./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-simple/nested_6.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 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_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-simple/nested_6.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh --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 e0e55420715ff80c27c9ff14eb8ac6a520210206e33b4fd081fea4bf1c2e05be --- 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-2329fc7 [2022-12-14 14:39:43,870 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 14:39:43,872 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 14:39:43,884 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 14:39:43,884 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 14:39:43,885 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 14:39:43,886 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 14:39:43,904 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 14:39:43,905 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 14:39:43,906 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 14:39:43,906 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 14:39:43,907 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 14:39:43,907 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 14:39:43,908 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 14:39:43,909 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 14:39:43,910 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 14:39:43,910 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 14:39:43,911 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 14:39:43,912 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 14:39:43,913 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 14:39:43,914 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 14:39:43,915 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 14:39:43,916 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 14:39:43,928 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 14:39:43,931 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 14:39:43,931 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 14:39:43,931 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 14:39:43,932 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 14:39:43,932 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 14:39:43,932 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 14:39:43,933 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 14:39:43,933 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 14:39:43,934 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 14:39:43,934 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 14:39:43,935 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 14:39:43,935 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 14:39:43,935 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 14:39:43,935 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 14:39:43,936 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 14:39:43,936 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 14:39:43,937 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 14:39:43,937 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 14:39:43,953 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 14:39:43,953 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 14:39:43,953 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 14:39:43,953 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 14:39:43,954 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 14:39:43,954 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 14:39:43,954 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 14:39:43,954 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 14:39:43,955 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 14:39:43,955 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 14:39:43,955 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 14:39:43,955 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 14:39:43,955 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 14:39:43,955 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 14:39:43,955 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 14:39:43,955 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 14:39:43,956 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 14:39:43,956 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 14:39:43,956 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 14:39:43,956 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 14:39:43,956 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 14:39:43,957 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 14:39:43,957 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 14:39:43,957 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 14:39:43,957 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 14:39:43,957 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 14:39:43,957 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 14:39:43,957 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 14:39:43,957 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 14:39:43,957 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 14:39:43,958 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 14:39:43,958 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 14:39:43,958 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 14:39:43,958 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 14:39:43,958 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 14:39:43,958 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 14:39:43,958 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 14:39:43,958 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 14:39:43,959 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 14:39:43,959 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 14:39:43,959 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 14:39:43,959 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_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e0e55420715ff80c27c9ff14eb8ac6a520210206e33b4fd081fea4bf1c2e05be [2022-12-14 14:39:44,123 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 14:39:44,144 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 14:39:44,147 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 14:39:44,148 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 14:39:44,148 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 14:39:44,149 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/loop-simple/nested_6.c [2022-12-14 14:39:46,729 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 14:39:46,848 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 14:39:46,849 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/sv-benchmarks/c/loop-simple/nested_6.c [2022-12-14 14:39:46,853 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/data/659cb8598/d5f139cd0a5d4498a40ef0021dd8cbb8/FLAGaacb5ec62 [2022-12-14 14:39:46,863 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/data/659cb8598/d5f139cd0a5d4498a40ef0021dd8cbb8 [2022-12-14 14:39:46,865 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 14:39:46,866 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 14:39:46,867 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 14:39:46,867 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 14:39:46,871 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 14:39:46,871 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 02:39:46" (1/1) ... [2022-12-14 14:39:46,872 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3967b0a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:39:46, skipping insertion in model container [2022-12-14 14:39:46,872 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 02:39:46" (1/1) ... [2022-12-14 14:39:46,878 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 14:39:46,888 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 14:39:47,026 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_735bc458-a04b-450c-93df-237bb040896f/sv-benchmarks/c/loop-simple/nested_6.c[959,972] [2022-12-14 14:39:47,032 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 14:39:47,041 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 14:39:47,056 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_735bc458-a04b-450c-93df-237bb040896f/sv-benchmarks/c/loop-simple/nested_6.c[959,972] [2022-12-14 14:39:47,057 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 14:39:47,067 INFO L208 MainTranslator]: Completed translation [2022-12-14 14:39:47,067 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:39:47 WrapperNode [2022-12-14 14:39:47,068 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 14:39:47,068 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 14:39:47,069 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 14:39:47,069 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 14:39:47,074 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:39:47" (1/1) ... [2022-12-14 14:39:47,079 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:39:47" (1/1) ... [2022-12-14 14:39:47,092 INFO L138 Inliner]: procedures = 10, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 68 [2022-12-14 14:39:47,092 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 14:39:47,093 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 14:39:47,093 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 14:39:47,093 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 14:39:47,101 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:39:47" (1/1) ... [2022-12-14 14:39:47,101 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:39:47" (1/1) ... [2022-12-14 14:39:47,102 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:39:47" (1/1) ... [2022-12-14 14:39:47,102 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:39:47" (1/1) ... [2022-12-14 14:39:47,104 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:39:47" (1/1) ... [2022-12-14 14:39:47,107 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:39:47" (1/1) ... [2022-12-14 14:39:47,108 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:39:47" (1/1) ... [2022-12-14 14:39:47,109 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:39:47" (1/1) ... [2022-12-14 14:39:47,110 