./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/toy.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 38b53e6a Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/toy.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur --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 4a8eabec1830ab654b41f6937ec2f9359cd3dd371ede66eafc352bac48edda3b --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-38b53e6 [2022-11-25 22:13:03,650 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-25 22:13:03,653 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-25 22:13:03,696 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-25 22:13:03,697 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-25 22:13:03,700 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-25 22:13:03,704 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-25 22:13:03,707 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-25 22:13:03,709 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-25 22:13:03,712 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-25 22:13:03,713 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-25 22:13:03,715 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-25 22:13:03,715 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-25 22:13:03,716 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-25 22:13:03,718 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-25 22:13:03,719 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-25 22:13:03,720 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-25 22:13:03,721 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-25 22:13:03,723 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-25 22:13:03,725 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-25 22:13:03,735 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-25 22:13:03,737 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-25 22:13:03,738 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-25 22:13:03,739 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-25 22:13:03,742 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-25 22:13:03,743 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-25 22:13:03,743 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-25 22:13:03,744 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-25 22:13:03,745 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-25 22:13:03,746 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-25 22:13:03,746 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-25 22:13:03,747 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-25 22:13:03,748 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-25 22:13:03,749 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-25 22:13:03,750 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-25 22:13:03,750 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-25 22:13:03,751 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-25 22:13:03,751 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-25 22:13:03,752 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-25 22:13:03,764 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-25 22:13:03,765 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-25 22:13:03,768 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-25 22:13:03,804 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-25 22:13:03,804 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-25 22:13:03,805 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-25 22:13:03,805 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-25 22:13:03,806 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-25 22:13:03,807 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-25 22:13:03,807 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-25 22:13:03,807 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-25 22:13:03,807 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-25 22:13:03,808 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-25 22:13:03,809 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-25 22:13:03,809 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-25 22:13:03,809 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-25 22:13:03,809 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-25 22:13:03,810 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-25 22:13:03,810 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-25 22:13:03,810 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-25 22:13:03,810 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-25 22:13:03,811 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-25 22:13:03,811 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-25 22:13:03,811 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-25 22:13:03,812 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-25 22:13:03,812 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-25 22:13:03,812 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-25 22:13:03,812 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-25 22:13:03,813 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-25 22:13:03,813 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-25 22:13:03,813 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-25 22:13:03,814 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-25 22:13:03,814 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-25 22:13:03,814 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-25 22:13:03,815 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-25 22:13:03,815 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 22:13:03,815 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-25 22:13:03,816 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-25 22:13:03,816 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-25 22:13:03,816 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-25 22:13:03,817 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-25 22:13:03,817 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-25 22:13:03,817 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-25 22:13:03,817 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-25 22:13:03,817 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4a8eabec1830ab654b41f6937ec2f9359cd3dd371ede66eafc352bac48edda3b [2022-11-25 22:13:04,113 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-25 22:13:04,182 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-25 22:13:04,185 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-25 22:13:04,186 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-25 22:13:04,206 INFO L275 PluginConnector]: CDTParser initialized [2022-11-25 22:13:04,207 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/systemc/toy.cil.c [2022-11-25 22:13:07,115 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-25 22:13:07,397 INFO L351 CDTParser]: Found 1 translation units. [2022-11-25 22:13:07,400 