021-11-23 03:38:26,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:38:26,320 INFO L225 Difference]: With dead ends: 7630 [2021-11-23 03:38:26,320 INFO L226 Difference]: Without dead ends: 5619 [2021-11-23 03:38:26,329 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:38:26,330 INFO L933 BasicCegarLoop]: 3246 mSDtfsCounter, 3441 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3441 SdHoareTripleChecker+Valid, 3411 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:38:26,331 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3441 Valid, 3411 Invalid, 291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 289 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:38:26,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5619 states. [2021-11-23 03:38:26,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5619 to 5601. [2021-11-23 03:38:26,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5601 states, 4891 states have (on average 1.6403598446125536) internal successors, (8023), 4909 states have internal predecessors, (8023), 516 states have call successors, (516), 192 states have call predecessors, (516), 192 states have return successors, (516), 500 states have call predecessors, (516), 516 states have call successors, (516) [2021-11-23 03:38:26,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5601 states to 5601 states and 9055 transitions. [2021-11-23 03:38:26,566 INFO L78 Accepts]: Start accepts. Automaton has 5601 states and 9055 transitions. Word has length 108 [2021-11-23 03:38:26,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:38:26,566 INFO L470 AbstractCegarLoop]: Abstraction has 5601 states and 9055 transitions. [2021-11-23 03:38:26,567 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:38:26,567 INFO L276 IsEmpty]: Start isEmpty. Operand 5601 states and 9055 transitions. [2021-11-23 03:38:26,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-23 03:38:26,578 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:38:26,578 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:38:26,616 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 03:38:26,803 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:38:26,804 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:38:26,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:38:26,804 INFO L85 PathProgramCache]: Analyzing trace with hash 128611697, now seen corresponding path program 1 times [2021-11-23 03:38:26,804 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:38:26,805 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [546428547] [2021-11-23 03:38:26,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:26,805 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:38:26,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:26,891 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-23 03:38:26,891 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:38:26,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [546428547] [2021-11-23 03:38:26,892 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [546428547] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:38:26,892 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:38:26,892 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:38:26,893 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184101192] [2021-11-23 03:38:26,893 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:38:26,893 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:38:26,893 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:38:26,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:38:26,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:38:26,895 INFO L87 Difference]: Start difference. First operand 5601 states and 9055 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 03:38:27,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:38:27,539 INFO L93 Difference]: Finished difference Result 8675 states and 13712 transitions. [2021-11-23 03:38:27,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:38:27,540 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 108 [2021-11-23 03:38:27,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:38:27,621 INFO L225 Difference]: With dead ends: 8675 [2021-11-23 03:38:27,623 INFO L226 Difference]: Without dead ends: 6657 [2021-11-23 03:38:27,631 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:38:27,636 INFO L933 BasicCegarLoop]: 3324 mSDtfsCounter, 91 mSDsluCounter, 3482 mSDsCounter, 0 mSdLazyCounter, 520 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 6562 SdHoareTripleChecker+Invalid, 520 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 520 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:38:27,637 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 6562 Invalid, 520 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 520 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:38:27,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6657 states. [2021-11-23 03:38:27,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6657 to 6321. [2021-11-23 03:38:27,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6321 states, 5579 states have (on average 1.6502957519268686) internal successors, (9207), 5597 states have internal predecessors, (9207), 532 states have call successors, (532), 208 states have call predecessors, (532), 208 states have return successors, (532), 516 states have call predecessors, (532), 532 states have call successors, (532) [2021-11-23 03:38:27,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6321 states to 6321 states and 10271 transitions. [2021-11-23 03:38:27,974 INFO L78 Accepts]: Start accepts. Automaton has 6321 states and 10271 transitions. Word has length 108 [2021-11-23 03:38:27,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:38:27,976 INFO L470 AbstractCegarLoop]: Abstraction has 6321 states and 10271 transitions. [2021-11-23 03:38:27,977 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 03:38:27,977 INFO L276 IsEmpty]: Start isEmpty. Operand 6321 states and 10271 transitions. [2021-11-23 03:38:28,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-23 03:38:28,019 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:38:28,020 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:38:28,020 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 03:38:28,020 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:38:28,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:38:28,020 INFO L85 PathProgramCache]: Analyzing trace with hash 1457677769, now seen corresponding path program 1 times [2021-11-23 03:38:28,021 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:38:28,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [778788049] [2021-11-23 03:38:28,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:28,021 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:38:28,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:28,127 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 03:38:28,127 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:38:28,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [778788049] [2021-11-23 03:38:28,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [778788049] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:38:28,128 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:38:28,128 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:38:28,128 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113643286] [2021-11-23 03:38:28,131 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:38:28,132 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:38:28,132 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:38:28,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:38:28,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:38:28,133 INFO L87 Difference]: Start difference. First operand 6321 states and 10271 transitions. Second operand has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:38:28,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:38:28,823 INFO L93 Difference]: Finished difference Result 15526 states and 24292 transitions. [2021-11-23 03:38:28,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:38:28,824 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 146 [2021-11-23 03:38:28,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:38:28,870 INFO L225 Difference]: With dead ends: 15526 [2021-11-23 03:38:28,870 INFO L226 Difference]: Without dead ends: 10851 [2021-11-23 03:38:28,889 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:38:28,891 INFO L933 BasicCegarLoop]: 3248 mSDtfsCounter, 3443 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 287 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3443 SdHoareTripleChecker+Valid, 3413 SdHoareTripleChecker+Invalid, 289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:38:28,891 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3443 Valid, 3413 Invalid, 289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 287 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:38:28,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10851 states. [2021-11-23 03:38:29,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10851 to 10801. [2021-11-23 03:38:29,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10801 states, 9355 states have (on average 1.5845002672367718) internal successors, (14823), 9389 states have internal predecessors, (14823), 1028 states have call successors, (1028), 416 states have call predecessors, (1028), 416 states have return successors, (1028), 996 states have call predecessors, (1028), 1028 states have call successors, (1028) [2021-11-23 03:38:29,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10801 states to 10801 states and 16879 transitions. [2021-11-23 03:38:29,566 INFO L78 Accepts]: Start accepts. Automaton has 10801 states and 16879 transitions. Word has length 146 [2021-11-23 03:38:29,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:38:29,567 INFO L470 AbstractCegarLoop]: Abstraction has 10801 states and 16879 transitions. [2021-11-23 03:38:29,567 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:38:29,568 INFO L276 IsEmpty]: Start isEmpty. Operand 10801 states and 16879 transitions. [2021-11-23 03:38:29,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-23 03:38:29,599 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:38:29,600 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:38:29,600 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 03:38:29,600 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:38:29,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:38:29,601 INFO L85 PathProgramCache]: Analyzing trace with hash 497899281, now seen corresponding path program 1 times [2021-11-23 03:38:29,601 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:38:29,601 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1051536380] [2021-11-23 03:38:29,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:29,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:38:29,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:29,698 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 03:38:29,698 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:38:29,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1051536380] [2021-11-23 03:38:29,699 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1051536380] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:38:29,699 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:38:29,699 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:38:29,699 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376896807] [2021-11-23 03:38:29,703 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:38:29,703 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:38:29,704 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:38:29,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:38:29,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:38:29,704 INFO L87 Difference]: Start difference. First operand 10801 states and 16879 transitions. Second operand has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:38:30,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:38:30,745 INFO L93 Difference]: Finished difference Result 28822 states and 44116 transitions. [2021-11-23 03:38:30,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:38:30,746 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 146 [2021-11-23 03:38:30,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:38:30,826 INFO L225 Difference]: With dead ends: 28822 [2021-11-23 03:38:30,826 INFO L226 Difference]: Without dead ends: 19667 [2021-11-23 03:38:30,863 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:38:30,864 INFO L933 BasicCegarLoop]: 3248 mSDtfsCounter, 3445 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 287 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3445 SdHoareTripleChecker+Valid, 3413 SdHoareTripleChecker+Invalid, 289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:38:30,864 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3445 Valid, 3413 Invalid, 289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 287 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:38:30,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19667 states. [2021-11-23 03:38:31,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19667 to 19569. [2021-11-23 03:38:31,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19569 states, 16747 states have (on average 1.536693139069684) internal successors, (25735), 16813 states have internal predecessors, (25735), 1988 states have call successors, (1988), 832 states have call predecessors, (1988), 832 states have return successors, (1988), 1924 states have call predecessors, (1988), 1988 states have call successors, (1988) [2021-11-23 03:38:31,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19569 states to 19569 states and 29711 transitions. [2021-11-23 03:38:31,624 INFO L78 Accepts]: Start accepts. Automaton has 19569 states and 29711 transitions. Word has length 146 [2021-11-23 03:38:31,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:38:31,625 INFO L470 AbstractCegarLoop]: Abstraction has 19569 states and 29711 transitions. [2021-11-23 03:38:31,625 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:38:31,625 INFO L276 IsEmpty]: Start isEmpty. Operand 19569 states and 29711 transitions. [2021-11-23 03:38:31,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-23 03:38:31,685 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:38:31,685 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:38:31,685 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 03:38:31,685 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:38:31,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:38:31,696 INFO L85 PathProgramCache]: Analyzing trace with hash 1129602500, now seen corresponding path program 1 times [2021-11-23 03:38:31,697 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:38:31,697 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1872391325] [2021-11-23 03:38:31,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:31,697 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:38:31,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:31,790 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 03:38:31,790 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:38:31,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1872391325] [2021-11-23 03:38:31,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1872391325] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:38:31,791 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:38:31,791 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:38:31,791 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97778876] [2021-11-23 03:38:31,791 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:38:31,792 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:38:31,792 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:38:31,793 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:38:31,793 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:38:31,793 INFO L87 Difference]: Start difference. First operand 19569 states and 29711 transitions. Second operand has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:38:33,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:38:33,620 INFO L93 Difference]: Finished difference Result 54838 states and 82580 transitions. [2021-11-23 03:38:33,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:38:33,621 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 146 [2021-11-23 03:38:33,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:38:33,778 INFO L225 Difference]: With dead ends: 54838 [2021-11-23 03:38:33,778 INFO L226 Difference]: Without dead ends: 36915 [2021-11-23 03:38:33,843 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:38:33,845 INFO L933 BasicCegarLoop]: 3248 mSDtfsCounter, 3447 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 287 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3447 SdHoareTripleChecker+Valid, 3413 SdHoareTripleChecker+Invalid, 289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:38:33,846 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3447 Valid, 3413 Invalid, 289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 287 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:38:33,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36915 states. [2021-11-23 03:38:35,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36915 to 36721. [2021-11-23 03:38:35,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36721 states, 31211 states have (on average 1.5032840985549967) internal successors, (46919), 31341 states have internal predecessors, (46919), 3844 states have call successors, (3844), 1664 states have call predecessors, (3844), 1664 states have return successors, (3844), 3716 states have call predecessors, (3844), 3844 states have call successors, (3844) [2021-11-23 03:38:35,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36721 states to 36721 states and 54607 transitions. [2021-11-23 03:38:35,757 INFO L78 Accepts]: Start accepts. Automaton has 36721 states and 54607 transitions. Word has length 146 [2021-11-23 03:38:35,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:38:35,758 INFO L470 AbstractCegarLoop]: Abstraction has 36721 states and 54607 transitions. [2021-11-23 03:38:35,758 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:38:35,758 INFO L276 IsEmpty]: Start isEmpty. Operand 36721 states and 54607 transitions. [2021-11-23 03:38:35,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-23 03:38:35,855 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:38:35,855 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:38:35,855 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 03:38:35,856 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:38:35,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:38:35,856 INFO L85 PathProgramCache]: Analyzing trace with hash -249283214, now seen corresponding path program 1 times [2021-11-23 03:38:35,856 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:38:35,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [674212669] [2021-11-23 03:38:35,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:35,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:38:35,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:35,932 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 03:38:35,933 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:38:35,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [674212669] [2021-11-23 03:38:35,934 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [674212669] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:38:35,934 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:38:35,934 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:38:35,934 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837870463] [2021-11-23 03:38:35,935 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:38:35,935 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:38:35,935 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:38:35,936 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:38:35,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:38:35,936 INFO L87 Difference]: Start difference. First operand 36721 states and 54607 transitions. Second operand has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:38:38,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:38:38,214 INFO L93 Difference]: Finished difference Result 105718 states and 157140 transitions. [2021-11-23 03:38:38,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:38:38,215 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 146 [2021-11-23 03:38:38,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:38:38,520 INFO L225 Difference]: With dead ends: 105718 [2021-11-23 03:38:38,521 INFO L226 Difference]: Without dead ends: 70643 [2021-11-23 03:38:38,608 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:38:38,609 INFO L933 BasicCegarLoop]: 3262 mSDtfsCounter, 3450 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 287 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3450 SdHoareTripleChecker+Valid, 3427 SdHoareTripleChecker+Invalid, 289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:38:38,610 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3450 Valid, 3427 Invalid, 289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 287 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:38:38,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70643 states. [2021-11-23 03:38:40,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70643 to 70257. [2021-11-23 03:38:41,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70257 states, 59499 states have (on average 1.4791341030941696) internal successors, (88007), 59757 states have internal predecessors, (88007), 7428 states have call successors, (7428), 3328 states have call predecessors, (7428), 3328 states have return successors, (7428), 7172 states have call predecessors, (7428), 7428 states have call successors, (7428) [2021-11-23 03:38:41,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70257 states to 70257 states and 102863 transitions. [2021-11-23 03:38:41,754 INFO L78 Accepts]: Start accepts. Automaton has 70257 states and 102863 transitions. Word has length 146 [2021-11-23 03:38:41,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:38:41,755 INFO L470 AbstractCegarLoop]: Abstraction has 70257 states and 102863 transitions. [2021-11-23 03:38:41,755 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:38:41,755 INFO L276 IsEmpty]: Start isEmpty. Operand 70257 states and 102863 transitions. [2021-11-23 03:38:41,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-11-23 03:38:41,964 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:38:41,965 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 03:38:41,965 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-23 03:38:41,965 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:38:41,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:38:41,966 INFO L85 PathProgramCache]: Analyzing trace with hash 492459909, now seen corresponding path program 1 times [2021-11-23 03:38:41,966 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:38:41,966 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1135992043] [2021-11-23 03:38:41,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:41,967 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:38:41,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:42,123 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 19 proven. 59 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-23 03:38:42,123 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:38:42,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1135992043] [2021-11-23 03:38:42,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1135992043] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:38:42,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [795068236] [2021-11-23 03:38:42,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:42,124 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:38:42,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:38:42,128 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:38:42,151 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 03:38:42,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:42,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 987 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:38:42,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:38:42,624 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 93 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-23 03:38:42,625 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:38:42,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [795068236] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:38:42,625 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:38:42,625 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 03:38:42,628 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [895584482] [2021-11-23 03:38:42,628 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:38:42,629 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:38:42,629 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:38:42,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:38:42,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:38:42,630 INFO L87 Difference]: Start difference. First operand 70257 states and 102863 transitions. Second operand has 3 states, 3 states have (on average 39.0) internal successors, (117), 3 states have internal predecessors, (117), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:38:45,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:38:45,796 INFO L93 Difference]: Finished difference Result 133109 states and 196305 transitions. [2021-11-23 03:38:45,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:38:45,797 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 39.0) internal successors, (117), 3 states have internal predecessors, (117), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 167 [2021-11-23 03:38:45,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:38:46,187 INFO L225 Difference]: With dead ends: 133109 [2021-11-23 03:38:46,187 INFO L226 Difference]: Without dead ends: 98035 [2021-11-23 03:38:46,558 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 175 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:38:46,559 INFO L933 BasicCegarLoop]: 3363 mSDtfsCounter, 140 mSDsluCounter, 3483 mSDsCounter, 0 mSdLazyCounter, 526 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 6603 SdHoareTripleChecker+Invalid, 526 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 526 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 03:38:46,560 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [140 Valid, 6603 Invalid, 526 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 526 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 03:38:46,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98035 states. [2021-11-23 03:38:49,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98035 to 85105. [2021-11-23 03:38:49,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85105 states, 73579 states have (on average 1.5196591418747196) internal successors, (111815), 73837 states have internal predecessors, (111815), 7812 states have call successors, (7812), 3712 states have call predecessors, (7812), 3712 states have return successors, (7812), 7556 states have call predecessors, (7812), 7812 states have call successors, (7812) [2021-11-23 03:38:50,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85105 states to 85105 states and 127439 transitions. [2021-11-23 03:38:50,434 INFO L78 Accepts]: Start accepts. Automaton has 85105 states and 127439 transitions. Word has length 167 [2021-11-23 03:38:50,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:38:50,437 INFO L470 AbstractCegarLoop]: Abstraction has 85105 states and 127439 transitions. [2021-11-23 03:38:50,437 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 39.0) internal successors, (117), 3 states have internal predecessors, (117), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:38:50,437 INFO L276 IsEmpty]: Start isEmpty. Operand 85105 states and 127439 transitions. [2021-11-23 03:38:50,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-11-23 03:38:50,713 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:38:50,713 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 03:38:50,755 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 03:38:50,939 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:38:50,940 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:38:50,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:38:50,940 INFO L85 PathProgramCache]: Analyzing trace with hash 2017556159, now seen corresponding path program 2 times [2021-11-23 03:38:50,940 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:38:50,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1863491951] [2021-11-23 03:38:50,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:50,941 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:38:50,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:51,063 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 10 proven. 57 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 03:38:51,063 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:38:51,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1863491951] [2021-11-23 03:38:51,064 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1863491951] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:38:51,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2020739489] [2021-11-23 03:38:51,064 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:38:51,064 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:38:51,064 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:38:51,065 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:38:51,081 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 03:38:51,238 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 03:38:51,238 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:38:51,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 643 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:38:51,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:38:51,490 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 76 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-23 03:38:51,491 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:38:51,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2020739489] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:38:51,491 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:38:51,492 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 03:38:51,493 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954379438] [2021-11-23 03:38:51,493 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:38:51,494 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:38:51,494 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:38:51,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:38:51,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:38:51,495 INFO L87 Difference]: Start difference. First operand 85105 states and 127439 transitions. Second operand has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:38:54,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:38:54,556 INFO L93 Difference]: Finished difference Result 135285 states and 205777 transitions. [2021-11-23 03:38:54,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:38:54,557 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 167 [2021-11-23 03:38:54,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:38:54,865 INFO L225 Difference]: With dead ends: 135285 [2021-11-23 03:38:54,865 INFO L226 Difference]: Without dead ends: 85363 [2021-11-23 03:38:54,959 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 169 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:38:54,961 INFO L933 BasicCegarLoop]: 3385 mSDtfsCounter, 171 mSDsluCounter, 3468 mSDsCounter, 0 mSdLazyCounter, 530 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 6608 SdHoareTripleChecker+Invalid, 533 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 530 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:38:54,961 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [171 Valid, 6608 Invalid, 533 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 530 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 03:38:55,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85363 states. [2021-11-23 03:38:57,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85363 to 84849. [2021-11-23 03:38:57,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84849 states, 73323 states have (on average 1.5075078761098155) internal successors, (110535), 73581 states have internal predecessors, (110535), 7812 states have call successors, (7812), 3712 states have call predecessors, (7812), 3712 states have return successors, (7812), 7556 states have call predecessors, (7812), 7812 states have call successors, (7812) [2021-11-23 03:38:58,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84849 states to 84849 states and 126159 transitions. [2021-11-23 03:38:58,025 INFO L78 Accepts]: Start accepts. Automaton has 84849 states and 126159 transitions. Word has length 167 [2021-11-23 03:38:58,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:38:58,026 INFO L470 AbstractCegarLoop]: Abstraction has 84849 states and 126159 transitions. [2021-11-23 03:38:58,027 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:38:58,027 INFO L276 IsEmpty]: Start isEmpty. Operand 84849 states and 126159 transitions. [2021-11-23 03:38:58,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-11-23 03:38:58,245 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:38:58,245 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:38:58,285 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 03:38:58,459 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-23 03:38:58,460 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:38:58,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:38:58,460 INFO L85 PathProgramCache]: Analyzing trace with hash -1760770367, now seen corresponding path program 1 times [2021-11-23 03:38:58,460 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:38:58,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1051543496] [2021-11-23 03:38:58,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:58,461 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:38:58,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:58,565 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 10 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 03:38:58,565 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:38:58,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1051543496] [2021-11-23 03:38:58,565 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1051543496] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:38:58,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [312192635] [2021-11-23 03:38:58,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:38:58,566 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:38:58,566 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:38:58,567 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:38:58,591 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 03:38:58,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:38:58,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 993 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:38:58,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:38:59,073 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 94 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 03:38:59,074 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:38:59,074 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [312192635] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:38:59,074 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:38:59,074 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 03:38:59,074 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29327652] [2021-11-23 03:38:59,074 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:38:59,075 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:38:59,075 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:38:59,075 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:38:59,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:38:59,076 INFO L87 Difference]: Start difference. First operand 84849 states and 126159 transitions. Second operand has 3 states, 3 states have (on average 40.333333333333336) internal successors, (121), 3 states have internal predecessors, (121), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:39:02,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:39:02,045 INFO L93 Difference]: Finished difference Result 127669 states and 191953 transitions. [2021-11-23 03:39:02,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:39:02,045 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 40.333333333333336) internal successors, (121), 3 states have internal predecessors, (121), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 167 [2021-11-23 03:39:02,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:39:02,337 INFO L225 Difference]: With dead ends: 127669 [2021-11-23 03:39:02,338 INFO L226 Difference]: Without dead ends: 85107 [2021-11-23 03:39:02,437 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 169 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:39:02,438 INFO L933 BasicCegarLoop]: 3373 mSDtfsCounter, 172 mSDsluCounter, 3467 mSDsCounter, 0 mSdLazyCounter, 530 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 172 SdHoareTripleChecker+Valid, 6595 SdHoareTripleChecker+Invalid, 532 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 530 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:39:02,439 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [172 Valid, 6595 Invalid, 532 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 530 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:39:02,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85107 states. [2021-11-23 03:39:04,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85107 to 84209. [2021-11-23 03:39:04,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84209 states, 72683 states have (on average 1.4926048732165706) internal successors, (108487), 72941 states have internal predecessors, (108487), 7812 states have call successors, (7812), 3712 states have call predecessors, (7812), 3712 states have return successors, (7812), 7556 states have call predecessors, (7812), 7812 states have call successors, (7812) [2021-11-23 03:39:05,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84209 states to 84209 states and 124111 transitions. [2021-11-23 03:39:05,298 INFO L78 Accepts]: Start accepts. Automaton has 84209 states and 124111 transitions. Word has length 167 [2021-11-23 03:39:05,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:39:05,299 INFO L470 AbstractCegarLoop]: Abstraction has 84209 states and 124111 transitions. [2021-11-23 03:39:05,299 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 40.333333333333336) internal successors, (121), 3 states have internal predecessors, (121), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:39:05,300 INFO L276 IsEmpty]: Start isEmpty. Operand 84209 states and 124111 transitions. [2021-11-23 03:39:05,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-11-23 03:39:05,548 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:39:05,548 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:39:05,594 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 03:39:05,763 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-23 03:39:05,764 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:39:05,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:39:05,764 INFO L85 PathProgramCache]: Analyzing trace with hash 209644543, now seen corresponding path program 1 times [2021-11-23 03:39:05,764 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:39:05,765 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1504693380] [2021-11-23 03:39:05,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:39:05,765 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:39:05,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:39:05,898 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 10 proven. 53 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 03:39:05,898 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:39:05,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1504693380] [2021-11-23 03:39:05,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1504693380] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:39:05,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [40610080] [2021-11-23 03:39:05,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:39:05,899 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:39:05,899 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:39:05,900 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:39:05,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd05629f-7066-4957-8036-c99909f73859/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 03:39:06,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:39:06,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 999 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:39:06,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:39:06,418 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 84 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 03:39:06,419 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:39:06,419 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [40610080] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:39:06,419 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:39:06,419 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 03:39:06,420 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525417287] [2021-11-23 03:39:06,420 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:39:06,420 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:39:06,421 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:39:06,421 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:39:06,421 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:39:06,422 INFO L87 Difference]: Start difference. First operand 84209 states and 124111 transitions. Second operand has 3 states, 3 states have (on average 39.0) internal successors, (117), 3 states have internal predecessors, (117), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10)