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 14:39:47,111 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 14:39:47,111 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 14:39:47,111 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 14:39:47,112 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:39:47" (1/1) ... [2022-12-14 14:39:47,117 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 14:39:47,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:39:47,136 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 14:39:47,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 14:39:47,164 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 14:39:47,164 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 14:39:47,164 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 14:39:47,164 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 14:39:47,216 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 14:39:47,217 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 14:39:47,306 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 14:39:47,330 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 14:39:47,330 INFO L300 CfgBuilder]: Removed 6 assume(true) statements. [2022-12-14 14:39:47,332 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 02:39:47 BoogieIcfgContainer [2022-12-14 14:39:47,332 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 14:39:47,334 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 14:39:47,334 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 14:39:47,337 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 14:39:47,337 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 02:39:46" (1/3) ... [2022-12-14 14:39:47,338 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c979d10 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 02:39:47, skipping insertion in model container [2022-12-14 14:39:47,338 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:39:47" (2/3) ... [2022-12-14 14:39:47,338 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c979d10 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 02:39:47, skipping insertion in model container [2022-12-14 14:39:47,338 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 02:39:47" (3/3) ... [2022-12-14 14:39:47,339 INFO L112 eAbstractionObserver]: Analyzing ICFG nested_6.c [2022-12-14 14:39:47,354 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 14:39:47,354 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 14:39:47,389 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 14:39:47,394 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;@4714b4d1, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 14:39:47,395 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 14:39:47,398 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 10 states have (on average 1.8) internal successors, (18), 11 states have internal predecessors, (18), 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) [2022-12-14 14:39:47,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-12-14 14:39:47,402 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:39:47,403 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-12-14 14:39:47,403 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:39:47,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:39:47,407 INFO L85 PathProgramCache]: Analyzing trace with hash 3699464, now seen corresponding path program 1 times [2022-12-14 14:39:47,415 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:39:47,415 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [352367772] [2022-12-14 14:39:47,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:39:47,416 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:39:47,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:39:47,572 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:39:47,573 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:39:47,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [352367772] [2022-12-14 14:39:47,574 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [352367772] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:39:47,574 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:39:47,574 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 14:39:47,576 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707138048] [2022-12-14 14:39:47,577 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:39:47,581 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 14:39:47,581 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:39:47,612 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 14:39:47,613 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:39:47,614 INFO L87 Difference]: Start difference. First operand has 12 states, 10 states have (on average 1.8) internal successors, (18), 11 states have internal predecessors, (18), 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) [2022-12-14 14:39:47,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:39:47,661 INFO L93 Difference]: Finished difference Result 23 states and 35 transitions. [2022-12-14 14:39:47,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 14:39:47,664 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 [2022-12-14 14:39:47,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:39:47,670 INFO L225 Difference]: With dead ends: 23 [2022-12-14 14:39:47,671 INFO L226 Difference]: Without dead ends: 16 [2022-12-14 14:39:47,673 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:39:47,676 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 10 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:39:47,677 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 12 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:39:47,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-12-14 14:39:47,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 11. [2022-12-14 14:39:47,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.6) internal successors, (16), 10 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) [2022-12-14 14:39:47,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 16 transitions. [2022-12-14 14:39:47,706 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 16 transitions. Word has length 4 [2022-12-14 14:39:47,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:39:47,706 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 16 transitions. [2022-12-14 14:39:47,706 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) [2022-12-14 14:39:47,706 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 16 transitions. [2022-12-14 14:39:47,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-12-14 14:39:47,707 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:39:47,707 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-12-14 14:39:47,707 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 14:39:47,707 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:39:47,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:39:47,708 INFO L85 PathProgramCache]: Analyzing trace with hash -818530962, now seen corresponding path program 1 times [2022-12-14 14:39:47,708 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:39:47,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [271945239] [2022-12-14 14:39:47,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:39:47,709 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:39:47,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:39:47,761 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:39:47,762 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:39:47,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [271945239] [2022-12-14 14:39:47,762 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [271945239] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:39:47,762 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:39:47,762 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 14:39:47,763 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239050390] [2022-12-14 14:39:47,763 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:39:47,764 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 14:39:47,764 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:39:47,765 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 14:39:47,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:39:47,765 INFO L87 Difference]: Start difference. First operand 11 states and 16 transitions. Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:39:47,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:39:47,794 INFO L93 Difference]: Finished difference Result 25 states and 40 transitions. [2022-12-14 14:39:47,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 14:39:47,795 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-12-14 14:39:47,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:39:47,795 INFO L225 Difference]: With dead ends: 25 [2022-12-14 14:39:47,795 INFO L226 Difference]: Without dead ends: 16 [2022-12-14 14:39:47,796 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:39:47,797 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 8 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:39:47,797 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 10 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:39:47,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-12-14 14:39:47,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 12. [2022-12-14 14:39:47,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 11 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:39:47,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 17 transitions. [2022-12-14 14:39:47,801 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 17 transitions. Word has length 6 [2022-12-14 14:39:47,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:39:47,801 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 17 transitions. [2022-12-14 14:39:47,801 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:39:47,801 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 17 transitions. [2022-12-14 14:39:47,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-12-14 14:39:47,802 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:39:47,802 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:39:47,802 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 14:39:47,802 