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/sv-benchmarks/c/systemc/toy.cil.c [2022-11-25 22:13:07,421 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/data/8eeea0cdc/c2dc00ffdfb1466485565ab57005ae19/FLAGc3e45bf3e [2022-11-25 22:13:07,444 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/data/8eeea0cdc/c2dc00ffdfb1466485565ab57005ae19 [2022-11-25 22:13:07,450 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-25 22:13:07,452 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-25 22:13:07,456 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-25 22:13:07,456 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-25 22:13:07,460 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-25 22:13:07,461 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 10:13:07" (1/1) ... [2022-11-25 22:13:07,463 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7d979987 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:07, skipping insertion in model container [2022-11-25 22:13:07,463 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 10:13:07" (1/1) ... [2022-11-25 22:13:07,471 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-25 22:13:07,503 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-25 22:13:07,714 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/sv-benchmarks/c/systemc/toy.cil.c[697,710] [2022-11-25 22:13:07,835 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 22:13:07,860 INFO L203 MainTranslator]: Completed pre-run [2022-11-25 22:13:07,875 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/sv-benchmarks/c/systemc/toy.cil.c[697,710] [2022-11-25 22:13:07,939 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 22:13:07,956 INFO L208 MainTranslator]: Completed translation [2022-11-25 22:13:07,957 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:07 WrapperNode [2022-11-25 22:13:07,957 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-25 22:13:07,959 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-25 22:13:07,959 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-25 22:13:07,959 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-25 22:13:07,967 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:07" (1/1) ... [2022-11-25 22:13:07,997 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:07" (1/1) ... [2022-11-25 22:13:08,022 INFO L138 Inliner]: procedures = 20, calls = 15, calls flagged for inlining = 10, calls inlined = 10, statements flattened = 362 [2022-11-25 22:13:08,022 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-25 22:13:08,023 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-25 22:13:08,023 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-25 22:13:08,024 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-25 22:13:08,034 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:07" (1/1) ... [2022-11-25 22:13:08,034 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:07" (1/1) ... [2022-11-25 22:13:08,041 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:07" (1/1) ... [2022-11-25 22:13:08,052 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:07" (1/1) ... [2022-11-25 22:13:08,059 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:07" (1/1) ... [2022-11-25 22:13:08,079 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:07" (1/1) ... [2022-11-25 22:13:08,092 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:07" (1/1) ... [2022-11-25 22:13:08,094 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:07" (1/1) ... [2022-11-25 22:13:08,097 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-25 22:13:08,098 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-25 22:13:08,098 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-25 22:13:08,105 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-25 22:13:08,106 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:07" (1/1) ... [2022-11-25 22:13:08,113 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 22:13:08,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:13:08,139 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-25 22:13:08,144 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-25 22:13:08,183 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-25 22:13:08,183 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-25 22:13:08,183 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-25 22:13:08,183 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-25 22:13:08,261 INFO L235 CfgBuilder]: Building ICFG [2022-11-25 22:13:08,263 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-25 22:13:08,937 INFO L276 CfgBuilder]: Performing block encoding [2022-11-25 22:13:09,334 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-25 22:13:09,334 INFO L300 CfgBuilder]: Removed 6 assume(true) statements. [2022-11-25 22:13:09,337 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 10:13:09 BoogieIcfgContainer [2022-11-25 22:13:09,337 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-25 22:13:09,340 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-25 22:13:09,341 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-25 22:13:09,344 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-25 22:13:09,344 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 10:13:07" (1/3) ... [2022-11-25 22:13:09,347 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22b6458c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 10:13:09, skipping insertion in model container [2022-11-25 22:13:09,347 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:13:07" (2/3) ... [2022-11-25 22:13:09,348 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22b6458c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 10:13:09, skipping insertion in model container [2022-11-25 22:13:09,348 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 10:13:09" (3/3) ... [2022-11-25 22:13:09,350 INFO L112 eAbstractionObserver]: Analyzing ICFG toy.cil.c [2022-11-25 22:13:09,373 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-25 22:13:09,373 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-25 22:13:09,439 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-25 22:13:09,449 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@421ce44e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-25 22:13:09,450 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-25 22:13:09,454 INFO L276 IsEmpty]: Start isEmpty. Operand has 43 states, 41 states have (on average 1.6829268292682926) internal successors, (69), 42 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:13:09,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-25 22:13:09,462 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:13:09,463 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:13:09,463 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:13:09,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:13:09,471 INFO L85 PathProgramCache]: Analyzing trace with hash -1044848161, now seen corresponding path program 1 times [2022-11-25 22:13:09,483 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:13:09,483 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [207390858] [2022-11-25 22:13:09,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:13:09,484 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:13:09,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:13:09,859 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:13:09,860 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:13:09,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [207390858] [2022-11-25 22:13:09,861 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [207390858] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 22:13:09,861 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 22:13:09,862 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-25 22:13:09,864 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [980604017] [2022-11-25 22:13:09,865 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 22:13:09,869 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 22:13:09,871 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:13:09,902 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 22:13:09,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 22:13:09,905 INFO L87 Difference]: Start difference. First operand has 43 states, 41 states have (on average 1.6829268292682926) internal successors, (69), 42 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 2 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:13:10,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:13:10,079 INFO L93 Difference]: Finished difference Result 111 states and 179 transitions. [2022-11-25 22:13:10,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 22:13:10,083 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 2 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-25 22:13:10,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:13:10,094 INFO L225 Difference]: With dead ends: 111 [2022-11-25 22:13:10,095 INFO L226 Difference]: Without dead ends: 66 [2022-11-25 22:13:10,098 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 22:13:10,105 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 35 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 22:13:10,106 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 85 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 22:13:10,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-25 22:13:10,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2022-11-25 22:13:10,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.546875) internal successors, (99), 64 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:13:10,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 99 transitions. [2022-11-25 22:13:10,153 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 99 transitions. Word has length 14 [2022-11-25 22:13:10,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:13:10,155 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 99 transitions. [2022-11-25 22:13:10,155 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 2 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:13:10,156 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 99 transitions. [2022-11-25 22:13:10,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-25 22:13:10,157 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:13:10,157 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:13:10,157 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-25 22:13:10,158 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:13:10,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:13:10,158 INFO L85 PathProgramCache]: Analyzing trace with hash -2144864400, now seen corresponding path program 1 times [2022-11-25 22:13:10,159 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:13:10,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1210573142] [2022-11-25 22:13:10,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:13:10,159 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:13:10,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:13:10,507 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:13:10,508 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:13:10,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1210573142] [2022-11-25 22:13:10,509 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1210573142] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:13:10,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [926105105] [2022-11-25 22:13:10,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:13:10,510 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:13:10,510 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:13:10,517 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:13:10,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-25 22:13:10,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:13:10,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-25 22:13:10,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:13:10,687 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:13:10,688 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 22:13:10,692 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [926105105] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 22:13:10,692 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 22:13:10,693 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2022-11-25 22:13:10,694 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2095393445] [2022-11-25 22:13:10,695 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 22:13:10,696 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 22:13:10,696 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:13:10,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 22:13:10,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-25 22:13:10,698 INFO L87 Difference]: Start difference. First operand 65 states and 99 transitions. Second operand has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:13:10,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:13:10,805 INFO L93 Difference]: Finished difference Result 131 states and 204 transitions. [2022-11-25 22:13:10,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 22:13:10,808 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2022-11-25 22:13:10,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:13:10,811 INFO L225 Difference]: With dead ends: 131 [2022-11-25 22:13:10,812 INFO L226 Difference]: Without dead ends: 95 [2022-11-25 22:13:10,812 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-25 22:13:10,815 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 44 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 22:13:10,816 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 73 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 22:13:10,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-11-25 22:13:10,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 92. [2022-11-25 22:13:10,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 91 states have (on average 1.5604395604395604) internal successors, (142), 91 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:13:10,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 142 transitions. [2022-11-25 22:13:10,835 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 142 transitions. Word has length 23 [2022-11-25 22:13:10,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:13:10,836 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 142 transitions. [2022-11-25 22:13:10,836 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:13:10,836 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 142 transitions. [2022-11-25 22:13:10,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-25 22:13:10,839 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:13:10,840 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:13:10,854 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-25 22:13:11,045 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2022-11-25 22:13:11,046 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:13:11,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:13:11,047 INFO L85 PathProgramCache]: Analyzing trace with hash -1115500790, now seen corresponding path program 1 times [2022-11-25 22:13:11,047 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:13:11,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1978215463] [2022-11-25 22:13:11,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:13:11,048 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:13:11,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:13:11,328 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 22:13:11,328 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:13:11,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1978215463] [2022-11-25 22:13:11,329 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1978215463] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:13:11,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [528582192] [2022-11-25 22:13:11,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:13:11,329 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:13:11,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:13:11,331 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:13:11,362 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-25 22:13:11,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:13:11,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-25 22:13:11,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:13:11,469 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-25 22:13:11,469 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 22:13:11,469 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [528582192] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 22:13:11,469 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 22:13:11,470 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2022-11-25 22:13:11,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085232816] [2022-11-25 22:13:11,470 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 22:13:11,470 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 22:13:11,470 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:13:11,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 22:13:11,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-25 22:13:11,471 INFO L87 Difference]: Start difference. First operand 92 states and 142 transitions. Second operand has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 3 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:13:11,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:13:11,557 INFO L93 Difference]: Finished difference Result 187 states and 296 transitions. [2022-11-25 22:13:11,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 22:13:11,557 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 3 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2022-11-25 22:13:11,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:13:11,562 INFO L225 Difference]: With dead ends: 187 [2022-11-25 22:13:11,562 INFO L226 Difference]: Without dead ends: 124 [2022-11-25 22:13:11,563 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-25 22:13:11,566 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 20 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 22:13:11,568 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 102 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 22:13:11,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-11-25 22:13:11,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 112. [2022-11-25 22:13:11,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 111 states have (on average 1.5675675675675675) internal successors, (174), 111 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:13:11,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 174 transitions. [2022-11-25 22:13:11,590 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 174 transitions. Word has length 34 [2022-11-25 22:13:11,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:13:11,591 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 174 transitions. [2022-11-25 22:13:11,592 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 3 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:13:11,593 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 174 transitions. [2022-11-25 22:13:11,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-25 22:13:11,598 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:13:11,598 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:13:11,609 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-25 22:13:11,809 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:13:11,809 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:13:11,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:13:11,810 INFO L85 PathProgramCache]: Analyzing trace with hash 1390953451, now seen corresponding path program 1 times [2022-11-25 22:13:11,810 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:13:11,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1220341814] [2022-11-25 22:13:11,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:13:11,810 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:13:11,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:13:11,877 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-25 22:13:11,877 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:13:11,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1220341814] [2022-11-25 22:13:11,878 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1220341814] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 22:13:11,878 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 22:13:11,878 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 22:13:11,878 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1259723825] [2022-11-25 22:13:11,878 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 22:13:11,879 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 22:13:11,879 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:13:11,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 22:13:11,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 22:13:11,880 INFO L87 Difference]: Start difference. First operand 112 states and 174 transitions. Second operand has 3 states, 3 states have (on average 12.0) internal successors, (36), 3 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:13:11,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:13:11,932 INFO L93 Difference]: Finished difference Result 248 states and 391 transitions. [2022-11-25 22:13:11,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 22:13:11,932 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.0) internal successors, (36), 3 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2022-11-25 22:13:11,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:13:11,933 INFO L225 Difference]: With dead ends: 248 [2022-11-25 22:13:11,933 INFO L226 Difference]: Without dead ends: 165 [2022-11-25 22:13:11,934 INFO L412 NwaCegarLoop]: 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 [2022-11-25 22:13:11,935 INFO L413 NwaCegarLoop]: 70 mSDtfsCounter, 33 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 22:13:11,935 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 114 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 22:13:11,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2022-11-25 22:13:11,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 160. [2022-11-25 22:13:11,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 159 states have (on average 1.5974842767295598) internal successors, (254), 159 states have internal predecessors, (254), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:13:11,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 254 transitions. [2022-11-25 22:13:11,962 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 254 transitions. Word has length 42 [2022-11-25 22:13:11,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:13:11,962 INFO L495 AbstractCegarLoop]: Abstraction has 160 states and 254 transitions. [2022-11-25 22:13:11,963 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.0) internal successors, (36), 3 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:13:11,963 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 254 transitions. [2022-11-25 22:13:11,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-25 22:13:11,968 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:13:11,968 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:13:11,968 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-25 22:13:11,968 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:13:11,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:13:11,969 INFO L85 PathProgramCache]: Analyzing trace with hash 124245258, now seen corresponding path program 1 times [2022-11-25 22:13:11,969 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:13:11,969 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1016563213] [2022-11-25 22:13:11,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:13:11,970 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:13:11,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:13:12,026 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-25 22:13:12,026 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:13:12,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1016563213] [2022-11-25 22:13:12,027 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1016563213] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 22:13:12,027 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 22:13:12,027 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 22:13:12,027 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436731065] [2022-11-25 22:13:12,027 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 22:13:12,028 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 22:13:12,028 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:13:12,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 22:13:12,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 22:13:12,029 INFO L87 Difference]: Start difference. First operand 160 states and 254 transitions. Second operand has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:13:12,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:13:12,098 INFO L93 Difference]: Finished difference Result 295 states and 472 transitions. [2022-11-25 22:13:12,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 22:13:12,098 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2022-11-25 22:13:12,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:13:12,099 INFO L225 Difference]: With dead ends: 295 [2022-11-25 22:13:12,100 INFO L226 Difference]: Without dead ends: 164 [2022-11-25 22:13:12,100 INFO L412 NwaCegarLoop]: 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 [2022-11-25 22:13:12,101 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 41 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 22:13:12,102 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 106 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 22:13:12,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2022-11-25 22:13:12,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 162. [2022-11-25 22:13:12,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 161 states have (on average 1.5590062111801242) internal successors, (251), 161 states have internal predecessors, (251), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:13:12,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 251 transitions. [2022-11-25 22:13:12,128 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 251 transitions. Word has length 42 [2022-11-25 22:13:12,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:13:12,128 INFO L495 AbstractCegarLoop]: Abstraction has 162 states and 251 transitions. [2022-11-25 22:13:12,129 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:13:12,130 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 251 transitions. [2022-11-25 22:13:12,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-25 22:13:12,133 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:13:12,133 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:13:12,133 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-25 22:13:12,133 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:13:12,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:13:12,134 INFO L85 PathProgramCache]: Analyzing trace with hash 543419851, now seen corresponding path program 1 times [2022-11-25 22:13:12,134 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:13:12,134 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [179651429] [2022-11-25 22:13:12,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:13:12,135 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:13:12,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:13:12,220 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:13:12,220 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:13:12,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [179651429] [2022-11-25 22:13:12,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [179651429] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 22:13:12,221 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 22:13:12,221 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 22:13:12,221 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325917402] [2022-11-25 22:13:12,222 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 22:13:12,222 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 22:13:12,222 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:13:12,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 22:13:12,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 22:13:12,223 INFO L87 Difference]: Start difference. First operand 162 states and 251 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:13:12,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:13:12,280 INFO L93 Difference]: Finished difference Result 375 states and 576 transitions. [2022-11-25 22:13:12,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 22:13:12,280 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2022-11-25 22:13:12,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:13:12,282 INFO L225 Difference]: With dead ends: 375 [2022-11-25 22:13:12,282 INFO L226 Difference]: Without dead ends: 217 [2022-11-25 22:13:12,282 INFO L412 NwaCegarLoop]: 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 [2022-11-25 22:13:12,283 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 28 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 22:13:12,284 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 111 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 22:13:12,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2022-11-25 22:13:12,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 174. [2022-11-25 22:13:12,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 173 states have (on average 1.5144508670520231) internal successors, (262), 173 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:13:12,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 262 transitions. [2022-11-25 22:13:12,295 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 262 transitions. Word has length 43 [2022-11-25 22:13:12,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:13:12,295 INFO L495 AbstractCegarLoop]: Abstraction has 174 states and 262 transitions. [2022-11-25 22:13:12,296 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:13:12,296 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 262 transitions. [2022-11-25 22:13:12,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-25 22:13:12,297 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:13:12,297 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 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] [2022-11-25 22:13:12,297 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-25 22:13:12,297 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:13:12,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:13:12,298 INFO L85 PathProgramCache]: Analyzing trace with hash 510593940, now seen corresponding path program 1 times [2022-11-25 22:13:12,298 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:13:12,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1627971835] [2022-11-25 22:13:12,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:13:12,298 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:13:12,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:13:12,959 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 13 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:13:12,961 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:13:12,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1627971835] [2022-11-25 22:13:12,962 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1627971835] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:13:12,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [819819793] [2022-11-25 22:13:12,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:13:12,962 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:13:12,962 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:13:12,966 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:13:12,989 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-25 22:13:13,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:13:13,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-25 22:13:13,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:13:14,736 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 13 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:13:14,737 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:13:17,594 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 1 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:13:17,594 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [819819793] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:13:17,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1830861139] [2022-11-25 22:13:17,613 INFO L159 IcfgInterpreter]: Started Sifa with 34 locations of interest [2022-11-25 22:13:17,614 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:13:17,617 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:13:17,622 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:13:17,623 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:15:58,829 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:16:17,153 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3307#(and (<= 0 (+ |ULTIMATE.start_eval_~tmp~0#1| 2147483648)) (= ~wl_i~0 1) (<= 0 ~wb_pc~0) (<= 0 ~t_b~0) (<= 0 ~data~0) (<= 0 ~c1_pc~0) (<= 0 ~d~0) (not (= ~d~0 (+ |ULTIMATE.start_write_loop_~t~0#1| 1))) (<= 0 ~c_t~0) (= ~p_in~0 0) (<= |ULTIMATE.start_eval_~tmp~0#1| 2147483647) (<= ~c1_i~0 1) (= ~r_i~0 0) (<= 0 ~c2_pc~0) (<= 1 ~c1_i~0) (= |ULTIMATE.start_start_simulation_~kernel_st~0#1| 1) (<= 0 ~c~0) (<= 0 ~processed~0) (<= 0 ~c2_st~0) (not (= |ULTIMATE.start_eval_~tmp~0#1| 0)) (= ~wl_st~0 1) (= ~e_g~0 2) (<= 1 ~c2_i~0) (= ~e_c~0 2) (= ~t_b~0 |ULTIMATE.start_write_loop_~t~0#1|) (= ~e_f~0 2) (<= 0 ~c_req_up~0) (<= 0 ~wb_st~0) (= ~p_out~0 0) (<= 0 ~c1_st~0) (= |#NULL.offset| 0) (= 2 ~wl_pc~0) (<= ~c2_i~0 1) (not (= ~d~0 (+ 2 |ULTIMATE.start_write_loop_~t~0#1|))) (= ~wb_i~0 1) (= ~e_p_in~0 0) (<= ~r_st~0 2) (<= 0 |#StackHeapBarrier|) (= ~e_e~0 2) (= |#NULL.base| 0))' at error location [2022-11-25 22:16:17,153 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:16:17,153 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:16:17,153 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 13] total 25 [2022-11-25 22:16:17,153 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155447972] [2022-11-25 22:16:17,154 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:16:17,154 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-25 22:16:17,154 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:16:17,155 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-25 22:16:17,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=315, Invalid=2547, Unknown=0, NotChecked=0, Total=2862 [2022-11-25 22:16:17,157 INFO L87 Difference]: Start difference. First operand 174 states and 262 transitions. Second operand has 26 states, 26 states have (on average 4.653846153846154) internal successors, (121), 25 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:16:24,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:16:24,521 INFO L93 Difference]: Finished difference Result 1612 states and 2338 transitions. [2022-11-25 22:16:24,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2022-11-25 22:16:24,525 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 4.653846153846154) internal successors, (121), 25 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2022-11-25 22:16:24,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:16:24,531 INFO L225 Difference]: With dead ends: 1612 [2022-11-25 22:16:24,531 INFO L226 Difference]: Without dead ends: 1431 [2022-11-25 22:16:24,539 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8518 ImplicationChecksByTransitivity, 24.5s TimeCoverageRelationStatistics Valid=2917, Invalid=19135, Unknown=0, NotChecked=0, Total=22052 [2022-11-25 22:16:24,540 INFO L413 NwaCegarLoop]: 135 mSDtfsCounter, 2388 mSDsluCounter, 1682 mSDsCounter, 0 mSdLazyCounter, 1154 mSolverCounterSat, 365 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2388 SdHoareTripleChecker+Valid, 1817 SdHoareTripleChecker+Invalid, 1519 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 365 IncrementalHoareTripleChecker+Valid, 1154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-25 22:16:24,541 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2388 Valid, 1817 Invalid, 1519 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [365 Valid, 1154 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-25 22:16:24,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1431 states. [2022-11-25 22:16:24,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1431 to 464. [2022-11-25 22:16:24,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 463 states have (on average 1.5140388768898487) internal successors, (701), 463 states have internal predecessors, (701), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:16:24,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 701 transitions. [2022-11-25 22:16:24,587 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 701 transitions. Word has length 50 [2022-11-25 22:16:24,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:16:24,588 INFO L495 AbstractCegarLoop]: Abstraction has 464 states and 701 transitions. [2022-11-25 22:16:24,588 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 4.653846153846154) internal successors, (121), 25 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:16:24,588 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 701 transitions. [2022-11-25 22:16:24,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-25 22:16:24,589 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:16:24,590 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 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] [2022-11-25 22:16:24,597 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-25 22:16:24,793 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:16:24,794 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:16:24,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:16:24,794 INFO L85 PathProgramCache]: Analyzing trace with hash -526552961, now seen corresponding path program 1 times [2022-11-25 22:16:24,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:16:24,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1669672780] [2022-11-25 22:16:24,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:16:24,795 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:16:24,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:16:25,373 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 30 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 22:16:25,373 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:16:25,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1669672780] [2022-11-25 22:16:25,373 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1669672780] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:16:25,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1184530925] [2022-11-25 22:16:25,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:16:25,374 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:16:25,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:16:25,375 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:16:25,405 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-25 22:16:25,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:16:25,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-25 22:16:25,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:16:25,638 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 32 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 22:16:25,638 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:16:26,027 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 31 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-25 22:16:26,027 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1184530925] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:16:26,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1689545465] [2022-11-25 22:16:26,034 INFO L159 IcfgInterpreter]: Started Sifa with 31 locations of interest [2022-11-25 22:16:26,035 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:16:26,036 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:16:26,036 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:16:26,036 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:17:47,534 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:17:58,768 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6704#(and (<= 0 (+ |ULTIMATE.start_eval_~tmp~0#1| 2147483648)) (<= 0 ~wb_pc~0) (<= 0 ~t_b~0) (<= 0 ~data~0) (<= 0 |#NULL.base|) (<= 0 ~c1_pc~0) (<= ~wb_i~0 1) (<= 0 ~d~0) (<= 0 ~c_t~0) (<= ~p_out~0 0) (<= |ULTIMATE.start_eval_~tmp~0#1| 2147483647) (<= ~c1_i~0 1) (<= 1 ~wb_i~0) (<= 0 ~c2_pc~0) (<= 1 ~c1_i~0) (<= 0 ~e_p_in~0) (= |ULTIMATE.start_start_simulation_~kernel_st~0#1| 1) (<= 2 ~e_f~0) (<= ~t_b~0 0) (<= 0 ~c~0) (<= 1 ~wl_i~0) (<= 0 ~processed~0) (<= ~e_c~0 2) (<= 0 ~p_in~0) (<= |#NULL.offset| 0) (<= 0 ~c2_st~0) (not (= |ULTIMATE.start_eval_~tmp~0#1| 0)) (= ~wl_st~0 1) (<= 1 ~c2_i~0) (<= ~e_g~0 2) (<= 0 ~r_i~0) (= ~t_b~0 |ULTIMATE.start_write_loop_~t~0#1|) (<= 0 ~c_req_up~0) (<= |#NULL.base| 0) (<= 0 ~wb_st~0) (<= ~e_f~0 2) (<= ~d~0 0) (<= 0 ~c1_st~0) (<= 2 ~e_g~0) (<= 0 |#NULL.offset|) (<= 0 ~p_out~0) (= 2 ~wl_pc~0) (<= ~c2_i~0 1) (<= ~p_in~0 0) (<= ~r_st~0 2) (<= ~wl_i~0 1) (<= 0 |#StackHeapBarrier|) (= ~e_e~0 2) (<= ~e_p_in~0 0) (<= ~r_i~0 0))' at error location [2022-11-25 22:17:58,768 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:17:58,768 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:17:58,768 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 4, 9] total 18 [2022-11-25 22:17:58,768 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653966723] [2022-11-25 22:17:58,768 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:17:58,769 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-25 22:17:58,769 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:17:58,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-25 22:17:58,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=341, Invalid=1299, Unknown=0, NotChecked=0, Total=1640 [2022-11-25 22:17:58,771 INFO L87 Difference]: Start difference. First operand 464 states and 701 transitions. Second operand has 18 states, 18 states have (on average 8.38888888888889) internal successors, (151), 18 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:17:59,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:17:59,784 INFO L93 Difference]: Finished difference Result 1004 states and 1503 transitions. [2022-11-25 22:17:59,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-25 22:17:59,786 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 8.38888888888889) internal successors, (151), 18 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2022-11-25 22:17:59,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:17:59,796 INFO L225 Difference]: With dead ends: 1004 [2022-11-25 22:17:59,796 INFO L226 Difference]: Without dead ends: 481 [2022-11-25 22:17:59,797 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 152 SyntacticMatches, 2 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1282 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=640, Invalid=2666, Unknown=0, NotChecked=0, Total=3306 [2022-11-25 22:17:59,798 INFO L413 NwaCegarLoop]: 81 mSDtfsCounter, 697 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 381 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 697 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 526 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 381 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 22:17:59,798 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [697 Valid, 299 Invalid, 526 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 381 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 22:17:59,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 481 states. [2022-11-25 22:17:59,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 481 to 349. [2022-11-25 22:17:59,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 348 states have (on average 1.3563218390804597) internal successors, (472), 348 states have internal predecessors, (472), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:17:59,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 472 transitions. [2022-11-25 22:17:59,838 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 472 transitions. Word has length 58 [2022-11-25 22:17:59,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:17:59,838 INFO L495 AbstractCegarLoop]: Abstraction has 349 states and 472 transitions. [2022-11-25 22:17:59,838 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 8.38888888888889) internal successors, (151), 18 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:17:59,838 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 472 transitions. [2022-11-25 22:17:59,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-11-25 22:17:59,839 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:17:59,839 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 3, 3, 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] [2022-11-25 22:17:59,850 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-25 22:18:00,041 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:18:00,042 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:18:00,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:18:00,042 INFO L85 PathProgramCache]: Analyzing trace with hash 569342224, now seen corresponding path program 1 times [2022-11-25 22:18:00,042 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:18:00,042 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1826770320] [2022-11-25 22:18:00,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:18:00,043 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:18:00,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:18:02,796 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 21 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:18:02,796 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:18:02,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1826770320] [2022-11-25 22:18:02,797 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1826770320] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:18:02,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [956791527] [2022-11-25 22:18:02,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:18:02,797 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:18:02,797 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:18:02,798 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:18:02,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42c65436-72c1-4444-a955-4840a4066554/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-25 22:18:02,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:18:02,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-25 22:18:02,931 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:18:15,933 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 21 proven. 41 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-25 22:18:15,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:18:38,218 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 1 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:18:38,219 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [956791527] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:18:38,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [453963127] [2022-11-25 22:18:38,221 INFO L159 IcfgInterpreter]: Started Sifa with 34 locations of interest [2022-11-25 22:18:38,221 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:18:38,222 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:18:38,222 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:18:38,222 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs