./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-new/count_by_2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e7fbc69 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_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-new/count_by_2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW --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 86d4e5d9ff4808cbd51f54a8e918c7da7f8f3d0797ade1f0adcb3da91d131026 --- 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-4e7fbc6 [2022-11-23 14:37:31,725 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 14:37:31,728 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 14:37:31,771 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 14:37:31,771 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 14:37:31,775 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 14:37:31,778 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 14:37:31,782 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 14:37:31,786 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 14:37:31,789 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 14:37:31,790 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 14:37:31,791 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 14:37:31,791 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 14:37:31,792 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 14:37:31,794 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 14:37:31,795 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 14:37:31,796 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 14:37:31,797 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 14:37:31,801 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 14:37:31,809 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 14:37:31,812 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 14:37:31,821 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 14:37:31,824 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 14:37:31,825 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 14:37:31,837 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 14:37:31,838 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 14:37:31,838 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 14:37:31,840 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 14:37:31,841 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 14:37:31,842 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 14:37:31,842 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 14:37:31,843 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 14:37:31,845 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 14:37:31,847 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 14:37:31,848 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 14:37:31,848 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 14:37:31,849 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 14:37:31,850 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 14:37:31,850 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 14:37:31,852 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 14:37:31,853 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 14:37:31,854 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-23 14:37:31,895 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 14:37:31,896 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 14:37:31,897 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 14:37:31,897 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 14:37:31,898 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 14:37:31,899 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 14:37:31,899 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 14:37:31,899 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 14:37:31,899 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 14:37:31,900 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 14:37:31,901 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 14:37:31,901 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 14:37:31,902 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 14:37:31,902 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 14:37:31,902 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 14:37:31,903 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 14:37:31,903 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 14:37:31,903 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 14:37:31,904 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 14:37:31,905 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-23 14:37:31,905 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 14:37:31,905 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-23 14:37:31,906 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 14:37:31,906 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-23 14:37:31,906 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 14:37:31,907 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-23 14:37:31,907 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-23 14:37:31,907 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-23 14:37:31,908 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 14:37:31,908 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-23 14:37:31,908 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 14:37:31,909 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 14:37:31,909 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:37:31,910 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 14:37:31,910 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 14:37:31,910 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 14:37:31,910 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-23 14:37:31,911 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 14:37:31,911 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 14:37:31,911 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-23 14:37:31,912 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 14:37:31,912 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_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 86d4e5d9ff4808cbd51f54a8e918c7da7f8f3d0797ade1f0adcb3da91d131026 [2022-11-23 14:37:32,237 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 14:37:32,275 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 14:37:32,277 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 14:37:32,279 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 14:37:32,279 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 14:37:32,281 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/loop-new/count_by_2.i [2022-11-23 14:37:35,438 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 14:37:35,674 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 14:37:35,675 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/sv-benchmarks/c/loop-new/count_by_2.i [2022-11-23 14:37:35,681 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/data/8078d3a39/a6be8830d19c4fa3a197857ddff9bfa1/FLAGceb529340 [2022-11-23 14:37:35,696 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/data/8078d3a39/a6be8830d19c4fa3a197857ddff9bfa1 [2022-11-23 14:37:35,699 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 14:37:35,701 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 14:37:35,702 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 14:37:35,703 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 14:37:35,717 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 14:37:35,718 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:37:35" (1/1) ... [2022-11-23 14:37:35,719 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@228511f2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:37:35, skipping insertion in model container [2022-11-23 14:37:35,720 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:37:35" (1/1) ... [2022-11-23 14:37:35,729 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 14:37:35,752 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 14:37:35,950 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_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/sv-benchmarks/c/loop-new/count_by_2.i[891,904] [2022-11-23 14:37:35,963 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:37:35,982 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 14:37:35,998 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_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/sv-benchmarks/c/loop-new/count_by_2.i[891,904] [2022-11-23 14:37:36,002 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:37:36,019 INFO L208 MainTranslator]: Completed translation [2022-11-23 14:37:36,019 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:37:36 WrapperNode [2022-11-23 14:37:36,020 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 14:37:36,021 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 14:37:36,022 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 14:37:36,022 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 14:37:36,031 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:37:36" (1/1) ... [2022-11-23 14:37:36,040 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:37:36" (1/1) ... [2022-11-23 14:37:36,062 INFO L138 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 25 [2022-11-23 14:37:36,062 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 14:37:36,064 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 14:37:36,065 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 14:37:36,065 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 14:37:36,075 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:37:36" (1/1) ... [2022-11-23 14:37:36,076 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:37:36" (1/1) ... [2022-11-23 14:37:36,079 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:37:36" (1/1) ... [2022-11-23 14:37:36,079 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:37:36" (1/1) ... [2022-11-23 14:37:36,082 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:37:36" (1/1) ... [2022-11-23 14:37:36,085 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:37:36" (1/1) ... [2022-11-23 14:37:36,086 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:37:36" (1/1) ... [2022-11-23 14:37:36,087 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:37:36" (1/1) ... [2022-11-23 14:37:36,088 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 14:37:36,089 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 14:37:36,089 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 14:37:36,089 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 14:37:36,090 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:37:36" (1/1) ... [2022-11-23 14:37:36,099 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:37:36,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:37:36,129 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 14:37:36,141 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 14:37:36,182 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-23 14:37:36,182 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-23 14:37:36,183 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 14:37:36,183 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 14:37:36,259 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 14:37:36,261 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 14:37:36,349 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 14:37:36,376 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 14:37:36,377 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-11-23 14:37:36,380 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:37:36 BoogieIcfgContainer [2022-11-23 14:37:36,380 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 14:37:36,383 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 14:37:36,384 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 14:37:36,388 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 14:37:36,388 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:37:35" (1/3) ... [2022-11-23 14:37:36,389 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2e0be6b1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:37:36, skipping insertion in model container [2022-11-23 14:37:36,390 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:37:36" (2/3) ... [2022-11-23 14:37:36,390 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2e0be6b1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:37:36, skipping insertion in model container [2022-11-23 14:37:36,390 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:37:36" (3/3) ... [2022-11-23 14:37:36,392 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_2.i [2022-11-23 14:37:36,417 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 14:37:36,418 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-23 14:37:36,475 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 14:37:36,482 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;@57e601b7, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 14:37:36,483 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-23 14:37:36,487 INFO L276 IsEmpty]: Start isEmpty. Operand has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:37:36,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-23 14:37:36,494 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:37:36,495 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-23 14:37:36,495 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:37:36,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:37:36,502 INFO L85 PathProgramCache]: Analyzing trace with hash 1941830, now seen corresponding path program 1 times [2022-11-23 14:37:36,537 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:37:36,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2136842158] [2022-11-23 14:37:36,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:37:36,538 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:37:36,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:37:36,727 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:37:36,728 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:37:36,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2136842158] [2022-11-23 14:37:36,729 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2136842158] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:37:36,729 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:37:36,729 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-23 14:37:36,731 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647896731] [2022-11-23 14:37:36,732 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:37:36,737 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 14:37:36,738 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:37:36,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 14:37:36,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 14:37:36,788 INFO L87 Difference]: Start difference. First operand has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 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) [2022-11-23 14:37:36,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:37:36,816 INFO L93 Difference]: Finished difference Result 13 states and 15 transitions. [2022-11-23 14:37:36,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 14:37:36,819 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 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 4 [2022-11-23 14:37:36,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:37:36,827 INFO L225 Difference]: With dead ends: 13 [2022-11-23 14:37:36,827 INFO L226 Difference]: Without dead ends: 6 [2022-11-23 14:37:36,830 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 [2022-11-23 14:37:36,834 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:37:36,835 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 6 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:37:36,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2022-11-23 14:37:36,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2022-11-23 14:37:36,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:37:36,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2022-11-23 14:37:36,880 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2022-11-23 14:37:36,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:37:36,881 INFO L495 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2022-11-23 14:37:36,881 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 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) [2022-11-23 14:37:36,881 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2022-11-23 14:37:36,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-23 14:37:36,882 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:37:36,882 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-11-23 14:37:36,882 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-23 14:37:36,882 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:37:36,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:37:36,883 INFO L85 PathProgramCache]: Analyzing trace with hash 60064071, now seen corresponding path program 1 times [2022-11-23 14:37:36,884 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:37:36,884 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1428383805] [2022-11-23 14:37:36,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:37:36,884 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:37:36,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:37:37,017 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:37:37,018 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:37:37,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1428383805] [2022-11-23 14:37:37,018 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1428383805] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:37:37,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2145415354] [2022-11-23 14:37:37,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:37:37,019 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:37:37,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:37:37,026 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:37:37,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 14:37:37,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:37:37,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-23 14:37:37,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:37:37,142 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:37:37,142 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:37:37,166 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:37:37,167 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2145415354] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:37:37,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1633148004] [2022-11-23 14:37:37,188 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-11-23 14:37:37,189 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:37:37,193 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:37:37,199 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:37:37,200 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:37:37,415 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:37:37,518 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '69#(and (<= 1000000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= 1000000 |ULTIMATE.start_main_~i~0#1|) 1 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:37:37,519 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:37:37,520 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:37:37,523 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2022-11-23 14:37:37,525 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874783264] [2022-11-23 14:37:37,525 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:37:37,526 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-23 14:37:37,527 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:37:37,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-23 14:37:37,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-11-23 14:37:37,531 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 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) [2022-11-23 14:37:37,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:37:37,566 INFO L93 Difference]: Finished difference Result 12 states and 14 transitions. [2022-11-23 14:37:37,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:37:37,567 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 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 5 [2022-11-23 14:37:37,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:37:37,568 INFO L225 Difference]: With dead ends: 12 [2022-11-23 14:37:37,568 INFO L226 Difference]: Without dead ends: 9 [2022-11-23 14:37:37,569 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-11-23 14:37:37,573 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:37:37,575 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:37:37,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2022-11-23 14:37:37,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2022-11-23 14:37:37,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:37:37,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2022-11-23 14:37:37,583 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 5 [2022-11-23 14:37:37,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:37:37,583 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2022-11-23 14:37:37,583 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 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) [2022-11-23 14:37:37,584 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2022-11-23 14:37:37,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-23 14:37:37,584 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:37:37,585 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1] [2022-11-23 14:37:37,596 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-23 14:37:37,790 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2022-11-23 14:37:37,791 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:37:37,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:37:37,791 INFO L85 PathProgramCache]: Analyzing trace with hash -1764353658, now seen corresponding path program 2 times [2022-11-23 14:37:37,792 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:37:37,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1116253664] [2022-11-23 14:37:37,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:37:37,792 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:37:37,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:37:37,958 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:37:37,958 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:37:37,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1116253664] [2022-11-23 14:37:37,959 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1116253664] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:37:37,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1595205199] [2022-11-23 14:37:37,959 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:37:37,960 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:37:37,960 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:37:37,961 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:37:37,984 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 14:37:38,024 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-23 14:37:38,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:37:38,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-23 14:37:38,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:37:38,068 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:37:38,068 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:37:38,161 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:37:38,161 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1595205199] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:37:38,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [131694437] [2022-11-23 14:37:38,171 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-11-23 14:37:38,172 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:37:38,172 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:37:38,173 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:37:38,173 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:37:38,292 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:37:38,390 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '158#(and (<= 1000000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= 1000000 |ULTIMATE.start_main_~i~0#1|) 1 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:37:38,390 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:37:38,390 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:37:38,391 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2022-11-23 14:37:38,391 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [578827845] [2022-11-23 14:37:38,391 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:37:38,392 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-23 14:37:38,392 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:37:38,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-23 14:37:38,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=153, Unknown=0, NotChecked=0, Total=240 [2022-11-23 14:37:38,393 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:37:38,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:37:38,418 INFO L93 Difference]: Finished difference Result 18 states and 23 transitions. [2022-11-23 14:37:38,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-23 14:37:38,419 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-23 14:37:38,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:37:38,420 INFO L225 Difference]: With dead ends: 18 [2022-11-23 14:37:38,420 INFO L226 Difference]: Without dead ends: 15 [2022-11-23 14:37:38,421 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=87, Invalid=153, Unknown=0, NotChecked=0, Total=240 [2022-11-23 14:37:38,422 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:37:38,430 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:37:38,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-23 14:37:38,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-11-23 14:37:38,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:37:38,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2022-11-23 14:37:38,435 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 8 [2022-11-23 14:37:38,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:37:38,436 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2022-11-23 14:37:38,436 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:37:38,436 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2022-11-23 14:37:38,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-23 14:37:38,448 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:37:38,449 INFO L195 NwaCegarLoop]: trace histogram [10, 1, 1, 1, 1] [2022-11-23 14:37:38,459 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-23 14:37:38,649 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:37:38,650 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:37:38,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:37:38,650 INFO L85 PathProgramCache]: Analyzing trace with hash 193090022, now seen corresponding path program 3 times [2022-11-23 14:37:38,650 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:37:38,651 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [814330525] [2022-11-23 14:37:38,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:37:38,651 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:37:38,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:37:38,854 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:37:38,855 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:37:38,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [814330525] [2022-11-23 14:37:38,855 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [814330525] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:37:38,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2137968059] [2022-11-23 14:37:38,855 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:37:38,856 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:37:38,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:37:38,857 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:37:38,887 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 14:37:38,911 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:37:38,911 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:37:38,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-23 14:37:38,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:37:38,963 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:37:38,963 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:37:39,240 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:37:39,241 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2137968059] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:37:39,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1734185822] [2022-11-23 14:37:39,244 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-11-23 14:37:39,246 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:37:39,246 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:37:39,246 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:37:39,247 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:37:39,291 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:37:39,382 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '319#(and (<= 1000000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= 1000000 |ULTIMATE.start_main_~i~0#1|) 1 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:37:39,382 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:37:39,382 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:37:39,382 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2022-11-23 14:37:39,383 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424865355] [2022-11-23 14:37:39,383 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:37:39,383 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-23 14:37:39,383 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:37:39,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-23 14:37:39,385 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=447, Unknown=0, NotChecked=0, Total=756 [2022-11-23 14:37:39,385 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 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) [2022-11-23 14:37:39,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:37:39,428 INFO L93 Difference]: Finished difference Result 30 states and 41 transitions. [2022-11-23 14:37:39,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-23 14:37:39,429 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 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 [2022-11-23 14:37:39,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:37:39,430 INFO L225 Difference]: With dead ends: 30 [2022-11-23 14:37:39,430 INFO L226 Difference]: Without dead ends: 27 [2022-11-23 14:37:39,431 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=309, Invalid=447, Unknown=0, NotChecked=0, Total=756 [2022-11-23 14:37:39,432 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:37:39,432 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 4 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:37:39,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-11-23 14:37:39,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-11-23 14:37:39,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 states have internal predecessors, (27), 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) [2022-11-23 14:37:39,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2022-11-23 14:37:39,438 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 14 [2022-11-23 14:37:39,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:37:39,438 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2022-11-23 14:37:39,438 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 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) [2022-11-23 14:37:39,439 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2022-11-23 14:37:39,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-23 14:37:39,439 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:37:39,440 INFO L195 NwaCegarLoop]: trace histogram [22, 1, 1, 1, 1] [2022-11-23 14:37:39,451 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-23 14:37:39,645 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:37:39,645 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:37:39,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:37:39,646 INFO L85 PathProgramCache]: Analyzing trace with hash 1874160294, now seen corresponding path program 4 times [2022-11-23 14:37:39,646 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:37:39,646 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [28215562] [2022-11-23 14:37:39,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:37:39,646 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:37:39,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:37:40,262 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:37:40,262 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:37:40,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [28215562] [2022-11-23 14:37:40,263 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [28215562] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:37:40,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1458880413] [2022-11-23 14:37:40,263 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 14:37:40,263 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:37:40,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:37:40,264 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:37:40,295 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 14:37:40,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:37:40,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-23 14:37:40,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:37:40,409 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:37:40,409 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:37:41,377 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:37:41,377 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1458880413] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:37:41,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [20068128] [2022-11-23 14:37:41,380 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-11-23 14:37:41,380 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:37:41,380 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:37:41,381 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:37:41,381 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:37:41,439 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:37:41,548 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '624#(and (<= 1000000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= 1000000 |ULTIMATE.start_main_~i~0#1|) 1 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:37:41,548 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:37:41,549 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:37:41,549 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2022-11-23 14:37:41,549 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1774783367] [2022-11-23 14:37:41,549 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:37:41,549 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-11-23 14:37:41,550 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:37:41,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-11-23 14:37:41,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1185, Invalid=1467, Unknown=0, NotChecked=0, Total=2652 [2022-11-23 14:37:41,552 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 states have internal predecessors, (52), 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) [2022-11-23 14:37:41,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:37:41,659 INFO L93 Difference]: Finished difference Result 54 states and 77 transitions. [2022-11-23 14:37:41,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-11-23 14:37:41,659 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 states have internal predecessors, (52), 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 26 [2022-11-23 14:37:41,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:37:41,662 INFO L225 Difference]: With dead ends: 54 [2022-11-23 14:37:41,662 INFO L226 Difference]: Without dead ends: 51 [2022-11-23 14:37:41,664 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 295 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1185, Invalid=1467, Unknown=0, NotChecked=0, Total=2652 [2022-11-23 14:37:41,666 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:37:41,666 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:37:41,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-11-23 14:37:41,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-11-23 14:37:41,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.02) internal successors, (51), 50 states have internal predecessors, (51), 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) [2022-11-23 14:37:41,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2022-11-23 14:37:41,682 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 26 [2022-11-23 14:37:41,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:37:41,682 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2022-11-23 14:37:41,685 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 states have internal predecessors, (52), 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) [2022-11-23 14:37:41,685 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2022-11-23 14:37:41,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-23 14:37:41,687 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:37:41,688 INFO L195 NwaCegarLoop]: trace histogram [46, 1, 1, 1, 1] [2022-11-23 14:37:41,698 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-23 14:37:41,893 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:37:41,893 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:37:41,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:37:41,894 INFO L85 PathProgramCache]: Analyzing trace with hash -1326564314, now seen corresponding path program 5 times [2022-11-23 14:37:41,894 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:37:41,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657193387] [2022-11-23 14:37:41,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:37:41,894 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:37:41,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:37:43,729 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:37:43,730 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:37:43,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657193387] [2022-11-23 14:37:43,730 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [657193387] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:37:43,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1269415087] [2022-11-23 14:37:43,730 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:37:43,730 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:37:43,731 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:37:43,735 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:37:43,750 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 14:37:43,815 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2022-11-23 14:37:43,815 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:37:43,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-23 14:37:43,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:37:43,960 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:37:43,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:37:47,119 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:37:47,119 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1269415087] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:37:47,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2019742141] [2022-11-23 14:37:47,121 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-11-23 14:37:47,121 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:37:47,122 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:37:47,122 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:37:47,122 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:37:47,178 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:37:47,327 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1217#(and (<= 1000000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= 1000000 |ULTIMATE.start_main_~i~0#1|) 1 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:37:47,327 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:37:47,327 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:37:47,327 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 96 [2022-11-23 14:37:47,327 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1902027112] [2022-11-23 14:37:47,328 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:37:47,328 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2022-11-23 14:37:47,328 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:37:47,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2022-11-23 14:37:47,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4665, Invalid=5235, Unknown=0, NotChecked=0, Total=9900 [2022-11-23 14:37:47,334 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand has 97 states, 97 states have (on average 1.0309278350515463) internal successors, (100), 96 states have internal predecessors, (100), 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) [2022-11-23 14:37:47,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:37:47,626 INFO L93 Difference]: Finished difference Result 102 states and 149 transitions. [2022-11-23 14:37:47,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2022-11-23 14:37:47,628 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 1.0309278350515463) internal successors, (100), 96 states have internal predecessors, (100), 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 [2022-11-23 14:37:47,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:37:47,635 INFO L225 Difference]: With dead ends: 102 [2022-11-23 14:37:47,635 INFO L226 Difference]: Without dead ends: 99 [2022-11-23 14:37:47,639 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 607 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=4665, Invalid=5235, Unknown=0, NotChecked=0, Total=9900 [2022-11-23 14:37:47,641 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:37:47,642 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:37:47,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-11-23 14:37:47,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2022-11-23 14:37:47,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.010204081632653) internal successors, (99), 98 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) [2022-11-23 14:37:47,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2022-11-23 14:37:47,667 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 50 [2022-11-23 14:37:47,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:37:47,667 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2022-11-23 14:37:47,668 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 1.0309278350515463) internal successors, (100), 96 states have internal predecessors, (100), 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) [2022-11-23 14:37:47,668 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2022-11-23 14:37:47,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-11-23 14:37:47,673 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:37:47,673 INFO L195 NwaCegarLoop]: trace histogram [94, 1, 1, 1, 1] [2022-11-23 14:37:47,687 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-23 14:37:47,880 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:37:47,880 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:37:47,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:37:47,881 INFO L85 PathProgramCache]: Analyzing trace with hash 1575640870, now seen corresponding path program 6 times [2022-11-23 14:37:47,881 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:37:47,881 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [640667513] [2022-11-23 14:37:47,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:37:47,881 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:37:47,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:37:53,267 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:37:53,267 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:37:53,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [640667513] [2022-11-23 14:37:53,268 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [640667513] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:37:53,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1892370198] [2022-11-23 14:37:53,268 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:37:53,269 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:37:53,269 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:37:53,272 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:37:53,274 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-23 14:37:53,351 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:37:53,351 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:37:53,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 96 conjunts are in the unsatisfiable core [2022-11-23 14:37:53,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:37:53,625 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:37:53,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:38:04,767 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:38:04,768 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1892370198] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:38:04,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [389119514] [2022-11-23 14:38:04,769 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-11-23 14:38:04,770 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:38:04,770 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:38:04,770 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:38:04,770 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:38:04,836 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:38:05,083 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2386#(and (<= 1000000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= 1000000 |ULTIMATE.start_main_~i~0#1|) 1 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:38:05,083 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:38:05,083 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:38:05,083 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96, 96] total 192 [2022-11-23 14:38:05,083 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192995001] [2022-11-23 14:38:05,084 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:38:05,085 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 193 states [2022-11-23 14:38:05,085 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:38:05,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 193 interpolants. [2022-11-23 14:38:05,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18537, Invalid=19683, Unknown=0, NotChecked=0, Total=38220 [2022-11-23 14:38:05,107 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand has 193 states, 193 states have (on average 1.0155440414507773) internal successors, (196), 192 states have internal predecessors, (196), 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) [2022-11-23 14:38:05,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:38:05,787 INFO L93 Difference]: Finished difference Result 198 states and 293 transitions. [2022-11-23 14:38:05,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 192 states. [2022-11-23 14:38:05,788 INFO L78 Accepts]: Start accepts. Automaton has has 193 states, 193 states have (on average 1.0155440414507773) internal successors, (196), 192 states have internal predecessors, (196), 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 98 [2022-11-23 14:38:05,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:38:05,795 INFO L225 Difference]: With dead ends: 198 [2022-11-23 14:38:05,795 INFO L226 Difference]: Without dead ends: 195 [2022-11-23 14:38:05,801 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 194 SyntacticMatches, 0 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1231 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=18537, Invalid=19683, Unknown=0, NotChecked=0, Total=38220 [2022-11-23 14:38:05,805 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 300 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:38:05,805 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 300 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 14:38:05,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2022-11-23 14:38:05,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 195. [2022-11-23 14:38:05,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 194 states have (on average 1.0051546391752577) internal successors, (195), 194 states have internal predecessors, (195), 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) [2022-11-23 14:38:05,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 195 transitions. [2022-11-23 14:38:05,832 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 195 transitions. Word has length 98 [2022-11-23 14:38:05,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:38:05,835 INFO L495 AbstractCegarLoop]: Abstraction has 195 states and 195 transitions. [2022-11-23 14:38:05,836 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 193 states, 193 states have (on average 1.0155440414507773) internal successors, (196), 192 states have internal predecessors, (196), 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) [2022-11-23 14:38:05,836 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 195 transitions. [2022-11-23 14:38:05,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2022-11-23 14:38:05,842 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:38:05,842 INFO L195 NwaCegarLoop]: trace histogram [190, 1, 1, 1, 1] [2022-11-23 14:38:05,859 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-23 14:38:06,055 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-23 14:38:06,056 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:38:06,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:38:06,056 INFO L85 PathProgramCache]: Analyzing trace with hash 1544332582, now seen corresponding path program 7 times [2022-11-23 14:38:06,057 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:38:06,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [330564957] [2022-11-23 14:38:06,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:38:06,057 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:38:06,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:38:27,165 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:38:27,165 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:38:27,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [330564957] [2022-11-23 14:38:27,165 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [330564957] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:38:27,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1932953690] [2022-11-23 14:38:27,165 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 14:38:27,166 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:38:27,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:38:27,167 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:38:27,169 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-23 14:38:27,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:38:27,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 601 conjuncts, 192 conjunts are in the unsatisfiable core [2022-11-23 14:38:27,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:38:27,826 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:38:27,826 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:39:14,851 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:39:14,852 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1932953690] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:39:14,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [355893202] [2022-11-23 14:39:14,854 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-11-23 14:39:14,854 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:39:14,854 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:39:14,855 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:39:14,855 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:39:14,897 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:39:15,303 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4707#(and (<= 1000000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= 1000000 |ULTIMATE.start_main_~i~0#1|) 1 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:39:15,303 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:39:15,303 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:39:15,304 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [192, 192, 192] total 384 [2022-11-23 14:39:15,304 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644872918] [2022-11-23 14:39:15,304 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:39:15,305 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 385 states [2022-11-23 14:39:15,305 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:39:15,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 385 interpolants. [2022-11-23 14:39:15,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73929, Invalid=76227, Unknown=0, NotChecked=0, Total=150156 [2022-11-23 14:39:15,338 INFO L87 Difference]: Start difference. First operand 195 states and 195 transitions. Second operand has 385 states, 385 states have (on average 1.0077922077922077) internal successors, (388), 384 states have internal predecessors, (388), 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) [2022-11-23 14:39:17,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:39:17,550 INFO L93 Difference]: Finished difference Result 390 states and 581 transitions. [2022-11-23 14:39:17,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 384 states. [2022-11-23 14:39:17,551 INFO L78 Accepts]: Start accepts. Automaton has has 385 states, 385 states have (on average 1.0077922077922077) internal successors, (388), 384 states have internal predecessors, (388), 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 194 [2022-11-23 14:39:17,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:39:17,553 INFO L225 Difference]: With dead ends: 390 [2022-11-23 14:39:17,554 INFO L226 Difference]: Without dead ends: 387 [2022-11-23 14:39:17,561 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 772 GetRequests, 386 SyntacticMatches, 0 SemanticMatches, 386 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2479 ImplicationChecksByTransitivity, 62.8s TimeCoverageRelationStatistics Valid=73929, Invalid=76227, Unknown=0, NotChecked=0, Total=150156 [2022-11-23 14:39:17,561 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 393 mSolverCounterSat, 200 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 593 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 200 IncrementalHoareTripleChecker+Valid, 393 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 14:39:17,562 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 593 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [200 Valid, 393 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 14:39:17,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2022-11-23 14:39:17,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 387. [2022-11-23 14:39:17,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 387 states, 386 states have (on average 1.0025906735751295) internal successors, (387), 386 states have internal predecessors, (387), 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) [2022-11-23 14:39:17,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 387 transitions. [2022-11-23 14:39:17,589 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 387 transitions. Word has length 194 [2022-11-23 14:39:17,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:39:17,590 INFO L495 AbstractCegarLoop]: Abstraction has 387 states and 387 transitions. [2022-11-23 14:39:17,591 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 385 states, 385 states have (on average 1.0077922077922077) internal successors, (388), 384 states have internal predecessors, (388), 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) [2022-11-23 14:39:17,591 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 387 transitions. [2022-11-23 14:39:17,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 387 [2022-11-23 14:39:17,599 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:39:17,599 INFO L195 NwaCegarLoop]: trace histogram [382, 1, 1, 1, 1] [2022-11-23 14:39:17,605 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-23 14:39:17,805 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-23 14:39:17,805 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:39:17,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:39:17,806 INFO L85 PathProgramCache]: Analyzing trace with hash -1191628506, now seen corresponding path program 8 times [2022-11-23 14:39:17,806 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:39:17,806 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1247758714] [2022-11-23 14:39:17,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:39:17,806 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:39:18,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:40:40,742 INFO L134 CoverageAnalysis]: Checked inductivity of 73153 backedges. 0 proven. 73153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:40:40,742 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:40:40,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1247758714] [2022-11-23 14:40:40,743 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1247758714] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:40:40,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1873498512] [2022-11-23 14:40:40,743 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:40:40,743 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:40:40,744 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:40:40,751 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:40:40,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-23 14:40:41,850 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 192 check-sat command(s) [2022-11-23 14:40:41,851 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:40:41,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 1177 conjuncts, 384 conjunts are in the unsatisfiable core [2022-11-23 14:40:41,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:40:42,818 INFO L134 CoverageAnalysis]: Checked inductivity of 73153 backedges. 0 proven. 73153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:40:42,819 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:43:49,127 INFO L134 CoverageAnalysis]: Checked inductivity of 73153 backedges. 0 proven. 73153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:43:49,127 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1873498512] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:43:49,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [866144019] [2022-11-23 14:43:49,129 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-11-23 14:43:49,129 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:43:49,129 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:43:49,129 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:43:49,129 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:43:49,161 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:43:49,928 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9332#(and (<= 1000000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= 1000000 |ULTIMATE.start_main_~i~0#1|) 1 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:43:49,929 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:43:49,929 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:43:49,929 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [384, 384, 384] total 768 [2022-11-23 14:43:49,929 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572273486] [2022-11-23 14:43:49,929 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:43:49,931 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 769 states [2022-11-23 14:43:49,931 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:43:49,968 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 769 interpolants. [2022-11-23 14:43:49,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=295305, Invalid=299907, Unknown=0, NotChecked=0, Total=595212 [2022-11-23 14:43:49,995 INFO L87 Difference]: Start difference. First operand 387 states and 387 transitions. Second operand has 769 states, 769 states have (on average 1.0039011703511054) internal successors, (772), 768 states have internal predecessors, (772), 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) [2022-11-23 14:44:04,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:44:04,929 INFO L93 Difference]: Finished difference Result 774 states and 1157 transitions. [2022-11-23 14:44:04,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 768 states. [2022-11-23 14:44:04,930 INFO L78 Accepts]: Start accepts. Automaton has has 769 states, 769 states have (on average 1.0039011703511054) internal successors, (772), 768 states have internal predecessors, (772), 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 386 [2022-11-23 14:44:04,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:44:04,935 INFO L225 Difference]: With dead ends: 774 [2022-11-23 14:44:04,935 INFO L226 Difference]: Without dead ends: 771 [2022-11-23 14:44:04,962 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1540 GetRequests, 770 SyntacticMatches, 0 SemanticMatches, 770 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4975 ImplicationChecksByTransitivity, 248.8s TimeCoverageRelationStatistics Valid=295305, Invalid=299907, Unknown=0, NotChecked=0, Total=595212 [2022-11-23 14:44:04,963 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 779 mSolverCounterSat, 386 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 1165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 386 IncrementalHoareTripleChecker+Valid, 779 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-23 14:44:04,963 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 22 Invalid, 1165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [386 Valid, 779 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-23 14:44:04,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 771 states. [2022-11-23 14:44:04,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 771 to 771. [2022-11-23 14:44:04,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 771 states, 770 states have (on average 1.0012987012987014) internal successors, (771), 770 states have internal predecessors, (771), 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) [2022-11-23 14:44:05,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 771 states to 771 states and 771 transitions. [2022-11-23 14:44:05,003 INFO L78 Accepts]: Start accepts. Automaton has 771 states and 771 transitions. Word has length 386 [2022-11-23 14:44:05,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:44:05,004 INFO L495 AbstractCegarLoop]: Abstraction has 771 states and 771 transitions. [2022-11-23 14:44:05,005 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 769 states, 769 states have (on average 1.0039011703511054) internal successors, (772), 768 states have internal predecessors, (772), 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) [2022-11-23 14:44:05,006 INFO L276 IsEmpty]: Start isEmpty. Operand 771 states and 771 transitions. [2022-11-23 14:44:05,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 771 [2022-11-23 14:44:05,031 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:44:05,031 INFO L195 NwaCegarLoop]: trace histogram [766, 1, 1, 1, 1] [2022-11-23 14:44:05,039 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-23 14:44:05,238 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:44:05,239 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 14:44:05,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:44:05,240 INFO L85 PathProgramCache]: Analyzing trace with hash 1970424102, now seen corresponding path program 9 times [2022-11-23 14:44:05,240 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:44:05,240 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [358784919] [2022-11-23 14:44:05,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:44:05,240 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:44:08,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:50:38,917 INFO L134 CoverageAnalysis]: Checked inductivity of 293761 backedges. 0 proven. 293761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:50:38,917 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:50:38,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [358784919] [2022-11-23 14:50:38,918 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [358784919] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:50:38,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [632520136] [2022-11-23 14:50:38,918 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 14:50:38,918 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:50:38,918 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:50:38,921 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:50:38,922 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3381251d-d7fb-4688-ac04-a09fa9cd7cd0/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-23 14:50:39,386 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 14:50:39,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:50:39,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 2329 conjuncts, 768 conjunts are in the unsatisfiable core [2022-11-23 14:50:39,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:50:41,040 INFO L134 CoverageAnalysis]: Checked inductivity of 293761 backedges. 0 proven. 293761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:50:41,040 INFO L328 TraceCheckSpWp]: Computing backward predicates...