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:39:47,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:39:47,803 INFO L85 PathProgramCache]: Analyzing trace with hash 1316041273, now seen corresponding path program 1 times [2022-12-14 14:39:47,803 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:39:47,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1725839884] [2022-12-14 14:39:47,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:39:47,803 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:39:47,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:39:47,852 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:39:47,852 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:39:47,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1725839884] [2022-12-14 14:39:47,853 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1725839884] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:39:47,853 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:39:47,853 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 14:39:47,853 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855710432] [2022-12-14 14:39:47,853 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:39:47,854 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 14:39:47,854 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:39:47,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 14:39:47,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:39:47,855 INFO L87 Difference]: Start difference. First operand 12 states and 17 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:39:47,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:39:47,882 INFO L93 Difference]: Finished difference Result 26 states and 40 transitions. [2022-12-14 14:39:47,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 14:39:47,883 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 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 [2022-12-14 14:39:47,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:39:47,883 INFO L225 Difference]: With dead ends: 26 [2022-12-14 14:39:47,883 INFO L226 Difference]: Without dead ends: 16 [2022-12-14 14:39:47,884 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:39:47,885 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 6 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:39:47,886 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 10 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:39:47,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-12-14 14:39:47,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 13. [2022-12-14 14:39:47,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.5) internal successors, (18), 12 states have internal predecessors, (18), 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) [2022-12-14 14:39:47,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 18 transitions. [2022-12-14 14:39:47,890 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 18 transitions. Word has length 8 [2022-12-14 14:39:47,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:39:47,891 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 18 transitions. [2022-12-14 14:39:47,891 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:39:47,891 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 18 transitions. [2022-12-14 14:39:47,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-12-14 14:39:47,891 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:39:47,892 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:39:47,892 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-12-14 14:39:47,892 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:39:47,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:39:47,893 INFO L85 PathProgramCache]: Analyzing trace with hash -1577731475, now seen corresponding path program 1 times [2022-12-14 14:39:47,893 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:39:47,893 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1987004016] [2022-12-14 14:39:47,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:39:47,893 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:39:47,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:39:47,948 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:39:47,948 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:39:47,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1987004016] [2022-12-14 14:39:47,949 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1987004016] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:39:47,949 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:39:47,949 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 14:39:47,949 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2147042152] [2022-12-14 14:39:47,949 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:39:47,950 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 14:39:47,950 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:39:47,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 14:39:47,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:39:47,950 INFO L87 Difference]: Start difference. First operand 13 states and 18 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 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) [2022-12-14 14:39:47,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:39:47,970 INFO L93 Difference]: Finished difference Result 27 states and 40 transitions. [2022-12-14 14:39:47,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 14:39:47,970 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 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 10 [2022-12-14 14:39:47,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:39:47,971 INFO L225 Difference]: With dead ends: 27 [2022-12-14 14:39:47,971 INFO L226 Difference]: Without dead ends: 16 [2022-12-14 14:39:47,971 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:39:47,972 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 4 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:39:47,973 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 10 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:39:47,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-12-14 14:39:47,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 14. [2022-12-14 14:39:47,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 13 states have internal predecessors, (19), 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) [2022-12-14 14:39:47,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 19 transitions. [2022-12-14 14:39:47,976 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 19 transitions. Word has length 10 [2022-12-14 14:39:47,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:39:47,976 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 19 transitions. [2022-12-14 14:39:47,976 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 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) [2022-12-14 14:39:47,976 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 19 transitions. [2022-12-14 14:39:47,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-12-14 14:39:47,976 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:39:47,977 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:39:47,977 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-12-14 14:39:47,977 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:39:47,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:39:47,977 INFO L85 PathProgramCache]: Analyzing trace with hash -793308438, now seen corresponding path program 1 times [2022-12-14 14:39:47,977 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:39:47,978 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2110732930] [2022-12-14 14:39:47,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:39:47,978 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:39:47,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:39:48,020 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:39:48,021 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:39:48,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2110732930] [2022-12-14 14:39:48,021 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2110732930] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:39:48,021 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:39:48,022 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 14:39:48,022 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [102564147] [2022-12-14 14:39:48,022 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:39:48,022 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 14:39:48,022 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:39:48,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 14:39:48,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:39:48,024 INFO L87 Difference]: Start difference. First operand 14 states and 19 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 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) [2022-12-14 14:39:48,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:39:48,046 INFO L93 Difference]: Finished difference Result 28 states and 40 transitions. [2022-12-14 14:39:48,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 14:39:48,047 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 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 12 [2022-12-14 14:39:48,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:39:48,047 INFO L225 Difference]: With dead ends: 28 [2022-12-14 14:39:48,047 INFO L226 Difference]: Without dead ends: 16 [2022-12-14 14:39:48,047 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:39:48,048 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 2 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:39:48,049 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 10 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:39:48,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-12-14 14:39:48,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2022-12-14 14:39:48,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 14 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:39:48,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 20 transitions. [2022-12-14 14:39:48,052 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 20 transitions. Word has length 12 [2022-12-14 14:39:48,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:39:48,052 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 20 transitions. [2022-12-14 14:39:48,052 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 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) [2022-12-14 14:39:48,052 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 20 transitions. [2022-12-14 14:39:48,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 14:39:48,052 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:39:48,052 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:39:48,053 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-12-14 14:39:48,053 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:39:48,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:39:48,053 INFO L85 PathProgramCache]: Analyzing trace with hash -1700496206, now seen corresponding path program 1 times [2022-12-14 14:39:48,053 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:39:48,053 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [53873817] [2022-12-14 14:39:48,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:39:48,054 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:39:48,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:39:48,098 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:39:48,098 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:39:48,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [53873817] [2022-12-14 14:39:48,099 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [53873817] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:39:48,099 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:39:48,099 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 14:39:48,099 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426214923] [2022-12-14 14:39:48,099 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:39:48,100 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 14:39:48,100 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:39:48,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 14:39:48,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:39:48,101 INFO L87 Difference]: Start difference. First operand 15 states and 20 transitions. Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:39:48,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:39:48,120 INFO L93 Difference]: Finished difference Result 29 states and 40 transitions. [2022-12-14 14:39:48,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 14:39:48,121 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-12-14 14:39:48,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:39:48,121 INFO L225 Difference]: With dead ends: 29 [2022-12-14 14:39:48,121 INFO L226 Difference]: Without dead ends: 16 [2022-12-14 14:39:48,122 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:39:48,123 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:39:48,123 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 12 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:39:48,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-12-14 14:39:48,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-12-14 14:39:48,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.4) internal successors, (21), 15 states have internal predecessors, (21), 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) [2022-12-14 14:39:48,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 21 transitions. [2022-12-14 14:39:48,128 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 21 transitions. Word has length 14 [2022-12-14 14:39:48,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:39:48,128 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 21 transitions. [2022-12-14 14:39:48,128 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:39:48,129 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 21 transitions. [2022-12-14 14:39:48,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-12-14 14:39:48,129 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:39:48,129 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:39:48,129 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-12-14 14:39:48,130 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:39:48,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:39:48,130 INFO L85 PathProgramCache]: Analyzing trace with hash 1473652905, now seen corresponding path program 1 times [2022-12-14 14:39:48,131 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:39:48,131 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1350834337] [2022-12-14 14:39:48,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:39:48,131 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:39:48,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:39:48,178 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:39:48,178 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:39:48,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1350834337] [2022-12-14 14:39:48,178 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1350834337] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:39:48,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [869824279] [2022-12-14 14:39:48,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:39:48,179 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:39:48,179 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:39:48,180 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:39:48,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 14:39:48,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:39:48,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 3 conjunts are in the unsatisfiable core [2022-12-14 14:39:48,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:39:48,264 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:39:48,264 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:39:48,280 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:39:48,280 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [869824279] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:39:48,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1294651079] [2022-12-14 14:39:48,295 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 14:39:48,295 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:39:48,299 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:39:48,305 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:39:48,306 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:39:49,467 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:39:49,804 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '534#(and (<= 6 |ULTIMATE.start_main_~b~0#1|) (<= 6 |ULTIMATE.start_main_~a~0#1|) (<= 6 |ULTIMATE.start_main_~d~0#1|) (<= 6 |ULTIMATE.start_main_~f~0#1|) (<= 6 |ULTIMATE.start_main_~e~0#1|) (<= 6 |ULTIMATE.start_main_~c~0#1|) (or (not (= 6 |ULTIMATE.start_main_~f~0#1|)) (not (= 6 |ULTIMATE.start_main_~a~0#1|)) (not (= 6 |ULTIMATE.start_main_~d~0#1|)) (not (= 6 |ULTIMATE.start_main_~e~0#1|)) (not (= 6 |ULTIMATE.start_main_~c~0#1|)) (not (= 6 |ULTIMATE.start_main_~b~0#1|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 14:39:49,804 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:39:49,804 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:39:49,804 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2022-12-14 14:39:49,805 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1768270708] [2022-12-14 14:39:49,805 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:39:49,805 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-12-14 14:39:49,805 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:39:49,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-12-14 14:39:49,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2022-12-14 14:39:49,806 INFO L87 Difference]: Start difference. First operand 16 states and 21 transitions. Second operand has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:39:49,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:39:49,833 INFO L93 Difference]: Finished difference Result 33 states and 46 transitions. [2022-12-14 14:39:49,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 14:39:49,834 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-12-14 14:39:49,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:39:49,834 INFO L225 Difference]: With dead ends: 33 [2022-12-14 14:39:49,834 INFO L226 Difference]: Without dead ends: 19 [2022-12-14 14:39:49,835 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2022-12-14 14:39:49,836 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:39:49,836 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 22 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:39:49,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-12-14 14:39:49,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-12-14 14:39:49,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 18 states have internal predecessors, (24), 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) [2022-12-14 14:39:49,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 24 transitions. [2022-12-14 14:39:49,839 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 24 transitions. Word has length 15 [2022-12-14 14:39:49,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:39:49,840 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 24 transitions. [2022-12-14 14:39:49,840 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:39:49,840 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 24 transitions. [2022-12-14 14:39:49,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-12-14 14:39:49,840 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:39:49,840 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:39:49,847 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 14:39:50,041 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:39:50,043 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:39:50,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:39:50,044 INFO L85 PathProgramCache]: Analyzing trace with hash 799752818, now seen corresponding path program 2 times [2022-12-14 14:39:50,045 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:39:50,046 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [884788641] [2022-12-14 14:39:50,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:39:50,047 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:39:50,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:39:50,192 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 14:39:50,192 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:39:50,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [884788641] [2022-12-14 14:39:50,193 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [884788641] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:39:50,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [103555687] [2022-12-14 14:39:50,194 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 14:39:50,194 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:39:50,194 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:39:50,195 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:39:50,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 14:39:50,235 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 14:39:50,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:39:50,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 3 conjunts are in the unsatisfiable core [2022-12-14 14:39:50,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:39:50,260 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 14:39:50,260 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:39:50,289 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 14:39:50,289 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [103555687] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:39:50,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1545810848] [2022-12-14 14:39:50,291 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 14:39:50,291 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:39:50,292 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:39:50,292 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:39:50,292 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:39:51,018 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:39:51,295 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '745#(and (<= 6 |ULTIMATE.start_main_~b~0#1|) (<= 6 |ULTIMATE.start_main_~a~0#1|) (<= 6 |ULTIMATE.start_main_~d~0#1|) (<= 6 |ULTIMATE.start_main_~f~0#1|) (<= 6 |ULTIMATE.start_main_~e~0#1|) (<= 6 |ULTIMATE.start_main_~c~0#1|) (or (not (= 6 |ULTIMATE.start_main_~f~0#1|)) (not (= 6 |ULTIMATE.start_main_~a~0#1|)) (not (= 6 |ULTIMATE.start_main_~d~0#1|)) (not (= 6 |ULTIMATE.start_main_~e~0#1|)) (not (= 6 |ULTIMATE.start_main_~c~0#1|)) (not (= 6 |ULTIMATE.start_main_~b~0#1|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 14:39:51,295 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:39:51,295 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:39:51,295 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 8 [2022-12-14 14:39:51,295 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278334666] [2022-12-14 14:39:51,295 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:39:51,296 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 14:39:51,296 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:39:51,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 14:39:51,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2022-12-14 14:39:51,297 INFO L87 Difference]: Start difference. First operand 19 states and 24 transitions. Second operand has 8 states, 8 states have (on average 5.125) internal successors, (41), 8 states have internal predecessors, (41), 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) [2022-12-14 14:39:51,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:39:51,407 INFO L93 Difference]: Finished difference Result 122 states and 162 transitions. [2022-12-14 14:39:51,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-12-14 14:39:51,408 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.125) internal successors, (41), 8 states have internal predecessors, (41), 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 18 [2022-12-14 14:39:51,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:39:51,409 INFO L225 Difference]: With dead ends: 122 [2022-12-14 14:39:51,409 INFO L226 Difference]: Without dead ends: 105 [2022-12-14 14:39:51,410 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=122, Invalid=430, Unknown=0, NotChecked=0, Total=552 [2022-12-14 14:39:51,411 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 40 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:39:51,411 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 18 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:39:51,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2022-12-14 14:39:51,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 85. [2022-12-14 14:39:51,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2976190476190477) internal successors, (109), 84 states have internal predecessors, (109), 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) [2022-12-14 14:39:51,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 109 transitions. [2022-12-14 14:39:51,424 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 109 transitions. Word has length 18 [2022-12-14 14:39:51,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:39:51,424 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 109 transitions. [2022-12-14 14:39:51,425 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.125) internal successors, (41), 8 states have internal predecessors, (41), 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) [2022-12-14 14:39:51,425 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 109 transitions. [2022-12-14 14:39:51,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-12-14 14:39:51,428 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:39:51,428 INFO L195 NwaCegarLoop]: trace histogram [32, 8, 8, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1] [2022-12-14 14:39:51,433 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 14:39:51,629 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:39:51,630 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:39:51,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:39:51,633 INFO L85 PathProgramCache]: Analyzing trace with hash -956315440, now seen corresponding path program 3 times [2022-12-14 14:39:51,633 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:39:51,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [209136996] [2022-12-14 14:39:51,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:39:51,635 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:39:51,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:39:51,766 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 357 proven. 1 refuted. 0 times theorem prover too weak. 582 trivial. 0 not checked. [2022-12-14 14:39:51,766 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:39:51,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [209136996] [2022-12-14 14:39:51,766 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [209136996] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:39:51,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [494821650] [2022-12-14 14:39:51,766 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 14:39:51,766 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:39:51,767 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:39:51,767 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:39:51,776 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 14:39:51,833 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 14:39:51,833 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:39:51,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 6 conjunts are in the unsatisfiable core [2022-12-14 14:39:51,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:39:51,861 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 211 proven. 10 refuted. 0 times theorem prover too weak. 719 trivial. 0 not checked. [2022-12-14 14:39:51,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:39:51,893 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 211 proven. 10 refuted. 0 times theorem prover too weak. 719 trivial. 0 not checked. [2022-12-14 14:39:51,893 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [494821650] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:39:51,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [878487465] [2022-12-14 14:39:51,896 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 14:39:51,896 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:39:51,896 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:39:51,896 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:39:51,896 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:39:52,602 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:39:52,914 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1680#(and (<= 6 |ULTIMATE.start_main_~b~0#1|) (<= 6 |ULTIMATE.start_main_~a~0#1|) (<= 6 |ULTIMATE.start_main_~d~0#1|) (<= 6 |ULTIMATE.start_main_~f~0#1|) (<= 6 |ULTIMATE.start_main_~e~0#1|) (<= 6 |ULTIMATE.start_main_~c~0#1|) (or (not (= 6 |ULTIMATE.start_main_~f~0#1|)) (not (= 6 |ULTIMATE.start_main_~a~0#1|)) (not (= 6 |ULTIMATE.start_main_~d~0#1|)) (not (= 6 |ULTIMATE.start_main_~e~0#1|)) (not (= 6 |ULTIMATE.start_main_~c~0#1|)) (not (= 6 |ULTIMATE.start_main_~b~0#1|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 14:39:52,914 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:39:52,914 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:39:52,914 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 7, 7] total 10 [2022-12-14 14:39:52,914 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434994821] [2022-12-14 14:39:52,914 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:39:52,915 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-12-14 14:39:52,915 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:39:52,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-12-14 14:39:52,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2022-12-14 14:39:52,916 INFO L87 Difference]: Start difference. First operand 85 states and 109 transitions. Second operand has 10 states, 10 states have (on average 3.5) internal successors, (35), 10 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:39:53,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:39:53,079 INFO L93 Difference]: Finished difference Result 323 states and 447 transitions. [2022-12-14 14:39:53,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 14:39:53,080 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.5) internal successors, (35), 10 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 84 [2022-12-14 14:39:53,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:39:53,082 INFO L225 Difference]: With dead ends: 323 [2022-12-14 14:39:53,082 INFO L226 Difference]: Without dead ends: 241 [2022-12-14 14:39:53,083 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 234 SyntacticMatches, 4 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=200, Invalid=670, Unknown=0, NotChecked=0, Total=870 [2022-12-14 14:39:53,084 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 10 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:39:53,084 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 22 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:39:53,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2022-12-14 14:39:53,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 173. [2022-12-14 14:39:53,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 172 states have (on average 1.2151162790697674) internal successors, (209), 172 states have internal predecessors, (209), 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) [2022-12-14 14:39:53,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 209 transitions. [2022-12-14 14:39:53,096 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 209 transitions. Word has length 84 [2022-12-14 14:39:53,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:39:53,096 INFO L495 AbstractCegarLoop]: Abstraction has 173 states and 209 transitions. [2022-12-14 14:39:53,097 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.5) internal successors, (35), 10 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:39:53,097 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 209 transitions. [2022-12-14 14:39:53,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2022-12-14 14:39:53,098 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:39:53,098 INFO L195 NwaCegarLoop]: trace histogram [96, 16, 16, 8, 8, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1] [2022-12-14 14:39:53,102 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 14:39:53,299 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:39:53,299 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:39:53,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:39:53,301 INFO L85 PathProgramCache]: Analyzing trace with hash 1978211716, now seen corresponding path program 4 times [2022-12-14 14:39:53,301 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:39:53,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [413976562] [2022-12-14 14:39:53,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:39:53,302 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:39:53,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:39:53,436 INFO L134 CoverageAnalysis]: Checked inductivity of 6624 backedges. 2510 proven. 1 refuted. 0 times theorem prover too weak. 4113 trivial. 0 not checked. [2022-12-14 14:39:53,436 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:39:53,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [413976562] [2022-12-14 14:39:53,437 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [413976562] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:39:53,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [329282924] [2022-12-14 14:39:53,437 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 14:39:53,437 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:39:53,437 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:39:53,438 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:39:53,438 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 14:39:53,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:39:53,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 544 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 14:39:53,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:39:53,575 INFO L134 CoverageAnalysis]: Checked inductivity of 6624 backedges. 1464 proven. 52 refuted. 0 times theorem prover too weak. 5108 trivial. 0 not checked. [2022-12-14 14:39:53,575 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:39:53,612 INFO L134 CoverageAnalysis]: Checked inductivity of 6624 backedges. 1464 proven. 52 refuted. 0 times theorem prover too weak. 5108 trivial. 0 not checked. [2022-12-14 14:39:53,612 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [329282924] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:39:53,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1483409963] [2022-12-14 14:39:53,614 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 14:39:53,614 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:39:53,614 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:39:53,614 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:39:53,614 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:39:54,265 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:39:54,544 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3729#(and (<= 6 |ULTIMATE.start_main_~b~0#1|) (<= 6 |ULTIMATE.start_main_~a~0#1|) (<= 6 |ULTIMATE.start_main_~d~0#1|) (<= 6 |ULTIMATE.start_main_~f~0#1|) (<= 6 |ULTIMATE.start_main_~e~0#1|) (<= 6 |ULTIMATE.start_main_~c~0#1|) (or (not (= 6 |ULTIMATE.start_main_~f~0#1|)) (not (= 6 |ULTIMATE.start_main_~a~0#1|)) (not (= 6 |ULTIMATE.start_main_~d~0#1|)) (not (= 6 |ULTIMATE.start_main_~e~0#1|)) (not (= 6 |ULTIMATE.start_main_~c~0#1|)) (not (= 6 |ULTIMATE.start_main_~b~0#1|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 14:39:54,544 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:39:54,544 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:39:54,544 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5, 5] total 10 [2022-12-14 14:39:54,544 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611963354] [2022-12-14 14:39:54,544 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:39:54,545 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-12-14 14:39:54,545 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:39:54,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-12-14 14:39:54,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2022-12-14 14:39:54,546 INFO L87 Difference]: Start difference. First operand 173 states and 209 transitions. Second operand has 10 states, 10 states have (on average 4.3) internal successors, (43), 10 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:39:54,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:39:54,776 INFO L93 Difference]: Finished difference Result 1411 states and 1735 transitions. [2022-12-14 14:39:54,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 14:39:54,776 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.3) internal successors, (43), 10 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 172 [2022-12-14 14:39:54,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:39:54,778 INFO L225 Difference]: With dead ends: 1411 [2022-12-14 14:39:54,779 INFO L226 Difference]: Without dead ends: 1241 [2022-12-14 14:39:54,779 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 530 GetRequests, 502 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 165 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=200, Invalid=670, Unknown=0, NotChecked=0, Total=870 [2022-12-14 14:39:54,780 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 34 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:39:54,780 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 20 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:39:54,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1241 states. [2022-12-14 14:39:54,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1241 to 837. [2022-12-14 14:39:54,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 837 states, 836 states have (on average 1.1543062200956937) internal successors, (965), 836 states have internal predecessors, (965), 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) [2022-12-14 14:39:54,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 837 states to 837 states and 965 transitions. [2022-12-14 14:39:54,843 INFO L78 Accepts]: Start accepts. Automaton has 837 states and 965 transitions. Word has length 172 [2022-12-14 14:39:54,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:39:54,843 INFO L495 AbstractCegarLoop]: Abstraction has 837 states and 965 transitions. [2022-12-14 14:39:54,843 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 4.3) internal successors, (43), 10 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:39:54,843 INFO L276 IsEmpty]: Start isEmpty. Operand 837 states and 965 transitions. [2022-12-14 14:39:54,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 837 [2022-12-14 14:39:54,859 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:39:54,859 INFO L195 NwaCegarLoop]: trace histogram [576, 96, 96, 16, 16, 8, 8, 4, 4, 4, 4, 1, 1, 1, 1] [2022-12-14 14:39:54,865 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 14:39:55,060 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-12-14 14:39:55,061 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:39:55,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:39:55,062 INFO L85 PathProgramCache]: Analyzing trace with hash 904388668, now seen corresponding path program 5 times [2022-12-14 14:39:55,063 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:39:55,063 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [390203487] [2022-12-14 14:39:55,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:39:55,064 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:39:55,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:39:55,673 INFO L134 CoverageAnalysis]: Checked inductivity of 232052 backedges. 87175 proven. 1 refuted. 0 times theorem prover too weak. 144876 trivial. 0 not checked. [2022-12-14 14:39:55,673 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:39:55,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [390203487] [2022-12-14 14:39:55,674 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [390203487] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:39:55,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [272615707] [2022-12-14 14:39:55,674 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 14:39:55,674 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:39:55,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:39:55,675 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:39:55,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 14:39:55,920 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 105 check-sat command(s) [2022-12-14 14:39:55,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:39:55,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 664 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 14:39:55,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:39:56,062 INFO L134 CoverageAnalysis]: Checked inductivity of 232052 backedges. 50849 proven. 1816 refuted. 0 times theorem prover too weak. 179387 trivial. 0 not checked. [2022-12-14 14:39:56,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:39:56,183 INFO L134 CoverageAnalysis]: Checked inductivity of 232052 backedges. 50849 proven. 1816 refuted. 0 times theorem prover too weak. 179387 trivial. 0 not checked. [2022-12-14 14:39:56,183 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [272615707] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:39:56,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [778655596] [2022-12-14 14:39:56,186 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 14:39:56,186 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:39:56,186 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:39:56,186 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:39:56,186 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:39:56,812 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:39:57,115 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13266#(and (<= 6 |ULTIMATE.start_main_~b~0#1|) (<= 6 |ULTIMATE.start_main_~a~0#1|) (<= 6 |ULTIMATE.start_main_~d~0#1|) (<= 6 |ULTIMATE.start_main_~f~0#1|) (<= 6 |ULTIMATE.start_main_~e~0#1|) (<= 6 |ULTIMATE.start_main_~c~0#1|) (or (not (= 6 |ULTIMATE.start_main_~f~0#1|)) (not (= 6 |ULTIMATE.start_main_~a~0#1|)) (not (= 6 |ULTIMATE.start_main_~d~0#1|)) (not (= 6 |ULTIMATE.start_main_~e~0#1|)) (not (= 6 |ULTIMATE.start_main_~c~0#1|)) (not (= 6 |ULTIMATE.start_main_~b~0#1|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 14:39:57,116 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:39:57,116 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:39:57,116 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5, 5] total 10 [2022-12-14 14:39:57,116 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656948923] [2022-12-14 14:39:57,116 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:39:57,117 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-12-14 14:39:57,117 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:39:57,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-12-14 14:39:57,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2022-12-14 14:39:57,117 INFO L87 Difference]: Start difference. First operand 837 states and 965 transitions. Second operand has 10 states, 10 states have (on average 6.1) internal successors, (61), 10 states have internal predecessors, (61), 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) [2022-12-14 14:39:57,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:39:57,969 INFO L93 Difference]: Finished difference Result 8115 states and 9391 transitions. [2022-12-14 14:39:57,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 14:39:57,970 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 6.1) internal successors, (61), 10 states have internal predecessors, (61), 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 836 [2022-12-14 14:39:57,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:39:57,986 INFO L225 Difference]: With dead ends: 8115 [2022-12-14 14:39:57,986 INFO L226 Difference]: Without dead ends: 7281 [2022-12-14 14:39:57,989 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2522 GetRequests, 2494 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 165 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=200, Invalid=670, Unknown=0, NotChecked=0, Total=870 [2022-12-14 14:39:57,989 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 58 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:39:57,989 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 19 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:39:57,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7281 states. [2022-12-14 14:39:58,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7281 to 4861. [2022-12-14 14:39:58,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4861 states, 4860 states have (on average 1.144238683127572) internal successors, (5561), 4860 states have internal predecessors, (5561), 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) [2022-12-14 14:39:58,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4861 states to 4861 states and 5561 transitions. [2022-12-14 14:39:58,507 INFO L78 Accepts]: Start accepts. Automaton has 4861 states and 5561 transitions. Word has length 836 [2022-12-14 14:39:58,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:39:58,508 INFO L495 AbstractCegarLoop]: Abstraction has 4861 states and 5561 transitions. [2022-12-14 14:39:58,508 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 6.1) internal successors, (61), 10 states have internal predecessors, (61), 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) [2022-12-14 14:39:58,508 INFO L276 IsEmpty]: Start isEmpty. Operand 4861 states and 5561 transitions. [2022-12-14 14:39:58,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4861 [2022-12-14 14:39:58,665 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:39:58,666 INFO L195 NwaCegarLoop]: trace histogram [3456, 576, 576, 96, 96, 16, 16, 8, 8, 4, 4, 1, 1, 1, 1] [2022-12-14 14:39:58,671 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 14:39:58,866 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:39:58,867 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:39:58,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:39:58,870 INFO L85 PathProgramCache]: Analyzing trace with hash -502707176, now seen corresponding path program 6 times [2022-12-14 14:39:58,871 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:39:58,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1994089862] [2022-12-14 14:39:58,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:39:58,872 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:40:00,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:40:08,103 INFO L134 CoverageAnalysis]: Checked inductivity of 8358520 backedges. 1828954 proven. 65320 refuted. 0 times theorem prover too weak. 6464246 trivial. 0 not checked. [2022-12-14 14:40:08,104 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:40:08,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1994089862] [2022-12-14 14:40:08,104 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1994089862] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:40:08,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1519501208] [2022-12-14 14:40:08,105 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 14:40:08,105 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:40:08,105 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:40:08,106 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:40:08,107 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 14:40:10,064 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 14:40:10,064 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:40:10,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 14573 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 14:40:10,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:40:10,927 INFO L134 CoverageAnalysis]: Checked inductivity of 8358520 backedges. 1828954 proven. 65320 refuted. 0 times theorem prover too weak. 6464246 trivial. 0 not checked. [2022-12-14 14:40:10,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:40:11,656 INFO L134 CoverageAnalysis]: Checked inductivity of 8358520 backedges. 1828954 proven. 65320 refuted. 0 times theorem prover too weak. 6464246 trivial. 0 not checked. [2022-12-14 14:40:11,657 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1519501208] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:40:11,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [210963786] [2022-12-14 14:40:11,659 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 14:40:11,659 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:40:11,659 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:40:11,659 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:40:11,660 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:40:12,362 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:40:12,840 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '68402#(and (<= 6 |ULTIMATE.start_main_~b~0#1|) (<= 6 |ULTIMATE.start_main_~a~0#1|) (<= 6 |ULTIMATE.start_main_~d~0#1|) (<= 6 |ULTIMATE.start_main_~f~0#1|) (<= 6 |ULTIMATE.start_main_~e~0#1|) (<= 6 |ULTIMATE.start_main_~c~0#1|) (or (not (= 6 |ULTIMATE.start_main_~f~0#1|)) (not (= 6 |ULTIMATE.start_main_~a~0#1|)) (not (= 6 |ULTIMATE.start_main_~d~0#1|)) (not (= 6 |ULTIMATE.start_main_~e~0#1|)) (not (= 6 |ULTIMATE.start_main_~c~0#1|)) (not (= 6 |ULTIMATE.start_main_~b~0#1|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 14:40:12,840 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:40:12,840 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:40:12,841 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2022-12-14 14:40:12,841 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866319426] [2022-12-14 14:40:12,842 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:40:12,845 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-12-14 14:40:12,845 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:40:12,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-12-14 14:40:12,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=204, Unknown=0, NotChecked=0, Total=272 [2022-12-14 14:40:12,845 INFO L87 Difference]: Start difference. First operand 4861 states and 5561 transitions. Second operand has 9 states, 9 states have (on average 6.222222222222222) internal successors, (56), 9 states have internal predecessors, (56), 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) [2022-12-14 14:40:14,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:40:14,128 INFO L93 Difference]: Finished difference Result 18778 states and 21499 transitions. [2022-12-14 14:40:14,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 14:40:14,129 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 6.222222222222222) internal successors, (56), 9 states have internal predecessors, (56), 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 4860 [2022-12-14 14:40:14,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:40:14,201 INFO L225 Difference]: With dead ends: 18778 [2022-12-14 14:40:14,201 INFO L226 Difference]: Without dead ends: 14525 [2022-12-14 14:40:14,211 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14583 GetRequests, 14568 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=204, Unknown=0, NotChecked=0, Total=272 [2022-12-14 14:40:14,212 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 12 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:40:14,212 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 22 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:40:14,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14525 states. [2022-12-14 14:40:15,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14525 to 14525. [2022-12-14 14:40:15,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14525 states, 14524 states have (on average 1.143004681905811) internal successors, (16601), 14524 states have internal predecessors, (16601), 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) [2022-12-14 14:40:15,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14525 states to 14525 states and 16601 transitions. [2022-12-14 14:40:15,559 INFO L78 Accepts]: Start accepts. Automaton has 14525 states and 16601 transitions. Word has length 4860 [2022-12-14 14:40:15,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:40:15,560 INFO L495 AbstractCegarLoop]: Abstraction has 14525 states and 16601 transitions. [2022-12-14 14:40:15,560 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 6.222222222222222) internal successors, (56), 9 states have internal predecessors, (56), 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) [2022-12-14 14:40:15,560 INFO L276 IsEmpty]: Start isEmpty. Operand 14525 states and 16601 transitions. [2022-12-14 14:40:16,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14525 [2022-12-14 14:40:16,960 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:40:16,962 INFO L195 NwaCegarLoop]: trace histogram [10368, 1728, 1728, 288, 288, 48, 48, 8, 8, 4, 4, 1, 1, 1, 1] [2022-12-14 14:40:16,985 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-12-14 14:40:17,163 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:40:17,164 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:40:17,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:40:17,170 INFO L85 PathProgramCache]: Analyzing trace with hash -464506792, now seen corresponding path program 7 times [2022-12-14 14:40:17,171 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:40:17,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249133931] [2022-12-14 14:40:17,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:40:17,173 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:40:40,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:41:45,143 INFO L134 CoverageAnalysis]: Checked inductivity of 75239576 backedges. 28217563 proven. 2351464 refuted. 0 times theorem prover too weak. 44670549 trivial. 0 not checked. [2022-12-14 14:41:45,144 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:41:45,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249133931] [2022-12-14 14:41:45,144 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [249133931] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:41:45,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [611491860] [2022-12-14 14:41:45,144 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 14:41:45,144 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:41:45,144 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:41:45,145 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:41:45,146 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 14:41:50,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:41:51,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 43600 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 14:41:51,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:41:57,790 INFO L134 CoverageAnalysis]: Checked inductivity of 75239576 backedges. 28217563 proven. 2351464 refuted. 0 times theorem prover too weak. 44670549 trivial. 0 not checked. [2022-12-14 14:41:57,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:42:03,700 INFO L134 CoverageAnalysis]: Checked inductivity of 75239576 backedges. 28217563 proven. 2351464 refuted. 0 times theorem prover too weak. 44670549 trivial. 0 not checked. [2022-12-14 14:42:03,700 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [611491860] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:42:03,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1272100960] [2022-12-14 14:42:03,709 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-12-14 14:42:03,709 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:42:03,709 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:42:03,709 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:42:03,709 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:42:04,253 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:42:04,981 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '222152#(and (<= 6 |ULTIMATE.start_main_~b~0#1|) (<= 6 |ULTIMATE.start_main_~a~0#1|) (<= 6 |ULTIMATE.start_main_~d~0#1|) (<= 6 |ULTIMATE.start_main_~f~0#1|) (<= 6 |ULTIMATE.start_main_~e~0#1|) (<= 6 |ULTIMATE.start_main_~c~0#1|) (or (not (= 6 |ULTIMATE.start_main_~f~0#1|)) (not (= 6 |ULTIMATE.start_main_~a~0#1|)) (not (= 6 |ULTIMATE.start_main_~d~0#1|)) (not (= 6 |ULTIMATE.start_main_~e~0#1|)) (not (= 6 |ULTIMATE.start_main_~c~0#1|)) (not (= 6 |ULTIMATE.start_main_~b~0#1|))) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 14:42:04,981 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:42:04,981 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:42:04,984 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2022-12-14 14:42:04,984 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164524484] [2022-12-14 14:42:04,984 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:42:04,991 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-12-14 14:42:04,991 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:42:04,992 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-12-14 14:42:04,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=204, Unknown=0, NotChecked=0, Total=272 [2022-12-14 14:42:04,992 INFO L87 Difference]: Start difference. First operand 14525 states and 16601 transitions. Second operand has 9 states, 9 states have (on average 7.222222222222222) internal successors, (65), 9 states have internal predecessors, (65), 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) [2022-12-14 14:42:09,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:42:09,101 INFO L93 Difference]: Finished difference Result 54443 states and 62236 transitions. [2022-12-14 14:42:09,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 14:42:09,101 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 7.222222222222222) internal successors, (65), 9 states have internal predecessors, (65), 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 14524 [2022-12-14 14:42:09,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:42:09,176 INFO L225 Difference]: With dead ends: 54443 [2022-12-14 14:42:09,176 INFO L226 Difference]: Without dead ends: 43549 [2022-12-14 14:42:09,193 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 43575 GetRequests, 43560 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=68, Invalid=204, Unknown=0, NotChecked=0, Total=272 [2022-12-14 14:42:09,194 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 16 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:42:09,194 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 24 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:42:09,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43549 states. [2022-12-14 14:42:12,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43549 to 43549. [2022-12-14 14:42:13,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43549 states, 43548 states have (on average 1.1428538624047029) internal successors, (49769), 43548 states have internal predecessors, (49769), 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) [2022-12-14 14:42:13,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43549 states to 43549 states and 49769 transitions. [2022-12-14 14:42:13,065 INFO L78 Accepts]: Start accepts. Automaton has 43549 states and 49769 transitions. Word has length 14524 [2022-12-14 14:42:13,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:42:13,068 INFO L495 AbstractCegarLoop]: Abstraction has 43549 states and 49769 transitions. [2022-12-14 14:42:13,069 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 7.222222222222222) internal successors, (65), 9 states have internal predecessors, (65), 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) [2022-12-14 14:42:13,069 INFO L276 IsEmpty]: Start isEmpty. Operand 43549 states and 49769 transitions. [2022-12-14 14:42:22,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43549 [2022-12-14 14:42:22,400 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:42:22,406 INFO L195 NwaCegarLoop]: trace histogram [31104, 5184, 5184, 864, 864, 144, 144, 24, 24, 4, 4, 1, 1, 1, 1] [2022-12-14 14:42:22,471 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 14:42:22,606 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_735bc458-a04b-450c-93df-237bb040896f/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:42:22,607 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:42:22,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:42:22,624 INFO L85 PathProgramCache]: Analyzing trace with hash -46089784, now seen corresponding path program 8 times [2022-12-14 14:42:22,624 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:42:22,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [206869314] [2022-12-14 14:42:22,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:42:22,629 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms