./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/fragtest_simple.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 8393723b Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/fragtest_simple.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS --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 be3b53cc5f9badbf5402cafcfa5766831674eb009261bc7c1bcbe9580aece38e --- 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-8393723 [2022-11-19 07:08:06,956 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-19 07:08:06,958 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-19 07:08:06,998 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-19 07:08:06,999 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-19 07:08:07,003 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-19 07:08:07,005 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-19 07:08:07,008 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-19 07:08:07,012 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-19 07:08:07,015 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-19 07:08:07,016 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-19 07:08:07,017 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-19 07:08:07,017 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-19 07:08:07,018 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-19 07:08:07,019 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-19 07:08:07,020 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-19 07:08:07,021 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-19 07:08:07,022 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-19 07:08:07,028 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-19 07:08:07,035 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-19 07:08:07,037 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-19 07:08:07,039 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-19 07:08:07,042 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-19 07:08:07,043 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-19 07:08:07,052 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-19 07:08:07,052 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-19 07:08:07,053 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-19 07:08:07,055 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-19 07:08:07,055 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-19 07:08:07,056 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-19 07:08:07,057 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-19 07:08:07,058 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-19 07:08:07,060 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-19 07:08:07,061 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-19 07:08:07,062 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-19 07:08:07,063 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-19 07:08:07,065 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-19 07:08:07,065 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-19 07:08:07,065 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-19 07:08:07,066 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-19 07:08:07,067 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-19 07:08:07,068 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-19 07:08:07,103 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-19 07:08:07,103 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-19 07:08:07,104 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-19 07:08:07,104 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-19 07:08:07,105 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-19 07:08:07,105 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-19 07:08:07,106 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-19 07:08:07,106 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-19 07:08:07,106 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-19 07:08:07,107 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-19 07:08:07,108 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-19 07:08:07,108 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-19 07:08:07,109 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-19 07:08:07,109 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-19 07:08:07,109 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-19 07:08:07,109 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-19 07:08:07,110 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-19 07:08:07,110 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-19 07:08:07,111 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-19 07:08:07,111 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-19 07:08:07,112 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-19 07:08:07,112 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-19 07:08:07,112 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-19 07:08:07,112 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-19 07:08:07,113 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-19 07:08:07,113 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-19 07:08:07,113 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-19 07:08:07,114 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-19 07:08:07,114 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-19 07:08:07,114 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-19 07:08:07,115 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-19 07:08:07,115 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-19 07:08:07,115 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 07:08:07,116 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-19 07:08:07,116 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-19 07:08:07,116 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-19 07:08:07,117 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-19 07:08:07,117 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-19 07:08:07,117 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-19 07:08:07,118 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-19 07:08:07,118 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-19 07:08:07,118 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_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> be3b53cc5f9badbf5402cafcfa5766831674eb009261bc7c1bcbe9580aece38e [2022-11-19 07:08:07,395 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-19 07:08:07,417 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-19 07:08:07,420 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-19 07:08:07,421 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-19 07:08:07,422 INFO L275 PluginConnector]: CDTParser initialized [2022-11-19 07:08:07,424 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/../../sv-benchmarks/c/loop-invgen/fragtest_simple.i [2022-11-19 07:08:07,501 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/data/113e278a9/3b22d6aa2a894d14871c123882c2ee28/FLAGe37d74658 [2022-11-19 07:08:07,989 INFO L306 CDTParser]: Found 1 translation units. [2022-11-19 07:08:07,990 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/sv-benchmarks/c/loop-invgen/fragtest_simple.i [2022-11-19 07:08:08,003 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/data/113e278a9/3b22d6aa2a894d14871c123882c2ee28/FLAGe37d74658 [2022-11-19 07:08:08,403 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/data/113e278a9/3b22d6aa2a894d14871c123882c2ee28 [2022-11-19 07:08:08,405 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-19 07:08:08,407 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-19 07:08:08,410 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-19 07:08:08,411 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-19 07:08:08,414 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-19 07:08:08,415 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 07:08:08" (1/1) ... [2022-11-19 07:08:08,416 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@27f1ad6e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:08:08, skipping insertion in model container [2022-11-19 07:08:08,416 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 07:08:08" (1/1) ... [2022-11-19 07:08:08,423 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-19 07:08:08,437 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-19 07:08:08,627 WARN L234 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_8d95a582-a6c9-4741-9e00-9600daaf51f4/sv-benchmarks/c/loop-invgen/fragtest_simple.i[893,906] [2022-11-19 07:08:08,641 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 07:08:08,649 INFO L203 MainTranslator]: Completed pre-run [2022-11-19 07:08:08,661 WARN L234 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_8d95a582-a6c9-4741-9e00-9600daaf51f4/sv-benchmarks/c/loop-invgen/fragtest_simple.i[893,906] [2022-11-19 07:08:08,666 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 07:08:08,680 INFO L208 MainTranslator]: Completed translation [2022-11-19 07:08:08,680 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:08:08 WrapperNode [2022-11-19 07:08:08,681 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-19 07:08:08,682 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-19 07:08:08,682 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-19 07:08:08,682 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-19 07:08:08,690 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:08:08" (1/1) ... [2022-11-19 07:08:08,696 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:08:08" (1/1) ... [2022-11-19 07:08:08,715 INFO L138 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 59 [2022-11-19 07:08:08,715 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-19 07:08:08,716 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-19 07:08:08,716 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-19 07:08:08,716 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-19 07:08:08,725 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:08:08" (1/1) ... [2022-11-19 07:08:08,725 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:08:08" (1/1) ... [2022-11-19 07:08:08,727 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:08:08" (1/1) ... [2022-11-19 07:08:08,727 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:08:08" (1/1) ... [2022-11-19 07:08:08,730 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:08:08" (1/1) ... [2022-11-19 07:08:08,734 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:08:08" (1/1) ... [2022-11-19 07:08:08,735 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:08:08" (1/1) ... [2022-11-19 07:08:08,736 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:08:08" (1/1) ... [2022-11-19 07:08:08,737 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-19 07:08:08,738 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-19 07:08:08,738 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-19 07:08:08,738 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-19 07:08:08,739 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:08:08" (1/1) ... [2022-11-19 07:08:08,746 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 07:08:08,756 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:08,770 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-19 07:08:08,795 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-19 07:08:08,816 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-19 07:08:08,816 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-19 07:08:08,817 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-19 07:08:08,817 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-19 07:08:08,875 INFO L235 CfgBuilder]: Building ICFG [2022-11-19 07:08:08,877 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-19 07:08:08,987 INFO L276 CfgBuilder]: Performing block encoding [2022-11-19 07:08:09,010 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-19 07:08:09,010 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-19 07:08:09,013 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 07:08:09 BoogieIcfgContainer [2022-11-19 07:08:09,013 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-19 07:08:09,016 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-19 07:08:09,016 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-19 07:08:09,020 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-19 07:08:09,020 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 07:08:08" (1/3) ... [2022-11-19 07:08:09,021 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4cb9c483 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 07:08:09, skipping insertion in model container [2022-11-19 07:08:09,021 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:08:08" (2/3) ... [2022-11-19 07:08:09,022 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4cb9c483 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 07:08:09, skipping insertion in model container [2022-11-19 07:08:09,022 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 07:08:09" (3/3) ... [2022-11-19 07:08:09,024 INFO L112 eAbstractionObserver]: Analyzing ICFG fragtest_simple.i [2022-11-19 07:08:09,043 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-19 07:08:09,044 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-19 07:08:09,094 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-19 07:08:09,102 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;@7a266d70, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-19 07:08:09,102 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-19 07:08:09,106 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 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) [2022-11-19 07:08:09,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-19 07:08:09,113 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:09,114 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:09,114 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:09,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:09,120 INFO L85 PathProgramCache]: Analyzing trace with hash 1621408492, now seen corresponding path program 1 times [2022-11-19 07:08:09,129 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:09,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [629189228] [2022-11-19 07:08:09,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:09,131 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:09,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:09,256 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:09,256 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:09,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [629189228] [2022-11-19 07:08:09,258 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [629189228] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:08:09,258 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:08:09,258 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-19 07:08:09,260 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1746151740] [2022-11-19 07:08:09,261 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:08:09,265 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-19 07:08:09,265 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:09,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-19 07:08:09,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-19 07:08:09,296 INFO L87 Difference]: Start difference. First operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 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) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:09,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:09,321 INFO L93 Difference]: Finished difference Result 27 states and 37 transitions. [2022-11-19 07:08:09,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-19 07:08:09,341 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 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 [2022-11-19 07:08:09,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:09,348 INFO L225 Difference]: With dead ends: 27 [2022-11-19 07:08:09,348 INFO L226 Difference]: Without dead ends: 13 [2022-11-19 07:08:09,351 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-19 07:08:09,354 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:09,355 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 07:08:09,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-11-19 07:08:09,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-11-19 07:08:09,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:09,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2022-11-19 07:08:09,433 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 8 [2022-11-19 07:08:09,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:09,433 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2022-11-19 07:08:09,433 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:09,434 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2022-11-19 07:08:09,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-19 07:08:09,434 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:09,434 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:09,435 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-19 07:08:09,435 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:09,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:09,436 INFO L85 PathProgramCache]: Analyzing trace with hash -134467088, now seen corresponding path program 1 times [2022-11-19 07:08:09,436 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:09,437 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60997284] [2022-11-19 07:08:09,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:09,437 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:09,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:09,686 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:09,686 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:09,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60997284] [2022-11-19 07:08:09,687 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [60997284] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:08:09,687 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:08:09,687 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 07:08:09,688 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1362378717] [2022-11-19 07:08:09,688 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:08:09,689 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 07:08:09,690 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:09,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 07:08:09,691 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-19 07:08:09,691 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 4 states, 4 states have (on average 2.5) 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) [2022-11-19 07:08:09,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:09,728 INFO L93 Difference]: Finished difference Result 18 states and 20 transitions. [2022-11-19 07:08:09,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-19 07:08:09,729 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) 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 [2022-11-19 07:08:09,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:09,729 INFO L225 Difference]: With dead ends: 18 [2022-11-19 07:08:09,730 INFO L226 Difference]: Without dead ends: 16 [2022-11-19 07:08:09,730 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-19 07:08:09,732 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 7 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:09,732 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 21 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 07:08:09,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-11-19 07:08:09,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2022-11-19 07:08:09,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 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) [2022-11-19 07:08:09,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2022-11-19 07:08:09,737 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2022-11-19 07:08:09,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:09,738 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2022-11-19 07:08:09,738 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) 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) [2022-11-19 07:08:09,738 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2022-11-19 07:08:09,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-19 07:08:09,739 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:09,739 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:09,740 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-19 07:08:09,740 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:09,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:09,741 INFO L85 PathProgramCache]: Analyzing trace with hash 1655368611, now seen corresponding path program 1 times [2022-11-19 07:08:09,741 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:09,741 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1726059772] [2022-11-19 07:08:09,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:09,742 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:09,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:09,948 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:09,949 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:09,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1726059772] [2022-11-19 07:08:09,949 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1726059772] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:08:09,950 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:08:09,950 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-19 07:08:09,950 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397642378] [2022-11-19 07:08:09,950 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:08:09,951 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 07:08:09,951 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:09,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 07:08:09,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-19 07:08:09,952 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:10,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:10,006 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2022-11-19 07:08:10,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-19 07:08:10,007 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-19 07:08:10,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:10,008 INFO L225 Difference]: With dead ends: 31 [2022-11-19 07:08:10,008 INFO L226 Difference]: Without dead ends: 20 [2022-11-19 07:08:10,008 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-19 07:08:10,010 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 5 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:10,011 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 26 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 07:08:10,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-19 07:08:10,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2022-11-19 07:08:10,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 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) [2022-11-19 07:08:10,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2022-11-19 07:08:10,017 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 14 [2022-11-19 07:08:10,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:10,018 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2022-11-19 07:08:10,018 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:10,018 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2022-11-19 07:08:10,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-19 07:08:10,019 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:10,019 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:10,019 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-19 07:08:10,020 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:10,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:10,021 INFO L85 PathProgramCache]: Analyzing trace with hash 233966664, now seen corresponding path program 1 times [2022-11-19 07:08:10,021 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:10,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112058792] [2022-11-19 07:08:10,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:10,022 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:10,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:10,264 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:10,264 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:10,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112058792] [2022-11-19 07:08:10,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2112058792] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:10,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1442221073] [2022-11-19 07:08:10,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:10,265 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:10,266 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:10,274 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:10,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-19 07:08:10,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:10,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-19 07:08:10,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:10,516 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:10,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:10,577 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:10,578 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1442221073] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:10,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1202158763] [2022-11-19 07:08:10,597 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:08:10,597 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:10,601 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:10,607 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:10,608 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:11,001 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:11,465 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '297#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:08:11,465 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:11,465 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:11,465 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 6] total 12 [2022-11-19 07:08:11,465 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116541606] [2022-11-19 07:08:11,466 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:11,466 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-19 07:08:11,466 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:11,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-19 07:08:11,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2022-11-19 07:08:11,468 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:11,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:11,677 INFO L93 Difference]: Finished difference Result 41 states and 47 transitions. [2022-11-19 07:08:11,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-19 07:08:11,677 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-11-19 07:08:11,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:11,678 INFO L225 Difference]: With dead ends: 41 [2022-11-19 07:08:11,678 INFO L226 Difference]: Without dead ends: 30 [2022-11-19 07:08:11,679 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=131, Invalid=681, Unknown=0, NotChecked=0, Total=812 [2022-11-19 07:08:11,680 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 46 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:11,681 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 41 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:08:11,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-19 07:08:11,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 23. [2022-11-19 07:08:11,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:11,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2022-11-19 07:08:11,687 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 16 [2022-11-19 07:08:11,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:11,687 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2022-11-19 07:08:11,687 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:11,688 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2022-11-19 07:08:11,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-19 07:08:11,688 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:11,689 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:11,703 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-19 07:08:11,898 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:11,899 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:11,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:11,899 INFO L85 PathProgramCache]: Analyzing trace with hash 885992160, now seen corresponding path program 2 times [2022-11-19 07:08:11,899 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:11,899 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1179595413] [2022-11-19 07:08:11,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:11,900 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:11,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:12,098 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 5 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:12,098 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:12,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1179595413] [2022-11-19 07:08:12,099 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1179595413] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:12,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1177734990] [2022-11-19 07:08:12,103 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:08:12,104 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:12,104 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:12,107 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:12,146 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-19 07:08:12,177 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-19 07:08:12,177 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:08:12,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-19 07:08:12,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:12,296 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:12,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:12,371 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:12,371 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1177734990] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:12,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [995858650] [2022-11-19 07:08:12,376 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:08:12,377 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:12,377 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:12,378 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:12,378 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:12,625 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:13,045 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '552#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:08:13,046 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:13,046 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:13,046 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2022-11-19 07:08:13,046 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [144819738] [2022-11-19 07:08:13,046 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:13,047 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-19 07:08:13,047 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:13,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-19 07:08:13,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2022-11-19 07:08:13,048 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 13 states, 13 states have (on average 2.923076923076923) internal successors, (38), 13 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:13,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:13,148 INFO L93 Difference]: Finished difference Result 49 states and 55 transitions. [2022-11-19 07:08:13,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-19 07:08:13,148 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.923076923076923) internal successors, (38), 13 states have internal predecessors, (38), 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 22 [2022-11-19 07:08:13,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:13,150 INFO L225 Difference]: With dead ends: 49 [2022-11-19 07:08:13,150 INFO L226 Difference]: Without dead ends: 34 [2022-11-19 07:08:13,151 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 48 SyntacticMatches, 4 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=103, Invalid=497, Unknown=0, NotChecked=0, Total=600 [2022-11-19 07:08:13,152 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 22 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:13,152 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 47 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:08:13,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-11-19 07:08:13,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 25. [2022-11-19 07:08:13,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.125) internal successors, (27), 24 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:13,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2022-11-19 07:08:13,158 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 22 [2022-11-19 07:08:13,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:13,158 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2022-11-19 07:08:13,159 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.923076923076923) internal successors, (38), 13 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:13,159 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2022-11-19 07:08:13,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-19 07:08:13,159 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:13,159 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:13,172 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-19 07:08:13,367 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:13,367 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:13,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:13,368 INFO L85 PathProgramCache]: Analyzing trace with hash -955132283, now seen corresponding path program 3 times [2022-11-19 07:08:13,368 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:13,368 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [146899363] [2022-11-19 07:08:13,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:13,368 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:13,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:13,478 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:13,478 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:13,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [146899363] [2022-11-19 07:08:13,478 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [146899363] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:13,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [258731237] [2022-11-19 07:08:13,479 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:08:13,479 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:13,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:13,480 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:13,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-19 07:08:13,535 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:08:13,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:08:13,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-19 07:08:13,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:13,594 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:13,594 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:13,651 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:13,652 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [258731237] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:13,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1368204870] [2022-11-19 07:08:13,654 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:08:13,654 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:13,655 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:13,655 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:13,655 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:13,823 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:14,177 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '818#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:08:14,177 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:14,177 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:14,177 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 9 [2022-11-19 07:08:14,178 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155311224] [2022-11-19 07:08:14,178 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:14,178 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-19 07:08:14,178 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:14,179 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-19 07:08:14,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2022-11-19 07:08:14,179 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 10 states, 10 states have (on average 4.5) internal successors, (45), 9 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:14,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:14,304 INFO L93 Difference]: Finished difference Result 42 states and 45 transitions. [2022-11-19 07:08:14,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-19 07:08:14,304 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.5) internal successors, (45), 9 states have internal predecessors, (45), 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 24 [2022-11-19 07:08:14,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:14,305 INFO L225 Difference]: With dead ends: 42 [2022-11-19 07:08:14,305 INFO L226 Difference]: Without dead ends: 40 [2022-11-19 07:08:14,306 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 57 SyntacticMatches, 4 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=132, Invalid=468, Unknown=0, NotChecked=0, Total=600 [2022-11-19 07:08:14,307 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 34 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:14,307 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 60 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:08:14,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-19 07:08:14,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 33. [2022-11-19 07:08:14,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.09375) internal successors, (35), 32 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:14,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2022-11-19 07:08:14,313 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 24 [2022-11-19 07:08:14,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:14,313 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2022-11-19 07:08:14,314 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 4.5) internal successors, (45), 9 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:14,314 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2022-11-19 07:08:14,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-19 07:08:14,314 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:14,315 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:14,324 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-19 07:08:14,515 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:14,516 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:14,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:14,516 INFO L85 PathProgramCache]: Analyzing trace with hash 204854123, now seen corresponding path program 4 times [2022-11-19 07:08:14,516 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:14,516 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766462067] [2022-11-19 07:08:14,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:14,517 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:14,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:14,733 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 23 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:14,735 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:14,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766462067] [2022-11-19 07:08:14,736 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1766462067] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:14,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [814039819] [2022-11-19 07:08:14,736 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:08:14,736 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:14,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:14,739 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:14,763 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-19 07:08:14,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:14,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-19 07:08:14,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:14,921 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 30 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:08:14,921 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:15,003 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 30 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:08:15,003 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [814039819] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:15,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1467422057] [2022-11-19 07:08:15,006 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:08:15,006 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:15,006 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:15,006 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:15,007 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:15,167 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:15,561 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1148#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:08:15,562 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:15,562 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:15,562 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 17 [2022-11-19 07:08:15,562 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805859679] [2022-11-19 07:08:15,562 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:15,563 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-19 07:08:15,563 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:15,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-19 07:08:15,564 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=545, Unknown=0, NotChecked=0, Total=650 [2022-11-19 07:08:15,564 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand has 17 states, 17 states have (on average 3.2941176470588234) internal successors, (56), 17 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) [2022-11-19 07:08:15,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:15,709 INFO L93 Difference]: Finished difference Result 68 states and 75 transitions. [2022-11-19 07:08:15,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-19 07:08:15,709 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.2941176470588234) internal successors, (56), 17 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 32 [2022-11-19 07:08:15,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:15,710 INFO L225 Difference]: With dead ends: 68 [2022-11-19 07:08:15,710 INFO L226 Difference]: Without dead ends: 47 [2022-11-19 07:08:15,711 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 75 SyntacticMatches, 6 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 295 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=147, Invalid=723, Unknown=0, NotChecked=0, Total=870 [2022-11-19 07:08:15,712 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 20 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:15,712 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 88 Invalid, 117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:08:15,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-11-19 07:08:15,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 35. [2022-11-19 07:08:15,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:15,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2022-11-19 07:08:15,718 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 32 [2022-11-19 07:08:15,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:15,718 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2022-11-19 07:08:15,718 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 3.2941176470588234) internal successors, (56), 17 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) [2022-11-19 07:08:15,718 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2022-11-19 07:08:15,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-19 07:08:15,719 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:15,719 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:15,730 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-19 07:08:15,920 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:15,920 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:15,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:15,920 INFO L85 PathProgramCache]: Analyzing trace with hash -289016624, now seen corresponding path program 5 times [2022-11-19 07:08:15,920 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:15,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1278940778] [2022-11-19 07:08:15,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:15,921 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:15,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:16,095 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 23 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:16,095 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:16,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1278940778] [2022-11-19 07:08:16,095 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1278940778] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:16,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1122725530] [2022-11-19 07:08:16,096 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:08:16,096 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:16,096 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:16,097 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:16,115 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-19 07:08:16,158 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-19 07:08:16,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:08:16,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-19 07:08:16,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:16,331 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 32 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:16,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:16,432 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 32 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:16,433 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1122725530] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:16,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1759753731] [2022-11-19 07:08:16,435 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:08:16,435 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:16,436 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:16,436 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:16,436 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:16,609 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:17,001 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1528#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:08:17,001 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:17,002 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:17,002 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2022-11-19 07:08:17,002 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [233942126] [2022-11-19 07:08:17,002 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:17,003 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-19 07:08:17,003 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:17,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-19 07:08:17,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=631, Unknown=0, NotChecked=0, Total=756 [2022-11-19 07:08:17,004 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:17,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:17,182 INFO L93 Difference]: Finished difference Result 75 states and 83 transitions. [2022-11-19 07:08:17,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-19 07:08:17,182 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2022-11-19 07:08:17,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:17,183 INFO L225 Difference]: With dead ends: 75 [2022-11-19 07:08:17,183 INFO L226 Difference]: Without dead ends: 52 [2022-11-19 07:08:17,184 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 78 SyntacticMatches, 8 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 370 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056 [2022-11-19 07:08:17,184 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 36 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:17,185 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 103 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:08:17,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-11-19 07:08:17,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 37. [2022-11-19 07:08:17,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:17,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2022-11-19 07:08:17,191 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 34 [2022-11-19 07:08:17,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:17,192 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2022-11-19 07:08:17,192 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:17,192 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2022-11-19 07:08:17,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-19 07:08:17,193 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:17,193 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:17,204 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-11-19 07:08:17,399 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:17,399 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:17,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:17,400 INFO L85 PathProgramCache]: Analyzing trace with hash 1842565365, now seen corresponding path program 6 times [2022-11-19 07:08:17,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:17,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1586214942] [2022-11-19 07:08:17,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:17,400 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:17,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:17,581 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 20 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:17,581 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:17,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1586214942] [2022-11-19 07:08:17,581 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1586214942] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:17,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1723734594] [2022-11-19 07:08:17,582 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:08:17,582 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:17,582 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:17,583 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:17,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-19 07:08:17,657 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:08:17,657 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:08:17,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-19 07:08:17,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:17,734 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 30 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:17,734 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:17,835 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 30 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:17,835 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1723734594] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:17,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1662737788] [2022-11-19 07:08:17,838 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:08:17,838 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:17,838 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:17,838 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:17,839 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:17,989 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:18,382 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1928#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:08:18,382 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:18,382 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:18,383 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 11 [2022-11-19 07:08:18,383 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1420665298] [2022-11-19 07:08:18,383 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:18,383 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-19 07:08:18,383 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:18,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-19 07:08:18,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=332, Unknown=0, NotChecked=0, Total=420 [2022-11-19 07:08:18,384 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:18,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:18,552 INFO L93 Difference]: Finished difference Result 54 states and 57 transitions. [2022-11-19 07:08:18,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-19 07:08:18,553 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 states have internal predecessors, (57), 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 36 [2022-11-19 07:08:18,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:18,554 INFO L225 Difference]: With dead ends: 54 [2022-11-19 07:08:18,554 INFO L226 Difference]: Without dead ends: 52 [2022-11-19 07:08:18,554 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 91 SyntacticMatches, 8 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=181, Invalid=631, Unknown=0, NotChecked=0, Total=812 [2022-11-19 07:08:18,555 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 51 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:18,555 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 72 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:08:18,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-11-19 07:08:18,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 45. [2022-11-19 07:08:18,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 44 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:18,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2022-11-19 07:08:18,563 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 36 [2022-11-19 07:08:18,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:18,563 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2022-11-19 07:08:18,564 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:18,564 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2022-11-19 07:08:18,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-19 07:08:18,565 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:18,565 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:18,575 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-11-19 07:08:18,770 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:18,771 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:18,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:18,771 INFO L85 PathProgramCache]: Analyzing trace with hash -590488101, now seen corresponding path program 7 times [2022-11-19 07:08:18,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:18,772 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1112419114] [2022-11-19 07:08:18,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:18,772 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:18,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:18,999 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 57 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:18,999 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:18,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1112419114] [2022-11-19 07:08:18,999 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1112419114] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:19,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1833583891] [2022-11-19 07:08:19,000 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:08:19,000 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:19,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:19,001 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:19,031 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-19 07:08:19,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:19,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-19 07:08:19,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:19,274 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 70 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:08:19,274 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:19,416 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 70 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:08:19,416 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1833583891] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:19,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1474135853] [2022-11-19 07:08:19,418 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:08:19,418 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:19,419 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:19,419 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:19,419 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:19,599 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:20,015 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2376#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:08:20,016 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:20,016 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:20,016 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 23 [2022-11-19 07:08:20,016 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409746729] [2022-11-19 07:08:20,016 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:20,017 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-19 07:08:20,017 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:20,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-19 07:08:20,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=829, Unknown=0, NotChecked=0, Total=992 [2022-11-19 07:08:20,018 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 23 states, 23 states have (on average 3.3043478260869565) internal successors, (76), 23 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:20,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:20,240 INFO L93 Difference]: Finished difference Result 94 states and 103 transitions. [2022-11-19 07:08:20,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-19 07:08:20,240 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.3043478260869565) internal successors, (76), 23 states have internal predecessors, (76), 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 44 [2022-11-19 07:08:20,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:20,241 INFO L225 Difference]: With dead ends: 94 [2022-11-19 07:08:20,241 INFO L226 Difference]: Without dead ends: 65 [2022-11-19 07:08:20,242 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 105 SyntacticMatches, 10 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 513 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=249, Invalid=1157, Unknown=0, NotChecked=0, Total=1406 [2022-11-19 07:08:20,243 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 44 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:20,243 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 105 Invalid, 150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:08:20,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-11-19 07:08:20,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 47. [2022-11-19 07:08:20,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.065217391304348) internal successors, (49), 46 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:20,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2022-11-19 07:08:20,257 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 44 [2022-11-19 07:08:20,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:20,257 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2022-11-19 07:08:20,258 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 3.3043478260869565) internal successors, (76), 23 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:20,258 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2022-11-19 07:08:20,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-19 07:08:20,261 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:20,262 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:20,277 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-19 07:08:20,477 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-19 07:08:20,477 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:20,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:20,478 INFO L85 PathProgramCache]: Analyzing trace with hash 1692798912, now seen corresponding path program 8 times [2022-11-19 07:08:20,478 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:20,478 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [342979702] [2022-11-19 07:08:20,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:20,478 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:20,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:20,792 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 57 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:20,793 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:20,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [342979702] [2022-11-19 07:08:20,793 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [342979702] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:20,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1621603432] [2022-11-19 07:08:20,793 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:08:20,794 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:20,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:20,795 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:20,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-19 07:08:20,866 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-19 07:08:20,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:08:20,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-19 07:08:20,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:21,118 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 72 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:21,118 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:21,300 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 72 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:21,300 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1621603432] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:21,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1332037910] [2022-11-19 07:08:21,302 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:08:21,302 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:21,302 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:21,303 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:21,303 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:21,439 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:21,866 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2894#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:08:21,867 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:21,867 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:21,867 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2022-11-19 07:08:21,867 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688338645] [2022-11-19 07:08:21,867 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:21,868 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-19 07:08:21,868 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:21,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-19 07:08:21,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=933, Unknown=0, NotChecked=0, Total=1122 [2022-11-19 07:08:21,870 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand has 25 states, 25 states have (on average 3.12) internal successors, (78), 25 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:22,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:22,114 INFO L93 Difference]: Finished difference Result 101 states and 111 transitions. [2022-11-19 07:08:22,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-19 07:08:22,115 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.12) internal successors, (78), 25 states have internal predecessors, (78), 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 46 [2022-11-19 07:08:22,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:22,116 INFO L225 Difference]: With dead ends: 101 [2022-11-19 07:08:22,116 INFO L226 Difference]: Without dead ends: 70 [2022-11-19 07:08:22,117 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 108 SyntacticMatches, 12 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 604 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=303, Invalid=1337, Unknown=0, NotChecked=0, Total=1640 [2022-11-19 07:08:22,118 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 56 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 193 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:22,118 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 115 Invalid, 193 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:08:22,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-11-19 07:08:22,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 49. [2022-11-19 07:08:22,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.0625) internal successors, (51), 48 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:22,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2022-11-19 07:08:22,125 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 46 [2022-11-19 07:08:22,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:22,126 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2022-11-19 07:08:22,126 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 3.12) internal successors, (78), 25 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:22,126 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2022-11-19 07:08:22,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-19 07:08:22,127 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:22,127 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:22,138 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-19 07:08:22,333 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-19 07:08:22,333 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:22,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:22,333 INFO L85 PathProgramCache]: Analyzing trace with hash 1203330149, now seen corresponding path program 9 times [2022-11-19 07:08:22,333 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:22,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197752022] [2022-11-19 07:08:22,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:22,334 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:22,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:22,547 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 42 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:22,547 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:22,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1197752022] [2022-11-19 07:08:22,547 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1197752022] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:22,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1613061699] [2022-11-19 07:08:22,548 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:08:22,548 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:22,548 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:22,549 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:22,575 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-19 07:08:22,619 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:08:22,620 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:08:22,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-19 07:08:22,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:22,711 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 56 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:22,711 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:22,858 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 56 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:22,858 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1613061699] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:22,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [820086563] [2022-11-19 07:08:22,860 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:08:22,860 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:22,861 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:22,861 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:22,861 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:23,028 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:23,375 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3428#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:08:23,375 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:23,375 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:23,376 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 13 [2022-11-19 07:08:23,376 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1259109359] [2022-11-19 07:08:23,376 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:23,376 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-19 07:08:23,377 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:23,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-19 07:08:23,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=399, Unknown=0, NotChecked=0, Total=506 [2022-11-19 07:08:23,378 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand has 14 states, 14 states have (on average 4.928571428571429) internal successors, (69), 13 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:23,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:23,561 INFO L93 Difference]: Finished difference Result 66 states and 69 transitions. [2022-11-19 07:08:23,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-19 07:08:23,561 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.928571428571429) internal successors, (69), 13 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2022-11-19 07:08:23,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:23,562 INFO L225 Difference]: With dead ends: 66 [2022-11-19 07:08:23,562 INFO L226 Difference]: Without dead ends: 64 [2022-11-19 07:08:23,563 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 125 SyntacticMatches, 12 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 364 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=242, Invalid=814, Unknown=0, NotChecked=0, Total=1056 [2022-11-19 07:08:23,564 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 78 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:23,564 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [78 Valid, 103 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:08:23,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-11-19 07:08:23,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 57. [2022-11-19 07:08:23,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:23,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2022-11-19 07:08:23,572 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 48 [2022-11-19 07:08:23,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:23,573 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2022-11-19 07:08:23,573 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.928571428571429) internal successors, (69), 13 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:23,573 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2022-11-19 07:08:23,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-19 07:08:23,574 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:23,574 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:23,580 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-19 07:08:23,779 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:23,779 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:23,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:23,779 INFO L85 PathProgramCache]: Analyzing trace with hash 1063876939, now seen corresponding path program 10 times [2022-11-19 07:08:23,779 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:23,780 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [762097135] [2022-11-19 07:08:23,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:23,780 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:23,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:24,107 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 107 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:24,107 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:24,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [762097135] [2022-11-19 07:08:24,107 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [762097135] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:24,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [491585933] [2022-11-19 07:08:24,108 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:08:24,108 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:24,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:24,109 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:24,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-19 07:08:24,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:24,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-19 07:08:24,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:24,475 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 126 proven. 56 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:08:24,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:24,673 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 126 proven. 56 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:08:24,673 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [491585933] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:24,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1789894807] [2022-11-19 07:08:24,675 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:08:24,675 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:24,675 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:24,676 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:24,676 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:24,793 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:25,306 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3994#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:08:25,306 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:25,306 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:25,306 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 29 [2022-11-19 07:08:25,307 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028889227] [2022-11-19 07:08:25,307 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:25,307 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-19 07:08:25,307 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:25,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-19 07:08:25,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=1169, Unknown=0, NotChecked=0, Total=1406 [2022-11-19 07:08:25,309 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand has 29 states, 29 states have (on average 3.310344827586207) internal successors, (96), 29 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:25,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:25,601 INFO L93 Difference]: Finished difference Result 120 states and 131 transitions. [2022-11-19 07:08:25,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-19 07:08:25,601 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 3.310344827586207) internal successors, (96), 29 states have internal predecessors, (96), 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 56 [2022-11-19 07:08:25,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:25,602 INFO L225 Difference]: With dead ends: 120 [2022-11-19 07:08:25,603 INFO L226 Difference]: Without dead ends: 83 [2022-11-19 07:08:25,605 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 135 SyntacticMatches, 14 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 779 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=383, Invalid=1687, Unknown=0, NotChecked=0, Total=2070 [2022-11-19 07:08:25,606 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 57 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:25,606 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [57 Valid, 138 Invalid, 204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:08:25,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-11-19 07:08:25,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 59. [2022-11-19 07:08:25,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 58 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) [2022-11-19 07:08:25,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2022-11-19 07:08:25,622 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 56 [2022-11-19 07:08:25,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:25,622 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2022-11-19 07:08:25,623 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 3.310344827586207) internal successors, (96), 29 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:25,623 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2022-11-19 07:08:25,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-19 07:08:25,624 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:25,625 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:25,630 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-19 07:08:25,830 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:25,830 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:25,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:25,831 INFO L85 PathProgramCache]: Analyzing trace with hash -755696720, now seen corresponding path program 11 times [2022-11-19 07:08:25,831 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:25,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [309816474] [2022-11-19 07:08:25,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:25,831 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:25,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:26,187 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 107 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:26,188 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:26,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [309816474] [2022-11-19 07:08:26,188 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [309816474] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:26,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2069486074] [2022-11-19 07:08:26,188 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:08:26,188 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:26,188 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:26,190 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:26,195 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-19 07:08:26,267 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-19 07:08:26,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:08:26,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-19 07:08:26,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:26,600 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 128 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:26,600 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:26,841 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 128 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:26,842 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2069486074] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:26,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [678131816] [2022-11-19 07:08:26,843 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:08:26,844 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:26,844 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:26,844 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:26,844 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:26,957 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:27,390 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4650#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:08:27,390 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:27,390 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:27,390 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 31 [2022-11-19 07:08:27,390 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383883616] [2022-11-19 07:08:27,390 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:27,391 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-19 07:08:27,391 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:27,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-19 07:08:27,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=1291, Unknown=0, NotChecked=0, Total=1560 [2022-11-19 07:08:27,391 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand has 31 states, 31 states have (on average 3.161290322580645) internal successors, (98), 31 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:27,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:27,702 INFO L93 Difference]: Finished difference Result 127 states and 139 transitions. [2022-11-19 07:08:27,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-19 07:08:27,702 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 3.161290322580645) internal successors, (98), 31 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2022-11-19 07:08:27,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:27,703 INFO L225 Difference]: With dead ends: 127 [2022-11-19 07:08:27,703 INFO L226 Difference]: Without dead ends: 88 [2022-11-19 07:08:27,704 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 138 SyntacticMatches, 16 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 886 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=451, Invalid=1901, Unknown=0, NotChecked=0, Total=2352 [2022-11-19 07:08:27,705 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 97 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 178 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 155 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 178 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:27,705 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [97 Valid, 155 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 178 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:08:27,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-19 07:08:27,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 61. [2022-11-19 07:08:27,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.05) internal successors, (63), 60 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:27,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2022-11-19 07:08:27,714 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 58 [2022-11-19 07:08:27,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:27,714 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2022-11-19 07:08:27,715 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 3.161290322580645) internal successors, (98), 31 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:27,715 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2022-11-19 07:08:27,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-19 07:08:27,716 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:27,716 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:27,721 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-19 07:08:27,921 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-19 07:08:27,921 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:27,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:27,922 INFO L85 PathProgramCache]: Analyzing trace with hash -1314293547, now seen corresponding path program 12 times [2022-11-19 07:08:27,922 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:27,922 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141639726] [2022-11-19 07:08:27,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:27,922 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:27,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:28,198 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 72 proven. 146 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:28,198 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:28,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141639726] [2022-11-19 07:08:28,198 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [141639726] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:28,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [581698541] [2022-11-19 07:08:28,199 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:08:28,199 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:28,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:28,200 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:28,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-19 07:08:28,279 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:08:28,279 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:08:28,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-19 07:08:28,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:28,378 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 90 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:28,378 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:28,546 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 90 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:28,546 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [581698541] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:28,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2043456350] [2022-11-19 07:08:28,548 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:08:28,548 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:28,549 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:28,549 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:28,549 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:28,656 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:29,025 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5318#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:08:29,025 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:29,025 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:29,026 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 15 [2022-11-19 07:08:29,026 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923543029] [2022-11-19 07:08:29,026 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:29,026 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-19 07:08:29,026 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:29,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-19 07:08:29,027 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=470, Unknown=0, NotChecked=0, Total=600 [2022-11-19 07:08:29,027 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 16 states, 16 states have (on average 5.0625) internal successors, (81), 15 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:29,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:29,241 INFO L93 Difference]: Finished difference Result 78 states and 81 transitions. [2022-11-19 07:08:29,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-19 07:08:29,242 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 5.0625) internal successors, (81), 15 states have internal predecessors, (81), 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 60 [2022-11-19 07:08:29,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:29,243 INFO L225 Difference]: With dead ends: 78 [2022-11-19 07:08:29,243 INFO L226 Difference]: Without dead ends: 76 [2022-11-19 07:08:29,244 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 159 SyntacticMatches, 16 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 488 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=315, Invalid=1017, Unknown=0, NotChecked=0, Total=1332 [2022-11-19 07:08:29,244 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 75 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:29,245 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 99 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:08:29,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-11-19 07:08:29,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 69. [2022-11-19 07:08:29,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 68 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:29,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2022-11-19 07:08:29,264 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 60 [2022-11-19 07:08:29,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:29,264 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2022-11-19 07:08:29,264 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 5.0625) internal successors, (81), 15 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:29,264 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2022-11-19 07:08:29,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-19 07:08:29,265 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:29,265 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:29,271 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-19 07:08:29,465 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-19 07:08:29,465 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:29,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:29,466 INFO L85 PathProgramCache]: Analyzing trace with hash 325985723, now seen corresponding path program 13 times [2022-11-19 07:08:29,466 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:29,466 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [789607122] [2022-11-19 07:08:29,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:29,466 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:29,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:29,856 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 173 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:29,857 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:29,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [789607122] [2022-11-19 07:08:29,857 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [789607122] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:29,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [894155984] [2022-11-19 07:08:29,858 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:08:29,858 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:29,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:29,863 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:29,871 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-19 07:08:29,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:29,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-19 07:08:29,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:30,325 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 198 proven. 90 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:08:30,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:30,589 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 198 proven. 90 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:08:30,589 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [894155984] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:30,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2098871537] [2022-11-19 07:08:30,591 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:08:30,591 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:30,591 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:30,592 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:30,592 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:30,722 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:31,178 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6002#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:08:31,178 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:31,178 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:31,179 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 35 [2022-11-19 07:08:31,179 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050233405] [2022-11-19 07:08:31,179 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:31,179 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-19 07:08:31,180 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:31,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-19 07:08:31,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=1565, Unknown=0, NotChecked=0, Total=1892 [2022-11-19 07:08:31,181 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 35 states, 35 states have (on average 3.3142857142857145) internal successors, (116), 35 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:31,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:31,491 INFO L93 Difference]: Finished difference Result 146 states and 159 transitions. [2022-11-19 07:08:31,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-19 07:08:31,491 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.3142857142857145) internal successors, (116), 35 states have internal predecessors, (116), 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 68 [2022-11-19 07:08:31,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:31,492 INFO L225 Difference]: With dead ends: 146 [2022-11-19 07:08:31,492 INFO L226 Difference]: Without dead ends: 101 [2022-11-19 07:08:31,493 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 165 SyntacticMatches, 18 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1093 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=549, Invalid=2313, Unknown=0, NotChecked=0, Total=2862 [2022-11-19 07:08:31,494 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 67 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:31,494 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 168 Invalid, 230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:08:31,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-11-19 07:08:31,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 71. [2022-11-19 07:08:31,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:31,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2022-11-19 07:08:31,503 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 68 [2022-11-19 07:08:31,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:31,504 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2022-11-19 07:08:31,504 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.3142857142857145) internal successors, (116), 35 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:31,504 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2022-11-19 07:08:31,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-11-19 07:08:31,505 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:31,505 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:31,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-19 07:08:31,711 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:31,711 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:31,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:31,712 INFO L85 PathProgramCache]: Analyzing trace with hash 1366833312, now seen corresponding path program 14 times [2022-11-19 07:08:31,712 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:31,712 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1057980267] [2022-11-19 07:08:31,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:31,712 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:31,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:32,159 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 173 proven. 137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:32,159 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:32,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1057980267] [2022-11-19 07:08:32,160 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1057980267] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:32,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2077335511] [2022-11-19 07:08:32,160 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:08:32,160 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:32,160 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:32,161 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:32,186 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-19 07:08:32,249 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2022-11-19 07:08:32,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:08:32,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-19 07:08:32,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:32,685 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 200 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:32,685 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:33,004 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 200 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:33,005 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2077335511] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:33,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [458011211] [2022-11-19 07:08:33,006 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:08:33,007 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:33,007 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:33,007 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:33,007 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:33,151 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:33,628 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6796#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:08:33,628 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:33,628 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:33,629 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 37 [2022-11-19 07:08:33,629 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297664901] [2022-11-19 07:08:33,629 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:33,629 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-19 07:08:33,629 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:33,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-19 07:08:33,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=365, Invalid=1705, Unknown=0, NotChecked=0, Total=2070 [2022-11-19 07:08:33,631 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 37 states, 37 states have (on average 3.189189189189189) internal successors, (118), 37 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:34,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:34,014 INFO L93 Difference]: Finished difference Result 153 states and 167 transitions. [2022-11-19 07:08:34,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-19 07:08:34,015 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.189189189189189) internal successors, (118), 37 states have internal predecessors, (118), 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 70 [2022-11-19 07:08:34,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:34,015 INFO L225 Difference]: With dead ends: 153 [2022-11-19 07:08:34,016 INFO L226 Difference]: Without dead ends: 106 [2022-11-19 07:08:34,017 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 168 SyntacticMatches, 20 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1216 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=631, Invalid=2561, Unknown=0, NotChecked=0, Total=3192 [2022-11-19 07:08:34,017 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 88 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 241 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 329 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:34,018 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 219 Invalid, 329 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 241 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:08:34,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-11-19 07:08:34,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 73. [2022-11-19 07:08:34,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 72 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:34,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2022-11-19 07:08:34,027 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 70 [2022-11-19 07:08:34,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:34,027 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2022-11-19 07:08:34,028 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 3.189189189189189) internal successors, (118), 37 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:34,028 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2022-11-19 07:08:34,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2022-11-19 07:08:34,029 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:34,029 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:34,047 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-19 07:08:34,234 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-19 07:08:34,235 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:34,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:34,235 INFO L85 PathProgramCache]: Analyzing trace with hash 893986373, now seen corresponding path program 15 times [2022-11-19 07:08:34,235 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:34,235 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941330029] [2022-11-19 07:08:34,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:34,236 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:34,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:34,595 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 110 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:34,596 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:34,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941330029] [2022-11-19 07:08:34,596 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [941330029] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:34,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [988024071] [2022-11-19 07:08:34,596 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:08:34,596 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:34,596 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:34,599 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:34,623 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-19 07:08:34,680 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:08:34,680 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:08:34,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-19 07:08:34,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:34,836 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 132 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:34,836 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:35,086 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 132 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:35,086 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [988024071] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:35,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1672234706] [2022-11-19 07:08:35,088 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:08:35,088 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:35,088 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:35,089 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:35,089 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:35,216 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:35,596 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7598#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:08:35,596 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:35,596 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:35,596 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 17 [2022-11-19 07:08:35,596 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872653738] [2022-11-19 07:08:35,596 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:35,597 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-19 07:08:35,597 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:35,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-19 07:08:35,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=545, Unknown=0, NotChecked=0, Total=702 [2022-11-19 07:08:35,598 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand has 18 states, 18 states have (on average 5.166666666666667) internal successors, (93), 17 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:35,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:35,867 INFO L93 Difference]: Finished difference Result 90 states and 93 transitions. [2022-11-19 07:08:35,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-19 07:08:35,868 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 5.166666666666667) internal successors, (93), 17 states have internal predecessors, (93), 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 72 [2022-11-19 07:08:35,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:35,868 INFO L225 Difference]: With dead ends: 90 [2022-11-19 07:08:35,868 INFO L226 Difference]: Without dead ends: 88 [2022-11-19 07:08:35,869 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 193 SyntacticMatches, 20 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 628 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=400, Invalid=1240, Unknown=0, NotChecked=0, Total=1640 [2022-11-19 07:08:35,870 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 150 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:35,870 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [150 Valid, 119 Invalid, 139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:08:35,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-19 07:08:35,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 81. [2022-11-19 07:08:35,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 80 states have (on average 1.0375) internal successors, (83), 80 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:35,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 83 transitions. [2022-11-19 07:08:35,897 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 83 transitions. Word has length 72 [2022-11-19 07:08:35,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:35,898 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 83 transitions. [2022-11-19 07:08:35,898 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 5.166666666666667) internal successors, (93), 17 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:35,898 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 83 transitions. [2022-11-19 07:08:35,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-11-19 07:08:35,899 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:35,899 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:35,905 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-19 07:08:36,103 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-19 07:08:36,103 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:36,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:36,104 INFO L85 PathProgramCache]: Analyzing trace with hash -1526635733, now seen corresponding path program 16 times [2022-11-19 07:08:36,104 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:36,104 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1961330093] [2022-11-19 07:08:36,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:36,104 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:36,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:36,659 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 255 proven. 165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:36,660 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:36,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1961330093] [2022-11-19 07:08:36,660 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1961330093] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:36,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [224266983] [2022-11-19 07:08:36,660 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:08:36,660 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:36,661 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:36,662 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:36,666 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-19 07:08:36,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:36,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-19 07:08:36,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:37,268 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 286 proven. 132 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:08:37,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:37,629 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 286 proven. 132 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:08:37,629 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [224266983] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:37,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [798839584] [2022-11-19 07:08:37,630 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:08:37,631 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:37,631 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:37,631 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:37,631 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:37,746 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:38,231 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8400#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:08:38,231 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:38,231 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:38,231 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 41 [2022-11-19 07:08:38,231 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1323588909] [2022-11-19 07:08:38,231 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:38,234 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-11-19 07:08:38,234 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:38,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-11-19 07:08:38,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=433, Invalid=2017, Unknown=0, NotChecked=0, Total=2450 [2022-11-19 07:08:38,235 INFO L87 Difference]: Start difference. First operand 81 states and 83 transitions. Second operand has 41 states, 41 states have (on average 3.317073170731707) internal successors, (136), 41 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:38,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:38,676 INFO L93 Difference]: Finished difference Result 172 states and 187 transitions. [2022-11-19 07:08:38,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-19 07:08:38,676 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 3.317073170731707) internal successors, (136), 41 states have internal predecessors, (136), 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 80 [2022-11-19 07:08:38,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:38,677 INFO L225 Difference]: With dead ends: 172 [2022-11-19 07:08:38,677 INFO L226 Difference]: Without dead ends: 119 [2022-11-19 07:08:38,678 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 195 SyntacticMatches, 22 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1455 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=747, Invalid=3035, Unknown=0, NotChecked=0, Total=3782 [2022-11-19 07:08:38,679 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 86 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 299 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 365 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 299 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:38,679 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [86 Valid, 278 Invalid, 365 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 299 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:08:38,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2022-11-19 07:08:38,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 83. [2022-11-19 07:08:38,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 82 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:38,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2022-11-19 07:08:38,688 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 80 [2022-11-19 07:08:38,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:38,688 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2022-11-19 07:08:38,688 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 3.317073170731707) internal successors, (136), 41 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:38,688 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2022-11-19 07:08:38,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-11-19 07:08:38,689 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:38,689 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:38,694 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-19 07:08:38,891 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:38,891 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:38,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:38,891 INFO L85 PathProgramCache]: Analyzing trace with hash -1246411120, now seen corresponding path program 17 times [2022-11-19 07:08:38,891 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:38,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [605599025] [2022-11-19 07:08:38,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:38,892 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:38,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:39,443 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 255 proven. 189 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:39,443 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:39,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [605599025] [2022-11-19 07:08:39,443 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [605599025] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:39,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [13528560] [2022-11-19 07:08:39,443 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:08:39,443 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:39,443 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:39,445 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:39,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-19 07:08:39,535 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2022-11-19 07:08:39,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:08:39,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-19 07:08:39,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:40,103 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 288 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:40,103 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:40,479 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 288 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:40,479 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [13528560] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:40,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [940897453] [2022-11-19 07:08:40,480 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:08:40,481 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:40,481 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:40,481 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:40,481 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:40,604 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:41,125 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9332#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:08:41,125 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:41,125 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:41,126 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 43 [2022-11-19 07:08:41,126 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897338763] [2022-11-19 07:08:41,126 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:41,126 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-19 07:08:41,127 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:41,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-19 07:08:41,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=477, Invalid=2175, Unknown=0, NotChecked=0, Total=2652 [2022-11-19 07:08:41,128 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand has 43 states, 43 states have (on average 3.2093023255813953) internal successors, (138), 43 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:41,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:41,562 INFO L93 Difference]: Finished difference Result 179 states and 195 transitions. [2022-11-19 07:08:41,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-19 07:08:41,562 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 3.2093023255813953) internal successors, (138), 43 states have internal predecessors, (138), 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 82 [2022-11-19 07:08:41,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:41,563 INFO L225 Difference]: With dead ends: 179 [2022-11-19 07:08:41,563 INFO L226 Difference]: Without dead ends: 124 [2022-11-19 07:08:41,565 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 198 SyntacticMatches, 24 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1594 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=843, Invalid=3317, Unknown=0, NotChecked=0, Total=4160 [2022-11-19 07:08:41,565 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 92 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 274 SdHoareTripleChecker+Invalid, 361 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:41,566 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [92 Valid, 274 Invalid, 361 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 290 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:08:41,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-11-19 07:08:41,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 85. [2022-11-19 07:08:41,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 84 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:41,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2022-11-19 07:08:41,575 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 82 [2022-11-19 07:08:41,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:41,576 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2022-11-19 07:08:41,576 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 3.2093023255813953) internal successors, (138), 43 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:41,576 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2022-11-19 07:08:41,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-11-19 07:08:41,577 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:41,577 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:41,586 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-19 07:08:41,782 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:41,783 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:41,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:41,783 INFO L85 PathProgramCache]: Analyzing trace with hash 1761469621, now seen corresponding path program 18 times [2022-11-19 07:08:41,783 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:41,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2116456545] [2022-11-19 07:08:41,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:41,783 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:41,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:42,231 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 156 proven. 314 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:42,231 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:42,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2116456545] [2022-11-19 07:08:42,232 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2116456545] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:42,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2017738372] [2022-11-19 07:08:42,232 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:08:42,232 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:42,232 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:42,233 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:42,237 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-19 07:08:42,319 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:08:42,319 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:08:42,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-19 07:08:42,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:42,467 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 182 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:42,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:42,746 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 182 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:42,746 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2017738372] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:42,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [177837942] [2022-11-19 07:08:42,747 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:08:42,748 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:42,748 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:42,748 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:42,748 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:42,862 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:43,235 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10268#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:08:43,235 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:43,235 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:43,236 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 19 [2022-11-19 07:08:43,236 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605254204] [2022-11-19 07:08:43,236 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:43,236 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-19 07:08:43,236 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:43,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-19 07:08:43,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=624, Unknown=0, NotChecked=0, Total=812 [2022-11-19 07:08:43,238 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 20 states, 20 states have (on average 5.25) internal successors, (105), 19 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:43,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:43,525 INFO L93 Difference]: Finished difference Result 102 states and 105 transitions. [2022-11-19 07:08:43,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-19 07:08:43,526 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 5.25) internal successors, (105), 19 states have internal predecessors, (105), 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 [2022-11-19 07:08:43,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:43,527 INFO L225 Difference]: With dead ends: 102 [2022-11-19 07:08:43,527 INFO L226 Difference]: Without dead ends: 100 [2022-11-19 07:08:43,527 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 227 SyntacticMatches, 24 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 784 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=497, Invalid=1483, Unknown=0, NotChecked=0, Total=1980 [2022-11-19 07:08:43,528 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 123 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:43,528 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [123 Valid, 152 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:08:43,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2022-11-19 07:08:43,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 93. [2022-11-19 07:08:43,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.0326086956521738) internal successors, (95), 92 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:43,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2022-11-19 07:08:43,537 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 84 [2022-11-19 07:08:43,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:43,538 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2022-11-19 07:08:43,538 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 5.25) internal successors, (105), 19 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:43,538 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2022-11-19 07:08:43,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-11-19 07:08:43,539 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:43,539 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:43,549 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-19 07:08:43,744 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:43,745 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:43,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:43,745 INFO L85 PathProgramCache]: Analyzing trace with hash -1928810085, now seen corresponding path program 19 times [2022-11-19 07:08:43,745 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:43,745 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1066633229] [2022-11-19 07:08:43,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:43,745 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:43,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:44,398 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 353 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:44,399 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:44,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1066633229] [2022-11-19 07:08:44,399 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1066633229] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:44,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [429858227] [2022-11-19 07:08:44,399 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:08:44,399 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:44,399 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:44,400 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:44,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-19 07:08:44,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:44,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-19 07:08:44,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:45,065 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 390 proven. 182 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:08:45,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:45,496 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 390 proven. 182 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:08:45,497 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [429858227] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:45,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [655141049] [2022-11-19 07:08:45,498 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:08:45,499 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:45,499 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:45,499 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:45,499 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:45,616 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:46,182 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11188#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:08:46,182 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:46,182 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:46,182 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 47 [2022-11-19 07:08:46,182 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642253988] [2022-11-19 07:08:46,182 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:46,183 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-19 07:08:46,183 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:46,183 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-19 07:08:46,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=555, Invalid=2525, Unknown=0, NotChecked=0, Total=3080 [2022-11-19 07:08:46,185 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand has 47 states, 47 states have (on average 3.3191489361702127) internal successors, (156), 47 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:46,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:46,643 INFO L93 Difference]: Finished difference Result 198 states and 215 transitions. [2022-11-19 07:08:46,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-19 07:08:46,643 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 3.3191489361702127) internal successors, (156), 47 states have internal predecessors, (156), 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 92 [2022-11-19 07:08:46,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:46,644 INFO L225 Difference]: With dead ends: 198 [2022-11-19 07:08:46,644 INFO L226 Difference]: Without dead ends: 137 [2022-11-19 07:08:46,645 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 225 SyntacticMatches, 26 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1865 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=977, Invalid=3853, Unknown=0, NotChecked=0, Total=4830 [2022-11-19 07:08:46,645 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 118 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 249 SdHoareTripleChecker+Invalid, 355 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:46,646 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [118 Valid, 249 Invalid, 355 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 268 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:08:46,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2022-11-19 07:08:46,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 95. [2022-11-19 07:08:46,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.0319148936170213) internal successors, (97), 94 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:46,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2022-11-19 07:08:46,657 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 92 [2022-11-19 07:08:46,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:46,657 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2022-11-19 07:08:46,657 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 3.3191489361702127) internal successors, (156), 47 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:46,657 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2022-11-19 07:08:46,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-11-19 07:08:46,658 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:46,658 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:46,663 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-11-19 07:08:46,858 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:46,859 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:46,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:46,859 INFO L85 PathProgramCache]: Analyzing trace with hash 1907467648, now seen corresponding path program 20 times [2022-11-19 07:08:46,859 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:46,859 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [926051005] [2022-11-19 07:08:46,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:46,860 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:46,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:47,568 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 353 proven. 249 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:47,568 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:47,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [926051005] [2022-11-19 07:08:47,568 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [926051005] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:47,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [148561680] [2022-11-19 07:08:47,568 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:08:47,568 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:47,569 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:47,570 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:47,585 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-19 07:08:47,686 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2022-11-19 07:08:47,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:08:47,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-19 07:08:47,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:48,352 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 392 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:48,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:48,784 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 392 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:48,784 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [148561680] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:48,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [131587089] [2022-11-19 07:08:48,786 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:08:48,786 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:48,786 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:48,786 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:48,787 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:48,894 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:49,436 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12258#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:08:49,436 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:49,436 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:49,436 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 49 [2022-11-19 07:08:49,437 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971202541] [2022-11-19 07:08:49,437 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:49,437 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-11-19 07:08:49,437 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:49,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-11-19 07:08:49,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=605, Invalid=2701, Unknown=0, NotChecked=0, Total=3306 [2022-11-19 07:08:49,439 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand has 49 states, 49 states have (on average 3.2244897959183674) internal successors, (158), 49 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:50,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:50,034 INFO L93 Difference]: Finished difference Result 205 states and 223 transitions. [2022-11-19 07:08:50,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-19 07:08:50,034 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.2244897959183674) internal successors, (158), 49 states have internal predecessors, (158), 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 94 [2022-11-19 07:08:50,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:50,035 INFO L225 Difference]: With dead ends: 205 [2022-11-19 07:08:50,035 INFO L226 Difference]: Without dead ends: 142 [2022-11-19 07:08:50,036 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 228 SyntacticMatches, 28 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2020 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1087, Invalid=4169, Unknown=0, NotChecked=0, Total=5256 [2022-11-19 07:08:50,037 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 147 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 325 mSolverCounterSat, 165 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 300 SdHoareTripleChecker+Invalid, 490 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 165 IncrementalHoareTripleChecker+Valid, 325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:50,037 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [147 Valid, 300 Invalid, 490 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [165 Valid, 325 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:08:50,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2022-11-19 07:08:50,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 97. [2022-11-19 07:08:50,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 96 states have (on average 1.03125) internal successors, (99), 96 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:50,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 99 transitions. [2022-11-19 07:08:50,051 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 99 transitions. Word has length 94 [2022-11-19 07:08:50,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:50,052 INFO L495 AbstractCegarLoop]: Abstraction has 97 states and 99 transitions. [2022-11-19 07:08:50,052 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 3.2244897959183674) internal successors, (158), 49 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:50,052 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 99 transitions. [2022-11-19 07:08:50,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2022-11-19 07:08:50,052 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:50,052 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:50,057 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-11-19 07:08:50,253 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:50,253 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:50,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:50,254 INFO L85 PathProgramCache]: Analyzing trace with hash -806538203, now seen corresponding path program 21 times [2022-11-19 07:08:50,254 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:50,254 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1710639020] [2022-11-19 07:08:50,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:50,254 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:50,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:50,788 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 210 proven. 422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:50,788 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:50,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1710639020] [2022-11-19 07:08:50,789 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1710639020] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:50,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [494100528] [2022-11-19 07:08:50,789 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:08:50,789 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:50,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:50,791 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:50,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-19 07:08:50,889 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:08:50,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:08:50,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-19 07:08:50,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:51,042 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 240 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:51,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:51,410 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 240 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:51,410 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [494100528] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:51,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1969471137] [2022-11-19 07:08:51,411 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:08:51,411 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:51,412 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:51,412 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:51,412 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:51,519 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:51,922 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13328#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:08:51,922 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:51,923 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:51,923 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 21 [2022-11-19 07:08:51,923 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352939387] [2022-11-19 07:08:51,923 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:51,924 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-19 07:08:51,924 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:51,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-19 07:08:51,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=707, Unknown=0, NotChecked=0, Total=930 [2022-11-19 07:08:51,925 INFO L87 Difference]: Start difference. First operand 97 states and 99 transitions. Second operand has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 21 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:52,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:52,242 INFO L93 Difference]: Finished difference Result 114 states and 117 transitions. [2022-11-19 07:08:52,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-19 07:08:52,243 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 21 states have internal predecessors, (117), 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 96 [2022-11-19 07:08:52,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:52,243 INFO L225 Difference]: With dead ends: 114 [2022-11-19 07:08:52,243 INFO L226 Difference]: Without dead ends: 112 [2022-11-19 07:08:52,244 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 261 SyntacticMatches, 28 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 956 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=606, Invalid=1746, Unknown=0, NotChecked=0, Total=2352 [2022-11-19 07:08:52,244 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 201 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 201 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:52,245 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [201 Valid, 127 Invalid, 167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:08:52,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2022-11-19 07:08:52,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 105. [2022-11-19 07:08:52,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 104 states have (on average 1.0288461538461537) internal successors, (107), 104 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:52,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2022-11-19 07:08:52,255 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 96 [2022-11-19 07:08:52,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:52,256 INFO L495 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2022-11-19 07:08:52,256 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 21 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:52,256 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2022-11-19 07:08:52,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2022-11-19 07:08:52,257 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:52,257 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:52,263 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-19 07:08:52,463 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:52,463 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:52,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:52,464 INFO L85 PathProgramCache]: Analyzing trace with hash -1859546869, now seen corresponding path program 22 times [2022-11-19 07:08:52,464 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:52,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [707268129] [2022-11-19 07:08:52,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:52,464 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:52,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:53,299 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 467 proven. 285 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:53,300 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:53,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [707268129] [2022-11-19 07:08:53,300 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [707268129] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:53,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2089393266] [2022-11-19 07:08:53,300 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:08:53,300 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:53,301 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:53,303 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:53,327 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-19 07:08:53,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:53,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 389 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-19 07:08:53,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:54,192 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 510 proven. 240 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:08:54,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:54,673 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 510 proven. 240 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:08:54,674 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2089393266] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:54,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [482427483] [2022-11-19 07:08:54,675 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:08:54,675 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:54,675 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:54,676 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:54,676 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:54,786 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:55,359 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14366#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:08:55,360 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:55,360 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:55,360 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 53 [2022-11-19 07:08:55,360 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1277038362] [2022-11-19 07:08:55,360 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:55,361 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-11-19 07:08:55,361 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:55,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-11-19 07:08:55,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=693, Invalid=3089, Unknown=0, NotChecked=0, Total=3782 [2022-11-19 07:08:55,362 INFO L87 Difference]: Start difference. First operand 105 states and 107 transitions. Second operand has 53 states, 53 states have (on average 3.3207547169811322) internal successors, (176), 53 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:55,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:55,987 INFO L93 Difference]: Finished difference Result 224 states and 243 transitions. [2022-11-19 07:08:55,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-19 07:08:55,988 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 3.3207547169811322) internal successors, (176), 53 states have internal predecessors, (176), 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 104 [2022-11-19 07:08:55,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:55,988 INFO L225 Difference]: With dead ends: 224 [2022-11-19 07:08:55,989 INFO L226 Difference]: Without dead ends: 155 [2022-11-19 07:08:55,989 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 255 SyntacticMatches, 30 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2323 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1239, Invalid=4767, Unknown=0, NotChecked=0, Total=6006 [2022-11-19 07:08:55,990 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 129 mSDsluCounter, 329 mSDsCounter, 0 mSdLazyCounter, 386 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 363 SdHoareTripleChecker+Invalid, 478 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:55,990 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [129 Valid, 363 Invalid, 478 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 386 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:08:55,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2022-11-19 07:08:56,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 107. [2022-11-19 07:08:56,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 106 states have (on average 1.028301886792453) internal successors, (109), 106 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) [2022-11-19 07:08:56,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2022-11-19 07:08:56,001 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 104 [2022-11-19 07:08:56,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:56,002 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2022-11-19 07:08:56,002 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 3.3207547169811322) internal successors, (176), 53 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:56,002 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2022-11-19 07:08:56,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2022-11-19 07:08:56,003 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:56,003 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:56,008 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-11-19 07:08:56,208 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-11-19 07:08:56,209 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:08:56,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:08:56,209 INFO L85 PathProgramCache]: Analyzing trace with hash 1949488496, now seen corresponding path program 23 times [2022-11-19 07:08:56,209 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:08:56,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1953954010] [2022-11-19 07:08:56,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:08:56,209 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:08:56,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:08:57,032 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 467 proven. 317 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:57,032 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:08:57,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1953954010] [2022-11-19 07:08:57,032 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1953954010] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:08:57,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [213930465] [2022-11-19 07:08:57,033 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:08:57,033 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:08:57,033 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:08:57,034 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:08:57,051 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-19 07:08:57,154 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2022-11-19 07:08:57,154 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:08:57,157 INFO L263 TraceCheckSpWp]: Trace formula consists of 399 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-19 07:08:57,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:08:57,932 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 512 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:57,932 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:08:58,477 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 512 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:08:58,477 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [213930465] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:08:58,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [162405841] [2022-11-19 07:08:58,478 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:08:58,478 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:08:58,478 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:08:58,479 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:08:58,479 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:08:58,594 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:08:59,190 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15574#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:08:59,190 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:08:59,190 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:08:59,190 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 55 [2022-11-19 07:08:59,190 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472939503] [2022-11-19 07:08:59,191 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:08:59,191 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-11-19 07:08:59,191 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:08:59,192 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-11-19 07:08:59,192 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=749, Invalid=3283, Unknown=0, NotChecked=0, Total=4032 [2022-11-19 07:08:59,193 INFO L87 Difference]: Start difference. First operand 107 states and 109 transitions. Second operand has 55 states, 55 states have (on average 3.2363636363636363) internal successors, (178), 55 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:59,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:08:59,786 INFO L93 Difference]: Finished difference Result 231 states and 251 transitions. [2022-11-19 07:08:59,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-19 07:08:59,786 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.2363636363636363) internal successors, (178), 55 states have internal predecessors, (178), 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 106 [2022-11-19 07:08:59,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:08:59,788 INFO L225 Difference]: With dead ends: 231 [2022-11-19 07:08:59,788 INFO L226 Difference]: Without dead ends: 160 [2022-11-19 07:08:59,789 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 369 GetRequests, 258 SyntacticMatches, 32 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2494 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1363, Invalid=5117, Unknown=0, NotChecked=0, Total=6480 [2022-11-19 07:08:59,790 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 148 mSDsluCounter, 273 mSDsCounter, 0 mSdLazyCounter, 337 mSolverCounterSat, 139 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 476 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 139 IncrementalHoareTripleChecker+Valid, 337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:08:59,790 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [148 Valid, 309 Invalid, 476 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [139 Valid, 337 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:08:59,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2022-11-19 07:08:59,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 109. [2022-11-19 07:08:59,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 108 states have (on average 1.0277777777777777) internal successors, (111), 108 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:59,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2022-11-19 07:08:59,804 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 106 [2022-11-19 07:08:59,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:08:59,805 INFO L495 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2022-11-19 07:08:59,805 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 3.2363636363636363) internal successors, (178), 55 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:08:59,805 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2022-11-19 07:08:59,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2022-11-19 07:08:59,806 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:08:59,806 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 17, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:08:59,812 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-19 07:09:00,012 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-19 07:09:00,012 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:09:00,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:09:00,013 INFO L85 PathProgramCache]: Analyzing trace with hash -1174629227, now seen corresponding path program 24 times [2022-11-19 07:09:00,013 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:09:00,013 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [832376777] [2022-11-19 07:09:00,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:09:00,013 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:09:00,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:09:00,606 INFO L134 CoverageAnalysis]: Checked inductivity of 818 backedges. 272 proven. 546 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:00,607 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:09:00,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [832376777] [2022-11-19 07:09:00,607 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [832376777] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:09:00,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [188218466] [2022-11-19 07:09:00,607 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:09:00,607 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:00,607 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:09:00,608 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:09:00,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-19 07:09:00,707 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:09:00,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:09:00,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 409 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-19 07:09:00,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:09:00,866 INFO L134 CoverageAnalysis]: Checked inductivity of 818 backedges. 306 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:00,866 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:09:01,273 INFO L134 CoverageAnalysis]: Checked inductivity of 818 backedges. 306 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:01,274 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [188218466] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:09:01,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [690486407] [2022-11-19 07:09:01,275 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:09:01,275 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:09:01,275 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:09:01,275 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:09:01,276 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:09:01,386 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:09:01,776 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16778#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:09:01,776 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:09:01,776 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:09:01,777 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 23 [2022-11-19 07:09:01,777 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678612188] [2022-11-19 07:09:01,777 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:09:01,777 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-19 07:09:01,777 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:09:01,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-19 07:09:01,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=262, Invalid=794, Unknown=0, NotChecked=0, Total=1056 [2022-11-19 07:09:01,778 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 24 states, 24 states have (on average 5.375) internal successors, (129), 23 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:02,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:09:02,185 INFO L93 Difference]: Finished difference Result 126 states and 129 transitions. [2022-11-19 07:09:02,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-11-19 07:09:02,186 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 5.375) internal successors, (129), 23 states have internal predecessors, (129), 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 108 [2022-11-19 07:09:02,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:09:02,187 INFO L225 Difference]: With dead ends: 126 [2022-11-19 07:09:02,187 INFO L226 Difference]: Without dead ends: 124 [2022-11-19 07:09:02,187 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 295 SyntacticMatches, 32 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1144 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=727, Invalid=2029, Unknown=0, NotChecked=0, Total=2756 [2022-11-19 07:09:02,188 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 160 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:09:02,188 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [160 Valid, 180 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 193 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:09:02,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-11-19 07:09:02,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 117. [2022-11-19 07:09:02,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.0258620689655173) internal successors, (119), 116 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:02,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 119 transitions. [2022-11-19 07:09:02,210 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 119 transitions. Word has length 108 [2022-11-19 07:09:02,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:09:02,210 INFO L495 AbstractCegarLoop]: Abstraction has 117 states and 119 transitions. [2022-11-19 07:09:02,211 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 5.375) internal successors, (129), 23 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:02,211 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 119 transitions. [2022-11-19 07:09:02,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-11-19 07:09:02,211 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:09:02,211 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 18, 18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:09:02,216 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-19 07:09:02,412 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:02,412 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:09:02,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:09:02,412 INFO L85 PathProgramCache]: Analyzing trace with hash -2083946117, now seen corresponding path program 25 times [2022-11-19 07:09:02,412 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:09:02,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1030621338] [2022-11-19 07:09:02,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:09:02,413 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:09:02,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:09:03,415 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 597 proven. 357 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:03,416 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:09:03,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1030621338] [2022-11-19 07:09:03,416 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1030621338] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:09:03,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [686905647] [2022-11-19 07:09:03,416 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:09:03,416 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:03,417 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:09:03,419 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:09:03,451 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-19 07:09:03,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:09:03,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-19 07:09:03,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:09:04,388 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 646 proven. 306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:09:04,388 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:09:04,988 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 646 proven. 306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:09:04,989 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [686905647] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:09:04,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [80788775] [2022-11-19 07:09:04,991 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:09:04,991 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:09:04,991 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:09:04,992 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:09:04,992 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:09:05,100 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:09:05,733 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17934#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:09:05,733 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:09:05,733 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:09:05,734 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 59 [2022-11-19 07:09:05,734 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845623566] [2022-11-19 07:09:05,734 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:09:05,734 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-11-19 07:09:05,735 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:09:05,735 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-11-19 07:09:05,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=847, Invalid=3709, Unknown=0, NotChecked=0, Total=4556 [2022-11-19 07:09:05,735 INFO L87 Difference]: Start difference. First operand 117 states and 119 transitions. Second operand has 59 states, 59 states have (on average 3.3220338983050848) internal successors, (196), 59 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:06,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:09:06,397 INFO L93 Difference]: Finished difference Result 250 states and 271 transitions. [2022-11-19 07:09:06,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-19 07:09:06,397 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 3.3220338983050848) internal successors, (196), 59 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2022-11-19 07:09:06,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:09:06,399 INFO L225 Difference]: With dead ends: 250 [2022-11-19 07:09:06,399 INFO L226 Difference]: Without dead ends: 173 [2022-11-19 07:09:06,400 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 285 SyntacticMatches, 34 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2829 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1533, Invalid=5777, Unknown=0, NotChecked=0, Total=7310 [2022-11-19 07:09:06,400 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 135 mSDsluCounter, 387 mSDsCounter, 0 mSdLazyCounter, 448 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 425 SdHoareTripleChecker+Invalid, 547 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 448 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:09:06,401 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [135 Valid, 425 Invalid, 547 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 448 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:09:06,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2022-11-19 07:09:06,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 119. [2022-11-19 07:09:06,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 118 states have (on average 1.0254237288135593) internal successors, (121), 118 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:06,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2022-11-19 07:09:06,422 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 116 [2022-11-19 07:09:06,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:09:06,422 INFO L495 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2022-11-19 07:09:06,422 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 3.3220338983050848) internal successors, (196), 59 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:06,422 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2022-11-19 07:09:06,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2022-11-19 07:09:06,423 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:09:06,423 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:09:06,428 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-11-19 07:09:06,623 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-19 07:09:06,623 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:09:06,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:09:06,624 INFO L85 PathProgramCache]: Analyzing trace with hash 146691680, now seen corresponding path program 26 times [2022-11-19 07:09:06,624 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:09:06,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1806453406] [2022-11-19 07:09:06,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:09:06,624 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:09:06,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:09:07,608 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 597 proven. 393 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:07,608 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:09:07,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1806453406] [2022-11-19 07:09:07,608 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1806453406] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:09:07,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1170494874] [2022-11-19 07:09:07,609 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:09:07,609 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:07,609 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:09:07,610 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:09:07,612 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-19 07:09:07,730 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2022-11-19 07:09:07,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:09:07,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-19 07:09:07,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:09:08,627 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 648 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:08,627 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:09:09,267 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 648 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:09,267 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1170494874] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:09:09,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [561653787] [2022-11-19 07:09:09,268 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:09:09,269 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:09:09,269 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:09:09,269 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:09:09,269 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:09:09,389 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:09:10,001 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19280#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:09:10,001 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:09:10,001 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:09:10,001 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 61 [2022-11-19 07:09:10,001 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [868871172] [2022-11-19 07:09:10,001 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:09:10,002 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-11-19 07:09:10,002 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:09:10,002 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-11-19 07:09:10,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=909, Invalid=3921, Unknown=0, NotChecked=0, Total=4830 [2022-11-19 07:09:10,004 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand has 61 states, 61 states have (on average 3.2459016393442623) internal successors, (198), 61 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:10,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:09:10,731 INFO L93 Difference]: Finished difference Result 257 states and 279 transitions. [2022-11-19 07:09:10,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-19 07:09:10,732 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 3.2459016393442623) internal successors, (198), 61 states have internal predecessors, (198), 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 118 [2022-11-19 07:09:10,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:09:10,733 INFO L225 Difference]: With dead ends: 257 [2022-11-19 07:09:10,733 INFO L226 Difference]: Without dead ends: 178 [2022-11-19 07:09:10,734 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 288 SyntacticMatches, 36 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3016 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1671, Invalid=6161, Unknown=0, NotChecked=0, Total=7832 [2022-11-19 07:09:10,735 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 131 mSDsluCounter, 374 mSDsCounter, 0 mSdLazyCounter, 426 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 414 SdHoareTripleChecker+Invalid, 545 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 426 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:09:10,735 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [131 Valid, 414 Invalid, 545 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 426 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:09:10,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2022-11-19 07:09:10,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 121. [2022-11-19 07:09:10,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 120 states have (on average 1.025) internal successors, (123), 120 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:10,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 123 transitions. [2022-11-19 07:09:10,751 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 123 transitions. Word has length 118 [2022-11-19 07:09:10,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:09:10,752 INFO L495 AbstractCegarLoop]: Abstraction has 121 states and 123 transitions. [2022-11-19 07:09:10,752 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 3.2459016393442623) internal successors, (198), 61 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:10,752 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 123 transitions. [2022-11-19 07:09:10,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2022-11-19 07:09:10,753 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:09:10,753 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:09:10,764 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-19 07:09:10,959 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-19 07:09:10,959 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:09:10,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:09:10,959 INFO L85 PathProgramCache]: Analyzing trace with hash 600933893, now seen corresponding path program 27 times [2022-11-19 07:09:10,959 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:09:10,959 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [382595933] [2022-11-19 07:09:10,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:09:10,960 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:09:10,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:09:11,676 INFO L134 CoverageAnalysis]: Checked inductivity of 1028 backedges. 342 proven. 686 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:11,676 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:09:11,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [382595933] [2022-11-19 07:09:11,677 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [382595933] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:09:11,677 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [64467672] [2022-11-19 07:09:11,677 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:09:11,677 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:11,677 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:09:11,679 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:09:11,680 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-19 07:09:11,777 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:09:11,777 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:09:11,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 453 conjuncts, 44 conjunts are in the unsatisfiable core [2022-11-19 07:09:11,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:09:11,972 INFO L134 CoverageAnalysis]: Checked inductivity of 1028 backedges. 380 proven. 648 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:11,973 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:09:12,484 INFO L134 CoverageAnalysis]: Checked inductivity of 1028 backedges. 380 proven. 648 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:12,484 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [64467672] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:09:12,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2075896568] [2022-11-19 07:09:12,486 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:09:12,486 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:09:12,486 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:09:12,486 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:09:12,486 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:09:12,620 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:09:13,024 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20618#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:09:13,024 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:09:13,024 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:09:13,025 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 25 [2022-11-19 07:09:13,025 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [679907379] [2022-11-19 07:09:13,025 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:09:13,025 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-19 07:09:13,025 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:09:13,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-19 07:09:13,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=885, Unknown=0, NotChecked=0, Total=1190 [2022-11-19 07:09:13,026 INFO L87 Difference]: Start difference. First operand 121 states and 123 transitions. Second operand has 26 states, 26 states have (on average 5.423076923076923) internal successors, (141), 25 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:13,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:09:13,427 INFO L93 Difference]: Finished difference Result 138 states and 141 transitions. [2022-11-19 07:09:13,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-19 07:09:13,427 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 5.423076923076923) internal successors, (141), 25 states have internal predecessors, (141), 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 120 [2022-11-19 07:09:13,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:09:13,428 INFO L225 Difference]: With dead ends: 138 [2022-11-19 07:09:13,428 INFO L226 Difference]: Without dead ends: 136 [2022-11-19 07:09:13,429 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 420 GetRequests, 329 SyntacticMatches, 36 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1348 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=860, Invalid=2332, Unknown=0, NotChecked=0, Total=3192 [2022-11-19 07:09:13,430 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 199 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 180 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 199 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:09:13,430 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [199 Valid, 153 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 180 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:09:13,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2022-11-19 07:09:13,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 129. [2022-11-19 07:09:13,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 128 states have (on average 1.0234375) internal successors, (131), 128 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:13,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 131 transitions. [2022-11-19 07:09:13,448 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 131 transitions. Word has length 120 [2022-11-19 07:09:13,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:09:13,449 INFO L495 AbstractCegarLoop]: Abstraction has 129 states and 131 transitions. [2022-11-19 07:09:13,449 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 5.423076923076923) internal successors, (141), 25 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:13,449 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 131 transitions. [2022-11-19 07:09:13,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2022-11-19 07:09:13,450 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:09:13,450 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:09:13,456 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-19 07:09:13,656 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:13,656 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:09:13,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:09:13,656 INFO L85 PathProgramCache]: Analyzing trace with hash 604898027, now seen corresponding path program 28 times [2022-11-19 07:09:13,656 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:09:13,656 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [24498298] [2022-11-19 07:09:13,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:09:13,657 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:09:13,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:09:14,812 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 743 proven. 437 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:14,812 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:09:14,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [24498298] [2022-11-19 07:09:14,812 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [24498298] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:09:14,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1908549574] [2022-11-19 07:09:14,813 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:09:14,813 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:14,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:09:14,814 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:09:14,816 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-19 07:09:14,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:09:14,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 477 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-19 07:09:14,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:09:15,944 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 798 proven. 380 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:09:15,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:09:16,648 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 798 proven. 380 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:09:16,648 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1908549574] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:09:16,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [180239949] [2022-11-19 07:09:16,650 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:09:16,650 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:09:16,650 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:09:16,651 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:09:16,651 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:09:16,763 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:09:17,386 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21892#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:09:17,387 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:09:17,387 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:09:17,387 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 65 [2022-11-19 07:09:17,387 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406003294] [2022-11-19 07:09:17,387 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:09:17,387 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-11-19 07:09:17,387 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:09:17,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-11-19 07:09:17,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1017, Invalid=4385, Unknown=0, NotChecked=0, Total=5402 [2022-11-19 07:09:17,389 INFO L87 Difference]: Start difference. First operand 129 states and 131 transitions. Second operand has 65 states, 65 states have (on average 3.3230769230769233) internal successors, (216), 65 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:18,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:09:18,225 INFO L93 Difference]: Finished difference Result 276 states and 299 transitions. [2022-11-19 07:09:18,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-11-19 07:09:18,226 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 3.3230769230769233) internal successors, (216), 65 states have internal predecessors, (216), 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 128 [2022-11-19 07:09:18,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:09:18,227 INFO L225 Difference]: With dead ends: 276 [2022-11-19 07:09:18,227 INFO L226 Difference]: Without dead ends: 191 [2022-11-19 07:09:18,228 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 315 SyntacticMatches, 38 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3383 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1859, Invalid=6883, Unknown=0, NotChecked=0, Total=8742 [2022-11-19 07:09:18,229 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 143 mSDsluCounter, 422 mSDsCounter, 0 mSdLazyCounter, 485 mSolverCounterSat, 108 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 464 SdHoareTripleChecker+Invalid, 593 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 108 IncrementalHoareTripleChecker+Valid, 485 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:09:18,229 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [143 Valid, 464 Invalid, 593 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [108 Valid, 485 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:09:18,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2022-11-19 07:09:18,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 131. [2022-11-19 07:09:18,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.023076923076923) internal successors, (133), 130 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:18,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 133 transitions. [2022-11-19 07:09:18,248 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 133 transitions. Word has length 128 [2022-11-19 07:09:18,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:09:18,248 INFO L495 AbstractCegarLoop]: Abstraction has 131 states and 133 transitions. [2022-11-19 07:09:18,248 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 3.3230769230769233) internal successors, (216), 65 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:18,249 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 133 transitions. [2022-11-19 07:09:18,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2022-11-19 07:09:18,249 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:09:18,250 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:09:18,255 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-19 07:09:18,455 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2022-11-19 07:09:18,455 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:09:18,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:09:18,456 INFO L85 PathProgramCache]: Analyzing trace with hash -1214666672, now seen corresponding path program 29 times [2022-11-19 07:09:18,456 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:09:18,456 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [584119214] [2022-11-19 07:09:18,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:09:18,456 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:09:18,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:09:19,674 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 743 proven. 477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:19,674 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:09:19,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [584119214] [2022-11-19 07:09:19,674 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [584119214] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:09:19,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1129159031] [2022-11-19 07:09:19,675 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:09:19,675 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:19,675 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:09:19,676 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:09:19,703 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-19 07:09:19,827 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2022-11-19 07:09:19,827 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:09:19,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 487 conjuncts, 44 conjunts are in the unsatisfiable core [2022-11-19 07:09:19,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:09:20,947 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 800 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:20,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:09:21,699 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 800 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:21,699 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1129159031] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:09:21,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [793006018] [2022-11-19 07:09:21,700 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:09:21,700 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:09:21,700 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:09:21,701 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:09:21,701 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:09:21,794 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:09:22,434 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23376#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:09:22,434 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:09:22,434 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:09:22,434 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 67 [2022-11-19 07:09:22,435 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703455662] [2022-11-19 07:09:22,435 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:09:22,435 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-11-19 07:09:22,435 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:09:22,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-11-19 07:09:22,437 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1085, Invalid=4615, Unknown=0, NotChecked=0, Total=5700 [2022-11-19 07:09:22,437 INFO L87 Difference]: Start difference. First operand 131 states and 133 transitions. Second operand has 67 states, 67 states have (on average 3.253731343283582) internal successors, (218), 67 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:23,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:09:23,210 INFO L93 Difference]: Finished difference Result 283 states and 307 transitions. [2022-11-19 07:09:23,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-19 07:09:23,211 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 3.253731343283582) internal successors, (218), 67 states have internal predecessors, (218), 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 130 [2022-11-19 07:09:23,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:09:23,212 INFO L225 Difference]: With dead ends: 283 [2022-11-19 07:09:23,212 INFO L226 Difference]: Without dead ends: 196 [2022-11-19 07:09:23,214 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 318 SyntacticMatches, 40 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3586 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2011, Invalid=7301, Unknown=0, NotChecked=0, Total=9312 [2022-11-19 07:09:23,214 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 148 mSDsluCounter, 350 mSDsCounter, 0 mSdLazyCounter, 408 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 394 SdHoareTripleChecker+Invalid, 519 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 408 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:09:23,214 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [148 Valid, 394 Invalid, 519 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 408 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:09:23,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2022-11-19 07:09:23,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 133. [2022-11-19 07:09:23,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.0227272727272727) internal successors, (135), 132 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:23,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2022-11-19 07:09:23,234 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 130 [2022-11-19 07:09:23,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:09:23,234 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2022-11-19 07:09:23,234 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 3.253731343283582) internal successors, (218), 67 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:23,234 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2022-11-19 07:09:23,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2022-11-19 07:09:23,235 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:09:23,235 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 21, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:09:23,244 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-19 07:09:23,435 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:23,436 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:09:23,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:09:23,436 INFO L85 PathProgramCache]: Analyzing trace with hash -1764652939, now seen corresponding path program 30 times [2022-11-19 07:09:23,436 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:09:23,436 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2143945425] [2022-11-19 07:09:23,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:09:23,436 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:09:23,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:09:24,274 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 420 proven. 842 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:24,274 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:09:24,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2143945425] [2022-11-19 07:09:24,274 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2143945425] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:09:24,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [125627820] [2022-11-19 07:09:24,274 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:09:24,274 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:24,274 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:09:24,275 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:09:24,277 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-19 07:09:24,380 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:09:24,380 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:09:24,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 497 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-19 07:09:24,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:09:24,597 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 462 proven. 800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:24,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:09:25,225 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 462 proven. 800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:25,226 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [125627820] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:09:25,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1382680981] [2022-11-19 07:09:25,227 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:09:25,227 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:09:25,227 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:09:25,227 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:09:25,227 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:09:25,326 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:09:25,758 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24848#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:09:25,759 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:09:25,759 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:09:25,759 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 27 [2022-11-19 07:09:25,759 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [6576467] [2022-11-19 07:09:25,759 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:09:25,760 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-19 07:09:25,760 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:09:25,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-19 07:09:25,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=352, Invalid=980, Unknown=0, NotChecked=0, Total=1332 [2022-11-19 07:09:25,761 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand has 28 states, 28 states have (on average 5.464285714285714) internal successors, (153), 27 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:26,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:09:26,224 INFO L93 Difference]: Finished difference Result 150 states and 153 transitions. [2022-11-19 07:09:26,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-19 07:09:26,224 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 5.464285714285714) internal successors, (153), 27 states have internal predecessors, (153), 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 132 [2022-11-19 07:09:26,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:09:26,225 INFO L225 Difference]: With dead ends: 150 [2022-11-19 07:09:26,225 INFO L226 Difference]: Without dead ends: 148 [2022-11-19 07:09:26,226 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 363 SyntacticMatches, 40 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1568 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1005, Invalid=2655, Unknown=0, NotChecked=0, Total=3660 [2022-11-19 07:09:26,226 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 218 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 196 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:09:26,227 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [218 Valid, 196 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 215 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:09:26,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2022-11-19 07:09:26,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 141. [2022-11-19 07:09:26,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 140 states have (on average 1.0214285714285714) internal successors, (143), 140 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:26,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 143 transitions. [2022-11-19 07:09:26,243 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 143 transitions. Word has length 132 [2022-11-19 07:09:26,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:09:26,243 INFO L495 AbstractCegarLoop]: Abstraction has 141 states and 143 transitions. [2022-11-19 07:09:26,244 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 5.464285714285714) internal successors, (153), 27 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:26,244 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 143 transitions. [2022-11-19 07:09:26,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2022-11-19 07:09:26,244 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:09:26,244 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 22, 22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:09:26,249 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2022-11-19 07:09:26,445 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:26,445 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:09:26,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:09:26,445 INFO L85 PathProgramCache]: Analyzing trace with hash -35875493, now seen corresponding path program 31 times [2022-11-19 07:09:26,445 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:09:26,445 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [309565151] [2022-11-19 07:09:26,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:09:26,446 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:09:26,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:09:27,808 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 905 proven. 525 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:27,808 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:09:27,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [309565151] [2022-11-19 07:09:27,808 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [309565151] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:09:27,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [836986223] [2022-11-19 07:09:27,808 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:09:27,808 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:27,809 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:09:27,809 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:09:27,812 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-19 07:09:27,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:09:27,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 521 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-19 07:09:27,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:09:29,056 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 966 proven. 462 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:09:29,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:09:29,869 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 966 proven. 462 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:09:29,869 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [836986223] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:09:29,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2042613004] [2022-11-19 07:09:29,870 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:09:29,870 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:09:29,871 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:09:29,871 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:09:29,871 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:09:29,961 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:09:30,618 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26240#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:09:30,618 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:09:30,618 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:09:30,618 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 71 [2022-11-19 07:09:30,619 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054491527] [2022-11-19 07:09:30,619 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:09:30,619 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2022-11-19 07:09:30,619 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:09:30,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2022-11-19 07:09:30,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1203, Invalid=5117, Unknown=0, NotChecked=0, Total=6320 [2022-11-19 07:09:30,621 INFO L87 Difference]: Start difference. First operand 141 states and 143 transitions. Second operand has 71 states, 71 states have (on average 3.323943661971831) internal successors, (236), 71 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:31,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:09:31,506 INFO L93 Difference]: Finished difference Result 302 states and 327 transitions. [2022-11-19 07:09:31,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-19 07:09:31,507 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 3.323943661971831) internal successors, (236), 71 states have internal predecessors, (236), 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 140 [2022-11-19 07:09:31,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:09:31,508 INFO L225 Difference]: With dead ends: 302 [2022-11-19 07:09:31,508 INFO L226 Difference]: Without dead ends: 209 [2022-11-19 07:09:31,509 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 345 SyntacticMatches, 42 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3985 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=2217, Invalid=8085, Unknown=0, NotChecked=0, Total=10302 [2022-11-19 07:09:31,515 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 223 mSDsluCounter, 390 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 173 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 436 SdHoareTripleChecker+Invalid, 635 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 173 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:09:31,517 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [223 Valid, 436 Invalid, 635 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [173 Valid, 462 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:09:31,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2022-11-19 07:09:31,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 143. [2022-11-19 07:09:31,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.0211267605633803) internal successors, (145), 142 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:31,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2022-11-19 07:09:31,539 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 140 [2022-11-19 07:09:31,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:09:31,540 INFO L495 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2022-11-19 07:09:31,540 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 3.323943661971831) internal successors, (236), 71 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:31,540 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2022-11-19 07:09:31,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2022-11-19 07:09:31,541 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:09:31,541 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:09:31,547 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-11-19 07:09:31,746 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:31,747 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:09:31,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:09:31,747 INFO L85 PathProgramCache]: Analyzing trace with hash 634014528, now seen corresponding path program 32 times [2022-11-19 07:09:31,747 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:09:31,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1344722033] [2022-11-19 07:09:31,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:09:31,747 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:09:31,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:09:33,201 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 905 proven. 569 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:33,202 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:09:33,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1344722033] [2022-11-19 07:09:33,202 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1344722033] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:09:33,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1931777522] [2022-11-19 07:09:33,202 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:09:33,202 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:33,203 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:09:33,204 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:09:33,206 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-19 07:09:33,347 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2022-11-19 07:09:33,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:09:33,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-19 07:09:33,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:09:34,638 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 968 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:34,639 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:09:35,524 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 968 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:35,524 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1931777522] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:09:35,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1576780183] [2022-11-19 07:09:35,526 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:09:35,526 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:09:35,526 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:09:35,526 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:09:35,526 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:09:35,648 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:09:36,312 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27862#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:09:36,312 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:09:36,313 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:09:36,313 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 73 [2022-11-19 07:09:36,313 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1722604904] [2022-11-19 07:09:36,313 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:09:36,313 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-11-19 07:09:36,313 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:09:36,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-11-19 07:09:36,314 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1277, Invalid=5365, Unknown=0, NotChecked=0, Total=6642 [2022-11-19 07:09:36,314 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand has 73 states, 73 states have (on average 3.26027397260274) internal successors, (238), 73 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:37,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:09:37,256 INFO L93 Difference]: Finished difference Result 309 states and 335 transitions. [2022-11-19 07:09:37,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-11-19 07:09:37,257 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 3.26027397260274) internal successors, (238), 73 states have internal predecessors, (238), 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 142 [2022-11-19 07:09:37,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:09:37,258 INFO L225 Difference]: With dead ends: 309 [2022-11-19 07:09:37,258 INFO L226 Difference]: Without dead ends: 214 [2022-11-19 07:09:37,259 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 348 SyntacticMatches, 44 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4204 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=2383, Invalid=8537, Unknown=0, NotChecked=0, Total=10920 [2022-11-19 07:09:37,260 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 179 mSDsluCounter, 429 mSDsCounter, 0 mSdLazyCounter, 496 mSolverCounterSat, 177 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 179 SdHoareTripleChecker+Valid, 477 SdHoareTripleChecker+Invalid, 673 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 177 IncrementalHoareTripleChecker+Valid, 496 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:09:37,260 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [179 Valid, 477 Invalid, 673 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [177 Valid, 496 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:09:37,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2022-11-19 07:09:37,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 145. [2022-11-19 07:09:37,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 144 states have (on average 1.0208333333333333) internal successors, (147), 144 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:37,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 147 transitions. [2022-11-19 07:09:37,279 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 147 transitions. Word has length 142 [2022-11-19 07:09:37,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:09:37,279 INFO L495 AbstractCegarLoop]: Abstraction has 145 states and 147 transitions. [2022-11-19 07:09:37,279 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 3.26027397260274) internal successors, (238), 73 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:37,279 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 147 transitions. [2022-11-19 07:09:37,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2022-11-19 07:09:37,280 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:09:37,280 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 23, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:09:37,285 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-11-19 07:09:37,480 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:37,481 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:09:37,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:09:37,481 INFO L85 PathProgramCache]: Analyzing trace with hash 153230309, now seen corresponding path program 33 times [2022-11-19 07:09:37,481 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:09:37,481 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323069508] [2022-11-19 07:09:37,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:09:37,481 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:09:37,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:09:38,332 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 506 proven. 1014 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:38,332 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:09:38,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [323069508] [2022-11-19 07:09:38,332 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [323069508] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:09:38,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [105516733] [2022-11-19 07:09:38,332 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:09:38,332 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:38,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:09:38,334 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:09:38,362 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-19 07:09:38,459 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:09:38,459 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:09:38,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 541 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-19 07:09:38,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:09:38,708 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 552 proven. 968 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:38,708 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:09:39,335 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 552 proven. 968 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:39,336 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [105516733] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:09:39,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [240205004] [2022-11-19 07:09:39,337 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:09:39,337 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:09:39,337 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:09:39,338 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:09:39,338 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:09:39,455 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:09:39,885 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29468#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:09:39,885 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:09:39,886 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:09:39,886 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 29 [2022-11-19 07:09:39,886 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652910871] [2022-11-19 07:09:39,886 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:09:39,886 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-19 07:09:39,887 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:09:39,887 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-19 07:09:39,887 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=403, Invalid=1079, Unknown=0, NotChecked=0, Total=1482 [2022-11-19 07:09:39,888 INFO L87 Difference]: Start difference. First operand 145 states and 147 transitions. Second operand has 30 states, 30 states have (on average 5.5) internal successors, (165), 29 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:40,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:09:40,412 INFO L93 Difference]: Finished difference Result 162 states and 165 transitions. [2022-11-19 07:09:40,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-11-19 07:09:40,412 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 5.5) internal successors, (165), 29 states have internal predecessors, (165), 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 144 [2022-11-19 07:09:40,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:09:40,415 INFO L225 Difference]: With dead ends: 162 [2022-11-19 07:09:40,415 INFO L226 Difference]: Without dead ends: 160 [2022-11-19 07:09:40,416 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 397 SyntacticMatches, 44 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1804 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1162, Invalid=2998, Unknown=0, NotChecked=0, Total=4160 [2022-11-19 07:09:40,416 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 235 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 235 SdHoareTripleChecker+Valid, 188 SdHoareTripleChecker+Invalid, 250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:09:40,416 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [235 Valid, 188 Invalid, 250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 221 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:09:40,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2022-11-19 07:09:40,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 153. [2022-11-19 07:09:40,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.019736842105263) internal successors, (155), 152 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:40,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 155 transitions. [2022-11-19 07:09:40,434 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 155 transitions. Word has length 144 [2022-11-19 07:09:40,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:09:40,434 INFO L495 AbstractCegarLoop]: Abstraction has 153 states and 155 transitions. [2022-11-19 07:09:40,434 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 5.5) internal successors, (165), 29 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:40,434 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 155 transitions. [2022-11-19 07:09:40,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2022-11-19 07:09:40,435 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:09:40,435 INFO L195 NwaCegarLoop]: trace histogram [25, 24, 24, 24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:09:40,441 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-11-19 07:09:40,641 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-11-19 07:09:40,641 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:09:40,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:09:40,641 INFO L85 PathProgramCache]: Analyzing trace with hash 1239070923, now seen corresponding path program 34 times [2022-11-19 07:09:40,642 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:09:40,642 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1829407459] [2022-11-19 07:09:40,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:09:40,642 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:09:40,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:09:42,027 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 1083 proven. 621 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:42,027 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:09:42,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1829407459] [2022-11-19 07:09:42,027 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1829407459] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:09:42,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1346620613] [2022-11-19 07:09:42,028 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:09:42,028 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:42,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:09:42,029 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:09:42,031 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-11-19 07:09:42,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:09:42,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 565 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-19 07:09:42,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:09:43,452 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 1150 proven. 552 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:09:43,452 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:09:44,425 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 1150 proven. 552 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:09:44,426 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1346620613] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:09:44,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1260905960] [2022-11-19 07:09:44,427 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:09:44,427 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:09:44,427 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:09:44,427 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:09:44,427 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:09:44,530 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:09:45,218 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30978#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:09:45,219 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:09:45,219 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:09:45,219 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 50] total 77 [2022-11-19 07:09:45,219 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656838568] [2022-11-19 07:09:45,219 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:09:45,220 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2022-11-19 07:09:45,220 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:09:45,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2022-11-19 07:09:45,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1405, Invalid=5905, Unknown=0, NotChecked=0, Total=7310 [2022-11-19 07:09:45,222 INFO L87 Difference]: Start difference. First operand 153 states and 155 transitions. Second operand has 77 states, 77 states have (on average 3.324675324675325) internal successors, (256), 77 states have internal predecessors, (256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:46,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:09:46,282 INFO L93 Difference]: Finished difference Result 328 states and 355 transitions. [2022-11-19 07:09:46,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-19 07:09:46,283 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 3.324675324675325) internal successors, (256), 77 states have internal predecessors, (256), 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 152 [2022-11-19 07:09:46,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:09:46,284 INFO L225 Difference]: With dead ends: 328 [2022-11-19 07:09:46,284 INFO L226 Difference]: Without dead ends: 227 [2022-11-19 07:09:46,285 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 529 GetRequests, 375 SyntacticMatches, 46 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4635 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=2607, Invalid=9383, Unknown=0, NotChecked=0, Total=11990 [2022-11-19 07:09:46,286 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 167 mSDsluCounter, 591 mSDsCounter, 0 mSdLazyCounter, 666 mSolverCounterSat, 98 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 641 SdHoareTripleChecker+Invalid, 764 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 666 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:09:46,286 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [167 Valid, 641 Invalid, 764 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [98 Valid, 666 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:09:46,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2022-11-19 07:09:46,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 155. [2022-11-19 07:09:46,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 154 states have (on average 1.0194805194805194) internal successors, (157), 154 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:46,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 157 transitions. [2022-11-19 07:09:46,310 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 157 transitions. Word has length 152 [2022-11-19 07:09:46,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:09:46,310 INFO L495 AbstractCegarLoop]: Abstraction has 155 states and 157 transitions. [2022-11-19 07:09:46,310 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 3.324675324675325) internal successors, (256), 77 states have internal predecessors, (256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:46,310 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 157 transitions. [2022-11-19 07:09:46,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2022-11-19 07:09:46,311 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:09:46,311 INFO L195 NwaCegarLoop]: trace histogram [25, 25, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:09:46,321 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-11-19 07:09:46,517 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-11-19 07:09:46,517 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:09:46,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:09:46,517 INFO L85 PathProgramCache]: Analyzing trace with hash -183124176, now seen corresponding path program 35 times [2022-11-19 07:09:46,517 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:09:46,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1731263633] [2022-11-19 07:09:46,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:09:46,518 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:09:46,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:09:47,937 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 1083 proven. 669 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:47,937 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:09:47,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1731263633] [2022-11-19 07:09:47,938 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1731263633] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:09:47,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [306007491] [2022-11-19 07:09:47,938 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:09:47,938 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:47,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:09:47,939 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:09:47,941 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-19 07:09:48,097 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2022-11-19 07:09:48,097 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:09:48,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 575 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-19 07:09:48,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:09:49,532 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 1152 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:49,533 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:09:50,575 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 1152 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:50,575 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [306007491] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:09:50,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1748571127] [2022-11-19 07:09:50,576 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:09:50,576 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:09:50,576 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:09:50,576 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:09:50,576 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:09:50,670 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:09:51,384 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32738#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:09:51,384 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:09:51,384 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:09:51,384 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 79 [2022-11-19 07:09:51,384 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097212252] [2022-11-19 07:09:51,384 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:09:51,385 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-11-19 07:09:51,385 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:09:51,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-11-19 07:09:51,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=6171, Unknown=0, NotChecked=0, Total=7656 [2022-11-19 07:09:51,386 INFO L87 Difference]: Start difference. First operand 155 states and 157 transitions. Second operand has 79 states, 79 states have (on average 3.2658227848101267) internal successors, (258), 79 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:52,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:09:52,455 INFO L93 Difference]: Finished difference Result 335 states and 363 transitions. [2022-11-19 07:09:52,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-11-19 07:09:52,455 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 3.2658227848101267) internal successors, (258), 79 states have internal predecessors, (258), 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 154 [2022-11-19 07:09:52,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:09:52,456 INFO L225 Difference]: With dead ends: 335 [2022-11-19 07:09:52,457 INFO L226 Difference]: Without dead ends: 232 [2022-11-19 07:09:52,458 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 537 GetRequests, 378 SyntacticMatches, 48 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4870 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=2787, Invalid=9869, Unknown=0, NotChecked=0, Total=12656 [2022-11-19 07:09:52,459 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 214 mSDsluCounter, 429 mSDsCounter, 0 mSdLazyCounter, 518 mSolverCounterSat, 228 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 214 SdHoareTripleChecker+Valid, 481 SdHoareTripleChecker+Invalid, 746 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 228 IncrementalHoareTripleChecker+Valid, 518 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:09:52,459 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [214 Valid, 481 Invalid, 746 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [228 Valid, 518 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:09:52,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2022-11-19 07:09:52,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 157. [2022-11-19 07:09:52,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 156 states have (on average 1.0192307692307692) internal successors, (159), 156 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:52,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2022-11-19 07:09:52,476 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 154 [2022-11-19 07:09:52,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:09:52,477 INFO L495 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2022-11-19 07:09:52,477 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 3.2658227848101267) internal successors, (258), 79 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:52,477 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2022-11-19 07:09:52,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2022-11-19 07:09:52,478 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:09:52,478 INFO L195 NwaCegarLoop]: trace histogram [26, 25, 25, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:09:52,483 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-11-19 07:09:52,678 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:52,678 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:09:52,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:09:52,679 INFO L85 PathProgramCache]: Analyzing trace with hash -1113014187, now seen corresponding path program 36 times [2022-11-19 07:09:52,679 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:09:52,679 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1198434391] [2022-11-19 07:09:52,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:09:52,679 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:09:52,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:09:53,487 INFO L134 CoverageAnalysis]: Checked inductivity of 1802 backedges. 600 proven. 1202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:53,487 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:09:53,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1198434391] [2022-11-19 07:09:53,488 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1198434391] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:09:53,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [761246710] [2022-11-19 07:09:53,488 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:09:53,488 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:53,488 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:09:53,491 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:09:53,496 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-19 07:09:53,613 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:09:53,613 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:09:53,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 585 conjuncts, 56 conjunts are in the unsatisfiable core [2022-11-19 07:09:53,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:09:53,821 INFO L134 CoverageAnalysis]: Checked inductivity of 1802 backedges. 650 proven. 1152 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:53,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:09:54,543 INFO L134 CoverageAnalysis]: Checked inductivity of 1802 backedges. 650 proven. 1152 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:54,543 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [761246710] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:09:54,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [321178537] [2022-11-19 07:09:54,544 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:09:54,544 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:09:54,544 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:09:54,545 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:09:54,545 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:09:54,656 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:09:55,104 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34478#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:09:55,105 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:09:55,105 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:09:55,105 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 31 [2022-11-19 07:09:55,105 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948056122] [2022-11-19 07:09:55,105 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:09:55,105 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-19 07:09:55,105 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:09:55,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-19 07:09:55,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=458, Invalid=1182, Unknown=0, NotChecked=0, Total=1640 [2022-11-19 07:09:55,106 INFO L87 Difference]: Start difference. First operand 157 states and 159 transitions. Second operand has 32 states, 32 states have (on average 5.53125) internal successors, (177), 31 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:55,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:09:55,660 INFO L93 Difference]: Finished difference Result 174 states and 177 transitions. [2022-11-19 07:09:55,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2022-11-19 07:09:55,662 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 5.53125) internal successors, (177), 31 states have internal predecessors, (177), 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 156 [2022-11-19 07:09:55,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:09:55,663 INFO L225 Difference]: With dead ends: 174 [2022-11-19 07:09:55,663 INFO L226 Difference]: Without dead ends: 172 [2022-11-19 07:09:55,663 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 546 GetRequests, 431 SyntacticMatches, 48 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2056 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1331, Invalid=3361, Unknown=0, NotChecked=0, Total=4692 [2022-11-19 07:09:55,664 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 309 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 227 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 309 SdHoareTripleChecker+Valid, 190 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:09:55,664 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [309 Valid, 190 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 227 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:09:55,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2022-11-19 07:09:55,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 165. [2022-11-19 07:09:55,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 164 states have (on average 1.0182926829268293) internal successors, (167), 164 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:55,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 167 transitions. [2022-11-19 07:09:55,691 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 167 transitions. Word has length 156 [2022-11-19 07:09:55,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:09:55,691 INFO L495 AbstractCegarLoop]: Abstraction has 165 states and 167 transitions. [2022-11-19 07:09:55,691 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 5.53125) internal successors, (177), 31 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:09:55,692 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 167 transitions. [2022-11-19 07:09:55,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2022-11-19 07:09:55,692 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:09:55,693 INFO L195 NwaCegarLoop]: trace histogram [27, 26, 26, 26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:09:55,703 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-11-19 07:09:55,898 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-11-19 07:09:55,899 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:09:55,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:09:55,900 INFO L85 PathProgramCache]: Analyzing trace with hash -848433861, now seen corresponding path program 37 times [2022-11-19 07:09:55,900 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:09:55,900 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [509559604] [2022-11-19 07:09:55,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:09:55,901 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:09:55,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:09:57,423 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 1277 proven. 725 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:09:57,424 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:09:57,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [509559604] [2022-11-19 07:09:57,424 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [509559604] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:09:57,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1246735596] [2022-11-19 07:09:57,424 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:09:57,424 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:09:57,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:09:57,425 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:09:57,427 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-11-19 07:09:57,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:09:57,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 609 conjuncts, 54 conjunts are in the unsatisfiable core [2022-11-19 07:09:57,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:09:59,142 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 1350 proven. 650 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:09:59,142 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:10:00,239 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 1350 proven. 650 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:10:00,239 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1246735596] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:10:00,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [961455409] [2022-11-19 07:10:00,240 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:10:00,240 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:10:00,241 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:10:00,241 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:10:00,241 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:10:00,328 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:10:01,072 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36106#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:10:01,072 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:10:01,072 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:10:01,073 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54, 54] total 83 [2022-11-19 07:10:01,073 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [327813041] [2022-11-19 07:10:01,073 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:10:01,073 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2022-11-19 07:10:01,073 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:10:01,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2022-11-19 07:10:01,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1623, Invalid=6749, Unknown=0, NotChecked=0, Total=8372 [2022-11-19 07:10:01,075 INFO L87 Difference]: Start difference. First operand 165 states and 167 transitions. Second operand has 83 states, 83 states have (on average 3.325301204819277) internal successors, (276), 83 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:02,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:10:02,235 INFO L93 Difference]: Finished difference Result 354 states and 383 transitions. [2022-11-19 07:10:02,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-11-19 07:10:02,236 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 3.325301204819277) internal successors, (276), 83 states have internal predecessors, (276), 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 164 [2022-11-19 07:10:02,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:10:02,237 INFO L225 Difference]: With dead ends: 354 [2022-11-19 07:10:02,237 INFO L226 Difference]: Without dead ends: 245 [2022-11-19 07:10:02,239 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 571 GetRequests, 405 SyntacticMatches, 50 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5333 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=3029, Invalid=10777, Unknown=0, NotChecked=0, Total=13806 [2022-11-19 07:10:02,240 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 213 mSDsluCounter, 505 mSDsCounter, 0 mSdLazyCounter, 595 mSolverCounterSat, 257 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 559 SdHoareTripleChecker+Invalid, 852 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 257 IncrementalHoareTripleChecker+Valid, 595 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:10:02,240 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [213 Valid, 559 Invalid, 852 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [257 Valid, 595 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:10:02,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2022-11-19 07:10:02,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 167. [2022-11-19 07:10:02,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 166 states have (on average 1.0180722891566265) internal successors, (169), 166 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:02,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 169 transitions. [2022-11-19 07:10:02,278 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 169 transitions. Word has length 164 [2022-11-19 07:10:02,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:10:02,278 INFO L495 AbstractCegarLoop]: Abstraction has 167 states and 169 transitions. [2022-11-19 07:10:02,278 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 3.325301204819277) internal successors, (276), 83 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:02,279 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 169 transitions. [2022-11-19 07:10:02,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2022-11-19 07:10:02,280 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:10:02,280 INFO L195 NwaCegarLoop]: trace histogram [27, 27, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:10:02,291 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-11-19 07:10:02,486 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-11-19 07:10:02,486 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:10:02,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:10:02,486 INFO L85 PathProgramCache]: Analyzing trace with hash -1543404512, now seen corresponding path program 38 times [2022-11-19 07:10:02,486 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:10:02,487 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1842645599] [2022-11-19 07:10:02,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:10:02,487 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:10:02,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:10:03,973 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 1277 proven. 777 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:10:03,974 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:10:03,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1842645599] [2022-11-19 07:10:03,974 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1842645599] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:10:03,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1465794941] [2022-11-19 07:10:03,974 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:10:03,974 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:10:03,974 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:10:03,975 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:10:03,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-11-19 07:10:04,148 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2022-11-19 07:10:04,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:10:04,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 619 conjuncts, 56 conjunts are in the unsatisfiable core [2022-11-19 07:10:04,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:10:05,748 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 1352 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:10:05,748 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:10:06,915 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 1352 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:10:06,916 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1465794941] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:10:06,916 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1679528479] [2022-11-19 07:10:06,917 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:10:06,917 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:10:06,917 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:10:06,917 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:10:06,917 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:10:07,023 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:10:07,768 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38004#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:10:07,768 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:10:07,768 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:10:07,769 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 85 [2022-11-19 07:10:07,769 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456038920] [2022-11-19 07:10:07,769 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:10:07,769 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2022-11-19 07:10:07,770 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:10:07,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2022-11-19 07:10:07,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1709, Invalid=7033, Unknown=0, NotChecked=0, Total=8742 [2022-11-19 07:10:07,771 INFO L87 Difference]: Start difference. First operand 167 states and 169 transitions. Second operand has 85 states, 85 states have (on average 3.2705882352941176) internal successors, (278), 85 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:09,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:10:09,005 INFO L93 Difference]: Finished difference Result 361 states and 391 transitions. [2022-11-19 07:10:09,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-11-19 07:10:09,006 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 85 states have (on average 3.2705882352941176) internal successors, (278), 85 states have internal predecessors, (278), 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 166 [2022-11-19 07:10:09,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:10:09,007 INFO L225 Difference]: With dead ends: 361 [2022-11-19 07:10:09,007 INFO L226 Difference]: Without dead ends: 250 [2022-11-19 07:10:09,008 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 579 GetRequests, 408 SyntacticMatches, 52 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5584 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=3223, Invalid=11297, Unknown=0, NotChecked=0, Total=14520 [2022-11-19 07:10:09,009 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 252 mSDsluCounter, 484 mSDsCounter, 0 mSdLazyCounter, 570 mSolverCounterSat, 257 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 252 SdHoareTripleChecker+Valid, 540 SdHoareTripleChecker+Invalid, 827 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 257 IncrementalHoareTripleChecker+Valid, 570 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:10:09,009 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [252 Valid, 540 Invalid, 827 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [257 Valid, 570 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:10:09,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2022-11-19 07:10:09,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 169. [2022-11-19 07:10:09,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 168 states have (on average 1.0178571428571428) internal successors, (171), 168 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:09,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 171 transitions. [2022-11-19 07:10:09,030 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 171 transitions. Word has length 166 [2022-11-19 07:10:09,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:10:09,030 INFO L495 AbstractCegarLoop]: Abstraction has 169 states and 171 transitions. [2022-11-19 07:10:09,030 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 85 states have (on average 3.2705882352941176) internal successors, (278), 85 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:09,030 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 171 transitions. [2022-11-19 07:10:09,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2022-11-19 07:10:09,031 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:10:09,031 INFO L195 NwaCegarLoop]: trace histogram [28, 27, 27, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:10:09,039 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-11-19 07:10:09,231 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2022-11-19 07:10:09,232 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:10:09,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:10:09,232 INFO L85 PathProgramCache]: Analyzing trace with hash 604698053, now seen corresponding path program 39 times [2022-11-19 07:10:09,232 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:10:09,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [731156042] [2022-11-19 07:10:09,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:10:09,232 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:10:09,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:10:10,145 INFO L134 CoverageAnalysis]: Checked inductivity of 2108 backedges. 702 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:10:10,145 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:10:10,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [731156042] [2022-11-19 07:10:10,145 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [731156042] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:10:10,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [666724949] [2022-11-19 07:10:10,145 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:10:10,145 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:10:10,145 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:10:10,146 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:10:10,149 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-11-19 07:10:10,276 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:10:10,276 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:10:10,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 629 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-19 07:10:10,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:10:10,537 INFO L134 CoverageAnalysis]: Checked inductivity of 2108 backedges. 756 proven. 1352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:10:10,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:10:11,430 INFO L134 CoverageAnalysis]: Checked inductivity of 2108 backedges. 756 proven. 1352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:10:11,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [666724949] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:10:11,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [728301325] [2022-11-19 07:10:11,432 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:10:11,432 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:10:11,432 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:10:11,433 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:10:11,433 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:10:11,533 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:10:11,993 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39878#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:10:11,994 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:10:11,994 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:10:11,994 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 33 [2022-11-19 07:10:11,994 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549289678] [2022-11-19 07:10:11,994 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:10:11,995 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-11-19 07:10:11,995 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:10:11,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-11-19 07:10:11,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=517, Invalid=1289, Unknown=0, NotChecked=0, Total=1806 [2022-11-19 07:10:11,995 INFO L87 Difference]: Start difference. First operand 169 states and 171 transitions. Second operand has 34 states, 34 states have (on average 5.5588235294117645) internal successors, (189), 33 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:12,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:10:12,648 INFO L93 Difference]: Finished difference Result 186 states and 189 transitions. [2022-11-19 07:10:12,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-11-19 07:10:12,649 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 5.5588235294117645) internal successors, (189), 33 states have internal predecessors, (189), 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 168 [2022-11-19 07:10:12,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:10:12,650 INFO L225 Difference]: With dead ends: 186 [2022-11-19 07:10:12,650 INFO L226 Difference]: Without dead ends: 184 [2022-11-19 07:10:12,651 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 588 GetRequests, 465 SyntacticMatches, 52 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2324 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1512, Invalid=3744, Unknown=0, NotChecked=0, Total=5256 [2022-11-19 07:10:12,651 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 242 mSDsluCounter, 215 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 242 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:10:12,651 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [242 Valid, 251 Invalid, 323 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 290 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:10:12,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2022-11-19 07:10:12,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 177. [2022-11-19 07:10:12,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 176 states have (on average 1.0170454545454546) internal successors, (179), 176 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:12,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 179 transitions. [2022-11-19 07:10:12,671 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 179 transitions. Word has length 168 [2022-11-19 07:10:12,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:10:12,671 INFO L495 AbstractCegarLoop]: Abstraction has 177 states and 179 transitions. [2022-11-19 07:10:12,671 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 5.5588235294117645) internal successors, (189), 33 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:12,671 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 179 transitions. [2022-11-19 07:10:12,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2022-11-19 07:10:12,672 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:10:12,672 INFO L195 NwaCegarLoop]: trace histogram [29, 28, 28, 28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:10:12,679 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-11-19 07:10:12,873 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2022-11-19 07:10:12,873 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:10:12,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:10:12,873 INFO L85 PathProgramCache]: Analyzing trace with hash -1162104149, now seen corresponding path program 40 times [2022-11-19 07:10:12,873 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:10:12,874 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1540344306] [2022-11-19 07:10:12,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:10:12,874 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:10:12,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:10:14,538 INFO L134 CoverageAnalysis]: Checked inductivity of 2324 backedges. 1487 proven. 837 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:10:14,538 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:10:14,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1540344306] [2022-11-19 07:10:14,538 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1540344306] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:10:14,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1652671727] [2022-11-19 07:10:14,539 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:10:14,539 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:10:14,539 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:10:14,539 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:10:14,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-11-19 07:10:14,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:10:14,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 653 conjuncts, 58 conjunts are in the unsatisfiable core [2022-11-19 07:10:14,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:10:16,387 INFO L134 CoverageAnalysis]: Checked inductivity of 2324 backedges. 1566 proven. 756 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:10:16,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:10:17,637 INFO L134 CoverageAnalysis]: Checked inductivity of 2324 backedges. 1566 proven. 756 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:10:17,638 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1652671727] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:10:17,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [744261390] [2022-11-19 07:10:17,639 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:10:17,639 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:10:17,639 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:10:17,639 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:10:17,639 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:10:17,732 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:10:18,496 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '41624#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:10:18,496 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:10:18,496 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:10:18,496 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58, 58] total 89 [2022-11-19 07:10:18,497 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520349092] [2022-11-19 07:10:18,497 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:10:18,497 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2022-11-19 07:10:18,498 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:10:18,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2022-11-19 07:10:18,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1857, Invalid=7649, Unknown=0, NotChecked=0, Total=9506 [2022-11-19 07:10:18,499 INFO L87 Difference]: Start difference. First operand 177 states and 179 transitions. Second operand has 89 states, 89 states have (on average 3.3258426966292136) internal successors, (296), 89 states have internal predecessors, (296), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:19,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:10:19,801 INFO L93 Difference]: Finished difference Result 380 states and 411 transitions. [2022-11-19 07:10:19,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2022-11-19 07:10:19,802 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 3.3258426966292136) internal successors, (296), 89 states have internal predecessors, (296), 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 176 [2022-11-19 07:10:19,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:10:19,803 INFO L225 Difference]: With dead ends: 380 [2022-11-19 07:10:19,803 INFO L226 Difference]: Without dead ends: 263 [2022-11-19 07:10:19,804 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 613 GetRequests, 435 SyntacticMatches, 54 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6079 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=3483, Invalid=12267, Unknown=0, NotChecked=0, Total=15750 [2022-11-19 07:10:19,805 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 205 mSDsluCounter, 593 mSDsCounter, 0 mSdLazyCounter, 685 mSolverCounterSat, 148 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 651 SdHoareTripleChecker+Invalid, 833 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 148 IncrementalHoareTripleChecker+Valid, 685 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:10:19,805 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [205 Valid, 651 Invalid, 833 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [148 Valid, 685 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:10:19,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2022-11-19 07:10:19,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 179. [2022-11-19 07:10:19,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 178 states have (on average 1.0168539325842696) internal successors, (181), 178 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:19,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 181 transitions. [2022-11-19 07:10:19,825 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 181 transitions. Word has length 176 [2022-11-19 07:10:19,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:10:19,826 INFO L495 AbstractCegarLoop]: Abstraction has 179 states and 181 transitions. [2022-11-19 07:10:19,826 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 89 states have (on average 3.3258426966292136) internal successors, (296), 89 states have internal predecessors, (296), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:19,826 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 181 transitions. [2022-11-19 07:10:19,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-11-19 07:10:19,827 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:10:19,827 INFO L195 NwaCegarLoop]: trace histogram [29, 29, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:10:19,832 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2022-11-19 07:10:20,028 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:10:20,028 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:10:20,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:10:20,029 INFO L85 PathProgramCache]: Analyzing trace with hash 1842551312, now seen corresponding path program 41 times [2022-11-19 07:10:20,029 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:10:20,029 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [93211987] [2022-11-19 07:10:20,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:10:20,029 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:10:20,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:10:21,748 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1487 proven. 893 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:10:21,748 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:10:21,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [93211987] [2022-11-19 07:10:21,749 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [93211987] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:10:21,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [594541226] [2022-11-19 07:10:21,749 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:10:21,749 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:10:21,749 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:10:21,755 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:10:21,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-11-19 07:10:21,950 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2022-11-19 07:10:21,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:10:21,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-19 07:10:21,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:10:23,757 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1568 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:10:23,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:10:25,105 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1568 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:10:25,106 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [594541226] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:10:25,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1245344534] [2022-11-19 07:10:25,107 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:10:25,107 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:10:25,107 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:10:25,107 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:10:25,107 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:10:25,196 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:10:25,976 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '43660#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:10:25,976 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:10:25,976 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:10:25,976 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 91 [2022-11-19 07:10:25,976 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979002212] [2022-11-19 07:10:25,976 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:10:25,977 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2022-11-19 07:10:25,977 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:10:25,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2022-11-19 07:10:25,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1949, Invalid=7951, Unknown=0, NotChecked=0, Total=9900 [2022-11-19 07:10:25,978 INFO L87 Difference]: Start difference. First operand 179 states and 181 transitions. Second operand has 91 states, 91 states have (on average 3.2747252747252746) internal successors, (298), 91 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:27,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:10:27,396 INFO L93 Difference]: Finished difference Result 387 states and 419 transitions. [2022-11-19 07:10:27,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-11-19 07:10:27,397 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 3.2747252747252746) internal successors, (298), 91 states have internal predecessors, (298), 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 178 [2022-11-19 07:10:27,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:10:27,398 INFO L225 Difference]: With dead ends: 387 [2022-11-19 07:10:27,398 INFO L226 Difference]: Without dead ends: 268 [2022-11-19 07:10:27,399 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 621 GetRequests, 438 SyntacticMatches, 56 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6346 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=3691, Invalid=12821, Unknown=0, NotChecked=0, Total=16512 [2022-11-19 07:10:27,399 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 248 mSDsluCounter, 703 mSDsCounter, 0 mSdLazyCounter, 800 mSolverCounterSat, 203 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 248 SdHoareTripleChecker+Valid, 763 SdHoareTripleChecker+Invalid, 1003 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 203 IncrementalHoareTripleChecker+Valid, 800 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-19 07:10:27,399 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [248 Valid, 763 Invalid, 1003 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [203 Valid, 800 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-19 07:10:27,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2022-11-19 07:10:27,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 181. [2022-11-19 07:10:27,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 180 states have (on average 1.0166666666666666) internal successors, (183), 180 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:27,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 183 transitions. [2022-11-19 07:10:27,422 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 183 transitions. Word has length 178 [2022-11-19 07:10:27,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:10:27,423 INFO L495 AbstractCegarLoop]: Abstraction has 181 states and 183 transitions. [2022-11-19 07:10:27,423 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 91 states have (on average 3.2747252747252746) internal successors, (298), 91 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:27,423 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 183 transitions. [2022-11-19 07:10:27,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2022-11-19 07:10:27,431 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:10:27,432 INFO L195 NwaCegarLoop]: trace histogram [30, 29, 29, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:10:27,443 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-11-19 07:10:27,638 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:10:27,638 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:10:27,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:10:27,639 INFO L85 PathProgramCache]: Analyzing trace with hash -1196540875, now seen corresponding path program 42 times [2022-11-19 07:10:27,639 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:10:27,639 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507116998] [2022-11-19 07:10:27,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:10:27,639 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:10:27,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:10:28,681 INFO L134 CoverageAnalysis]: Checked inductivity of 2438 backedges. 812 proven. 1626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:10:28,681 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:10:28,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1507116998] [2022-11-19 07:10:28,681 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1507116998] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:10:28,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2057599949] [2022-11-19 07:10:28,681 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:10:28,682 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:10:28,682 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:10:28,683 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:10:28,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-11-19 07:10:28,828 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:10:28,829 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:10:28,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 673 conjuncts, 64 conjunts are in the unsatisfiable core [2022-11-19 07:10:28,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:10:29,092 INFO L134 CoverageAnalysis]: Checked inductivity of 2438 backedges. 870 proven. 1568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:10:29,092 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:10:30,113 INFO L134 CoverageAnalysis]: Checked inductivity of 2438 backedges. 870 proven. 1568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:10:30,114 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2057599949] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:10:30,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [59588033] [2022-11-19 07:10:30,115 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:10:30,115 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:10:30,115 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:10:30,115 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:10:30,115 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:10:30,223 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:10:30,696 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45668#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:10:30,696 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:10:30,696 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:10:30,697 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 35 [2022-11-19 07:10:30,697 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1499857448] [2022-11-19 07:10:30,697 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:10:30,698 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-19 07:10:30,698 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:10:30,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-19 07:10:30,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=580, Invalid=1400, Unknown=0, NotChecked=0, Total=1980 [2022-11-19 07:10:30,699 INFO L87 Difference]: Start difference. First operand 181 states and 183 transitions. Second operand has 36 states, 36 states have (on average 5.583333333333333) internal successors, (201), 35 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:31,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:10:31,370 INFO L93 Difference]: Finished difference Result 198 states and 201 transitions. [2022-11-19 07:10:31,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-11-19 07:10:31,371 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 5.583333333333333) internal successors, (201), 35 states have internal predecessors, (201), 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 180 [2022-11-19 07:10:31,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:10:31,371 INFO L225 Difference]: With dead ends: 198 [2022-11-19 07:10:31,372 INFO L226 Difference]: Without dead ends: 196 [2022-11-19 07:10:31,372 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 630 GetRequests, 499 SyntacticMatches, 56 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2608 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1705, Invalid=4147, Unknown=0, NotChecked=0, Total=5852 [2022-11-19 07:10:31,372 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 352 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 352 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:10:31,373 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [352 Valid, 242 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:10:31,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2022-11-19 07:10:31,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 189. [2022-11-19 07:10:31,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 188 states have (on average 1.0159574468085106) internal successors, (191), 188 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:31,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 191 transitions. [2022-11-19 07:10:31,394 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 191 transitions. Word has length 180 [2022-11-19 07:10:31,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:10:31,394 INFO L495 AbstractCegarLoop]: Abstraction has 189 states and 191 transitions. [2022-11-19 07:10:31,394 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 5.583333333333333) internal successors, (201), 35 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:31,395 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 191 transitions. [2022-11-19 07:10:31,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2022-11-19 07:10:31,396 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:10:31,396 INFO L195 NwaCegarLoop]: trace histogram [31, 30, 30, 30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:10:31,401 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2022-11-19 07:10:31,596 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:10:31,596 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:10:31,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:10:31,597 INFO L85 PathProgramCache]: Analyzing trace with hash -1867937509, now seen corresponding path program 43 times [2022-11-19 07:10:31,597 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:10:31,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686499116] [2022-11-19 07:10:31,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:10:31,597 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:10:31,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:10:33,500 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 1713 proven. 957 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:10:33,500 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:10:33,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686499116] [2022-11-19 07:10:33,500 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1686499116] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:10:33,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [401318870] [2022-11-19 07:10:33,501 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:10:33,501 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:10:33,501 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:10:33,502 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:10:33,504 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-11-19 07:10:33,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:10:33,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 697 conjuncts, 62 conjunts are in the unsatisfiable core [2022-11-19 07:10:33,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:10:35,549 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 1798 proven. 870 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:10:35,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:10:36,958 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 1798 proven. 870 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:10:36,958 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [401318870] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:10:36,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1645290290] [2022-11-19 07:10:36,959 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:10:36,959 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:10:36,959 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:10:36,959 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:10:36,960 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:10:37,059 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:10:37,864 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '47532#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:10:37,864 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:10:37,864 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:10:37,864 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 62, 62] total 95 [2022-11-19 07:10:37,864 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853114212] [2022-11-19 07:10:37,864 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:10:37,865 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 95 states [2022-11-19 07:10:37,865 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:10:37,866 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2022-11-19 07:10:37,866 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2107, Invalid=8605, Unknown=0, NotChecked=0, Total=10712 [2022-11-19 07:10:37,866 INFO L87 Difference]: Start difference. First operand 189 states and 191 transitions. Second operand has 95 states, 95 states have (on average 3.3263157894736843) internal successors, (316), 95 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:39,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:10:39,338 INFO L93 Difference]: Finished difference Result 406 states and 439 transitions. [2022-11-19 07:10:39,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-11-19 07:10:39,338 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 95 states have (on average 3.3263157894736843) internal successors, (316), 95 states have internal predecessors, (316), 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 188 [2022-11-19 07:10:39,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:10:39,339 INFO L225 Difference]: With dead ends: 406 [2022-11-19 07:10:39,340 INFO L226 Difference]: Without dead ends: 281 [2022-11-19 07:10:39,341 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 655 GetRequests, 465 SyntacticMatches, 58 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6873 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=3969, Invalid=13853, Unknown=0, NotChecked=0, Total=17822 [2022-11-19 07:10:39,342 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 269 mSDsluCounter, 582 mSDsCounter, 0 mSdLazyCounter, 679 mSolverCounterSat, 279 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 269 SdHoareTripleChecker+Valid, 644 SdHoareTripleChecker+Invalid, 958 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 279 IncrementalHoareTripleChecker+Valid, 679 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:10:39,342 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [269 Valid, 644 Invalid, 958 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [279 Valid, 679 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:10:39,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2022-11-19 07:10:39,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 191. [2022-11-19 07:10:39,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 190 states have (on average 1.0157894736842106) internal successors, (193), 190 states have internal predecessors, (193), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:39,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 193 transitions. [2022-11-19 07:10:39,374 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 193 transitions. Word has length 188 [2022-11-19 07:10:39,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:10:39,375 INFO L495 AbstractCegarLoop]: Abstraction has 191 states and 193 transitions. [2022-11-19 07:10:39,375 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 95 states, 95 states have (on average 3.3263157894736843) internal successors, (316), 95 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:39,375 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 193 transitions. [2022-11-19 07:10:39,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2022-11-19 07:10:39,376 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:10:39,376 INFO L195 NwaCegarLoop]: trace histogram [31, 31, 30, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:10:39,381 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-11-19 07:10:39,576 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:10:39,577 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:10:39,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:10:39,577 INFO L85 PathProgramCache]: Analyzing trace with hash 714080512, now seen corresponding path program 44 times [2022-11-19 07:10:39,577 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:10:39,577 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1267944086] [2022-11-19 07:10:39,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:10:39,577 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:10:39,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:10:41,554 INFO L134 CoverageAnalysis]: Checked inductivity of 2730 backedges. 1713 proven. 1017 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:10:41,554 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:10:41,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1267944086] [2022-11-19 07:10:41,555 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1267944086] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:10:41,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [28024707] [2022-11-19 07:10:41,555 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:10:41,555 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:10:41,555 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:10:41,556 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:10:41,558 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-11-19 07:10:41,757 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 31 check-sat command(s) [2022-11-19 07:10:41,758 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:10:41,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 707 conjuncts, 64 conjunts are in the unsatisfiable core [2022-11-19 07:10:41,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:10:43,790 INFO L134 CoverageAnalysis]: Checked inductivity of 2730 backedges. 1800 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:10:43,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:10:45,276 INFO L134 CoverageAnalysis]: Checked inductivity of 2730 backedges. 1800 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:10:45,276 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [28024707] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:10:45,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1211943776] [2022-11-19 07:10:45,277 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:10:45,278 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:10:45,278 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:10:45,278 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:10:45,278 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:10:45,388 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:10:46,230 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '49706#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:10:46,230 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:10:46,231 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:10:46,231 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 97 [2022-11-19 07:10:46,231 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478926469] [2022-11-19 07:10:46,231 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:10:46,231 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2022-11-19 07:10:46,231 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:10:46,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2022-11-19 07:10:46,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2205, Invalid=8925, Unknown=0, NotChecked=0, Total=11130 [2022-11-19 07:10:46,233 INFO L87 Difference]: Start difference. First operand 191 states and 193 transitions. Second operand has 97 states, 97 states have (on average 3.2783505154639174) internal successors, (318), 97 states have internal predecessors, (318), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:47,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:10:47,757 INFO L93 Difference]: Finished difference Result 413 states and 447 transitions. [2022-11-19 07:10:47,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-11-19 07:10:47,758 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 3.2783505154639174) internal successors, (318), 97 states have internal predecessors, (318), 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 190 [2022-11-19 07:10:47,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:10:47,759 INFO L225 Difference]: With dead ends: 413 [2022-11-19 07:10:47,759 INFO L226 Difference]: Without dead ends: 286 [2022-11-19 07:10:47,760 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 663 GetRequests, 468 SyntacticMatches, 60 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7156 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=4191, Invalid=14441, Unknown=0, NotChecked=0, Total=18632 [2022-11-19 07:10:47,760 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 269 mSDsluCounter, 599 mSDsCounter, 0 mSdLazyCounter, 699 mSolverCounterSat, 156 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 269 SdHoareTripleChecker+Valid, 663 SdHoareTripleChecker+Invalid, 855 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 156 IncrementalHoareTripleChecker+Valid, 699 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:10:47,760 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [269 Valid, 663 Invalid, 855 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [156 Valid, 699 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:10:47,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2022-11-19 07:10:47,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 193. [2022-11-19 07:10:47,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 192 states have (on average 1.015625) internal successors, (195), 192 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:47,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 195 transitions. [2022-11-19 07:10:47,794 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 195 transitions. Word has length 190 [2022-11-19 07:10:47,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:10:47,795 INFO L495 AbstractCegarLoop]: Abstraction has 193 states and 195 transitions. [2022-11-19 07:10:47,795 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 3.2783505154639174) internal successors, (318), 97 states have internal predecessors, (318), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:47,795 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 195 transitions. [2022-11-19 07:10:47,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2022-11-19 07:10:47,796 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:10:47,797 INFO L195 NwaCegarLoop]: trace histogram [32, 31, 31, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:10:47,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-11-19 07:10:48,003 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2022-11-19 07:10:48,003 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:10:48,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:10:48,003 INFO L85 PathProgramCache]: Analyzing trace with hash -457698395, now seen corresponding path program 45 times [2022-11-19 07:10:48,003 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:10:48,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141359708] [2022-11-19 07:10:48,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:10:48,004 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:10:48,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:10:49,347 INFO L134 CoverageAnalysis]: Checked inductivity of 2792 backedges. 930 proven. 1862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:10:49,347 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:10:49,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141359708] [2022-11-19 07:10:49,347 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [141359708] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:10:49,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [615373180] [2022-11-19 07:10:49,347 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:10:49,347 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:10:49,347 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:10:49,351 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:10:49,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-11-19 07:10:49,492 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:10:49,492 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:10:49,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 717 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-19 07:10:49,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:10:49,770 INFO L134 CoverageAnalysis]: Checked inductivity of 2792 backedges. 992 proven. 1800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:10:49,770 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:10:50,801 INFO L134 CoverageAnalysis]: Checked inductivity of 2792 backedges. 992 proven. 1800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:10:50,801 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [615373180] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:10:50,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [847881607] [2022-11-19 07:10:50,802 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:10:50,802 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:10:50,803 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:10:50,803 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:10:50,803 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:10:50,900 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:10:51,392 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '51848#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:10:51,392 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:10:51,392 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:10:51,392 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 37 [2022-11-19 07:10:51,392 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194310666] [2022-11-19 07:10:51,392 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:10:51,393 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-19 07:10:51,393 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:10:51,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-19 07:10:51,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=647, Invalid=1515, Unknown=0, NotChecked=0, Total=2162 [2022-11-19 07:10:51,394 INFO L87 Difference]: Start difference. First operand 193 states and 195 transitions. Second operand has 38 states, 38 states have (on average 5.605263157894737) internal successors, (213), 37 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:52,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:10:52,134 INFO L93 Difference]: Finished difference Result 210 states and 213 transitions. [2022-11-19 07:10:52,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-11-19 07:10:52,135 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 5.605263157894737) internal successors, (213), 37 states have internal predecessors, (213), 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 192 [2022-11-19 07:10:52,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:10:52,135 INFO L225 Difference]: With dead ends: 210 [2022-11-19 07:10:52,136 INFO L226 Difference]: Without dead ends: 208 [2022-11-19 07:10:52,136 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 672 GetRequests, 533 SyntacticMatches, 60 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2908 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1910, Invalid=4570, Unknown=0, NotChecked=0, Total=6480 [2022-11-19 07:10:52,137 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 305 mSDsluCounter, 205 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 305 SdHoareTripleChecker+Valid, 245 SdHoareTripleChecker+Invalid, 333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:10:52,137 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [305 Valid, 245 Invalid, 333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 296 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:10:52,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2022-11-19 07:10:52,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 201. [2022-11-19 07:10:52,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 200 states have (on average 1.015) internal successors, (203), 200 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:52,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 203 transitions. [2022-11-19 07:10:52,167 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 203 transitions. Word has length 192 [2022-11-19 07:10:52,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:10:52,167 INFO L495 AbstractCegarLoop]: Abstraction has 201 states and 203 transitions. [2022-11-19 07:10:52,168 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 5.605263157894737) internal successors, (213), 37 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:10:52,168 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 203 transitions. [2022-11-19 07:10:52,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2022-11-19 07:10:52,169 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:10:52,169 INFO L195 NwaCegarLoop]: trace histogram [33, 32, 32, 32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:10:52,175 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2022-11-19 07:10:52,375 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2022-11-19 07:10:52,376 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:10:52,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:10:52,376 INFO L85 PathProgramCache]: Analyzing trace with hash -86183797, now seen corresponding path program 46 times [2022-11-19 07:10:52,376 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:10:52,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1265484815] [2022-11-19 07:10:52,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:10:52,376 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:10:52,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:10:54,557 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 1955 proven. 1085 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:10:54,557 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:10:54,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1265484815] [2022-11-19 07:10:54,557 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1265484815] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:10:54,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [67896484] [2022-11-19 07:10:54,557 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:10:54,557 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:10:54,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:10:54,558 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:10:54,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-11-19 07:10:54,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:10:54,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 741 conjuncts, 66 conjunts are in the unsatisfiable core [2022-11-19 07:10:54,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:10:56,871 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 2046 proven. 992 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:10:56,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:10:58,433 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 2046 proven. 992 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:10:58,433 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [67896484] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:10:58,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [654162478] [2022-11-19 07:10:58,434 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:10:58,434 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:10:58,434 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:10:58,434 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:10:58,434 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:10:58,538 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:10:59,380 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '53830#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:10:59,380 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:10:59,380 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:10:59,380 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 66, 66] total 101 [2022-11-19 07:10:59,380 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55144364] [2022-11-19 07:10:59,380 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:10:59,381 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2022-11-19 07:10:59,381 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:10:59,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2022-11-19 07:10:59,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2373, Invalid=9617, Unknown=0, NotChecked=0, Total=11990 [2022-11-19 07:10:59,383 INFO L87 Difference]: Start difference. First operand 201 states and 203 transitions. Second operand has 101 states, 101 states have (on average 3.3267326732673266) internal successors, (336), 101 states have internal predecessors, (336), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:01,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:11:01,088 INFO L93 Difference]: Finished difference Result 432 states and 467 transitions. [2022-11-19 07:11:01,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-11-19 07:11:01,089 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 3.3267326732673266) internal successors, (336), 101 states have internal predecessors, (336), 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 200 [2022-11-19 07:11:01,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:11:01,089 INFO L225 Difference]: With dead ends: 432 [2022-11-19 07:11:01,089 INFO L226 Difference]: Without dead ends: 299 [2022-11-19 07:11:01,091 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 697 GetRequests, 495 SyntacticMatches, 62 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7715 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=4487, Invalid=15535, Unknown=0, NotChecked=0, Total=20022 [2022-11-19 07:11:01,091 INFO L413 NwaCegarLoop]: 66 mSDtfsCounter, 327 mSDsluCounter, 729 mSDsCounter, 0 mSdLazyCounter, 842 mSolverCounterSat, 316 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 327 SdHoareTripleChecker+Valid, 795 SdHoareTripleChecker+Invalid, 1158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 316 IncrementalHoareTripleChecker+Valid, 842 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-19 07:11:01,092 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [327 Valid, 795 Invalid, 1158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [316 Valid, 842 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-19 07:11:01,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2022-11-19 07:11:01,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 203. [2022-11-19 07:11:01,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 202 states have (on average 1.0148514851485149) internal successors, (205), 202 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:01,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 205 transitions. [2022-11-19 07:11:01,114 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 205 transitions. Word has length 200 [2022-11-19 07:11:01,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:11:01,115 INFO L495 AbstractCegarLoop]: Abstraction has 203 states and 205 transitions. [2022-11-19 07:11:01,115 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 3.3267326732673266) internal successors, (336), 101 states have internal predecessors, (336), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:01,115 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 205 transitions. [2022-11-19 07:11:01,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2022-11-19 07:11:01,116 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:11:01,116 INFO L195 NwaCegarLoop]: trace histogram [33, 33, 32, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:11:01,124 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2022-11-19 07:11:01,324 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:11:01,324 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:11:01,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:11:01,324 INFO L85 PathProgramCache]: Analyzing trace with hash 788379888, now seen corresponding path program 47 times [2022-11-19 07:11:01,324 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:11:01,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2002279159] [2022-11-19 07:11:01,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:11:01,325 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:11:01,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:03,540 INFO L134 CoverageAnalysis]: Checked inductivity of 3104 backedges. 1955 proven. 1149 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:03,541 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:11:03,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2002279159] [2022-11-19 07:11:03,541 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2002279159] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:11:03,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1778870358] [2022-11-19 07:11:03,541 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:11:03,541 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:11:03,541 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:11:03,542 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:11:03,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-11-19 07:11:03,759 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2022-11-19 07:11:03,759 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:11:03,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 751 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-19 07:11:03,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:11:05,996 INFO L134 CoverageAnalysis]: Checked inductivity of 3104 backedges. 2048 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:05,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:11:07,650 INFO L134 CoverageAnalysis]: Checked inductivity of 3104 backedges. 2048 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:07,650 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1778870358] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:11:07,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1249817461] [2022-11-19 07:11:07,652 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:11:07,652 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:11:07,652 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:11:07,652 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:11:07,652 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:11:07,752 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:11:08,608 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '56142#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:11:08,608 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:11:08,608 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:11:08,608 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 103 [2022-11-19 07:11:08,608 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670155418] [2022-11-19 07:11:08,609 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:11:08,609 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2022-11-19 07:11:08,609 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:11:08,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2022-11-19 07:11:08,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2477, Invalid=9955, Unknown=0, NotChecked=0, Total=12432 [2022-11-19 07:11:08,611 INFO L87 Difference]: Start difference. First operand 203 states and 205 transitions. Second operand has 103 states, 103 states have (on average 3.2815533980582523) internal successors, (338), 103 states have internal predecessors, (338), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:10,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:11:10,286 INFO L93 Difference]: Finished difference Result 439 states and 475 transitions. [2022-11-19 07:11:10,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-11-19 07:11:10,287 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 3.2815533980582523) internal successors, (338), 103 states have internal predecessors, (338), 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 202 [2022-11-19 07:11:10,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:11:10,287 INFO L225 Difference]: With dead ends: 439 [2022-11-19 07:11:10,287 INFO L226 Difference]: Without dead ends: 304 [2022-11-19 07:11:10,289 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 705 GetRequests, 498 SyntacticMatches, 64 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8014 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=4723, Invalid=16157, Unknown=0, NotChecked=0, Total=20880 [2022-11-19 07:11:10,289 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 302 mSDsluCounter, 614 mSDsCounter, 0 mSdLazyCounter, 708 mSolverCounterSat, 274 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 302 SdHoareTripleChecker+Valid, 682 SdHoareTripleChecker+Invalid, 982 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 274 IncrementalHoareTripleChecker+Valid, 708 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-19 07:11:10,289 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [302 Valid, 682 Invalid, 982 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [274 Valid, 708 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-19 07:11:10,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2022-11-19 07:11:10,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 205. [2022-11-19 07:11:10,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 204 states have (on average 1.0147058823529411) internal successors, (207), 204 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:10,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 207 transitions. [2022-11-19 07:11:10,316 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 207 transitions. Word has length 202 [2022-11-19 07:11:10,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:11:10,316 INFO L495 AbstractCegarLoop]: Abstraction has 205 states and 207 transitions. [2022-11-19 07:11:10,316 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 3.2815533980582523) internal successors, (338), 103 states have internal predecessors, (338), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:10,316 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 207 transitions. [2022-11-19 07:11:10,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2022-11-19 07:11:10,317 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:11:10,317 INFO L195 NwaCegarLoop]: trace histogram [34, 33, 33, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:11:10,324 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2022-11-19 07:11:10,524 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-11-19 07:11:10,524 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:11:10,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:11:10,524 INFO L85 PathProgramCache]: Analyzing trace with hash -569508843, now seen corresponding path program 48 times [2022-11-19 07:11:10,524 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:11:10,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2008251148] [2022-11-19 07:11:10,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:11:10,525 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:11:10,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:11,915 INFO L134 CoverageAnalysis]: Checked inductivity of 3170 backedges. 1056 proven. 2114 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:11,915 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:11:11,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2008251148] [2022-11-19 07:11:11,915 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2008251148] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:11:11,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [132068326] [2022-11-19 07:11:11,916 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:11:11,916 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:11:11,916 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:11:11,918 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:11:11,921 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-11-19 07:11:12,065 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:11:12,065 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:11:12,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 761 conjuncts, 72 conjunts are in the unsatisfiable core [2022-11-19 07:11:12,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:11:12,338 INFO L134 CoverageAnalysis]: Checked inductivity of 3170 backedges. 1122 proven. 2048 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:12,339 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:11:13,472 INFO L134 CoverageAnalysis]: Checked inductivity of 3170 backedges. 1122 proven. 2048 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:13,473 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [132068326] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:11:13,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1265045107] [2022-11-19 07:11:13,474 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:11:13,474 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:11:13,474 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:11:13,474 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:11:13,474 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:11:13,580 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:11:14,084 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '58418#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:11:14,084 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:11:14,084 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:11:14,084 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 39 [2022-11-19 07:11:14,084 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257451762] [2022-11-19 07:11:14,084 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:11:14,085 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-19 07:11:14,085 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:11:14,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-19 07:11:14,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=718, Invalid=1634, Unknown=0, NotChecked=0, Total=2352 [2022-11-19 07:11:14,085 INFO L87 Difference]: Start difference. First operand 205 states and 207 transitions. Second operand has 40 states, 40 states have (on average 5.625) internal successors, (225), 39 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:14,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:11:14,897 INFO L93 Difference]: Finished difference Result 222 states and 225 transitions. [2022-11-19 07:11:14,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-11-19 07:11:14,898 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 5.625) internal successors, (225), 39 states have internal predecessors, (225), 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 204 [2022-11-19 07:11:14,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:11:14,899 INFO L225 Difference]: With dead ends: 222 [2022-11-19 07:11:14,899 INFO L226 Difference]: Without dead ends: 220 [2022-11-19 07:11:14,900 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 714 GetRequests, 567 SyntacticMatches, 64 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3224 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2127, Invalid=5013, Unknown=0, NotChecked=0, Total=7140 [2022-11-19 07:11:14,900 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 219 mSDsluCounter, 280 mSDsCounter, 0 mSdLazyCounter, 365 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 219 SdHoareTripleChecker+Valid, 322 SdHoareTripleChecker+Invalid, 404 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 365 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:11:14,900 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [219 Valid, 322 Invalid, 404 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 365 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:11:14,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2022-11-19 07:11:14,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 213. [2022-11-19 07:11:14,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 212 states have (on average 1.0141509433962264) internal successors, (215), 212 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:14,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 215 transitions. [2022-11-19 07:11:14,941 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 215 transitions. Word has length 204 [2022-11-19 07:11:14,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:11:14,941 INFO L495 AbstractCegarLoop]: Abstraction has 213 states and 215 transitions. [2022-11-19 07:11:14,942 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 5.625) internal successors, (225), 39 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:14,942 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 215 transitions. [2022-11-19 07:11:14,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2022-11-19 07:11:14,943 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:11:14,943 INFO L195 NwaCegarLoop]: trace histogram [35, 34, 34, 34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:11:14,950 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2022-11-19 07:11:15,149 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:11:15,150 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:11:15,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:11:15,150 INFO L85 PathProgramCache]: Analyzing trace with hash -1313117957, now seen corresponding path program 49 times [2022-11-19 07:11:15,150 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:11:15,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [532245083] [2022-11-19 07:11:15,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:11:15,151 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:11:15,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:17,581 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 2213 proven. 1221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:17,581 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:11:17,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [532245083] [2022-11-19 07:11:17,582 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [532245083] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:11:17,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [354257127] [2022-11-19 07:11:17,582 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:11:17,582 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:11:17,582 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:11:17,583 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:11:17,585 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-11-19 07:11:17,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:17,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 785 conjuncts, 70 conjunts are in the unsatisfiable core [2022-11-19 07:11:17,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:11:20,094 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 2310 proven. 1122 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:11:20,094 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:11:21,871 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 2310 proven. 1122 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:11:21,871 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [354257127] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:11:21,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [481915997] [2022-11-19 07:11:21,872 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:11:21,872 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:11:21,872 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:11:21,873 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:11:21,873 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:11:21,970 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:11:22,834 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '60518#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:11:22,834 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:11:22,835 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:11:22,835 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 70, 70] total 107 [2022-11-19 07:11:22,835 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461281401] [2022-11-19 07:11:22,835 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:11:22,836 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2022-11-19 07:11:22,836 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:11:22,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2022-11-19 07:11:22,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2655, Invalid=10685, Unknown=0, NotChecked=0, Total=13340 [2022-11-19 07:11:22,838 INFO L87 Difference]: Start difference. First operand 213 states and 215 transitions. Second operand has 107 states, 107 states have (on average 3.3271028037383177) internal successors, (356), 107 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:24,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:11:24,699 INFO L93 Difference]: Finished difference Result 458 states and 495 transitions. [2022-11-19 07:11:24,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-11-19 07:11:24,699 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 3.3271028037383177) internal successors, (356), 107 states have internal predecessors, (356), 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 212 [2022-11-19 07:11:24,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:11:24,700 INFO L225 Difference]: With dead ends: 458 [2022-11-19 07:11:24,701 INFO L226 Difference]: Without dead ends: 317 [2022-11-19 07:11:24,702 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 739 GetRequests, 525 SyntacticMatches, 66 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8605 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=5037, Invalid=17313, Unknown=0, NotChecked=0, Total=22350 [2022-11-19 07:11:24,703 INFO L413 NwaCegarLoop]: 70 mSDtfsCounter, 297 mSDsluCounter, 781 mSDsCounter, 0 mSdLazyCounter, 905 mSolverCounterSat, 240 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 297 SdHoareTripleChecker+Valid, 851 SdHoareTripleChecker+Invalid, 1145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 240 IncrementalHoareTripleChecker+Valid, 905 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-19 07:11:24,703 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [297 Valid, 851 Invalid, 1145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [240 Valid, 905 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-19 07:11:24,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2022-11-19 07:11:24,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 215. [2022-11-19 07:11:24,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 214 states have (on average 1.014018691588785) internal successors, (217), 214 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:24,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 217 transitions. [2022-11-19 07:11:24,744 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 217 transitions. Word has length 212 [2022-11-19 07:11:24,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:11:24,745 INFO L495 AbstractCegarLoop]: Abstraction has 215 states and 217 transitions. [2022-11-19 07:11:24,745 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 3.3271028037383177) internal successors, (356), 107 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:24,745 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 217 transitions. [2022-11-19 07:11:24,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2022-11-19 07:11:24,746 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:11:24,746 INFO L195 NwaCegarLoop]: trace histogram [35, 35, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:11:24,753 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Ended with exit code 0 [2022-11-19 07:11:24,953 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:11:24,953 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:11:24,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:11:24,954 INFO L85 PathProgramCache]: Analyzing trace with hash 748798432, now seen corresponding path program 50 times [2022-11-19 07:11:24,954 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:11:24,954 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1196651261] [2022-11-19 07:11:24,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:11:24,954 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:11:25,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:27,499 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 2213 proven. 1289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:27,499 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:11:27,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1196651261] [2022-11-19 07:11:27,499 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1196651261] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:11:27,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [935262965] [2022-11-19 07:11:27,499 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:11:27,500 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:11:27,500 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:11:27,502 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:11:27,504 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-11-19 07:11:27,729 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2022-11-19 07:11:27,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:11:27,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 795 conjuncts, 72 conjunts are in the unsatisfiable core [2022-11-19 07:11:27,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:11:30,255 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 2312 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:30,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:11:32,121 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 2312 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:32,122 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [935262965] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:11:32,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [162978085] [2022-11-19 07:11:32,123 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:11:32,123 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:11:32,123 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:11:32,123 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:11:32,123 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:11:32,220 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:11:33,099 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '62968#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:11:33,099 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:11:33,099 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:11:33,099 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 109 [2022-11-19 07:11:33,099 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543988610] [2022-11-19 07:11:33,099 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:11:33,100 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2022-11-19 07:11:33,100 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:11:33,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2022-11-19 07:11:33,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2765, Invalid=11041, Unknown=0, NotChecked=0, Total=13806 [2022-11-19 07:11:33,102 INFO L87 Difference]: Start difference. First operand 215 states and 217 transitions. Second operand has 109 states, 109 states have (on average 3.2844036697247705) internal successors, (358), 109 states have internal predecessors, (358), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:35,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:11:35,013 INFO L93 Difference]: Finished difference Result 465 states and 503 transitions. [2022-11-19 07:11:35,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2022-11-19 07:11:35,013 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 109 states have (on average 3.2844036697247705) internal successors, (358), 109 states have internal predecessors, (358), 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 214 [2022-11-19 07:11:35,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:11:35,015 INFO L225 Difference]: With dead ends: 465 [2022-11-19 07:11:35,015 INFO L226 Difference]: Without dead ends: 322 [2022-11-19 07:11:35,016 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 747 GetRequests, 528 SyntacticMatches, 68 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8920 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=5287, Invalid=17969, Unknown=0, NotChecked=0, Total=23256 [2022-11-19 07:11:35,016 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 318 mSDsluCounter, 719 mSDsCounter, 0 mSdLazyCounter, 831 mSolverCounterSat, 251 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 318 SdHoareTripleChecker+Valid, 791 SdHoareTripleChecker+Invalid, 1082 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 251 IncrementalHoareTripleChecker+Valid, 831 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-19 07:11:35,017 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [318 Valid, 791 Invalid, 1082 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [251 Valid, 831 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-19 07:11:35,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2022-11-19 07:11:35,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 217. [2022-11-19 07:11:35,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 216 states have (on average 1.0138888888888888) internal successors, (219), 216 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:35,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 219 transitions. [2022-11-19 07:11:35,043 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 219 transitions. Word has length 214 [2022-11-19 07:11:35,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:11:35,043 INFO L495 AbstractCegarLoop]: Abstraction has 217 states and 219 transitions. [2022-11-19 07:11:35,043 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 109 states have (on average 3.2844036697247705) internal successors, (358), 109 states have internal predecessors, (358), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:35,044 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 219 transitions. [2022-11-19 07:11:35,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2022-11-19 07:11:35,044 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:11:35,044 INFO L195 NwaCegarLoop]: trace histogram [36, 35, 35, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:11:35,049 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2022-11-19 07:11:35,247 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2022-11-19 07:11:35,247 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:11:35,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:11:35,247 INFO L85 PathProgramCache]: Analyzing trace with hash -2024442491, now seen corresponding path program 51 times [2022-11-19 07:11:35,247 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:11:35,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [65976914] [2022-11-19 07:11:35,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:11:35,248 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:11:35,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:36,770 INFO L134 CoverageAnalysis]: Checked inductivity of 3572 backedges. 1190 proven. 2382 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:36,770 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:11:36,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [65976914] [2022-11-19 07:11:36,770 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [65976914] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:11:36,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1203674646] [2022-11-19 07:11:36,771 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:11:36,771 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:11:36,771 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:11:36,772 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:11:36,774 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2022-11-19 07:11:36,925 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:11:36,926 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:11:36,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 805 conjuncts, 76 conjunts are in the unsatisfiable core [2022-11-19 07:11:36,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:11:37,209 INFO L134 CoverageAnalysis]: Checked inductivity of 3572 backedges. 1260 proven. 2312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:37,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:11:38,484 INFO L134 CoverageAnalysis]: Checked inductivity of 3572 backedges. 1260 proven. 2312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:38,484 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1203674646] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:11:38,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2001614551] [2022-11-19 07:11:38,486 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:11:38,486 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:11:38,486 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:11:38,486 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:11:38,486 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:11:38,592 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:11:39,094 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '65378#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:11:39,095 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:11:39,095 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:11:39,095 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 41 [2022-11-19 07:11:39,095 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1162407487] [2022-11-19 07:11:39,095 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:11:39,096 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-11-19 07:11:39,096 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:11:39,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-11-19 07:11:39,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=793, Invalid=1757, Unknown=0, NotChecked=0, Total=2550 [2022-11-19 07:11:39,096 INFO L87 Difference]: Start difference. First operand 217 states and 219 transitions. Second operand has 42 states, 42 states have (on average 5.642857142857143) internal successors, (237), 41 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:39,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:11:39,969 INFO L93 Difference]: Finished difference Result 234 states and 237 transitions. [2022-11-19 07:11:39,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2022-11-19 07:11:39,970 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 5.642857142857143) internal successors, (237), 41 states have internal predecessors, (237), 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 216 [2022-11-19 07:11:39,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:11:39,971 INFO L225 Difference]: With dead ends: 234 [2022-11-19 07:11:39,971 INFO L226 Difference]: Without dead ends: 232 [2022-11-19 07:11:39,971 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 756 GetRequests, 601 SyntacticMatches, 68 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3556 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2356, Invalid=5476, Unknown=0, NotChecked=0, Total=7832 [2022-11-19 07:11:39,972 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 230 mSDsluCounter, 288 mSDsCounter, 0 mSdLazyCounter, 381 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 230 SdHoareTripleChecker+Valid, 332 SdHoareTripleChecker+Invalid, 422 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 381 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:11:39,972 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [230 Valid, 332 Invalid, 422 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 381 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:11:39,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2022-11-19 07:11:40,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 225. [2022-11-19 07:11:40,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 224 states have (on average 1.0133928571428572) internal successors, (227), 224 states have internal predecessors, (227), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:40,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 227 transitions. [2022-11-19 07:11:40,016 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 227 transitions. Word has length 216 [2022-11-19 07:11:40,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:11:40,016 INFO L495 AbstractCegarLoop]: Abstraction has 225 states and 227 transitions. [2022-11-19 07:11:40,017 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 5.642857142857143) internal successors, (237), 41 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:40,017 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 227 transitions. [2022-11-19 07:11:40,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2022-11-19 07:11:40,018 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:11:40,018 INFO L195 NwaCegarLoop]: trace histogram [37, 36, 36, 36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:11:40,025 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2022-11-19 07:11:40,224 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:11:40,224 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:11:40,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:11:40,225 INFO L85 PathProgramCache]: Analyzing trace with hash 1516925547, now seen corresponding path program 52 times [2022-11-19 07:11:40,225 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:11:40,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1693062965] [2022-11-19 07:11:40,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:11:40,225 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:11:40,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:42,914 INFO L134 CoverageAnalysis]: Checked inductivity of 3852 backedges. 2487 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:42,914 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:11:42,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1693062965] [2022-11-19 07:11:42,914 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1693062965] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:11:42,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [597485137] [2022-11-19 07:11:42,914 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:11:42,915 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:11:42,915 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:11:42,916 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:11:42,918 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2022-11-19 07:11:43,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:43,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 829 conjuncts, 74 conjunts are in the unsatisfiable core [2022-11-19 07:11:43,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:11:45,683 INFO L134 CoverageAnalysis]: Checked inductivity of 3852 backedges. 2590 proven. 1260 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:11:45,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:11:47,627 INFO L134 CoverageAnalysis]: Checked inductivity of 3852 backedges. 2590 proven. 1260 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:11:47,627 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [597485137] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:11:47,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2041833154] [2022-11-19 07:11:47,628 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:11:47,628 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:11:47,628 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:11:47,629 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:11:47,629 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:11:47,728 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:11:48,627 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '67596#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:11:48,627 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:11:48,627 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:11:48,628 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 74, 74] total 113 [2022-11-19 07:11:48,628 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186269789] [2022-11-19 07:11:48,628 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:11:48,629 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2022-11-19 07:11:48,629 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:11:48,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2022-11-19 07:11:48,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2953, Invalid=11809, Unknown=0, NotChecked=0, Total=14762 [2022-11-19 07:11:48,631 INFO L87 Difference]: Start difference. First operand 225 states and 227 transitions. Second operand has 113 states, 113 states have (on average 3.327433628318584) internal successors, (376), 113 states have internal predecessors, (376), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:50,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:11:50,681 INFO L93 Difference]: Finished difference Result 484 states and 523 transitions. [2022-11-19 07:11:50,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-11-19 07:11:50,682 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 113 states have (on average 3.327433628318584) internal successors, (376), 113 states have internal predecessors, (376), 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 224 [2022-11-19 07:11:50,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:11:50,683 INFO L225 Difference]: With dead ends: 484 [2022-11-19 07:11:50,683 INFO L226 Difference]: Without dead ends: 335 [2022-11-19 07:11:50,684 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 781 GetRequests, 555 SyntacticMatches, 70 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9543 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=5619, Invalid=19187, Unknown=0, NotChecked=0, Total=24806 [2022-11-19 07:11:50,684 INFO L413 NwaCegarLoop]: 74 mSDtfsCounter, 372 mSDsluCounter, 777 mSDsCounter, 0 mSdLazyCounter, 896 mSolverCounterSat, 394 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 372 SdHoareTripleChecker+Valid, 851 SdHoareTripleChecker+Invalid, 1290 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 394 IncrementalHoareTripleChecker+Valid, 896 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-19 07:11:50,685 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [372 Valid, 851 Invalid, 1290 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [394 Valid, 896 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-19 07:11:50,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2022-11-19 07:11:50,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 227. [2022-11-19 07:11:50,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 226 states have (on average 1.0132743362831858) internal successors, (229), 226 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:50,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 229 transitions. [2022-11-19 07:11:50,712 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 229 transitions. Word has length 224 [2022-11-19 07:11:50,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:11:50,712 INFO L495 AbstractCegarLoop]: Abstraction has 227 states and 229 transitions. [2022-11-19 07:11:50,712 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 113 states have (on average 3.327433628318584) internal successors, (376), 113 states have internal predecessors, (376), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:50,712 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 229 transitions. [2022-11-19 07:11:50,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2022-11-19 07:11:50,714 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:11:50,714 INFO L195 NwaCegarLoop]: trace histogram [37, 37, 36, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:11:50,719 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Ended with exit code 0 [2022-11-19 07:11:50,918 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:11:50,918 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:11:50,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:11:50,919 INFO L85 PathProgramCache]: Analyzing trace with hash 297901008, now seen corresponding path program 53 times [2022-11-19 07:11:50,919 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:11:50,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [132359454] [2022-11-19 07:11:50,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:11:50,919 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:11:50,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:53,706 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2487 proven. 1437 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:53,707 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:11:53,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [132359454] [2022-11-19 07:11:53,707 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [132359454] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:11:53,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1147298814] [2022-11-19 07:11:53,707 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:11:53,707 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:11:53,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:11:53,708 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:11:53,710 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2022-11-19 07:11:53,950 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 37 check-sat command(s) [2022-11-19 07:11:53,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:11:53,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 839 conjuncts, 76 conjunts are in the unsatisfiable core [2022-11-19 07:11:53,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:11:56,671 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2592 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:56,671 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:11:58,694 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2592 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:58,694 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1147298814] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:11:58,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [19861717] [2022-11-19 07:11:58,695 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:11:58,695 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:11:58,695 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:11:58,695 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:11:58,695 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:11:58,787 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:11:59,696 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '70184#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:11:59,696 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:11:59,696 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:11:59,696 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 115 [2022-11-19 07:11:59,697 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712332927] [2022-11-19 07:11:59,697 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:11:59,697 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 115 states [2022-11-19 07:11:59,698 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:11:59,699 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2022-11-19 07:11:59,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3069, Invalid=12183, Unknown=0, NotChecked=0, Total=15252 [2022-11-19 07:11:59,700 INFO L87 Difference]: Start difference. First operand 227 states and 229 transitions. Second operand has 115 states, 115 states have (on average 3.2869565217391306) internal successors, (378), 115 states have internal predecessors, (378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:12:01,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:12:01,789 INFO L93 Difference]: Finished difference Result 491 states and 531 transitions. [2022-11-19 07:12:01,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2022-11-19 07:12:01,790 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 115 states have (on average 3.2869565217391306) internal successors, (378), 115 states have internal predecessors, (378), 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 226 [2022-11-19 07:12:01,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:12:01,791 INFO L225 Difference]: With dead ends: 491 [2022-11-19 07:12:01,791 INFO L226 Difference]: Without dead ends: 340 [2022-11-19 07:12:01,792 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 789 GetRequests, 558 SyntacticMatches, 72 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9874 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=5883, Invalid=19877, Unknown=0, NotChecked=0, Total=25760 [2022-11-19 07:12:01,793 INFO L413 NwaCegarLoop]: 76 mSDtfsCounter, 356 mSDsluCounter, 758 mSDsCounter, 0 mSdLazyCounter, 869 mSolverCounterSat, 316 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 356 SdHoareTripleChecker+Valid, 834 SdHoareTripleChecker+Invalid, 1185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 316 IncrementalHoareTripleChecker+Valid, 869 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-19 07:12:01,793 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [356 Valid, 834 Invalid, 1185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [316 Valid, 869 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-19 07:12:01,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2022-11-19 07:12:01,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 229. [2022-11-19 07:12:01,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 228 states have (on average 1.013157894736842) internal successors, (231), 228 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:12:01,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 231 transitions. [2022-11-19 07:12:01,820 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 231 transitions. Word has length 226 [2022-11-19 07:12:01,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:12:01,820 INFO L495 AbstractCegarLoop]: Abstraction has 229 states and 231 transitions. [2022-11-19 07:12:01,821 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 115 states, 115 states have (on average 3.2869565217391306) internal successors, (378), 115 states have internal predecessors, (378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:12:01,821 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 231 transitions. [2022-11-19 07:12:01,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2022-11-19 07:12:01,822 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:12:01,822 INFO L195 NwaCegarLoop]: trace histogram [38, 37, 37, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:12:01,831 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2022-11-19 07:12:02,028 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:12:02,028 INFO L420 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:12:02,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:12:02,029 INFO L85 PathProgramCache]: Analyzing trace with hash 1341390837, now seen corresponding path program 54 times [2022-11-19 07:12:02,029 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:12:02,029 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1848978204] [2022-11-19 07:12:02,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:12:02,029 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:12:02,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:12:03,742 INFO L134 CoverageAnalysis]: Checked inductivity of 3998 backedges. 1332 proven. 2666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:12:03,742 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:12:03,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1848978204] [2022-11-19 07:12:03,742 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1848978204] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:12:03,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [518578249] [2022-11-19 07:12:03,742 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:12:03,742 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:12:03,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:12:03,746 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:12:03,751 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2022-11-19 07:12:03,906 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:12:03,906 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:12:03,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 849 conjuncts, 80 conjunts are in the unsatisfiable core [2022-11-19 07:12:03,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:12:04,217 INFO L134 CoverageAnalysis]: Checked inductivity of 3998 backedges. 1406 proven. 2592 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:12:04,217 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:12:05,582 INFO L134 CoverageAnalysis]: Checked inductivity of 3998 backedges. 1406 proven. 2592 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:12:05,583 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [518578249] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:12:05,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [802659956] [2022-11-19 07:12:05,583 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:12:05,584 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:12:05,584 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:12:05,584 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:12:05,584 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:12:05,683 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:12:06,199 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '72728#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:12:06,199 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:12:06,199 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:12:06,200 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 43 [2022-11-19 07:12:06,200 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095255409] [2022-11-19 07:12:06,200 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:12:06,200 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-19 07:12:06,200 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:12:06,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-19 07:12:06,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=872, Invalid=1884, Unknown=0, NotChecked=0, Total=2756 [2022-11-19 07:12:06,202 INFO L87 Difference]: Start difference. First operand 229 states and 231 transitions. Second operand has 44 states, 44 states have (on average 5.659090909090909) internal successors, (249), 43 states have internal predecessors, (249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:12:07,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:12:07,155 INFO L93 Difference]: Finished difference Result 246 states and 249 transitions. [2022-11-19 07:12:07,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2022-11-19 07:12:07,156 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 5.659090909090909) internal successors, (249), 43 states have internal predecessors, (249), 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 228 [2022-11-19 07:12:07,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:12:07,157 INFO L225 Difference]: With dead ends: 246 [2022-11-19 07:12:07,157 INFO L226 Difference]: Without dead ends: 244 [2022-11-19 07:12:07,158 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 798 GetRequests, 635 SyntacticMatches, 72 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3904 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2597, Invalid=5959, Unknown=0, NotChecked=0, Total=8556 [2022-11-19 07:12:07,159 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 242 mSDsluCounter, 318 mSDsCounter, 0 mSdLazyCounter, 415 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 242 SdHoareTripleChecker+Valid, 364 SdHoareTripleChecker+Invalid, 458 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 415 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:12:07,159 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [242 Valid, 364 Invalid, 458 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 415 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:12:07,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2022-11-19 07:12:07,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 237. [2022-11-19 07:12:07,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 236 states have (on average 1.0127118644067796) internal successors, (239), 236 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:12:07,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 239 transitions. [2022-11-19 07:12:07,207 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 239 transitions. Word has length 228 [2022-11-19 07:12:07,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:12:07,207 INFO L495 AbstractCegarLoop]: Abstraction has 237 states and 239 transitions. [2022-11-19 07:12:07,208 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 5.659090909090909) internal successors, (249), 43 states have internal predecessors, (249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:12:07,208 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 239 transitions. [2022-11-19 07:12:07,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2022-11-19 07:12:07,209 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:12:07,209 INFO L195 NwaCegarLoop]: trace histogram [39, 38, 38, 38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:12:07,219 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2022-11-19 07:12:07,415 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:12:07,415 INFO L420 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:12:07,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:12:07,416 INFO L85 PathProgramCache]: Analyzing trace with hash 1724878043, now seen corresponding path program 55 times [2022-11-19 07:12:07,416 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:12:07,416 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2015706431] [2022-11-19 07:12:07,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:12:07,416 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:12:07,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:12:10,400 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 2777 proven. 1517 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:12:10,401 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:12:10,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2015706431] [2022-11-19 07:12:10,401 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2015706431] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:12:10,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1408924551] [2022-11-19 07:12:10,401 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:12:10,401 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:12:10,401 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:12:10,402 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:12:10,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2022-11-19 07:12:10,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:12:10,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 873 conjuncts, 78 conjunts are in the unsatisfiable core [2022-11-19 07:12:10,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:12:13,485 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 2886 proven. 1406 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:12:13,486 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:12:15,624 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 2886 proven. 1406 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:12:15,624 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1408924551] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:12:15,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1662821526] [2022-11-19 07:12:15,626 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:12:15,626 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:12:15,626 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:12:15,626 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:12:15,626 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:12:15,743 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:12:16,677 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '75064#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:12:16,677 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:12:16,677 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:12:16,677 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 78, 78] total 119 [2022-11-19 07:12:16,677 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1259831868] [2022-11-19 07:12:16,677 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:12:16,678 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 119 states [2022-11-19 07:12:16,678 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:12:16,679 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2022-11-19 07:12:16,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3267, Invalid=12989, Unknown=0, NotChecked=0, Total=16256 [2022-11-19 07:12:16,680 INFO L87 Difference]: Start difference. First operand 237 states and 239 transitions. Second operand has 119 states, 119 states have (on average 3.327731092436975) internal successors, (396), 119 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:12:19,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:12:19,123 INFO L93 Difference]: Finished difference Result 510 states and 551 transitions. [2022-11-19 07:12:19,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2022-11-19 07:12:19,123 INFO L78 Accepts]: Start accepts. Automaton has has 119 states, 119 states have (on average 3.327731092436975) internal successors, (396), 119 states have internal predecessors, (396), 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 236 [2022-11-19 07:12:19,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:12:19,125 INFO L225 Difference]: With dead ends: 510 [2022-11-19 07:12:19,125 INFO L226 Difference]: Without dead ends: 353 [2022-11-19 07:12:19,127 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 823 GetRequests, 585 SyntacticMatches, 74 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10529 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=6233, Invalid=21157, Unknown=0, NotChecked=0, Total=27390 [2022-11-19 07:12:19,127 INFO L413 NwaCegarLoop]: 78 mSDtfsCounter, 369 mSDsluCounter, 961 mSDsCounter, 0 mSdLazyCounter, 1092 mSolverCounterSat, 324 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 369 SdHoareTripleChecker+Valid, 1039 SdHoareTripleChecker+Invalid, 1416 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 324 IncrementalHoareTripleChecker+Valid, 1092 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 07:12:19,127 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [369 Valid, 1039 Invalid, 1416 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [324 Valid, 1092 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-19 07:12:19,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2022-11-19 07:12:19,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 239. [2022-11-19 07:12:19,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 238 states have (on average 1.0126050420168067) internal successors, (241), 238 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:12:19,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 241 transitions. [2022-11-19 07:12:19,156 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 241 transitions. Word has length 236 [2022-11-19 07:12:19,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:12:19,156 INFO L495 AbstractCegarLoop]: Abstraction has 239 states and 241 transitions. [2022-11-19 07:12:19,156 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 119 states, 119 states have (on average 3.327731092436975) internal successors, (396), 119 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:12:19,156 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 241 transitions. [2022-11-19 07:12:19,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 239 [2022-11-19 07:12:19,157 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:12:19,157 INFO L195 NwaCegarLoop]: trace histogram [39, 39, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:12:19,162 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2022-11-19 07:12:19,359 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2022-11-19 07:12:19,359 INFO L420 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:12:19,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:12:19,359 INFO L85 PathProgramCache]: Analyzing trace with hash -379402560, now seen corresponding path program 56 times [2022-11-19 07:12:19,359 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:12:19,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [616340471] [2022-11-19 07:12:19,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:12:19,360 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:12:19,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:12:22,428 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 2777 proven. 1593 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:12:22,428 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:12:22,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [616340471] [2022-11-19 07:12:22,428 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [616340471] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:12:22,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1567746381] [2022-11-19 07:12:22,429 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:12:22,429 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:12:22,429 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:12:22,430 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:12:22,436 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2022-11-19 07:12:22,691 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2022-11-19 07:12:22,692 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:12:22,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 883 conjuncts, 80 conjunts are in the unsatisfiable core [2022-11-19 07:12:22,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:12:25,690 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 2888 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:12:25,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:12:27,914 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 2888 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:12:27,915 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1567746381] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:12:27,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1327759867] [2022-11-19 07:12:27,916 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:12:27,916 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:12:27,916 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:12:27,916 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:12:27,916 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:12:28,002 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:12:28,961 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '77790#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:12:28,961 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:12:28,962 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:12:28,962 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80, 80] total 121 [2022-11-19 07:12:28,962 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785776836] [2022-11-19 07:12:28,962 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:12:28,962 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 121 states [2022-11-19 07:12:28,962 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:12:28,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2022-11-19 07:12:28,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3389, Invalid=13381, Unknown=0, NotChecked=0, Total=16770 [2022-11-19 07:12:28,964 INFO L87 Difference]: Start difference. First operand 239 states and 241 transitions. Second operand has 121 states, 121 states have (on average 3.2892561983471076) internal successors, (398), 121 states have internal predecessors, (398), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:12:31,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:12:31,286 INFO L93 Difference]: Finished difference Result 517 states and 559 transitions. [2022-11-19 07:12:31,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2022-11-19 07:12:31,286 INFO L78 Accepts]: Start accepts. Automaton has has 121 states, 121 states have (on average 3.2892561983471076) internal successors, (398), 121 states have internal predecessors, (398), 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 238 [2022-11-19 07:12:31,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:12:31,287 INFO L225 Difference]: With dead ends: 517 [2022-11-19 07:12:31,287 INFO L226 Difference]: Without dead ends: 358 [2022-11-19 07:12:31,289 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 831 GetRequests, 588 SyntacticMatches, 76 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10876 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=6511, Invalid=21881, Unknown=0, NotChecked=0, Total=28392 [2022-11-19 07:12:31,290 INFO L413 NwaCegarLoop]: 80 mSDtfsCounter, 356 mSDsluCounter, 815 mSDsCounter, 0 mSdLazyCounter, 938 mSolverCounterSat, 440 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 356 SdHoareTripleChecker+Valid, 895 SdHoareTripleChecker+Invalid, 1378 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 440 IncrementalHoareTripleChecker+Valid, 938 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-19 07:12:31,290 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [356 Valid, 895 Invalid, 1378 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [440 Valid, 938 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-19 07:12:31,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2022-11-19 07:12:31,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 241. [2022-11-19 07:12:31,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 240 states have (on average 1.0125) internal successors, (243), 240 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:12:31,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 243 transitions. [2022-11-19 07:12:31,341 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 243 transitions. Word has length 238 [2022-11-19 07:12:31,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:12:31,341 INFO L495 AbstractCegarLoop]: Abstraction has 241 states and 243 transitions. [2022-11-19 07:12:31,341 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 121 states, 121 states have (on average 3.2892561983471076) internal successors, (398), 121 states have internal predecessors, (398), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:12:31,342 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 243 transitions. [2022-11-19 07:12:31,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2022-11-19 07:12:31,343 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:12:31,343 INFO L195 NwaCegarLoop]: trace histogram [40, 39, 39, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:12:31,354 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2022-11-19 07:12:31,549 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2022-11-19 07:12:31,549 INFO L420 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:12:31,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:12:31,549 INFO L85 PathProgramCache]: Analyzing trace with hash 336534373, now seen corresponding path program 57 times [2022-11-19 07:12:31,549 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:12:31,549 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1489801372] [2022-11-19 07:12:31,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:12:31,550 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:12:31,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:12:33,431 INFO L134 CoverageAnalysis]: Checked inductivity of 4448 backedges. 1482 proven. 2966 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:12:33,431 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:12:33,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1489801372] [2022-11-19 07:12:33,432 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1489801372] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:12:33,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1510631924] [2022-11-19 07:12:33,432 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:12:33,432 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:12:33,432 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:12:33,433 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:12:33,435 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2022-11-19 07:12:33,600 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:12:33,601 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:12:33,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 893 conjuncts, 84 conjunts are in the unsatisfiable core [2022-11-19 07:12:33,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:12:33,946 INFO L134 CoverageAnalysis]: Checked inductivity of 4448 backedges. 1560 proven. 2888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:12:33,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:12:35,459 INFO L134 CoverageAnalysis]: Checked inductivity of 4448 backedges. 1560 proven. 2888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:12:35,460 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1510631924] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:12:35,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [440444920] [2022-11-19 07:12:35,460 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:12:35,460 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:12:35,461 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:12:35,461 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:12:35,461 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:12:35,556 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:12:36,087 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '80468#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:12:36,087 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:12:36,087 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:12:36,087 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 45 [2022-11-19 07:12:36,087 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [471082159] [2022-11-19 07:12:36,087 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:12:36,088 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-19 07:12:36,088 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:12:36,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-19 07:12:36,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=955, Invalid=2015, Unknown=0, NotChecked=0, Total=2970 [2022-11-19 07:12:36,089 INFO L87 Difference]: Start difference. First operand 241 states and 243 transitions. Second operand has 46 states, 46 states have (on average 5.673913043478261) internal successors, (261), 45 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:12:37,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:12:37,070 INFO L93 Difference]: Finished difference Result 258 states and 261 transitions. [2022-11-19 07:12:37,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2022-11-19 07:12:37,070 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 5.673913043478261) internal successors, (261), 45 states have internal predecessors, (261), 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 240 [2022-11-19 07:12:37,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:12:37,072 INFO L225 Difference]: With dead ends: 258 [2022-11-19 07:12:37,072 INFO L226 Difference]: Without dead ends: 256 [2022-11-19 07:12:37,073 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 840 GetRequests, 669 SyntacticMatches, 76 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4268 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=2850, Invalid=6462, Unknown=0, NotChecked=0, Total=9312 [2022-11-19 07:12:37,073 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 379 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 362 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 379 SdHoareTripleChecker+Valid, 303 SdHoareTripleChecker+Invalid, 407 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 362 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:12:37,073 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [379 Valid, 303 Invalid, 407 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 362 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:12:37,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2022-11-19 07:12:37,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 249. [2022-11-19 07:12:37,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 248 states have (on average 1.0120967741935485) internal successors, (251), 248 states have internal predecessors, (251), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:12:37,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 251 transitions. [2022-11-19 07:12:37,115 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 251 transitions. Word has length 240 [2022-11-19 07:12:37,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:12:37,116 INFO L495 AbstractCegarLoop]: Abstraction has 249 states and 251 transitions. [2022-11-19 07:12:37,116 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 5.673913043478261) internal successors, (261), 45 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:12:37,116 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 251 transitions. [2022-11-19 07:12:37,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 249 [2022-11-19 07:12:37,118 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:12:37,118 INFO L195 NwaCegarLoop]: trace histogram [41, 40, 40, 40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:12:37,124 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2022-11-19 07:12:37,324 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:12:37,324 INFO L420 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:12:37,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:12:37,324 INFO L85 PathProgramCache]: Analyzing trace with hash -175097781, now seen corresponding path program 58 times [2022-11-19 07:12:37,324 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:12:37,324 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [658653284] [2022-11-19 07:12:37,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:12:37,325 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:12:37,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:12:40,684 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 3083 proven. 1677 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:12:40,684 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:12:40,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [658653284] [2022-11-19 07:12:40,684 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [658653284] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:12:40,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [865266120] [2022-11-19 07:12:40,685 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:12:40,685 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:12:40,685 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:12:40,686 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:12:40,688 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2022-11-19 07:12:40,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:12:40,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 917 conjuncts, 82 conjunts are in the unsatisfiable core [2022-11-19 07:12:40,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:12:44,032 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 3198 proven. 1560 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:12:44,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:12:46,345 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 3198 proven. 1560 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:12:46,346 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [865266120] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:12:46,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1396412828] [2022-11-19 07:12:46,347 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:12:46,347 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:12:46,347 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:12:46,347 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:12:46,347 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:12:46,456 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:12:47,462 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '82922#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:12:47,462 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:12:47,463 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:12:47,463 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 82, 82] total 125 [2022-11-19 07:12:47,463 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [312043305] [2022-11-19 07:12:47,463 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:12:47,463 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 125 states [2022-11-19 07:12:47,463 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:12:47,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2022-11-19 07:12:47,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3597, Invalid=14225, Unknown=0, NotChecked=0, Total=17822 [2022-11-19 07:12:47,465 INFO L87 Difference]: Start difference. First operand 249 states and 251 transitions. Second operand has 125 states, 125 states have (on average 3.328) internal successors, (416), 125 states have internal predecessors, (416), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:12:49,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:12:49,889 INFO L93 Difference]: Finished difference Result 536 states and 579 transitions. [2022-11-19 07:12:49,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2022-11-19 07:12:49,889 INFO L78 Accepts]: Start accepts. Automaton has has 125 states, 125 states have (on average 3.328) internal successors, (416), 125 states have internal predecessors, (416), 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 248 [2022-11-19 07:12:49,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:12:49,890 INFO L225 Difference]: With dead ends: 536 [2022-11-19 07:12:49,890 INFO L226 Difference]: Without dead ends: 371 [2022-11-19 07:12:49,892 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 865 GetRequests, 615 SyntacticMatches, 78 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11563 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=6879, Invalid=23223, Unknown=0, NotChecked=0, Total=30102 [2022-11-19 07:12:49,892 INFO L413 NwaCegarLoop]: 82 mSDtfsCounter, 415 mSDsluCounter, 767 mSDsCounter, 0 mSdLazyCounter, 902 mSolverCounterSat, 394 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 415 SdHoareTripleChecker+Valid, 849 SdHoareTripleChecker+Invalid, 1296 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 394 IncrementalHoareTripleChecker+Valid, 902 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-19 07:12:49,892 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [415 Valid, 849 Invalid, 1296 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [394 Valid, 902 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-19 07:12:49,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2022-11-19 07:12:49,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 251. [2022-11-19 07:12:49,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 250 states have (on average 1.012) internal successors, (253), 250 states have internal predecessors, (253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:12:49,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 253 transitions. [2022-11-19 07:12:49,924 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 253 transitions. Word has length 248 [2022-11-19 07:12:49,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:12:49,925 INFO L495 AbstractCegarLoop]: Abstraction has 251 states and 253 transitions. [2022-11-19 07:12:49,925 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 125 states, 125 states have (on average 3.328) internal successors, (416), 125 states have internal predecessors, (416), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:12:49,925 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 253 transitions. [2022-11-19 07:12:49,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2022-11-19 07:12:49,926 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:12:49,926 INFO L195 NwaCegarLoop]: trace histogram [41, 41, 40, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:12:49,931 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2022-11-19 07:12:50,126 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:12:50,126 INFO L420 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:12:50,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:12:50,127 INFO L85 PathProgramCache]: Analyzing trace with hash -1152728400, now seen corresponding path program 59 times [2022-11-19 07:12:50,127 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:12:50,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [452916562] [2022-11-19 07:12:50,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:12:50,127 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:12:50,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:12:53,519 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 3083 proven. 1757 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:12:53,519 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:12:53,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [452916562] [2022-11-19 07:12:53,519 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [452916562] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:12:53,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [315604293] [2022-11-19 07:12:53,519 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:12:53,519 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:12:53,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:12:53,520 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:12:53,522 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2022-11-19 07:12:53,793 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2022-11-19 07:12:53,794 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:12:53,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 927 conjuncts, 84 conjunts are in the unsatisfiable core [2022-11-19 07:12:53,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:12:57,060 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 3200 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:12:57,061 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:12:59,508 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 3200 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:12:59,508 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [315604293] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:12:59,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1160456158] [2022-11-19 07:12:59,509 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:12:59,509 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:12:59,509 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:12:59,510 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:12:59,510 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:12:59,598 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:13:00,579 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '85786#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:13:00,579 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:13:00,579 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:13:00,579 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84, 84] total 127 [2022-11-19 07:13:00,579 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095892408] [2022-11-19 07:13:00,579 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:13:00,580 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 127 states [2022-11-19 07:13:00,580 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:13:00,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2022-11-19 07:13:00,582 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3725, Invalid=14635, Unknown=0, NotChecked=0, Total=18360 [2022-11-19 07:13:00,582 INFO L87 Difference]: Start difference. First operand 251 states and 253 transitions. Second operand has 127 states, 127 states have (on average 3.2913385826771653) internal successors, (418), 127 states have internal predecessors, (418), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:13:03,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:13:03,106 INFO L93 Difference]: Finished difference Result 543 states and 587 transitions. [2022-11-19 07:13:03,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2022-11-19 07:13:03,107 INFO L78 Accepts]: Start accepts. Automaton has has 127 states, 127 states have (on average 3.2913385826771653) internal successors, (418), 127 states have internal predecessors, (418), 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 250 [2022-11-19 07:13:03,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:13:03,108 INFO L225 Difference]: With dead ends: 543 [2022-11-19 07:13:03,109 INFO L226 Difference]: Without dead ends: 376 [2022-11-19 07:13:03,111 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 873 GetRequests, 618 SyntacticMatches, 80 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11926 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=7171, Invalid=23981, Unknown=0, NotChecked=0, Total=31152 [2022-11-19 07:13:03,111 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 363 mSDsluCounter, 897 mSDsCounter, 0 mSdLazyCounter, 1019 mSolverCounterSat, 333 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 363 SdHoareTripleChecker+Valid, 981 SdHoareTripleChecker+Invalid, 1352 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 333 IncrementalHoareTripleChecker+Valid, 1019 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-19 07:13:03,112 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [363 Valid, 981 Invalid, 1352 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [333 Valid, 1019 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-19 07:13:03,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2022-11-19 07:13:03,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 253. [2022-11-19 07:13:03,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 252 states have (on average 1.0119047619047619) internal successors, (255), 252 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:13:03,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 255 transitions. [2022-11-19 07:13:03,167 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 255 transitions. Word has length 250 [2022-11-19 07:13:03,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:13:03,167 INFO L495 AbstractCegarLoop]: Abstraction has 253 states and 255 transitions. [2022-11-19 07:13:03,168 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 127 states, 127 states have (on average 3.2913385826771653) internal successors, (418), 127 states have internal predecessors, (418), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:13:03,168 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 255 transitions. [2022-11-19 07:13:03,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2022-11-19 07:13:03,169 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:13:03,169 INFO L195 NwaCegarLoop]: trace histogram [42, 41, 41, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:13:03,179 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Forceful destruction successful, exit code 0 [2022-11-19 07:13:03,375 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:13:03,376 INFO L420 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:13:03,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:13:03,376 INFO L85 PathProgramCache]: Analyzing trace with hash -57915435, now seen corresponding path program 60 times [2022-11-19 07:13:03,376 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:13:03,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141964346] [2022-11-19 07:13:03,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:13:03,377 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:13:03,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:13:05,458 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 1640 proven. 3282 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:13:05,458 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:13:05,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141964346] [2022-11-19 07:13:05,458 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [141964346] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:13:05,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1290667946] [2022-11-19 07:13:05,458 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:13:05,458 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:13:05,459 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:13:05,459 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:13:05,461 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2022-11-19 07:13:05,634 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:13:05,634 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:13:05,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 937 conjuncts, 88 conjunts are in the unsatisfiable core [2022-11-19 07:13:05,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:13:05,964 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 1722 proven. 3200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:13:05,964 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:13:07,613 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 1722 proven. 3200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:13:07,613 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1290667946] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:13:07,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [350354475] [2022-11-19 07:13:07,614 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:13:07,614 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:13:07,614 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:13:07,615 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:13:07,615 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:13:07,725 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:13:08,302 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '88598#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:13:08,302 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:13:08,302 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:13:08,302 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 47 [2022-11-19 07:13:08,303 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483071712] [2022-11-19 07:13:08,303 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:13:08,303 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-19 07:13:08,304 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:13:08,304 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-19 07:13:08,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1042, Invalid=2150, Unknown=0, NotChecked=0, Total=3192 [2022-11-19 07:13:08,305 INFO L87 Difference]: Start difference. First operand 253 states and 255 transitions. Second operand has 48 states, 48 states have (on average 5.6875) internal successors, (273), 47 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:13:09,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:13:09,372 INFO L93 Difference]: Finished difference Result 270 states and 273 transitions. [2022-11-19 07:13:09,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2022-11-19 07:13:09,372 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 5.6875) internal successors, (273), 47 states have internal predecessors, (273), 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 252 [2022-11-19 07:13:09,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:13:09,374 INFO L225 Difference]: With dead ends: 270 [2022-11-19 07:13:09,374 INFO L226 Difference]: Without dead ends: 268 [2022-11-19 07:13:09,375 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 882 GetRequests, 703 SyntacticMatches, 80 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4648 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=3115, Invalid=6985, Unknown=0, NotChecked=0, Total=10100 [2022-11-19 07:13:09,375 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 357 mSDsluCounter, 326 mSDsCounter, 0 mSdLazyCounter, 429 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 357 SdHoareTripleChecker+Valid, 376 SdHoareTripleChecker+Invalid, 476 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 429 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:13:09,375 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [357 Valid, 376 Invalid, 476 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 429 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:13:09,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2022-11-19 07:13:09,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 261. [2022-11-19 07:13:09,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 260 states have (on average 1.0115384615384615) internal successors, (263), 260 states have internal predecessors, (263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:13:09,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 263 transitions. [2022-11-19 07:13:09,410 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 263 transitions. Word has length 252 [2022-11-19 07:13:09,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:13:09,411 INFO L495 AbstractCegarLoop]: Abstraction has 261 states and 263 transitions. [2022-11-19 07:13:09,411 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 5.6875) internal successors, (273), 47 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:13:09,411 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 263 transitions. [2022-11-19 07:13:09,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 261 [2022-11-19 07:13:09,412 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:13:09,412 INFO L195 NwaCegarLoop]: trace histogram [43, 42, 42, 42, 42, 41, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:13:09,417 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2022-11-19 07:13:09,615 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:13:09,615 INFO L420 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:13:09,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:13:09,615 INFO L85 PathProgramCache]: Analyzing trace with hash -1307446085, now seen corresponding path program 61 times [2022-11-19 07:13:09,615 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:13:09,616 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1982991159] [2022-11-19 07:13:09,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:13:09,616 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:13:09,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:13:13,225 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 3405 proven. 1845 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:13:13,225 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:13:13,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1982991159] [2022-11-19 07:13:13,225 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1982991159] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:13:13,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [808401810] [2022-11-19 07:13:13,225 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:13:13,225 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:13:13,225 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:13:13,228 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:13:13,229 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2022-11-19 07:13:13,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:13:13,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 961 conjuncts, 86 conjunts are in the unsatisfiable core [2022-11-19 07:13:13,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:13:16,877 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 3526 proven. 1722 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:13:16,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:13:19,443 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 3526 proven. 1722 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:13:19,443 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [808401810] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:13:19,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [68823917] [2022-11-19 07:13:19,444 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:13:19,444 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:13:19,444 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:13:19,444 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:13:19,444 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:13:19,539 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:13:20,543 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '91170#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:13:20,543 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:13:20,543 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:13:20,544 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 86, 86] total 131 [2022-11-19 07:13:20,544 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636653130] [2022-11-19 07:13:20,544 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:13:20,544 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 131 states [2022-11-19 07:13:20,544 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:13:20,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2022-11-19 07:13:20,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3943, Invalid=15517, Unknown=0, NotChecked=0, Total=19460 [2022-11-19 07:13:20,546 INFO L87 Difference]: Start difference. First operand 261 states and 263 transitions. Second operand has 131 states, 131 states have (on average 3.3282442748091605) internal successors, (436), 131 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:13:23,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:13:23,222 INFO L93 Difference]: Finished difference Result 562 states and 607 transitions. [2022-11-19 07:13:23,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2022-11-19 07:13:23,222 INFO L78 Accepts]: Start accepts. Automaton has has 131 states, 131 states have (on average 3.3282442748091605) internal successors, (436), 131 states have internal predecessors, (436), 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 260 [2022-11-19 07:13:23,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:13:23,224 INFO L225 Difference]: With dead ends: 562 [2022-11-19 07:13:23,225 INFO L226 Difference]: Without dead ends: 389 [2022-11-19 07:13:23,227 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 907 GetRequests, 645 SyntacticMatches, 82 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12645 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=7557, Invalid=25385, Unknown=0, NotChecked=0, Total=32942 [2022-11-19 07:13:23,227 INFO L413 NwaCegarLoop]: 86 mSDtfsCounter, 418 mSDsluCounter, 809 mSDsCounter, 0 mSdLazyCounter, 936 mSolverCounterSat, 494 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 418 SdHoareTripleChecker+Valid, 895 SdHoareTripleChecker+Invalid, 1430 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 494 IncrementalHoareTripleChecker+Valid, 936 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-19 07:13:23,227 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [418 Valid, 895 Invalid, 1430 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [494 Valid, 936 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-19 07:13:23,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2022-11-19 07:13:23,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 263. [2022-11-19 07:13:23,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 262 states have (on average 1.0114503816793894) internal successors, (265), 262 states have internal predecessors, (265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:13:23,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 265 transitions. [2022-11-19 07:13:23,270 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 265 transitions. Word has length 260 [2022-11-19 07:13:23,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:13:23,271 INFO L495 AbstractCegarLoop]: Abstraction has 263 states and 265 transitions. [2022-11-19 07:13:23,271 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 131 states, 131 states have (on average 3.3282442748091605) internal successors, (436), 131 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:13:23,271 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 265 transitions. [2022-11-19 07:13:23,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2022-11-19 07:13:23,272 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:13:23,273 INFO L195 NwaCegarLoop]: trace histogram [43, 43, 42, 42, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:13:23,279 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Forceful destruction successful, exit code 0 [2022-11-19 07:13:23,479 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable63 [2022-11-19 07:13:23,479 INFO L420 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:13:23,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:13:23,479 INFO L85 PathProgramCache]: Analyzing trace with hash 1811877792, now seen corresponding path program 62 times [2022-11-19 07:13:23,479 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:13:23,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [793624532] [2022-11-19 07:13:23,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:13:23,480 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:13:23,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:13:27,191 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 3405 proven. 1929 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:13:27,191 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:13:27,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [793624532] [2022-11-19 07:13:27,192 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [793624532] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:13:27,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [168800397] [2022-11-19 07:13:27,192 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:13:27,192 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:13:27,192 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:13:27,193 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:13:27,195 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2022-11-19 07:13:27,488 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 43 check-sat command(s) [2022-11-19 07:13:27,488 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:13:27,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 971 conjuncts, 88 conjunts are in the unsatisfiable core [2022-11-19 07:13:27,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:13:31,037 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 3528 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:13:31,038 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:13:33,685 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 3528 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:13:33,685 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [168800397] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:13:33,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2062836291] [2022-11-19 07:13:33,686 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:13:33,686 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:13:33,686 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:13:33,686 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:13:33,686 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:13:33,796 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:13:34,810 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '94172#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:13:34,810 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:13:34,810 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:13:34,810 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88, 88] total 133 [2022-11-19 07:13:34,810 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340580054] [2022-11-19 07:13:34,811 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:13:34,811 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 133 states [2022-11-19 07:13:34,811 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:13:34,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2022-11-19 07:13:34,813 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4077, Invalid=15945, Unknown=0, NotChecked=0, Total=20022 [2022-11-19 07:13:34,813 INFO L87 Difference]: Start difference. First operand 263 states and 265 transitions. Second operand has 133 states, 133 states have (on average 3.293233082706767) internal successors, (438), 133 states have internal predecessors, (438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:13:37,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:13:37,569 INFO L93 Difference]: Finished difference Result 569 states and 615 transitions. [2022-11-19 07:13:37,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2022-11-19 07:13:37,569 INFO L78 Accepts]: Start accepts. Automaton has has 133 states, 133 states have (on average 3.293233082706767) internal successors, (438), 133 states have internal predecessors, (438), 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 262 [2022-11-19 07:13:37,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:13:37,571 INFO L225 Difference]: With dead ends: 569 [2022-11-19 07:13:37,571 INFO L226 Difference]: Without dead ends: 394 [2022-11-19 07:13:37,572 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 915 GetRequests, 648 SyntacticMatches, 84 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13024 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=7863, Invalid=26177, Unknown=0, NotChecked=0, Total=34040 [2022-11-19 07:13:37,573 INFO L413 NwaCegarLoop]: 88 mSDtfsCounter, 467 mSDsluCounter, 877 mSDsCounter, 0 mSdLazyCounter, 1014 mSolverCounterSat, 479 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 467 SdHoareTripleChecker+Valid, 965 SdHoareTripleChecker+Invalid, 1493 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 479 IncrementalHoareTripleChecker+Valid, 1014 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 07:13:37,573 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [467 Valid, 965 Invalid, 1493 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [479 Valid, 1014 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-19 07:13:37,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2022-11-19 07:13:37,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 265. [2022-11-19 07:13:37,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 264 states have (on average 1.0113636363636365) internal successors, (267), 264 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:13:37,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 267 transitions. [2022-11-19 07:13:37,609 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 267 transitions. Word has length 262 [2022-11-19 07:13:37,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:13:37,609 INFO L495 AbstractCegarLoop]: Abstraction has 265 states and 267 transitions. [2022-11-19 07:13:37,609 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 133 states, 133 states have (on average 3.293233082706767) internal successors, (438), 133 states have internal predecessors, (438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:13:37,610 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 267 transitions. [2022-11-19 07:13:37,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2022-11-19 07:13:37,610 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:13:37,611 INFO L195 NwaCegarLoop]: trace histogram [44, 43, 43, 42, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:13:37,616 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2022-11-19 07:13:37,811 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:13:37,811 INFO L420 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:13:37,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:13:37,812 INFO L85 PathProgramCache]: Analyzing trace with hash 1594950981, now seen corresponding path program 63 times [2022-11-19 07:13:37,812 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:13:37,812 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1034212641] [2022-11-19 07:13:37,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:13:37,812 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:13:37,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:13:40,047 INFO L134 CoverageAnalysis]: Checked inductivity of 5420 backedges. 1806 proven. 3614 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:13:40,047 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:13:40,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1034212641] [2022-11-19 07:13:40,049 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1034212641] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:13:40,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1030465181] [2022-11-19 07:13:40,049 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:13:40,049 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:13:40,049 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:13:40,051 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:13:40,053 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2022-11-19 07:13:40,233 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:13:40,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:13:40,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 981 conjuncts, 92 conjunts are in the unsatisfiable core [2022-11-19 07:13:40,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:13:40,578 INFO L134 CoverageAnalysis]: Checked inductivity of 5420 backedges. 1892 proven. 3528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:13:40,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:13:42,373 INFO L134 CoverageAnalysis]: Checked inductivity of 5420 backedges. 1892 proven. 3528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:13:42,373 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1030465181] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:13:42,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [425887686] [2022-11-19 07:13:42,374 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:13:42,374 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:13:42,375 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:13:42,375 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:13:42,375 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:13:42,481 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:13:43,035 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '97118#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:13:43,035 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:13:43,035 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:13:43,036 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 49 [2022-11-19 07:13:43,036 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076480269] [2022-11-19 07:13:43,036 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:13:43,036 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-19 07:13:43,036 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:13:43,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-19 07:13:43,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1133, Invalid=2289, Unknown=0, NotChecked=0, Total=3422 [2022-11-19 07:13:43,037 INFO L87 Difference]: Start difference. First operand 265 states and 267 transitions. Second operand has 50 states, 50 states have (on average 5.7) internal successors, (285), 49 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:13:44,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:13:44,171 INFO L93 Difference]: Finished difference Result 282 states and 285 transitions. [2022-11-19 07:13:44,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2022-11-19 07:13:44,171 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 5.7) internal successors, (285), 49 states have internal predecessors, (285), 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 264 [2022-11-19 07:13:44,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:13:44,173 INFO L225 Difference]: With dead ends: 282 [2022-11-19 07:13:44,173 INFO L226 Difference]: Without dead ends: 280 [2022-11-19 07:13:44,174 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 924 GetRequests, 737 SyntacticMatches, 84 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5044 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=3392, Invalid=7528, Unknown=0, NotChecked=0, Total=10920 [2022-11-19 07:13:44,174 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 506 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 407 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 506 SdHoareTripleChecker+Valid, 334 SdHoareTripleChecker+Invalid, 456 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 407 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:13:44,174 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [506 Valid, 334 Invalid, 456 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 407 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:13:44,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2022-11-19 07:13:44,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 273. [2022-11-19 07:13:44,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 273 states, 272 states have (on average 1.0110294117647058) internal successors, (275), 272 states have internal predecessors, (275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:13:44,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 275 transitions. [2022-11-19 07:13:44,220 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 275 transitions. Word has length 264 [2022-11-19 07:13:44,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:13:44,221 INFO L495 AbstractCegarLoop]: Abstraction has 273 states and 275 transitions. [2022-11-19 07:13:44,221 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 5.7) internal successors, (285), 49 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:13:44,221 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 275 transitions. [2022-11-19 07:13:44,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 273 [2022-11-19 07:13:44,222 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:13:44,222 INFO L195 NwaCegarLoop]: trace histogram [45, 44, 44, 44, 44, 43, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:13:44,228 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2022-11-19 07:13:44,427 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:13:44,427 INFO L420 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:13:44,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:13:44,427 INFO L85 PathProgramCache]: Analyzing trace with hash -1267056085, now seen corresponding path program 64 times [2022-11-19 07:13:44,427 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:13:44,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1432948927] [2022-11-19 07:13:44,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:13:44,428 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:13:44,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:13:48,418 INFO L134 CoverageAnalysis]: Checked inductivity of 5764 backedges. 3743 proven. 2021 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:13:48,418 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:13:48,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1432948927] [2022-11-19 07:13:48,418 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1432948927] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:13:48,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [862139214] [2022-11-19 07:13:48,419 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:13:48,419 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:13:48,419 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:13:48,423 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:13:48,427 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2022-11-19 07:13:48,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:13:48,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 1005 conjuncts, 90 conjunts are in the unsatisfiable core [2022-11-19 07:13:48,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:13:52,358 INFO L134 CoverageAnalysis]: Checked inductivity of 5764 backedges. 3870 proven. 1892 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:13:52,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:13:55,164 INFO L134 CoverageAnalysis]: Checked inductivity of 5764 backedges. 3870 proven. 1892 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:13:55,164 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [862139214] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:13:55,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [398346305] [2022-11-19 07:13:55,165 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:13:55,165 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:13:55,166 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:13:55,166 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:13:55,166 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:13:55,266 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:13:56,322 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '99808#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:13:56,322 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:13:56,322 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:13:56,323 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 90, 90] total 137 [2022-11-19 07:13:56,323 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [345498566] [2022-11-19 07:13:56,323 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:13:56,324 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 137 states [2022-11-19 07:13:56,324 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:13:56,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2022-11-19 07:13:56,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4305, Invalid=16865, Unknown=0, NotChecked=0, Total=21170 [2022-11-19 07:13:56,326 INFO L87 Difference]: Start difference. First operand 273 states and 275 transitions. Second operand has 137 states, 137 states have (on average 3.3284671532846715) internal successors, (456), 137 states have internal predecessors, (456), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:13:59,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:13:59,269 INFO L93 Difference]: Finished difference Result 588 states and 635 transitions. [2022-11-19 07:13:59,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2022-11-19 07:13:59,269 INFO L78 Accepts]: Start accepts. Automaton has has 137 states, 137 states have (on average 3.3284671532846715) internal successors, (456), 137 states have internal predecessors, (456), 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 272 [2022-11-19 07:13:59,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:13:59,270 INFO L225 Difference]: With dead ends: 588 [2022-11-19 07:13:59,271 INFO L226 Difference]: Without dead ends: 407 [2022-11-19 07:13:59,273 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 949 GetRequests, 675 SyntacticMatches, 86 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13775 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=8267, Invalid=27643, Unknown=0, NotChecked=0, Total=35910 [2022-11-19 07:13:59,273 INFO L413 NwaCegarLoop]: 90 mSDtfsCounter, 385 mSDsluCounter, 946 mSDsCounter, 0 mSdLazyCounter, 1084 mSolverCounterSat, 400 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 385 SdHoareTripleChecker+Valid, 1036 SdHoareTripleChecker+Invalid, 1484 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 400 IncrementalHoareTripleChecker+Valid, 1084 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 07:13:59,273 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [385 Valid, 1036 Invalid, 1484 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [400 Valid, 1084 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-19 07:13:59,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 407 states. [2022-11-19 07:13:59,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 407 to 275. [2022-11-19 07:13:59,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 275 states, 274 states have (on average 1.010948905109489) internal successors, (277), 274 states have internal predecessors, (277), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:13:59,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 277 transitions. [2022-11-19 07:13:59,330 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 277 transitions. Word has length 272 [2022-11-19 07:13:59,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:13:59,330 INFO L495 AbstractCegarLoop]: Abstraction has 275 states and 277 transitions. [2022-11-19 07:13:59,330 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 137 states, 137 states have (on average 3.3284671532846715) internal successors, (456), 137 states have internal predecessors, (456), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:13:59,331 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 277 transitions. [2022-11-19 07:13:59,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 275 [2022-11-19 07:13:59,331 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:13:59,332 INFO L195 NwaCegarLoop]: trace histogram [45, 45, 44, 44, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:13:59,337 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2022-11-19 07:13:59,532 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:13:59,532 INFO L420 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:13:59,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:13:59,532 INFO L85 PathProgramCache]: Analyzing trace with hash -1664799344, now seen corresponding path program 65 times [2022-11-19 07:13:59,533 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:13:59,533 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387362819] [2022-11-19 07:13:59,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:13:59,533 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:13:59,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:14:03,683 INFO L134 CoverageAnalysis]: Checked inductivity of 5852 backedges. 3743 proven. 2109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:14:03,683 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:14:03,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [387362819] [2022-11-19 07:14:03,683 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [387362819] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:14:03,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1800614245] [2022-11-19 07:14:03,684 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:14:03,684 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:14:03,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:14:03,685 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:14:03,687 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2022-11-19 07:14:03,994 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2022-11-19 07:14:03,994 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:14:04,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 1015 conjuncts, 92 conjunts are in the unsatisfiable core [2022-11-19 07:14:04,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:14:07,881 INFO L134 CoverageAnalysis]: Checked inductivity of 5852 backedges. 3872 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:14:07,881 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:14:10,754 INFO L134 CoverageAnalysis]: Checked inductivity of 5852 backedges. 3872 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:14:10,754 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1800614245] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:14:10,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [688696631] [2022-11-19 07:14:10,755 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:14:10,755 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:14:10,755 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:14:10,755 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:14:10,755 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:14:10,880 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:14:11,929 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '102948#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:14:11,929 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:14:11,929 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:14:11,929 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92, 92] total 139 [2022-11-19 07:14:11,929 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [787097096] [2022-11-19 07:14:11,929 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:14:11,930 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 139 states [2022-11-19 07:14:11,930 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:14:11,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2022-11-19 07:14:11,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4445, Invalid=17311, Unknown=0, NotChecked=0, Total=21756 [2022-11-19 07:14:11,932 INFO L87 Difference]: Start difference. First operand 275 states and 277 transitions. Second operand has 139 states, 139 states have (on average 3.2949640287769784) internal successors, (458), 139 states have internal predecessors, (458), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:14:14,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:14:14,932 INFO L93 Difference]: Finished difference Result 595 states and 643 transitions. [2022-11-19 07:14:14,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2022-11-19 07:14:14,932 INFO L78 Accepts]: Start accepts. Automaton has has 139 states, 139 states have (on average 3.2949640287769784) internal successors, (458), 139 states have internal predecessors, (458), 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 274 [2022-11-19 07:14:14,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:14:14,935 INFO L225 Difference]: With dead ends: 595 [2022-11-19 07:14:14,935 INFO L226 Difference]: Without dead ends: 412 [2022-11-19 07:14:14,936 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 957 GetRequests, 678 SyntacticMatches, 88 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14170 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=8587, Invalid=28469, Unknown=0, NotChecked=0, Total=37056 [2022-11-19 07:14:14,937 INFO L413 NwaCegarLoop]: 92 mSDtfsCounter, 390 mSDsluCounter, 999 mSDsCounter, 0 mSdLazyCounter, 1138 mSolverCounterSat, 358 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 390 SdHoareTripleChecker+Valid, 1091 SdHoareTripleChecker+Invalid, 1496 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 358 IncrementalHoareTripleChecker+Valid, 1138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 07:14:14,937 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [390 Valid, 1091 Invalid, 1496 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [358 Valid, 1138 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-19 07:14:14,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 412 states. [2022-11-19 07:14:15,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 412 to 277. [2022-11-19 07:14:15,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 277 states, 276 states have (on average 1.0108695652173914) internal successors, (279), 276 states have internal predecessors, (279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:14:15,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 279 transitions. [2022-11-19 07:14:15,003 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 279 transitions. Word has length 274 [2022-11-19 07:14:15,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:14:15,003 INFO L495 AbstractCegarLoop]: Abstraction has 277 states and 279 transitions. [2022-11-19 07:14:15,004 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 139 states, 139 states have (on average 3.2949640287769784) internal successors, (458), 139 states have internal predecessors, (458), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:14:15,004 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 279 transitions. [2022-11-19 07:14:15,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2022-11-19 07:14:15,005 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:14:15,005 INFO L195 NwaCegarLoop]: trace histogram [46, 45, 45, 44, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:14:15,011 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Ended with exit code 0 [2022-11-19 07:14:15,211 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:14:15,211 INFO L420 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:14:15,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:14:15,211 INFO L85 PathProgramCache]: Analyzing trace with hash -1643981899, now seen corresponding path program 66 times [2022-11-19 07:14:15,211 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:14:15,211 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1570074796] [2022-11-19 07:14:15,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:14:15,212 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:14:15,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:14:17,764 INFO L134 CoverageAnalysis]: Checked inductivity of 5942 backedges. 1980 proven. 3962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:14:17,764 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:14:17,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1570074796] [2022-11-19 07:14:17,765 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1570074796] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:14:17,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1146393477] [2022-11-19 07:14:17,765 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:14:17,765 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:14:17,765 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:14:17,766 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:14:17,770 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2022-11-19 07:14:17,957 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:14:17,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:14:17,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 1025 conjuncts, 96 conjunts are in the unsatisfiable core [2022-11-19 07:14:17,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:14:18,314 INFO L134 CoverageAnalysis]: Checked inductivity of 5942 backedges. 2070 proven. 3872 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:14:18,314 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:14:20,249 INFO L134 CoverageAnalysis]: Checked inductivity of 5942 backedges. 2070 proven. 3872 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:14:20,249 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1146393477] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:14:20,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [365488556] [2022-11-19 07:14:20,250 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:14:20,250 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:14:20,251 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:14:20,251 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:14:20,251 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:14:20,347 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:14:20,917 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '106028#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:14:20,917 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:14:20,917 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:14:20,918 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 51 [2022-11-19 07:14:20,918 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340660681] [2022-11-19 07:14:20,918 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:14:20,919 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-19 07:14:20,919 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:14:20,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-19 07:14:20,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1228, Invalid=2432, Unknown=0, NotChecked=0, Total=3660 [2022-11-19 07:14:20,920 INFO L87 Difference]: Start difference. First operand 277 states and 279 transitions. Second operand has 52 states, 52 states have (on average 5.711538461538462) internal successors, (297), 51 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:14:22,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:14:22,137 INFO L93 Difference]: Finished difference Result 294 states and 297 transitions. [2022-11-19 07:14:22,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2022-11-19 07:14:22,137 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 5.711538461538462) internal successors, (297), 51 states have internal predecessors, (297), 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 276 [2022-11-19 07:14:22,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:14:22,139 INFO L225 Difference]: With dead ends: 294 [2022-11-19 07:14:22,139 INFO L226 Difference]: Without dead ends: 292 [2022-11-19 07:14:22,140 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 966 GetRequests, 771 SyntacticMatches, 88 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5456 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=3681, Invalid=8091, Unknown=0, NotChecked=0, Total=11772 [2022-11-19 07:14:22,140 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 526 mSDsluCounter, 287 mSDsCounter, 0 mSdLazyCounter, 420 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 526 SdHoareTripleChecker+Valid, 341 SdHoareTripleChecker+Invalid, 471 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 420 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:14:22,140 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [526 Valid, 341 Invalid, 471 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 420 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:14:22,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2022-11-19 07:14:22,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 285. [2022-11-19 07:14:22,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 285 states, 284 states have (on average 1.0105633802816902) internal successors, (287), 284 states have internal predecessors, (287), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:14:22,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 285 states to 285 states and 287 transitions. [2022-11-19 07:14:22,199 INFO L78 Accepts]: Start accepts. Automaton has 285 states and 287 transitions. Word has length 276 [2022-11-19 07:14:22,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:14:22,199 INFO L495 AbstractCegarLoop]: Abstraction has 285 states and 287 transitions. [2022-11-19 07:14:22,199 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 5.711538461538462) internal successors, (297), 51 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:14:22,199 INFO L276 IsEmpty]: Start isEmpty. Operand 285 states and 287 transitions. [2022-11-19 07:14:22,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2022-11-19 07:14:22,201 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:14:22,201 INFO L195 NwaCegarLoop]: trace histogram [47, 46, 46, 46, 46, 45, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:14:22,207 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Forceful destruction successful, exit code 0 [2022-11-19 07:14:22,401 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2022-11-19 07:14:22,401 INFO L420 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:14:22,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:14:22,402 INFO L85 PathProgramCache]: Analyzing trace with hash 1638834331, now seen corresponding path program 67 times [2022-11-19 07:14:22,402 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:14:22,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1806655792] [2022-11-19 07:14:22,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:14:22,402 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:14:22,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:14:26,780 INFO L134 CoverageAnalysis]: Checked inductivity of 6302 backedges. 4097 proven. 2205 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:14:26,780 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:14:26,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1806655792] [2022-11-19 07:14:26,781 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1806655792] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:14:26,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1062293404] [2022-11-19 07:14:26,781 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:14:26,781 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:14:26,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:14:26,782 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:14:26,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2022-11-19 07:14:26,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:14:26,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 1049 conjuncts, 94 conjunts are in the unsatisfiable core [2022-11-19 07:14:26,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:14:30,970 INFO L134 CoverageAnalysis]: Checked inductivity of 6302 backedges. 4230 proven. 2070 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:14:30,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:14:33,981 INFO L134 CoverageAnalysis]: Checked inductivity of 6302 backedges. 4230 proven. 2070 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:14:33,981 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1062293404] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:14:33,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [781753294] [2022-11-19 07:14:33,982 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:14:33,982 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:14:33,982 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:14:33,982 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:14:33,982 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:14:34,066 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:14:35,142 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '108836#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:14:35,142 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:14:35,142 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:14:35,143 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 94, 94] total 143 [2022-11-19 07:14:35,143 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104728388] [2022-11-19 07:14:35,143 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:14:35,143 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 143 states [2022-11-19 07:14:35,143 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:14:35,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2022-11-19 07:14:35,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4683, Invalid=18269, Unknown=0, NotChecked=0, Total=22952 [2022-11-19 07:14:35,146 INFO L87 Difference]: Start difference. First operand 285 states and 287 transitions. Second operand has 143 states, 143 states have (on average 3.3286713286713288) internal successors, (476), 143 states have internal predecessors, (476), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:14:38,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:14:38,287 INFO L93 Difference]: Finished difference Result 614 states and 663 transitions. [2022-11-19 07:14:38,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2022-11-19 07:14:38,287 INFO L78 Accepts]: Start accepts. Automaton has has 143 states, 143 states have (on average 3.3286713286713288) internal successors, (476), 143 states have internal predecessors, (476), 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 284 [2022-11-19 07:14:38,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:14:38,288 INFO L225 Difference]: With dead ends: 614 [2022-11-19 07:14:38,288 INFO L226 Difference]: Without dead ends: 425 [2022-11-19 07:14:38,290 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 991 GetRequests, 705 SyntacticMatches, 90 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14953 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=9009, Invalid=29997, Unknown=0, NotChecked=0, Total=39006 [2022-11-19 07:14:38,291 INFO L413 NwaCegarLoop]: 94 mSDtfsCounter, 471 mSDsluCounter, 953 mSDsCounter, 0 mSdLazyCounter, 1102 mSolverCounterSat, 496 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 471 SdHoareTripleChecker+Valid, 1047 SdHoareTripleChecker+Invalid, 1598 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 496 IncrementalHoareTripleChecker+Valid, 1102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 07:14:38,291 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [471 Valid, 1047 Invalid, 1598 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [496 Valid, 1102 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-19 07:14:38,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 425 states. [2022-11-19 07:14:38,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 425 to 287. [2022-11-19 07:14:38,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 287 states, 286 states have (on average 1.0104895104895104) internal successors, (289), 286 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:14:38,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 289 transitions. [2022-11-19 07:14:38,332 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 289 transitions. Word has length 284 [2022-11-19 07:14:38,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:14:38,332 INFO L495 AbstractCegarLoop]: Abstraction has 287 states and 289 transitions. [2022-11-19 07:14:38,333 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 143 states, 143 states have (on average 3.3286713286713288) internal successors, (476), 143 states have internal predecessors, (476), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:14:38,333 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 289 transitions. [2022-11-19 07:14:38,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2022-11-19 07:14:38,334 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:14:38,334 INFO L195 NwaCegarLoop]: trace histogram [47, 47, 46, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:14:38,343 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Forceful destruction successful, exit code 0 [2022-11-19 07:14:38,534 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2022-11-19 07:14:38,535 INFO L420 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:14:38,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:14:38,535 INFO L85 PathProgramCache]: Analyzing trace with hash -1952277376, now seen corresponding path program 68 times [2022-11-19 07:14:38,535 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:14:38,535 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1817900807] [2022-11-19 07:14:38,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:14:38,535 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:14:38,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:14:43,000 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 4097 proven. 2297 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:14:43,000 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:14:43,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1817900807] [2022-11-19 07:14:43,000 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1817900807] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:14:43,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1028275346] [2022-11-19 07:14:43,000 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:14:43,000 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:14:43,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:14:43,001 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:14:43,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2022-11-19 07:14:43,337 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2022-11-19 07:14:43,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:14:43,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 1059 conjuncts, 96 conjunts are in the unsatisfiable core [2022-11-19 07:14:43,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:14:47,521 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 4232 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:14:47,522 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:14:50,644 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 4232 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:14:50,645 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1028275346] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:14:50,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [294974690] [2022-11-19 07:14:50,646 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:14:50,646 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:14:50,646 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:14:50,646 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:14:50,646 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:14:50,753 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:14:51,840 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '112114#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:14:51,840 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:14:51,841 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:14:51,841 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96, 96] total 145 [2022-11-19 07:14:51,841 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863091506] [2022-11-19 07:14:51,841 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:14:51,842 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 145 states [2022-11-19 07:14:51,842 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:14:51,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 145 interpolants. [2022-11-19 07:14:51,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4829, Invalid=18733, Unknown=0, NotChecked=0, Total=23562 [2022-11-19 07:14:51,844 INFO L87 Difference]: Start difference. First operand 287 states and 289 transitions. Second operand has 145 states, 145 states have (on average 3.296551724137931) internal successors, (478), 145 states have internal predecessors, (478), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:14:55,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:14:55,064 INFO L93 Difference]: Finished difference Result 621 states and 671 transitions. [2022-11-19 07:14:55,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2022-11-19 07:14:55,065 INFO L78 Accepts]: Start accepts. Automaton has has 145 states, 145 states have (on average 3.296551724137931) internal successors, (478), 145 states have internal predecessors, (478), 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 286 [2022-11-19 07:14:55,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:14:55,065 INFO L225 Difference]: With dead ends: 621 [2022-11-19 07:14:55,066 INFO L226 Difference]: Without dead ends: 430 [2022-11-19 07:14:55,067 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 999 GetRequests, 708 SyntacticMatches, 92 SemanticMatches, 199 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15364 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=9343, Invalid=30857, Unknown=0, NotChecked=0, Total=40200 [2022-11-19 07:14:55,068 INFO L413 NwaCegarLoop]: 96 mSDtfsCounter, 407 mSDsluCounter, 1079 mSDsCounter, 0 mSdLazyCounter, 1218 mSolverCounterSat, 329 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 407 SdHoareTripleChecker+Valid, 1175 SdHoareTripleChecker+Invalid, 1547 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 329 IncrementalHoareTripleChecker+Valid, 1218 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 07:14:55,068 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [407 Valid, 1175 Invalid, 1547 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [329 Valid, 1218 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-19 07:14:55,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 430 states. [2022-11-19 07:14:55,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 430 to 289. [2022-11-19 07:14:55,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 288 states have (on average 1.0104166666666667) internal successors, (291), 288 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:14:55,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 291 transitions. [2022-11-19 07:14:55,120 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 291 transitions. Word has length 286 [2022-11-19 07:14:55,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:14:55,121 INFO L495 AbstractCegarLoop]: Abstraction has 289 states and 291 transitions. [2022-11-19 07:14:55,121 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 145 states, 145 states have (on average 3.296551724137931) internal successors, (478), 145 states have internal predecessors, (478), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:14:55,121 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 291 transitions. [2022-11-19 07:14:55,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 289 [2022-11-19 07:14:55,122 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:14:55,122 INFO L195 NwaCegarLoop]: trace histogram [48, 47, 47, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:14:55,127 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Forceful destruction successful, exit code 0 [2022-11-19 07:14:55,322 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:14:55,322 INFO L420 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:14:55,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:14:55,323 INFO L85 PathProgramCache]: Analyzing trace with hash 143078181, now seen corresponding path program 69 times [2022-11-19 07:14:55,323 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:14:55,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1037881034] [2022-11-19 07:14:55,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:14:55,323 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:14:55,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:14:58,052 INFO L134 CoverageAnalysis]: Checked inductivity of 6488 backedges. 2162 proven. 4326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:14:58,053 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:14:58,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1037881034] [2022-11-19 07:14:58,053 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1037881034] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:14:58,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1588713984] [2022-11-19 07:14:58,053 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:14:58,053 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:14:58,053 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:14:58,054 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:14:58,056 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2022-11-19 07:14:58,248 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:14:58,248 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:14:58,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 1069 conjuncts, 100 conjunts are in the unsatisfiable core [2022-11-19 07:14:58,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:14:58,635 INFO L134 CoverageAnalysis]: Checked inductivity of 6488 backedges. 2256 proven. 4232 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:14:58,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:15:00,723 INFO L134 CoverageAnalysis]: Checked inductivity of 6488 backedges. 2256 proven. 4232 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:15:00,723 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1588713984] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:15:00,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [360273437] [2022-11-19 07:15:00,724 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:15:00,724 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:15:00,724 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:15:00,724 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:15:00,725 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:15:00,807 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:15:01,386 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '115328#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:15:01,387 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:15:01,387 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:15:01,387 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 53 [2022-11-19 07:15:01,387 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1592644891] [2022-11-19 07:15:01,387 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:15:01,387 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-19 07:15:01,387 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:15:01,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-19 07:15:01,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1327, Invalid=2579, Unknown=0, NotChecked=0, Total=3906 [2022-11-19 07:15:01,389 INFO L87 Difference]: Start difference. First operand 289 states and 291 transitions. Second operand has 54 states, 54 states have (on average 5.722222222222222) internal successors, (309), 53 states have internal predecessors, (309), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:15:02,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:15:02,695 INFO L93 Difference]: Finished difference Result 306 states and 309 transitions. [2022-11-19 07:15:02,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2022-11-19 07:15:02,695 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 5.722222222222222) internal successors, (309), 53 states have internal predecessors, (309), 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 288 [2022-11-19 07:15:02,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:15:02,696 INFO L225 Difference]: With dead ends: 306 [2022-11-19 07:15:02,696 INFO L226 Difference]: Without dead ends: 304 [2022-11-19 07:15:02,697 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1008 GetRequests, 805 SyntacticMatches, 92 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5884 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3982, Invalid=8674, Unknown=0, NotChecked=0, Total=12656 [2022-11-19 07:15:02,698 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 445 mSDsluCounter, 375 mSDsCounter, 0 mSdLazyCounter, 500 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 445 SdHoareTripleChecker+Valid, 431 SdHoareTripleChecker+Invalid, 553 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 500 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:15:02,698 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [445 Valid, 431 Invalid, 553 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 500 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:15:02,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2022-11-19 07:15:02,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 297. [2022-11-19 07:15:02,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 297 states, 296 states have (on average 1.010135135135135) internal successors, (299), 296 states have internal predecessors, (299), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:15:02,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 299 transitions. [2022-11-19 07:15:02,775 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 299 transitions. Word has length 288 [2022-11-19 07:15:02,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:15:02,775 INFO L495 AbstractCegarLoop]: Abstraction has 297 states and 299 transitions. [2022-11-19 07:15:02,775 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 5.722222222222222) internal successors, (309), 53 states have internal predecessors, (309), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:15:02,775 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 299 transitions. [2022-11-19 07:15:02,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2022-11-19 07:15:02,776 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:15:02,776 INFO L195 NwaCegarLoop]: trace histogram [49, 48, 48, 48, 48, 47, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:15:02,783 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Forceful destruction successful, exit code 0 [2022-11-19 07:15:02,977 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:15:02,977 INFO L420 AbstractCegarLoop]: === Iteration 73 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:15:02,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:15:02,977 INFO L85 PathProgramCache]: Analyzing trace with hash 1263833099, now seen corresponding path program 70 times [2022-11-19 07:15:02,977 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:15:02,977 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1560096788] [2022-11-19 07:15:02,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:15:02,978 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:15:03,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:15:07,843 INFO L134 CoverageAnalysis]: Checked inductivity of 6864 backedges. 4467 proven. 2397 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:15:07,843 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:15:07,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1560096788] [2022-11-19 07:15:07,843 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1560096788] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:15:07,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [802997728] [2022-11-19 07:15:07,843 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:15:07,843 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:15:07,843 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:15:07,844 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:15:07,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2022-11-19 07:15:08,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:15:08,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 1093 conjuncts, 98 conjunts are in the unsatisfiable core [2022-11-19 07:15:08,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:15:12,397 INFO L134 CoverageAnalysis]: Checked inductivity of 6864 backedges. 4606 proven. 2256 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:15:12,398 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:15:15,638 INFO L134 CoverageAnalysis]: Checked inductivity of 6864 backedges. 4606 proven. 2256 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:15:15,638 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [802997728] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:15:15,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2118012849] [2022-11-19 07:15:15,639 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:15:15,639 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:15:15,639 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:15:15,639 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:15:15,639 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:15:15,730 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:15:16,852 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '118254#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:15:16,852 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:15:16,852 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:15:16,853 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 98, 98] total 149 [2022-11-19 07:15:16,853 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391658488] [2022-11-19 07:15:16,853 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:15:16,853 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 149 states [2022-11-19 07:15:16,853 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:15:16,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 149 interpolants. [2022-11-19 07:15:16,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5077, Invalid=19729, Unknown=0, NotChecked=0, Total=24806 [2022-11-19 07:15:16,855 INFO L87 Difference]: Start difference. First operand 297 states and 299 transitions. Second operand has 149 states, 149 states have (on average 3.3288590604026846) internal successors, (496), 149 states have internal predecessors, (496), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:15:20,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:15:20,305 INFO L93 Difference]: Finished difference Result 640 states and 691 transitions. [2022-11-19 07:15:20,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2022-11-19 07:15:20,306 INFO L78 Accepts]: Start accepts. Automaton has has 149 states, 149 states have (on average 3.3288590604026846) internal successors, (496), 149 states have internal predecessors, (496), 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 296 [2022-11-19 07:15:20,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:15:20,307 INFO L225 Difference]: With dead ends: 640 [2022-11-19 07:15:20,307 INFO L226 Difference]: Without dead ends: 443 [2022-11-19 07:15:20,308 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1033 GetRequests, 735 SyntacticMatches, 94 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16179 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=9783, Invalid=32447, Unknown=0, NotChecked=0, Total=42230 [2022-11-19 07:15:20,309 INFO L413 NwaCegarLoop]: 98 mSDtfsCounter, 432 mSDsluCounter, 1239 mSDsCounter, 0 mSdLazyCounter, 1381 mSolverCounterSat, 342 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 432 SdHoareTripleChecker+Valid, 1337 SdHoareTripleChecker+Invalid, 1723 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 342 IncrementalHoareTripleChecker+Valid, 1381 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-19 07:15:20,309 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [432 Valid, 1337 Invalid, 1723 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [342 Valid, 1381 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-19 07:15:20,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 443 states. [2022-11-19 07:15:20,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 443 to 299. [2022-11-19 07:15:20,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 299 states, 298 states have (on average 1.0100671140939597) internal successors, (301), 298 states have internal predecessors, (301), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:15:20,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 301 transitions. [2022-11-19 07:15:20,354 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 301 transitions. Word has length 296 [2022-11-19 07:15:20,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:15:20,355 INFO L495 AbstractCegarLoop]: Abstraction has 299 states and 301 transitions. [2022-11-19 07:15:20,355 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 149 states, 149 states have (on average 3.3288590604026846) internal successors, (496), 149 states have internal predecessors, (496), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:15:20,355 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 301 transitions. [2022-11-19 07:15:20,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2022-11-19 07:15:20,356 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:15:20,356 INFO L195 NwaCegarLoop]: trace histogram [49, 49, 48, 48, 48, 48, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:15:20,361 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Ended with exit code 0 [2022-11-19 07:15:20,556 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:15:20,557 INFO L420 AbstractCegarLoop]: === Iteration 74 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:15:20,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:15:20,557 INFO L85 PathProgramCache]: Analyzing trace with hash -212018064, now seen corresponding path program 71 times [2022-11-19 07:15:20,557 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:15:20,557 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [395370336] [2022-11-19 07:15:20,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:15:20,557 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:15:20,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:15:25,445 INFO L134 CoverageAnalysis]: Checked inductivity of 6960 backedges. 4467 proven. 2493 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:15:25,446 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:15:25,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [395370336] [2022-11-19 07:15:25,446 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [395370336] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:15:25,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1878625597] [2022-11-19 07:15:25,446 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:15:25,446 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:15:25,447 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:15:25,448 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:15:25,451 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Waiting until timeout for monitored process [2022-11-19 07:15:25,802 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 49 check-sat command(s) [2022-11-19 07:15:25,802 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:15:25,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 1103 conjuncts, 100 conjunts are in the unsatisfiable core [2022-11-19 07:15:25,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:15:30,328 INFO L134 CoverageAnalysis]: Checked inductivity of 6960 backedges. 4608 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:15:30,329 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:15:33,750 INFO L134 CoverageAnalysis]: Checked inductivity of 6960 backedges. 4608 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:15:33,750 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1878625597] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:15:33,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [216915815] [2022-11-19 07:15:33,751 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:15:33,751 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:15:33,752 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:15:33,752 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:15:33,752 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:15:33,845 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:15:34,979 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '121670#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:15:34,979 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:15:34,979 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:15:34,980 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 100, 100] total 151 [2022-11-19 07:15:34,980 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401820536] [2022-11-19 07:15:34,980 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:15:34,980 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 151 states [2022-11-19 07:15:34,980 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:15:34,982 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 151 interpolants. [2022-11-19 07:15:34,983 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5229, Invalid=20211, Unknown=0, NotChecked=0, Total=25440 [2022-11-19 07:15:34,983 INFO L87 Difference]: Start difference. First operand 299 states and 301 transitions. Second operand has 151 states, 151 states have (on average 3.2980132450331126) internal successors, (498), 151 states have internal predecessors, (498), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:15:38,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:15:38,510 INFO L93 Difference]: Finished difference Result 647 states and 699 transitions. [2022-11-19 07:15:38,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2022-11-19 07:15:38,510 INFO L78 Accepts]: Start accepts. Automaton has has 151 states, 151 states have (on average 3.2980132450331126) internal successors, (498), 151 states have internal predecessors, (498), 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 298 [2022-11-19 07:15:38,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:15:38,511 INFO L225 Difference]: With dead ends: 647 [2022-11-19 07:15:38,512 INFO L226 Difference]: Without dead ends: 448 [2022-11-19 07:15:38,514 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1041 GetRequests, 738 SyntacticMatches, 96 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16606 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=10131, Invalid=33341, Unknown=0, NotChecked=0, Total=43472 [2022-11-19 07:15:38,514 INFO L413 NwaCegarLoop]: 100 mSDtfsCounter, 481 mSDsluCounter, 1091 mSDsCounter, 0 mSdLazyCounter, 1244 mSolverCounterSat, 369 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 481 SdHoareTripleChecker+Valid, 1191 SdHoareTripleChecker+Invalid, 1613 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 369 IncrementalHoareTripleChecker+Valid, 1244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-19 07:15:38,514 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [481 Valid, 1191 Invalid, 1613 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [369 Valid, 1244 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-19 07:15:38,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 448 states. [2022-11-19 07:15:38,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 448 to 301. [2022-11-19 07:15:38,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 301 states, 300 states have (on average 1.01) internal successors, (303), 300 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:15:38,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 303 transitions. [2022-11-19 07:15:38,561 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 303 transitions. Word has length 298 [2022-11-19 07:15:38,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:15:38,561 INFO L495 AbstractCegarLoop]: Abstraction has 301 states and 303 transitions. [2022-11-19 07:15:38,561 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 151 states, 151 states have (on average 3.2980132450331126) internal successors, (498), 151 states have internal predecessors, (498), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:15:38,562 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 303 transitions. [2022-11-19 07:15:38,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2022-11-19 07:15:38,563 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:15:38,563 INFO L195 NwaCegarLoop]: trace histogram [50, 49, 49, 48, 48, 48, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:15:38,569 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Forceful destruction successful, exit code 0 [2022-11-19 07:15:38,763 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:15:38,764 INFO L420 AbstractCegarLoop]: === Iteration 75 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:15:38,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:15:38,764 INFO L85 PathProgramCache]: Analyzing trace with hash -1165778027, now seen corresponding path program 72 times [2022-11-19 07:15:38,764 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:15:38,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [952211638] [2022-11-19 07:15:38,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:15:38,764 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:15:38,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:15:42,146 INFO L134 CoverageAnalysis]: Checked inductivity of 7058 backedges. 2352 proven. 4706 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:15:42,146 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:15:42,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [952211638] [2022-11-19 07:15:42,146 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [952211638] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:15:42,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [36830380] [2022-11-19 07:15:42,147 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:15:42,147 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:15:42,147 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:15:42,148 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:15:42,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2022-11-19 07:15:42,351 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:15:42,351 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:15:42,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 1113 conjuncts, 104 conjunts are in the unsatisfiable core [2022-11-19 07:15:42,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:15:42,772 INFO L134 CoverageAnalysis]: Checked inductivity of 7058 backedges. 2450 proven. 4608 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:15:42,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:15:45,052 INFO L134 CoverageAnalysis]: Checked inductivity of 7058 backedges. 2450 proven. 4608 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:15:45,052 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [36830380] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:15:45,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [878146415] [2022-11-19 07:15:45,053 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:15:45,054 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:15:45,054 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:15:45,054 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:15:45,054 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:15:45,159 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:15:45,796 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '125018#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:15:45,796 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:15:45,796 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:15:45,796 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 55 [2022-11-19 07:15:45,796 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034469491] [2022-11-19 07:15:45,796 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:15:45,797 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-11-19 07:15:45,797 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:15:45,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-11-19 07:15:45,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1430, Invalid=2730, Unknown=0, NotChecked=0, Total=4160 [2022-11-19 07:15:45,798 INFO L87 Difference]: Start difference. First operand 301 states and 303 transitions. Second operand has 56 states, 56 states have (on average 5.732142857142857) internal successors, (321), 55 states have internal predecessors, (321), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:15:47,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:15:47,171 INFO L93 Difference]: Finished difference Result 318 states and 321 transitions. [2022-11-19 07:15:47,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2022-11-19 07:15:47,172 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 5.732142857142857) internal successors, (321), 55 states have internal predecessors, (321), 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 300 [2022-11-19 07:15:47,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:15:47,174 INFO L225 Difference]: With dead ends: 318 [2022-11-19 07:15:47,174 INFO L226 Difference]: Without dead ends: 316 [2022-11-19 07:15:47,175 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1050 GetRequests, 839 SyntacticMatches, 96 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6328 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=4295, Invalid=9277, Unknown=0, NotChecked=0, Total=13572 [2022-11-19 07:15:47,175 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 318 mSDsluCounter, 387 mSDsCounter, 0 mSdLazyCounter, 518 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 318 SdHoareTripleChecker+Valid, 445 SdHoareTripleChecker+Invalid, 573 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 518 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:15:47,175 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [318 Valid, 445 Invalid, 573 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 518 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:15:47,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 316 states. [2022-11-19 07:15:47,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 316 to 309. [2022-11-19 07:15:47,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 308 states have (on average 1.0097402597402598) internal successors, (311), 308 states have internal predecessors, (311), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:15:47,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 311 transitions. [2022-11-19 07:15:47,221 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 311 transitions. Word has length 300 [2022-11-19 07:15:47,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:15:47,221 INFO L495 AbstractCegarLoop]: Abstraction has 309 states and 311 transitions. [2022-11-19 07:15:47,221 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 5.732142857142857) internal successors, (321), 55 states have internal predecessors, (321), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:15:47,222 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 311 transitions. [2022-11-19 07:15:47,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 309 [2022-11-19 07:15:47,222 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:15:47,223 INFO L195 NwaCegarLoop]: trace histogram [51, 50, 50, 50, 50, 49, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:15:47,228 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Forceful destruction successful, exit code 0 [2022-11-19 07:15:47,427 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable74 [2022-11-19 07:15:47,427 INFO L420 AbstractCegarLoop]: === Iteration 76 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:15:47,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:15:47,427 INFO L85 PathProgramCache]: Analyzing trace with hash 265392251, now seen corresponding path program 73 times [2022-11-19 07:15:47,427 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:15:47,427 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1970228997] [2022-11-19 07:15:47,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:15:47,428 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:15:47,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:15:52,724 INFO L134 CoverageAnalysis]: Checked inductivity of 7450 backedges. 4853 proven. 2597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:15:52,724 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:15:52,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1970228997] [2022-11-19 07:15:52,725 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1970228997] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:15:52,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [309110022] [2022-11-19 07:15:52,725 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:15:52,725 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:15:52,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:15:52,726 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:15:52,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2022-11-19 07:15:52,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:15:52,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 1137 conjuncts, 102 conjunts are in the unsatisfiable core [2022-11-19 07:15:52,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:15:57,635 INFO L134 CoverageAnalysis]: Checked inductivity of 7450 backedges. 4998 proven. 2450 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:15:57,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:16:01,188 INFO L134 CoverageAnalysis]: Checked inductivity of 7450 backedges. 4998 proven. 2450 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:16:01,188 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [309110022] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:16:01,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2053212069] [2022-11-19 07:16:01,189 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:16:01,189 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:16:01,189 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:16:01,190 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:16:01,190 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:16:01,283 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:16:02,433 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '128062#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:16:02,433 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:16:02,434 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:16:02,434 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [103, 102, 102] total 155 [2022-11-19 07:16:02,434 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470518668] [2022-11-19 07:16:02,434 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:16:02,434 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 155 states [2022-11-19 07:16:02,435 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:16:02,435 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2022-11-19 07:16:02,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5487, Invalid=21245, Unknown=0, NotChecked=0, Total=26732 [2022-11-19 07:16:02,437 INFO L87 Difference]: Start difference. First operand 309 states and 311 transitions. Second operand has 155 states, 155 states have (on average 3.329032258064516) internal successors, (516), 155 states have internal predecessors, (516), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:16:06,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:16:06,134 INFO L93 Difference]: Finished difference Result 666 states and 719 transitions. [2022-11-19 07:16:06,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2022-11-19 07:16:06,134 INFO L78 Accepts]: Start accepts. Automaton has has 155 states, 155 states have (on average 3.329032258064516) internal successors, (516), 155 states have internal predecessors, (516), 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 308 [2022-11-19 07:16:06,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:16:06,135 INFO L225 Difference]: With dead ends: 666 [2022-11-19 07:16:06,135 INFO L226 Difference]: Without dead ends: 461 [2022-11-19 07:16:06,138 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1075 GetRequests, 765 SyntacticMatches, 98 SemanticMatches, 212 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17453 ImplicationChecksByTransitivity, 13.0s TimeCoverageRelationStatistics Valid=10589, Invalid=34993, Unknown=0, NotChecked=0, Total=45582 [2022-11-19 07:16:06,138 INFO L413 NwaCegarLoop]: 102 mSDtfsCounter, 441 mSDsluCounter, 1195 mSDsCounter, 0 mSdLazyCounter, 1353 mSolverCounterSat, 402 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 441 SdHoareTripleChecker+Valid, 1297 SdHoareTripleChecker+Invalid, 1755 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 402 IncrementalHoareTripleChecker+Valid, 1353 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-19 07:16:06,138 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [441 Valid, 1297 Invalid, 1755 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [402 Valid, 1353 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-19 07:16:06,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 461 states. [2022-11-19 07:16:06,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 461 to 311. [2022-11-19 07:16:06,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 311 states, 310 states have (on average 1.0096774193548388) internal successors, (313), 310 states have internal predecessors, (313), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:16:06,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 311 states to 311 states and 313 transitions. [2022-11-19 07:16:06,188 INFO L78 Accepts]: Start accepts. Automaton has 311 states and 313 transitions. Word has length 308 [2022-11-19 07:16:06,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:16:06,188 INFO L495 AbstractCegarLoop]: Abstraction has 311 states and 313 transitions. [2022-11-19 07:16:06,188 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 155 states, 155 states have (on average 3.329032258064516) internal successors, (516), 155 states have internal predecessors, (516), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:16:06,188 INFO L276 IsEmpty]: Start isEmpty. Operand 311 states and 313 transitions. [2022-11-19 07:16:06,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 311 [2022-11-19 07:16:06,189 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:16:06,189 INFO L195 NwaCegarLoop]: trace histogram [51, 51, 50, 50, 50, 50, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:16:06,195 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Forceful destruction successful, exit code 0 [2022-11-19 07:16:06,390 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:16:06,390 INFO L420 AbstractCegarLoop]: === Iteration 77 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:16:06,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:16:06,390 INFO L85 PathProgramCache]: Analyzing trace with hash -344363680, now seen corresponding path program 74 times [2022-11-19 07:16:06,391 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:16:06,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [947502749] [2022-11-19 07:16:06,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:16:06,391 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:16:06,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:16:11,865 INFO L134 CoverageAnalysis]: Checked inductivity of 7550 backedges. 4853 proven. 2697 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:16:11,865 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:16:11,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [947502749] [2022-11-19 07:16:11,865 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [947502749] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:16:11,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [378648527] [2022-11-19 07:16:11,865 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:16:11,865 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:16:11,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:16:11,866 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:16:11,868 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Waiting until timeout for monitored process [2022-11-19 07:16:12,235 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 51 check-sat command(s) [2022-11-19 07:16:12,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:16:12,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 1147 conjuncts, 104 conjunts are in the unsatisfiable core [2022-11-19 07:16:12,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:16:17,076 INFO L134 CoverageAnalysis]: Checked inductivity of 7550 backedges. 5000 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:16:17,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:16:20,724 INFO L134 CoverageAnalysis]: Checked inductivity of 7550 backedges. 5000 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:16:20,724 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [378648527] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:16:20,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [634991007] [2022-11-19 07:16:20,725 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:16:20,725 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:16:20,726 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:16:20,726 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:16:20,726 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:16:20,856 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:16:22,057 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '131616#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:16:22,057 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:16:22,057 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:16:22,057 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [104, 104, 104] total 157 [2022-11-19 07:16:22,058 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1270661619] [2022-11-19 07:16:22,058 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:16:22,058 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 157 states [2022-11-19 07:16:22,058 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:16:22,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 157 interpolants. [2022-11-19 07:16:22,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5645, Invalid=21745, Unknown=0, NotChecked=0, Total=27390 [2022-11-19 07:16:22,060 INFO L87 Difference]: Start difference. First operand 311 states and 313 transitions. Second operand has 157 states, 157 states have (on average 3.299363057324841) internal successors, (518), 157 states have internal predecessors, (518), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:16:26,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:16:26,008 INFO L93 Difference]: Finished difference Result 673 states and 727 transitions. [2022-11-19 07:16:26,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2022-11-19 07:16:26,008 INFO L78 Accepts]: Start accepts. Automaton has has 157 states, 157 states have (on average 3.299363057324841) internal successors, (518), 157 states have internal predecessors, (518), 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 310 [2022-11-19 07:16:26,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:16:26,009 INFO L225 Difference]: With dead ends: 673 [2022-11-19 07:16:26,009 INFO L226 Difference]: Without dead ends: 466 [2022-11-19 07:16:26,013 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1083 GetRequests, 768 SyntacticMatches, 100 SemanticMatches, 215 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17896 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=10951, Invalid=35921, Unknown=0, NotChecked=0, Total=46872 [2022-11-19 07:16:26,013 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 564 mSDsluCounter, 1160 mSDsCounter, 0 mSdLazyCounter, 1329 mSolverCounterSat, 677 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 564 SdHoareTripleChecker+Valid, 1264 SdHoareTripleChecker+Invalid, 2006 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 677 IncrementalHoareTripleChecker+Valid, 1329 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-19 07:16:26,013 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [564 Valid, 1264 Invalid, 2006 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [677 Valid, 1329 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-19 07:16:26,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2022-11-19 07:16:26,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 313. [2022-11-19 07:16:26,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 313 states, 312 states have (on average 1.0096153846153846) internal successors, (315), 312 states have internal predecessors, (315), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:16:26,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 315 transitions. [2022-11-19 07:16:26,074 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 315 transitions. Word has length 310 [2022-11-19 07:16:26,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:16:26,075 INFO L495 AbstractCegarLoop]: Abstraction has 313 states and 315 transitions. [2022-11-19 07:16:26,075 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 157 states, 157 states have (on average 3.299363057324841) internal successors, (518), 157 states have internal predecessors, (518), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:16:26,075 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 315 transitions. [2022-11-19 07:16:26,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 313 [2022-11-19 07:16:26,076 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:16:26,076 INFO L195 NwaCegarLoop]: trace histogram [52, 51, 51, 50, 50, 50, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:16:26,083 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Forceful destruction successful, exit code 0 [2022-11-19 07:16:26,276 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:16:26,276 INFO L420 AbstractCegarLoop]: === Iteration 78 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:16:26,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:16:26,277 INFO L85 PathProgramCache]: Analyzing trace with hash 2090706181, now seen corresponding path program 75 times [2022-11-19 07:16:26,277 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:16:26,277 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [185323345] [2022-11-19 07:16:26,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:16:26,277 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:16:26,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:16:29,591 INFO L134 CoverageAnalysis]: Checked inductivity of 7652 backedges. 2550 proven. 5102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:16:29,591 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:16:29,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [185323345] [2022-11-19 07:16:29,591 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [185323345] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:16:29,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1488578853] [2022-11-19 07:16:29,591 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:16:29,592 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:16:29,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:16:29,592 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:16:29,595 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2022-11-19 07:16:29,800 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:16:29,800 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:16:29,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 1157 conjuncts, 108 conjunts are in the unsatisfiable core [2022-11-19 07:16:29,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:16:30,213 INFO L134 CoverageAnalysis]: Checked inductivity of 7652 backedges. 2652 proven. 5000 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:16:30,213 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:16:32,614 INFO L134 CoverageAnalysis]: Checked inductivity of 7652 backedges. 2652 proven. 5000 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:16:32,614 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1488578853] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:16:32,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [881463205] [2022-11-19 07:16:32,615 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:16:32,615 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:16:32,615 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:16:32,615 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:16:32,615 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:16:32,704 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:16:33,308 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '135098#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:16:33,308 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:16:33,308 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:16:33,309 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 57 [2022-11-19 07:16:33,309 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313459595] [2022-11-19 07:16:33,309 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:16:33,310 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-11-19 07:16:33,310 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:16:33,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-11-19 07:16:33,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1537, Invalid=2885, Unknown=0, NotChecked=0, Total=4422 [2022-11-19 07:16:33,311 INFO L87 Difference]: Start difference. First operand 313 states and 315 transitions. Second operand has 58 states, 58 states have (on average 5.741379310344827) internal successors, (333), 57 states have internal predecessors, (333), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:16:34,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:16:34,796 INFO L93 Difference]: Finished difference Result 330 states and 333 transitions. [2022-11-19 07:16:34,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2022-11-19 07:16:34,797 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 5.741379310344827) internal successors, (333), 57 states have internal predecessors, (333), 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 312 [2022-11-19 07:16:34,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:16:34,798 INFO L225 Difference]: With dead ends: 330 [2022-11-19 07:16:34,799 INFO L226 Difference]: Without dead ends: 328 [2022-11-19 07:16:34,800 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1092 GetRequests, 873 SyntacticMatches, 100 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6788 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=4620, Invalid=9900, Unknown=0, NotChecked=0, Total=14520 [2022-11-19 07:16:34,800 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 430 mSDsluCounter, 457 mSDsCounter, 0 mSdLazyCounter, 598 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 430 SdHoareTripleChecker+Valid, 517 SdHoareTripleChecker+Invalid, 655 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 598 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:16:34,800 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [430 Valid, 517 Invalid, 655 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 598 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:16:34,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2022-11-19 07:16:34,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 321. [2022-11-19 07:16:34,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 321 states, 320 states have (on average 1.009375) internal successors, (323), 320 states have internal predecessors, (323), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:16:34,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 321 states to 321 states and 323 transitions. [2022-11-19 07:16:34,861 INFO L78 Accepts]: Start accepts. Automaton has 321 states and 323 transitions. Word has length 312 [2022-11-19 07:16:34,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:16:34,862 INFO L495 AbstractCegarLoop]: Abstraction has 321 states and 323 transitions. [2022-11-19 07:16:34,862 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 5.741379310344827) internal successors, (333), 57 states have internal predecessors, (333), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:16:34,862 INFO L276 IsEmpty]: Start isEmpty. Operand 321 states and 323 transitions. [2022-11-19 07:16:34,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 321 [2022-11-19 07:16:34,863 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:16:34,863 INFO L195 NwaCegarLoop]: trace histogram [53, 52, 52, 52, 52, 51, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:16:34,868 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Forceful destruction successful, exit code 0 [2022-11-19 07:16:35,063 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:16:35,064 INFO L420 AbstractCegarLoop]: === Iteration 79 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:16:35,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:16:35,064 INFO L85 PathProgramCache]: Analyzing trace with hash 978002411, now seen corresponding path program 76 times [2022-11-19 07:16:35,064 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:16:35,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2113787491] [2022-11-19 07:16:35,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:16:35,064 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:16:35,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:16:40,844 INFO L134 CoverageAnalysis]: Checked inductivity of 8060 backedges. 5255 proven. 2805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:16:40,844 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:16:40,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2113787491] [2022-11-19 07:16:40,844 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2113787491] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:16:40,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [466756253] [2022-11-19 07:16:40,845 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:16:40,845 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:16:40,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:16:40,846 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:16:40,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Waiting until timeout for monitored process [2022-11-19 07:16:41,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:16:41,051 INFO L263 TraceCheckSpWp]: Trace formula consists of 1181 conjuncts, 106 conjunts are in the unsatisfiable core [2022-11-19 07:16:41,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:16:46,065 INFO L134 CoverageAnalysis]: Checked inductivity of 8060 backedges. 5406 proven. 2652 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:16:46,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:16:49,814 INFO L134 CoverageAnalysis]: Checked inductivity of 8060 backedges. 5406 proven. 2652 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:16:49,815 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [466756253] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:16:49,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1967523] [2022-11-19 07:16:49,816 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:16:49,816 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:16:49,816 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:16:49,816 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:16:49,816 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:16:49,902 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:16:51,076 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '138260#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:16:51,077 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:16:51,077 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:16:51,077 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [107, 106, 106] total 161 [2022-11-19 07:16:51,077 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [279446652] [2022-11-19 07:16:51,077 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:16:51,077 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 161 states [2022-11-19 07:16:51,078 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:16:51,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 161 interpolants. [2022-11-19 07:16:51,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5913, Invalid=22817, Unknown=0, NotChecked=0, Total=28730 [2022-11-19 07:16:51,080 INFO L87 Difference]: Start difference. First operand 321 states and 323 transitions. Second operand has 161 states, 161 states have (on average 3.329192546583851) internal successors, (536), 161 states have internal predecessors, (536), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:16:55,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:16:55,057 INFO L93 Difference]: Finished difference Result 692 states and 747 transitions. [2022-11-19 07:16:55,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2022-11-19 07:16:55,058 INFO L78 Accepts]: Start accepts. Automaton has has 161 states, 161 states have (on average 3.329192546583851) internal successors, (536), 161 states have internal predecessors, (536), 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 320 [2022-11-19 07:16:55,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:16:55,059 INFO L225 Difference]: With dead ends: 692 [2022-11-19 07:16:55,059 INFO L226 Difference]: Without dead ends: 479 [2022-11-19 07:16:55,061 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1117 GetRequests, 795 SyntacticMatches, 102 SemanticMatches, 220 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18775 ImplicationChecksByTransitivity, 13.9s TimeCoverageRelationStatistics Valid=11427, Invalid=37635, Unknown=0, NotChecked=0, Total=49062 [2022-11-19 07:16:55,061 INFO L413 NwaCegarLoop]: 106 mSDtfsCounter, 543 mSDsluCounter, 1038 mSDsCounter, 0 mSdLazyCounter, 1207 mSolverCounterSat, 515 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 543 SdHoareTripleChecker+Valid, 1144 SdHoareTripleChecker+Invalid, 1722 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 515 IncrementalHoareTripleChecker+Valid, 1207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-19 07:16:55,061 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [543 Valid, 1144 Invalid, 1722 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [515 Valid, 1207 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-19 07:16:55,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 479 states. [2022-11-19 07:16:55,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 479 to 323. [2022-11-19 07:16:55,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 323 states, 322 states have (on average 1.0093167701863355) internal successors, (325), 322 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:16:55,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 325 transitions. [2022-11-19 07:16:55,116 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 325 transitions. Word has length 320 [2022-11-19 07:16:55,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:16:55,116 INFO L495 AbstractCegarLoop]: Abstraction has 323 states and 325 transitions. [2022-11-19 07:16:55,116 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 161 states, 161 states have (on average 3.329192546583851) internal successors, (536), 161 states have internal predecessors, (536), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:16:55,116 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 325 transitions. [2022-11-19 07:16:55,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2022-11-19 07:16:55,117 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:16:55,118 INFO L195 NwaCegarLoop]: trace histogram [53, 53, 52, 52, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:16:55,127 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Forceful destruction successful, exit code 0 [2022-11-19 07:16:55,318 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:16:55,318 INFO L420 AbstractCegarLoop]: === Iteration 80 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:16:55,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:16:55,319 INFO L85 PathProgramCache]: Analyzing trace with hash -935473328, now seen corresponding path program 77 times [2022-11-19 07:16:55,319 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:16:55,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1616684910] [2022-11-19 07:16:55,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:16:55,319 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:16:55,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:17:01,177 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 5255 proven. 2909 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:17:01,177 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:17:01,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1616684910] [2022-11-19 07:17:01,177 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1616684910] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:17:01,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1294274925] [2022-11-19 07:17:01,177 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:17:01,177 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:17:01,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:17:01,178 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:17:01,180 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Waiting until timeout for monitored process [2022-11-19 07:17:01,587 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 53 check-sat command(s) [2022-11-19 07:17:01,587 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:17:01,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 1191 conjuncts, 108 conjunts are in the unsatisfiable core [2022-11-19 07:17:01,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:17:06,841 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 5408 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:17:06,841 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:17:10,769 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 5408 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:17:10,769 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1294274925] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:17:10,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1501212985] [2022-11-19 07:17:10,770 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:17:10,770 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:17:10,770 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:17:10,770 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:17:10,770 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:17:10,866 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:17:12,093 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '141952#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:17:12,093 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:17:12,094 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:17:12,094 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [108, 108, 108] total 163 [2022-11-19 07:17:12,094 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923662223] [2022-11-19 07:17:12,094 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:17:12,094 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 163 states [2022-11-19 07:17:12,094 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:17:12,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 163 interpolants. [2022-11-19 07:17:12,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6077, Invalid=23335, Unknown=0, NotChecked=0, Total=29412 [2022-11-19 07:17:12,097 INFO L87 Difference]: Start difference. First operand 323 states and 325 transitions. Second operand has 163 states, 163 states have (on average 3.3006134969325154) internal successors, (538), 163 states have internal predecessors, (538), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:17:16,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:17:16,348 INFO L93 Difference]: Finished difference Result 699 states and 755 transitions. [2022-11-19 07:17:16,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2022-11-19 07:17:16,348 INFO L78 Accepts]: Start accepts. Automaton has has 163 states, 163 states have (on average 3.3006134969325154) internal successors, (538), 163 states have internal predecessors, (538), 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 322 [2022-11-19 07:17:16,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:17:16,349 INFO L225 Difference]: With dead ends: 699 [2022-11-19 07:17:16,349 INFO L226 Difference]: Without dead ends: 484 [2022-11-19 07:17:16,353 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1125 GetRequests, 798 SyntacticMatches, 104 SemanticMatches, 223 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19234 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=11803, Invalid=38597, Unknown=0, NotChecked=0, Total=50400 [2022-11-19 07:17:16,354 INFO L413 NwaCegarLoop]: 108 mSDtfsCounter, 593 mSDsluCounter, 1113 mSDsCounter, 0 mSdLazyCounter, 1284 mSolverCounterSat, 545 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 593 SdHoareTripleChecker+Valid, 1221 SdHoareTripleChecker+Invalid, 1829 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 545 IncrementalHoareTripleChecker+Valid, 1284 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-19 07:17:16,354 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [593 Valid, 1221 Invalid, 1829 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [545 Valid, 1284 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-19 07:17:16,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 484 states. [2022-11-19 07:17:16,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 484 to 325. [2022-11-19 07:17:16,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 325 states, 324 states have (on average 1.0092592592592593) internal successors, (327), 324 states have internal predecessors, (327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:17:16,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 325 states to 325 states and 327 transitions. [2022-11-19 07:17:16,412 INFO L78 Accepts]: Start accepts. Automaton has 325 states and 327 transitions. Word has length 322 [2022-11-19 07:17:16,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:17:16,413 INFO L495 AbstractCegarLoop]: Abstraction has 325 states and 327 transitions. [2022-11-19 07:17:16,413 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 163 states, 163 states have (on average 3.3006134969325154) internal successors, (538), 163 states have internal predecessors, (538), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:17:16,413 INFO L276 IsEmpty]: Start isEmpty. Operand 325 states and 327 transitions. [2022-11-19 07:17:16,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2022-11-19 07:17:16,414 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:17:16,414 INFO L195 NwaCegarLoop]: trace histogram [54, 53, 53, 52, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:17:16,421 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Forceful destruction successful, exit code 0 [2022-11-19 07:17:16,615 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable79 [2022-11-19 07:17:16,615 INFO L420 AbstractCegarLoop]: === Iteration 81 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:17:16,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:17:16,615 INFO L85 PathProgramCache]: Analyzing trace with hash -1539655819, now seen corresponding path program 78 times [2022-11-19 07:17:16,615 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:17:16,615 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1299526639] [2022-11-19 07:17:16,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:17:16,616 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:17:16,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:17:20,480 INFO L134 CoverageAnalysis]: Checked inductivity of 8270 backedges. 2756 proven. 5514 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:17:20,480 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:17:20,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1299526639] [2022-11-19 07:17:20,481 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1299526639] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:17:20,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1410325540] [2022-11-19 07:17:20,481 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:17:20,481 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:17:20,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:17:20,482 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:17:20,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Waiting until timeout for monitored process [2022-11-19 07:17:20,697 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:17:20,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:17:20,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 1201 conjuncts, 112 conjunts are in the unsatisfiable core [2022-11-19 07:17:20,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:17:21,122 INFO L134 CoverageAnalysis]: Checked inductivity of 8270 backedges. 2862 proven. 5408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:17:21,122 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:17:23,752 INFO L134 CoverageAnalysis]: Checked inductivity of 8270 backedges. 2862 proven. 5408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:17:23,753 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1410325540] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:17:23,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [936382847] [2022-11-19 07:17:23,754 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:17:23,754 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:17:23,754 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:17:23,755 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:17:23,755 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:17:23,846 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:17:24,467 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '145568#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:17:24,468 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:17:24,468 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:17:24,468 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 59 [2022-11-19 07:17:24,468 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865214642] [2022-11-19 07:17:24,468 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:17:24,469 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-11-19 07:17:24,469 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:17:24,470 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-11-19 07:17:24,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1648, Invalid=3044, Unknown=0, NotChecked=0, Total=4692 [2022-11-19 07:17:24,471 INFO L87 Difference]: Start difference. First operand 325 states and 327 transitions. Second operand has 60 states, 60 states have (on average 5.75) internal successors, (345), 59 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:17:26,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:17:26,091 INFO L93 Difference]: Finished difference Result 342 states and 345 transitions. [2022-11-19 07:17:26,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2022-11-19 07:17:26,091 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 5.75) internal successors, (345), 59 states have internal predecessors, (345), 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 324 [2022-11-19 07:17:26,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:17:26,093 INFO L225 Difference]: With dead ends: 342 [2022-11-19 07:17:26,093 INFO L226 Difference]: Without dead ends: 340 [2022-11-19 07:17:26,094 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1134 GetRequests, 907 SyntacticMatches, 104 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7264 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=4957, Invalid=10543, Unknown=0, NotChecked=0, Total=15500 [2022-11-19 07:17:26,095 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 347 mSDsluCounter, 466 mSDsCounter, 0 mSdLazyCounter, 609 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 347 SdHoareTripleChecker+Valid, 528 SdHoareTripleChecker+Invalid, 668 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 609 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:17:26,095 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [347 Valid, 528 Invalid, 668 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 609 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:17:26,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2022-11-19 07:17:26,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 333. [2022-11-19 07:17:26,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 333 states, 332 states have (on average 1.0090361445783131) internal successors, (335), 332 states have internal predecessors, (335), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:17:26,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 335 transitions. [2022-11-19 07:17:26,148 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 335 transitions. Word has length 324 [2022-11-19 07:17:26,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:17:26,149 INFO L495 AbstractCegarLoop]: Abstraction has 333 states and 335 transitions. [2022-11-19 07:17:26,149 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 5.75) internal successors, (345), 59 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:17:26,149 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 335 transitions. [2022-11-19 07:17:26,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2022-11-19 07:17:26,150 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:17:26,150 INFO L195 NwaCegarLoop]: trace histogram [55, 54, 54, 54, 54, 53, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:17:26,160 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Forceful destruction successful, exit code 0 [2022-11-19 07:17:26,350 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:17:26,351 INFO L420 AbstractCegarLoop]: === Iteration 82 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:17:26,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:17:26,351 INFO L85 PathProgramCache]: Analyzing trace with hash 581354587, now seen corresponding path program 79 times [2022-11-19 07:17:26,351 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:17:26,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1797035450] [2022-11-19 07:17:26,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:17:26,351 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:17:26,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:17:32,481 INFO L134 CoverageAnalysis]: Checked inductivity of 8694 backedges. 5673 proven. 3021 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:17:32,481 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:17:32,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1797035450] [2022-11-19 07:17:32,482 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1797035450] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:17:32,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [995467577] [2022-11-19 07:17:32,482 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:17:32,482 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:17:32,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:17:32,483 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:17:32,485 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Waiting until timeout for monitored process [2022-11-19 07:17:32,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:17:32,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 1225 conjuncts, 110 conjunts are in the unsatisfiable core [2022-11-19 07:17:32,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:17:38,085 INFO L134 CoverageAnalysis]: Checked inductivity of 8694 backedges. 5830 proven. 2862 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:17:38,085 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:17:42,165 INFO L134 CoverageAnalysis]: Checked inductivity of 8694 backedges. 5830 proven. 2862 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:17:42,165 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [995467577] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:17:42,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [169250542] [2022-11-19 07:17:42,166 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:17:42,166 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:17:42,166 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:17:42,166 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:17:42,167 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:17:42,260 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:17:43,480 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '148848#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:17:43,480 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:17:43,480 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:17:43,481 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [111, 110, 110] total 167 [2022-11-19 07:17:43,481 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1661032532] [2022-11-19 07:17:43,481 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:17:43,481 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 167 states [2022-11-19 07:17:43,481 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:17:43,482 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 167 interpolants. [2022-11-19 07:17:43,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6355, Invalid=24445, Unknown=0, NotChecked=0, Total=30800 [2022-11-19 07:17:43,484 INFO L87 Difference]: Start difference. First operand 333 states and 335 transitions. Second operand has 167 states, 167 states have (on average 3.3293413173652695) internal successors, (556), 167 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:17:47,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:17:47,774 INFO L93 Difference]: Finished difference Result 718 states and 775 transitions. [2022-11-19 07:17:47,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2022-11-19 07:17:47,775 INFO L78 Accepts]: Start accepts. Automaton has has 167 states, 167 states have (on average 3.3293413173652695) internal successors, (556), 167 states have internal predecessors, (556), 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 332 [2022-11-19 07:17:47,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:17:47,776 INFO L225 Difference]: With dead ends: 718 [2022-11-19 07:17:47,776 INFO L226 Difference]: Without dead ends: 497 [2022-11-19 07:17:47,779 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1159 GetRequests, 825 SyntacticMatches, 106 SemanticMatches, 228 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20145 ImplicationChecksByTransitivity, 15.0s TimeCoverageRelationStatistics Valid=12297, Invalid=40373, Unknown=0, NotChecked=0, Total=52670 [2022-11-19 07:17:47,779 INFO L413 NwaCegarLoop]: 110 mSDtfsCounter, 584 mSDsluCounter, 1150 mSDsCounter, 0 mSdLazyCounter, 1324 mSolverCounterSat, 433 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 584 SdHoareTripleChecker+Valid, 1260 SdHoareTripleChecker+Invalid, 1757 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 433 IncrementalHoareTripleChecker+Valid, 1324 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-19 07:17:47,779 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [584 Valid, 1260 Invalid, 1757 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [433 Valid, 1324 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-19 07:17:47,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 497 states. [2022-11-19 07:17:47,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 497 to 335. [2022-11-19 07:17:47,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 334 states have (on average 1.0089820359281436) internal successors, (337), 334 states have internal predecessors, (337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:17:47,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 337 transitions. [2022-11-19 07:17:47,843 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 337 transitions. Word has length 332 [2022-11-19 07:17:47,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:17:47,843 INFO L495 AbstractCegarLoop]: Abstraction has 335 states and 337 transitions. [2022-11-19 07:17:47,843 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 167 states, 167 states have (on average 3.3293413173652695) internal successors, (556), 167 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:17:47,843 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 337 transitions. [2022-11-19 07:17:47,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2022-11-19 07:17:47,844 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:17:47,844 INFO L195 NwaCegarLoop]: trace histogram [55, 55, 54, 54, 54, 54, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:17:47,850 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Forceful destruction successful, exit code 0 [2022-11-19 07:17:48,045 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:17:48,045 INFO L420 AbstractCegarLoop]: === Iteration 83 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:17:48,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:17:48,045 INFO L85 PathProgramCache]: Analyzing trace with hash -89161152, now seen corresponding path program 80 times [2022-11-19 07:17:48,045 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:17:48,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [40458663] [2022-11-19 07:17:48,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:17:48,046 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:17:48,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:17:54,440 INFO L134 CoverageAnalysis]: Checked inductivity of 8802 backedges. 5673 proven. 3129 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:17:54,440 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:17:54,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [40458663] [2022-11-19 07:17:54,440 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [40458663] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:17:54,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2024827356] [2022-11-19 07:17:54,440 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:17:54,440 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:17:54,441 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:17:54,441 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:17:54,443 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2022-11-19 07:17:54,862 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 55 check-sat command(s) [2022-11-19 07:17:54,863 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:17:54,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 1235 conjuncts, 112 conjunts are in the unsatisfiable core [2022-11-19 07:17:54,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:18:00,469 INFO L134 CoverageAnalysis]: Checked inductivity of 8802 backedges. 5832 proven. 2970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:18:00,469 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:18:04,679 INFO L134 CoverageAnalysis]: Checked inductivity of 8802 backedges. 5832 proven. 2970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:18:04,679 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2024827356] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:18:04,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1203204425] [2022-11-19 07:18:04,680 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:18:04,680 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:18:04,680 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:18:04,680 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:18:04,680 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:18:04,772 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:18:06,015 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '152678#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:18:06,015 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:18:06,015 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:18:06,015 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [112, 112, 112] total 169 [2022-11-19 07:18:06,016 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99810999] [2022-11-19 07:18:06,016 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:18:06,016 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 169 states [2022-11-19 07:18:06,016 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:18:06,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 169 interpolants. [2022-11-19 07:18:06,020 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6525, Invalid=24981, Unknown=0, NotChecked=0, Total=31506 [2022-11-19 07:18:06,021 INFO L87 Difference]: Start difference. First operand 335 states and 337 transitions. Second operand has 169 states, 169 states have (on average 3.301775147928994) internal successors, (558), 169 states have internal predecessors, (558), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:18:10,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:18:10,521 INFO L93 Difference]: Finished difference Result 725 states and 783 transitions. [2022-11-19 07:18:10,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2022-11-19 07:18:10,521 INFO L78 Accepts]: Start accepts. Automaton has has 169 states, 169 states have (on average 3.301775147928994) internal successors, (558), 169 states have internal predecessors, (558), 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 334 [2022-11-19 07:18:10,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:18:10,522 INFO L225 Difference]: With dead ends: 725 [2022-11-19 07:18:10,522 INFO L226 Difference]: Without dead ends: 502 [2022-11-19 07:18:10,526 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1167 GetRequests, 828 SyntacticMatches, 108 SemanticMatches, 231 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20620 ImplicationChecksByTransitivity, 15.4s TimeCoverageRelationStatistics Valid=12687, Invalid=41369, Unknown=0, NotChecked=0, Total=54056 [2022-11-19 07:18:10,526 INFO L413 NwaCegarLoop]: 112 mSDtfsCounter, 522 mSDsluCounter, 1195 mSDsCounter, 0 mSdLazyCounter, 1371 mSolverCounterSat, 460 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 522 SdHoareTripleChecker+Valid, 1307 SdHoareTripleChecker+Invalid, 1831 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 460 IncrementalHoareTripleChecker+Valid, 1371 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-19 07:18:10,526 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [522 Valid, 1307 Invalid, 1831 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [460 Valid, 1371 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-19 07:18:10,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 502 states. [2022-11-19 07:18:10,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 502 to 337. [2022-11-19 07:18:10,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 336 states have (on average 1.0089285714285714) internal successors, (339), 336 states have internal predecessors, (339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:18:10,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 339 transitions. [2022-11-19 07:18:10,604 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 339 transitions. Word has length 334 [2022-11-19 07:18:10,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:18:10,604 INFO L495 AbstractCegarLoop]: Abstraction has 337 states and 339 transitions. [2022-11-19 07:18:10,604 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 169 states, 169 states have (on average 3.301775147928994) internal successors, (558), 169 states have internal predecessors, (558), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:18:10,604 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 339 transitions. [2022-11-19 07:18:10,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 337 [2022-11-19 07:18:10,605 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:18:10,605 INFO L195 NwaCegarLoop]: trace histogram [56, 55, 55, 54, 54, 54, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:18:10,611 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Forceful destruction successful, exit code 0 [2022-11-19 07:18:10,806 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:18:10,806 INFO L420 AbstractCegarLoop]: === Iteration 84 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:18:10,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:18:10,806 INFO L85 PathProgramCache]: Analyzing trace with hash -209691931, now seen corresponding path program 81 times [2022-11-19 07:18:10,806 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:18:10,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1856093470] [2022-11-19 07:18:10,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:18:10,807 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:18:10,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:18:14,824 INFO L134 CoverageAnalysis]: Checked inductivity of 8912 backedges. 2970 proven. 5942 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:18:14,824 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:18:14,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1856093470] [2022-11-19 07:18:14,824 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1856093470] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:18:14,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [270409198] [2022-11-19 07:18:14,824 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:18:14,824 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:18:14,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:18:14,825 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:18:14,827 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2022-11-19 07:18:15,050 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:18:15,050 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:18:15,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 1245 conjuncts, 116 conjunts are in the unsatisfiable core [2022-11-19 07:18:15,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:18:15,498 INFO L134 CoverageAnalysis]: Checked inductivity of 8912 backedges. 3080 proven. 5832 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:18:15,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:18:18,318 INFO L134 CoverageAnalysis]: Checked inductivity of 8912 backedges. 3080 proven. 5832 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:18:18,318 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [270409198] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:18:18,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [746914809] [2022-11-19 07:18:18,320 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:18:18,320 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:18:18,320 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:18:18,320 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:18:18,320 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:18:18,416 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:18:19,052 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '156428#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:18:19,052 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:18:19,052 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:18:19,052 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 61 [2022-11-19 07:18:19,052 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097970463] [2022-11-19 07:18:19,053 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:18:19,053 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2022-11-19 07:18:19,053 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:18:19,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2022-11-19 07:18:19,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1763, Invalid=3207, Unknown=0, NotChecked=0, Total=4970 [2022-11-19 07:18:19,054 INFO L87 Difference]: Start difference. First operand 337 states and 339 transitions. Second operand has 62 states, 62 states have (on average 5.758064516129032) internal successors, (357), 61 states have internal predecessors, (357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:18:20,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:18:20,707 INFO L93 Difference]: Finished difference Result 354 states and 357 transitions. [2022-11-19 07:18:20,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2022-11-19 07:18:20,707 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 5.758064516129032) internal successors, (357), 61 states have internal predecessors, (357), 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 336 [2022-11-19 07:18:20,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:18:20,708 INFO L225 Difference]: With dead ends: 354 [2022-11-19 07:18:20,708 INFO L226 Difference]: Without dead ends: 352 [2022-11-19 07:18:20,710 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1176 GetRequests, 941 SyntacticMatches, 108 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7756 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=5306, Invalid=11206, Unknown=0, NotChecked=0, Total=16512 [2022-11-19 07:18:20,710 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 464 mSDsluCounter, 451 mSDsCounter, 0 mSdLazyCounter, 604 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 464 SdHoareTripleChecker+Valid, 515 SdHoareTripleChecker+Invalid, 665 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 604 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:18:20,710 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [464 Valid, 515 Invalid, 665 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 604 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:18:20,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2022-11-19 07:18:20,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 345. [2022-11-19 07:18:20,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 345 states, 344 states have (on average 1.0087209302325582) internal successors, (347), 344 states have internal predecessors, (347), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:18:20,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 345 states to 345 states and 347 transitions. [2022-11-19 07:18:20,769 INFO L78 Accepts]: Start accepts. Automaton has 345 states and 347 transitions. Word has length 336 [2022-11-19 07:18:20,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:18:20,769 INFO L495 AbstractCegarLoop]: Abstraction has 345 states and 347 transitions. [2022-11-19 07:18:20,769 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 5.758064516129032) internal successors, (357), 61 states have internal predecessors, (357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:18:20,769 INFO L276 IsEmpty]: Start isEmpty. Operand 345 states and 347 transitions. [2022-11-19 07:18:20,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2022-11-19 07:18:20,770 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:18:20,770 INFO L195 NwaCegarLoop]: trace histogram [57, 56, 56, 56, 56, 55, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:18:20,776 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Ended with exit code 0 [2022-11-19 07:18:20,971 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:18:20,971 INFO L420 AbstractCegarLoop]: === Iteration 85 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:18:20,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:18:20,971 INFO L85 PathProgramCache]: Analyzing trace with hash -846596149, now seen corresponding path program 82 times [2022-11-19 07:18:20,971 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:18:20,971 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1282888860] [2022-11-19 07:18:20,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:18:20,972 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:18:21,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:18:27,618 INFO L134 CoverageAnalysis]: Checked inductivity of 9352 backedges. 6107 proven. 3245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:18:27,618 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:18:27,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1282888860] [2022-11-19 07:18:27,618 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1282888860] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:18:27,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2051170177] [2022-11-19 07:18:27,618 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:18:27,619 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:18:27,619 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:18:27,619 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:18:27,622 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Waiting until timeout for monitored process [2022-11-19 07:18:27,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:18:27,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 1269 conjuncts, 114 conjunts are in the unsatisfiable core [2022-11-19 07:18:27,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:18:33,622 INFO L134 CoverageAnalysis]: Checked inductivity of 9352 backedges. 6270 proven. 3080 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:18:33,623 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:18:38,018 INFO L134 CoverageAnalysis]: Checked inductivity of 9352 backedges. 6270 proven. 3080 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:18:38,018 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2051170177] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:18:38,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [685748928] [2022-11-19 07:18:38,019 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:18:38,019 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:18:38,019 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:18:38,019 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:18:38,020 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:18:38,113 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:18:39,371 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '159826#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:18:39,371 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:18:39,371 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:18:39,372 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [115, 114, 114] total 173 [2022-11-19 07:18:39,372 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951681981] [2022-11-19 07:18:39,372 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:18:39,372 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 173 states [2022-11-19 07:18:39,372 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:18:39,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 173 interpolants. [2022-11-19 07:18:39,374 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6813, Invalid=26129, Unknown=0, NotChecked=0, Total=32942 [2022-11-19 07:18:39,375 INFO L87 Difference]: Start difference. First operand 345 states and 347 transitions. Second operand has 173 states, 173 states have (on average 3.3294797687861273) internal successors, (576), 173 states have internal predecessors, (576), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:18:44,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:18:44,053 INFO L93 Difference]: Finished difference Result 744 states and 803 transitions. [2022-11-19 07:18:44,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2022-11-19 07:18:44,053 INFO L78 Accepts]: Start accepts. Automaton has has 173 states, 173 states have (on average 3.3294797687861273) internal successors, (576), 173 states have internal predecessors, (576), 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 344 [2022-11-19 07:18:44,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:18:44,055 INFO L225 Difference]: With dead ends: 744 [2022-11-19 07:18:44,055 INFO L226 Difference]: Without dead ends: 515 [2022-11-19 07:18:44,058 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1201 GetRequests, 855 SyntacticMatches, 110 SemanticMatches, 236 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21563 ImplicationChecksByTransitivity, 16.0s TimeCoverageRelationStatistics Valid=13199, Invalid=43207, Unknown=0, NotChecked=0, Total=56406 [2022-11-19 07:18:44,059 INFO L413 NwaCegarLoop]: 114 mSDtfsCounter, 637 mSDsluCounter, 1247 mSDsCounter, 0 mSdLazyCounter, 1440 mSolverCounterSat, 521 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 637 SdHoareTripleChecker+Valid, 1361 SdHoareTripleChecker+Invalid, 1961 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 521 IncrementalHoareTripleChecker+Valid, 1440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-19 07:18:44,059 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [637 Valid, 1361 Invalid, 1961 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [521 Valid, 1440 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-19 07:18:44,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 515 states. [2022-11-19 07:18:44,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 515 to 347. [2022-11-19 07:18:44,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 347 states, 346 states have (on average 1.0086705202312138) internal successors, (349), 346 states have internal predecessors, (349), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:18:44,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 347 states to 347 states and 349 transitions. [2022-11-19 07:18:44,119 INFO L78 Accepts]: Start accepts. Automaton has 347 states and 349 transitions. Word has length 344 [2022-11-19 07:18:44,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:18:44,119 INFO L495 AbstractCegarLoop]: Abstraction has 347 states and 349 transitions. [2022-11-19 07:18:44,119 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 173 states, 173 states have (on average 3.3294797687861273) internal successors, (576), 173 states have internal predecessors, (576), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:18:44,120 INFO L276 IsEmpty]: Start isEmpty. Operand 347 states and 349 transitions. [2022-11-19 07:18:44,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2022-11-19 07:18:44,121 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:18:44,121 INFO L195 NwaCegarLoop]: trace histogram [57, 57, 56, 56, 56, 56, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:18:44,131 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Forceful destruction successful, exit code 0 [2022-11-19 07:18:44,321 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:18:44,322 INFO L420 AbstractCegarLoop]: === Iteration 86 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:18:44,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:18:44,322 INFO L85 PathProgramCache]: Analyzing trace with hash -258734544, now seen corresponding path program 83 times [2022-11-19 07:18:44,322 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:18:44,322 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [761681149] [2022-11-19 07:18:44,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:18:44,323 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:18:44,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:18:51,001 INFO L134 CoverageAnalysis]: Checked inductivity of 9464 backedges. 6107 proven. 3357 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:18:51,001 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:18:51,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [761681149] [2022-11-19 07:18:51,002 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [761681149] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:18:51,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1497845451] [2022-11-19 07:18:51,002 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:18:51,002 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:18:51,002 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:18:51,003 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:18:51,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2022-11-19 07:18:51,442 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 57 check-sat command(s) [2022-11-19 07:18:51,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:18:51,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 1279 conjuncts, 116 conjunts are in the unsatisfiable core [2022-11-19 07:18:51,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:18:57,401 INFO L134 CoverageAnalysis]: Checked inductivity of 9464 backedges. 6272 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:18:57,401 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:19:01,916 INFO L134 CoverageAnalysis]: Checked inductivity of 9464 backedges. 6272 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:19:01,917 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1497845451] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:19:01,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1875508294] [2022-11-19 07:19:01,918 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:19:01,918 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:19:01,918 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:19:01,918 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:19:01,918 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:19:02,031 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:19:03,304 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '163794#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:19:03,304 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:19:03,304 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:19:03,304 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [116, 116, 116] total 175 [2022-11-19 07:19:03,304 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826886989] [2022-11-19 07:19:03,304 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:19:03,305 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 175 states [2022-11-19 07:19:03,305 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:19:03,307 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 175 interpolants. [2022-11-19 07:19:03,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6989, Invalid=26683, Unknown=0, NotChecked=0, Total=33672 [2022-11-19 07:19:03,308 INFO L87 Difference]: Start difference. First operand 347 states and 349 transitions. Second operand has 175 states, 175 states have (on average 3.302857142857143) internal successors, (578), 175 states have internal predecessors, (578), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:19:08,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:19:08,161 INFO L93 Difference]: Finished difference Result 751 states and 811 transitions. [2022-11-19 07:19:08,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2022-11-19 07:19:08,161 INFO L78 Accepts]: Start accepts. Automaton has has 175 states, 175 states have (on average 3.302857142857143) internal successors, (578), 175 states have internal predecessors, (578), 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 346 [2022-11-19 07:19:08,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:19:08,163 INFO L225 Difference]: With dead ends: 751 [2022-11-19 07:19:08,163 INFO L226 Difference]: Without dead ends: 520 [2022-11-19 07:19:08,167 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1209 GetRequests, 858 SyntacticMatches, 112 SemanticMatches, 239 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22054 ImplicationChecksByTransitivity, 16.4s TimeCoverageRelationStatistics Valid=13603, Invalid=44237, Unknown=0, NotChecked=0, Total=57840 [2022-11-19 07:19:08,167 INFO L413 NwaCegarLoop]: 116 mSDtfsCounter, 593 mSDsluCounter, 1330 mSDsCounter, 0 mSdLazyCounter, 1508 mSolverCounterSat, 387 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 593 SdHoareTripleChecker+Valid, 1446 SdHoareTripleChecker+Invalid, 1895 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 387 IncrementalHoareTripleChecker+Valid, 1508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-19 07:19:08,167 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [593 Valid, 1446 Invalid, 1895 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [387 Valid, 1508 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-19 07:19:08,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2022-11-19 07:19:08,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 349. [2022-11-19 07:19:08,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 348 states have (on average 1.0086206896551724) internal successors, (351), 348 states have internal predecessors, (351), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:19:08,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 351 transitions. [2022-11-19 07:19:08,235 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 351 transitions. Word has length 346 [2022-11-19 07:19:08,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:19:08,235 INFO L495 AbstractCegarLoop]: Abstraction has 349 states and 351 transitions. [2022-11-19 07:19:08,235 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 175 states, 175 states have (on average 3.302857142857143) internal successors, (578), 175 states have internal predecessors, (578), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:19:08,236 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 351 transitions. [2022-11-19 07:19:08,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 349 [2022-11-19 07:19:08,237 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:19:08,237 INFO L195 NwaCegarLoop]: trace histogram [58, 57, 57, 56, 56, 56, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:19:08,243 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Forceful destruction successful, exit code 0 [2022-11-19 07:19:08,437 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable85 [2022-11-19 07:19:08,438 INFO L420 AbstractCegarLoop]: === Iteration 87 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:19:08,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:19:08,438 INFO L85 PathProgramCache]: Analyzing trace with hash 2035552085, now seen corresponding path program 84 times [2022-11-19 07:19:08,438 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:19:08,438 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [26925881] [2022-11-19 07:19:08,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:19:08,438 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:19:08,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:19:12,475 INFO L134 CoverageAnalysis]: Checked inductivity of 9578 backedges. 3192 proven. 6386 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:19:12,476 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:19:12,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [26925881] [2022-11-19 07:19:12,476 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [26925881] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:19:12,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1083053003] [2022-11-19 07:19:12,477 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:19:12,477 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:19:12,477 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:19:12,479 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:19:12,481 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2022-11-19 07:19:12,714 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:19:12,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:19:12,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 1289 conjuncts, 120 conjunts are in the unsatisfiable core [2022-11-19 07:19:12,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:19:13,196 INFO L134 CoverageAnalysis]: Checked inductivity of 9578 backedges. 3306 proven. 6272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:19:13,196 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:19:16,142 INFO L134 CoverageAnalysis]: Checked inductivity of 9578 backedges. 3306 proven. 6272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:19:16,142 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1083053003] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:19:16,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [624182830] [2022-11-19 07:19:16,143 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:19:16,143 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:19:16,144 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:19:16,144 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:19:16,144 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:19:16,230 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:19:16,879 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '167678#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:19:16,879 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:19:16,879 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:19:16,879 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 63 [2022-11-19 07:19:16,879 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456753112] [2022-11-19 07:19:16,879 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:19:16,880 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-11-19 07:19:16,880 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:19:16,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-11-19 07:19:16,881 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1882, Invalid=3374, Unknown=0, NotChecked=0, Total=5256 [2022-11-19 07:19:16,881 INFO L87 Difference]: Start difference. First operand 349 states and 351 transitions. Second operand has 64 states, 64 states have (on average 5.765625) internal successors, (369), 63 states have internal predecessors, (369), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:19:18,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:19:18,659 INFO L93 Difference]: Finished difference Result 366 states and 369 transitions. [2022-11-19 07:19:18,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2022-11-19 07:19:18,660 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 5.765625) internal successors, (369), 63 states have internal predecessors, (369), 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 348 [2022-11-19 07:19:18,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:19:18,661 INFO L225 Difference]: With dead ends: 366 [2022-11-19 07:19:18,661 INFO L226 Difference]: Without dead ends: 364 [2022-11-19 07:19:18,662 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1218 GetRequests, 975 SyntacticMatches, 112 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8264 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=5667, Invalid=11889, Unknown=0, NotChecked=0, Total=17556 [2022-11-19 07:19:18,662 INFO L413 NwaCegarLoop]: 66 mSDtfsCounter, 363 mSDsluCounter, 522 mSDsCounter, 0 mSdLazyCounter, 685 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 363 SdHoareTripleChecker+Valid, 588 SdHoareTripleChecker+Invalid, 748 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 685 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:19:18,663 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [363 Valid, 588 Invalid, 748 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 685 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:19:18,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 364 states. [2022-11-19 07:19:18,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 364 to 357. [2022-11-19 07:19:18,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 357 states, 356 states have (on average 1.0084269662921348) internal successors, (359), 356 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:19:18,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 357 states to 357 states and 359 transitions. [2022-11-19 07:19:18,745 INFO L78 Accepts]: Start accepts. Automaton has 357 states and 359 transitions. Word has length 348 [2022-11-19 07:19:18,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:19:18,746 INFO L495 AbstractCegarLoop]: Abstraction has 357 states and 359 transitions. [2022-11-19 07:19:18,746 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 5.765625) internal successors, (369), 63 states have internal predecessors, (369), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:19:18,746 INFO L276 IsEmpty]: Start isEmpty. Operand 357 states and 359 transitions. [2022-11-19 07:19:18,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 357 [2022-11-19 07:19:18,747 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:19:18,747 INFO L195 NwaCegarLoop]: trace histogram [59, 58, 58, 58, 58, 57, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:19:18,754 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Forceful destruction successful, exit code 0 [2022-11-19 07:19:18,948 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:19:18,948 INFO L420 AbstractCegarLoop]: === Iteration 88 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:19:18,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:19:18,948 INFO L85 PathProgramCache]: Analyzing trace with hash -866501573, now seen corresponding path program 85 times [2022-11-19 07:19:18,948 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:19:18,949 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530258662] [2022-11-19 07:19:18,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:19:18,949 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:19:19,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:19:25,950 INFO L134 CoverageAnalysis]: Checked inductivity of 10034 backedges. 6557 proven. 3477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:19:25,951 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:19:25,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530258662] [2022-11-19 07:19:25,955 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1530258662] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:19:25,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [912347823] [2022-11-19 07:19:25,955 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:19:25,955 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:19:25,956 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:19:25,957 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:19:25,961 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Waiting until timeout for monitored process [2022-11-19 07:19:26,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:19:26,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 1313 conjuncts, 118 conjunts are in the unsatisfiable core [2022-11-19 07:19:26,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:19:32,329 INFO L134 CoverageAnalysis]: Checked inductivity of 10034 backedges. 6726 proven. 3306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:19:32,329 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:19:36,987 INFO L134 CoverageAnalysis]: Checked inductivity of 10034 backedges. 6726 proven. 3306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:19:36,987 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [912347823] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:19:36,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [366886867] [2022-11-19 07:19:36,988 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:19:36,988 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:19:36,989 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:19:36,989 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:19:36,989 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:19:37,074 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:19:38,363 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '171194#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:19:38,364 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:19:38,364 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:19:38,364 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [119, 118, 118] total 179 [2022-11-19 07:19:38,364 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281164266] [2022-11-19 07:19:38,364 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:19:38,365 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 179 states [2022-11-19 07:19:38,366 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:19:38,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 179 interpolants. [2022-11-19 07:19:38,368 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7287, Invalid=27869, Unknown=0, NotChecked=0, Total=35156 [2022-11-19 07:19:38,369 INFO L87 Difference]: Start difference. First operand 357 states and 359 transitions. Second operand has 179 states, 179 states have (on average 3.329608938547486) internal successors, (596), 179 states have internal predecessors, (596), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:19:43,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:19:43,432 INFO L93 Difference]: Finished difference Result 770 states and 831 transitions. [2022-11-19 07:19:43,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2022-11-19 07:19:43,433 INFO L78 Accepts]: Start accepts. Automaton has has 179 states, 179 states have (on average 3.329608938547486) internal successors, (596), 179 states have internal predecessors, (596), 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 356 [2022-11-19 07:19:43,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:19:43,434 INFO L225 Difference]: With dead ends: 770 [2022-11-19 07:19:43,434 INFO L226 Difference]: Without dead ends: 533 [2022-11-19 07:19:43,438 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1243 GetRequests, 885 SyntacticMatches, 114 SemanticMatches, 244 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23029 ImplicationChecksByTransitivity, 17.1s TimeCoverageRelationStatistics Valid=14133, Invalid=46137, Unknown=0, NotChecked=0, Total=60270 [2022-11-19 07:19:43,438 INFO L413 NwaCegarLoop]: 118 mSDtfsCounter, 566 mSDsluCounter, 1489 mSDsCounter, 0 mSdLazyCounter, 1656 mSolverCounterSat, 318 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 566 SdHoareTripleChecker+Valid, 1607 SdHoareTripleChecker+Invalid, 1974 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 318 IncrementalHoareTripleChecker+Valid, 1656 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-19 07:19:43,438 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [566 Valid, 1607 Invalid, 1974 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [318 Valid, 1656 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-19 07:19:43,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 533 states. [2022-11-19 07:19:43,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 533 to 359. [2022-11-19 07:19:43,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 359 states, 358 states have (on average 1.0083798882681565) internal successors, (361), 358 states have internal predecessors, (361), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:19:43,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 359 states to 359 states and 361 transitions. [2022-11-19 07:19:43,501 INFO L78 Accepts]: Start accepts. Automaton has 359 states and 361 transitions. Word has length 356 [2022-11-19 07:19:43,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:19:43,502 INFO L495 AbstractCegarLoop]: Abstraction has 359 states and 361 transitions. [2022-11-19 07:19:43,502 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 179 states, 179 states have (on average 3.329608938547486) internal successors, (596), 179 states have internal predecessors, (596), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:19:43,502 INFO L276 IsEmpty]: Start isEmpty. Operand 359 states and 361 transitions. [2022-11-19 07:19:43,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 359 [2022-11-19 07:19:43,504 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:19:43,504 INFO L195 NwaCegarLoop]: trace histogram [59, 59, 58, 58, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:19:43,509 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Forceful destruction successful, exit code 0 [2022-11-19 07:19:43,704 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable87,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:19:43,704 INFO L420 AbstractCegarLoop]: === Iteration 89 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:19:43,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:19:43,705 INFO L85 PathProgramCache]: Analyzing trace with hash -193930464, now seen corresponding path program 86 times [2022-11-19 07:19:43,705 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:19:43,705 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1469396862] [2022-11-19 07:19:43,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:19:43,705 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:19:43,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:19:50,859 INFO L134 CoverageAnalysis]: Checked inductivity of 10150 backedges. 6557 proven. 3593 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:19:50,859 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:19:50,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1469396862] [2022-11-19 07:19:50,860 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1469396862] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:19:50,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [37855449] [2022-11-19 07:19:50,860 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:19:50,860 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:19:50,860 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:19:50,861 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:19:50,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Waiting until timeout for monitored process [2022-11-19 07:19:51,325 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 59 check-sat command(s) [2022-11-19 07:19:51,326 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:19:51,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 1323 conjuncts, 120 conjunts are in the unsatisfiable core [2022-11-19 07:19:51,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:19:57,644 INFO L134 CoverageAnalysis]: Checked inductivity of 10150 backedges. 6728 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:19:57,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:20:02,421 INFO L134 CoverageAnalysis]: Checked inductivity of 10150 backedges. 6728 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:20:02,422 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [37855449] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:20:02,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [69660501] [2022-11-19 07:20:02,423 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:20:02,423 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:20:02,423 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:20:02,423 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:20:02,423 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:20:02,550 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:20:03,848 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '175300#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:20:03,848 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:20:03,848 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:20:03,849 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [120, 120, 120] total 181 [2022-11-19 07:20:03,849 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842081812] [2022-11-19 07:20:03,849 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:20:03,849 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 181 states [2022-11-19 07:20:03,849 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:20:03,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 181 interpolants. [2022-11-19 07:20:03,852 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7469, Invalid=28441, Unknown=0, NotChecked=0, Total=35910 [2022-11-19 07:20:03,852 INFO L87 Difference]: Start difference. First operand 359 states and 361 transitions. Second operand has 181 states, 181 states have (on average 3.303867403314917) internal successors, (598), 181 states have internal predecessors, (598), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:20:09,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:20:09,134 INFO L93 Difference]: Finished difference Result 777 states and 839 transitions. [2022-11-19 07:20:09,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2022-11-19 07:20:09,134 INFO L78 Accepts]: Start accepts. Automaton has has 181 states, 181 states have (on average 3.303867403314917) internal successors, (598), 181 states have internal predecessors, (598), 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 358 [2022-11-19 07:20:09,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:20:09,135 INFO L225 Difference]: With dead ends: 777 [2022-11-19 07:20:09,135 INFO L226 Difference]: Without dead ends: 538 [2022-11-19 07:20:09,139 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1251 GetRequests, 888 SyntacticMatches, 116 SemanticMatches, 247 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23536 ImplicationChecksByTransitivity, 17.5s TimeCoverageRelationStatistics Valid=14551, Invalid=47201, Unknown=0, NotChecked=0, Total=61752 [2022-11-19 07:20:09,140 INFO L413 NwaCegarLoop]: 120 mSDtfsCounter, 724 mSDsluCounter, 1318 mSDsCounter, 0 mSdLazyCounter, 1502 mSolverCounterSat, 696 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 724 SdHoareTripleChecker+Valid, 1438 SdHoareTripleChecker+Invalid, 2198 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 696 IncrementalHoareTripleChecker+Valid, 1502 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:20:09,140 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [724 Valid, 1438 Invalid, 2198 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [696 Valid, 1502 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-19 07:20:09,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 538 states. [2022-11-19 07:20:09,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 538 to 361. [2022-11-19 07:20:09,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 361 states, 360 states have (on average 1.0083333333333333) internal successors, (363), 360 states have internal predecessors, (363), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:20:09,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 361 states to 361 states and 363 transitions. [2022-11-19 07:20:09,253 INFO L78 Accepts]: Start accepts. Automaton has 361 states and 363 transitions. Word has length 358 [2022-11-19 07:20:09,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:20:09,254 INFO L495 AbstractCegarLoop]: Abstraction has 361 states and 363 transitions. [2022-11-19 07:20:09,254 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 181 states, 181 states have (on average 3.303867403314917) internal successors, (598), 181 states have internal predecessors, (598), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:20:09,254 INFO L276 IsEmpty]: Start isEmpty. Operand 361 states and 363 transitions. [2022-11-19 07:20:09,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 361 [2022-11-19 07:20:09,256 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:20:09,256 INFO L195 NwaCegarLoop]: trace histogram [60, 59, 59, 58, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:20:09,265 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Ended with exit code 0 [2022-11-19 07:20:09,463 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable88,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:20:09,464 INFO L420 AbstractCegarLoop]: === Iteration 90 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:20:09,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:20:09,464 INFO L85 PathProgramCache]: Analyzing trace with hash 1901810885, now seen corresponding path program 87 times [2022-11-19 07:20:09,464 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:20:09,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2027220125] [2022-11-19 07:20:09,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:20:09,464 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:20:09,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:20:13,907 INFO L134 CoverageAnalysis]: Checked inductivity of 10268 backedges. 3422 proven. 6846 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:20:13,907 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:20:13,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2027220125] [2022-11-19 07:20:13,908 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2027220125] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:20:13,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1806933202] [2022-11-19 07:20:13,908 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:20:13,908 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:20:13,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:20:13,909 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:20:13,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2022-11-19 07:20:14,146 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:20:14,146 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:20:14,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 1333 conjuncts, 124 conjunts are in the unsatisfiable core [2022-11-19 07:20:14,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:20:14,619 INFO L134 CoverageAnalysis]: Checked inductivity of 10268 backedges. 3540 proven. 6728 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:20:14,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:20:17,820 INFO L134 CoverageAnalysis]: Checked inductivity of 10268 backedges. 3540 proven. 6728 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:20:17,820 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1806933202] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:20:17,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1425705374] [2022-11-19 07:20:17,822 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:20:17,822 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:20:17,822 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:20:17,822 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:20:17,822 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:20:17,914 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:20:18,599 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '179318#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:20:18,600 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:20:18,600 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:20:18,600 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 65 [2022-11-19 07:20:18,600 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636852736] [2022-11-19 07:20:18,600 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:20:18,601 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2022-11-19 07:20:18,602 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:20:18,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2022-11-19 07:20:18,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2005, Invalid=3545, Unknown=0, NotChecked=0, Total=5550 [2022-11-19 07:20:18,603 INFO L87 Difference]: Start difference. First operand 361 states and 363 transitions. Second operand has 66 states, 66 states have (on average 5.7727272727272725) internal successors, (381), 65 states have internal predecessors, (381), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:20:20,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:20:20,428 INFO L93 Difference]: Finished difference Result 378 states and 381 transitions. [2022-11-19 07:20:20,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2022-11-19 07:20:20,429 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 5.7727272727272725) internal successors, (381), 65 states have internal predecessors, (381), 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 360 [2022-11-19 07:20:20,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:20:20,431 INFO L225 Difference]: With dead ends: 378 [2022-11-19 07:20:20,431 INFO L226 Difference]: Without dead ends: 376 [2022-11-19 07:20:20,432 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1260 GetRequests, 1009 SyntacticMatches, 116 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8788 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=6040, Invalid=12592, Unknown=0, NotChecked=0, Total=18632 [2022-11-19 07:20:20,433 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 556 mSDsluCounter, 427 mSDsCounter, 0 mSdLazyCounter, 586 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 556 SdHoareTripleChecker+Valid, 495 SdHoareTripleChecker+Invalid, 651 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 586 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:20:20,433 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [556 Valid, 495 Invalid, 651 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 586 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:20:20,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2022-11-19 07:20:20,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 369. [2022-11-19 07:20:20,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 369 states, 368 states have (on average 1.0081521739130435) internal successors, (371), 368 states have internal predecessors, (371), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:20:20,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 369 states to 369 states and 371 transitions. [2022-11-19 07:20:20,502 INFO L78 Accepts]: Start accepts. Automaton has 369 states and 371 transitions. Word has length 360 [2022-11-19 07:20:20,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:20:20,502 INFO L495 AbstractCegarLoop]: Abstraction has 369 states and 371 transitions. [2022-11-19 07:20:20,502 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 5.7727272727272725) internal successors, (381), 65 states have internal predecessors, (381), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:20:20,502 INFO L276 IsEmpty]: Start isEmpty. Operand 369 states and 371 transitions. [2022-11-19 07:20:20,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 369 [2022-11-19 07:20:20,504 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:20:20,504 INFO L195 NwaCegarLoop]: trace histogram [61, 60, 60, 60, 60, 59, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:20:20,510 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Forceful destruction successful, exit code 0 [2022-11-19 07:20:20,707 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable89,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:20:20,707 INFO L420 AbstractCegarLoop]: === Iteration 91 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:20:20,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:20:20,707 INFO L85 PathProgramCache]: Analyzing trace with hash 490541483, now seen corresponding path program 88 times [2022-11-19 07:20:20,707 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:20:20,708 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1117388240] [2022-11-19 07:20:20,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:20:20,708 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:20:20,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:20:28,459 INFO L134 CoverageAnalysis]: Checked inductivity of 10740 backedges. 7023 proven. 3717 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:20:28,459 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:20:28,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1117388240] [2022-11-19 07:20:28,460 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1117388240] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:20:28,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1126959783] [2022-11-19 07:20:28,460 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:20:28,460 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:20:28,460 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:20:28,461 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:20:28,463 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Waiting until timeout for monitored process [2022-11-19 07:20:28,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:20:28,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 1357 conjuncts, 122 conjunts are in the unsatisfiable core [2022-11-19 07:20:28,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:20:35,267 INFO L134 CoverageAnalysis]: Checked inductivity of 10740 backedges. 7198 proven. 3540 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:20:35,267 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:20:40,367 INFO L134 CoverageAnalysis]: Checked inductivity of 10740 backedges. 7198 proven. 3540 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:20:40,367 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1126959783] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:20:40,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [937994278] [2022-11-19 07:20:40,368 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:20:40,369 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:20:40,369 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:20:40,369 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:20:40,369 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:20:40,477 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:20:41,831 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '182952#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:20:41,831 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:20:41,831 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:20:41,832 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [123, 122, 122] total 185 [2022-11-19 07:20:41,832 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813135757] [2022-11-19 07:20:41,832 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:20:41,833 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 185 states [2022-11-19 07:20:41,833 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:20:41,834 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 185 interpolants. [2022-11-19 07:20:41,835 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7777, Invalid=29665, Unknown=0, NotChecked=0, Total=37442 [2022-11-19 07:20:41,835 INFO L87 Difference]: Start difference. First operand 369 states and 371 transitions. Second operand has 185 states, 185 states have (on average 3.32972972972973) internal successors, (616), 185 states have internal predecessors, (616), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:20:47,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:20:47,344 INFO L93 Difference]: Finished difference Result 796 states and 859 transitions. [2022-11-19 07:20:47,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2022-11-19 07:20:47,345 INFO L78 Accepts]: Start accepts. Automaton has has 185 states, 185 states have (on average 3.32972972972973) internal successors, (616), 185 states have internal predecessors, (616), 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 368 [2022-11-19 07:20:47,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:20:47,346 INFO L225 Difference]: With dead ends: 796 [2022-11-19 07:20:47,346 INFO L226 Difference]: Without dead ends: 551 [2022-11-19 07:20:47,349 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1285 GetRequests, 915 SyntacticMatches, 118 SemanticMatches, 252 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24543 ImplicationChecksByTransitivity, 18.4s TimeCoverageRelationStatistics Valid=15099, Invalid=49163, Unknown=0, NotChecked=0, Total=64262 [2022-11-19 07:20:47,349 INFO L413 NwaCegarLoop]: 122 mSDtfsCounter, 606 mSDsluCounter, 1516 mSDsCounter, 0 mSdLazyCounter, 1705 mSolverCounterSat, 519 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 606 SdHoareTripleChecker+Valid, 1638 SdHoareTripleChecker+Invalid, 2224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 519 IncrementalHoareTripleChecker+Valid, 1705 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:20:47,349 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [606 Valid, 1638 Invalid, 2224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [519 Valid, 1705 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-19 07:20:47,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 551 states. [2022-11-19 07:20:47,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 551 to 371. [2022-11-19 07:20:47,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 371 states, 370 states have (on average 1.008108108108108) internal successors, (373), 370 states have internal predecessors, (373), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:20:47,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 371 states to 371 states and 373 transitions. [2022-11-19 07:20:47,420 INFO L78 Accepts]: Start accepts. Automaton has 371 states and 373 transitions. Word has length 368 [2022-11-19 07:20:47,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:20:47,420 INFO L495 AbstractCegarLoop]: Abstraction has 371 states and 373 transitions. [2022-11-19 07:20:47,420 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 185 states, 185 states have (on average 3.32972972972973) internal successors, (616), 185 states have internal predecessors, (616), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:20:47,420 INFO L276 IsEmpty]: Start isEmpty. Operand 371 states and 373 transitions. [2022-11-19 07:20:47,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2022-11-19 07:20:47,421 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:20:47,421 INFO L195 NwaCegarLoop]: trace histogram [61, 61, 60, 60, 60, 60, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:20:47,427 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Ended with exit code 0 [2022-11-19 07:20:47,622 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90,89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:20:47,622 INFO L420 AbstractCegarLoop]: === Iteration 92 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:20:47,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:20:47,622 INFO L85 PathProgramCache]: Analyzing trace with hash 227246352, now seen corresponding path program 89 times [2022-11-19 07:20:47,622 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:20:47,623 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1104899313] [2022-11-19 07:20:47,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:20:47,623 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:20:47,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:20:55,303 INFO L134 CoverageAnalysis]: Checked inductivity of 10860 backedges. 7023 proven. 3837 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:20:55,303 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:20:55,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1104899313] [2022-11-19 07:20:55,304 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1104899313] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:20:55,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1790476377] [2022-11-19 07:20:55,304 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:20:55,304 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:20:55,304 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:20:55,305 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:20:55,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Waiting until timeout for monitored process [2022-11-19 07:20:55,790 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 61 check-sat command(s) [2022-11-19 07:20:55,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:20:55,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 1367 conjuncts, 124 conjunts are in the unsatisfiable core [2022-11-19 07:20:55,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:21:02,561 INFO L134 CoverageAnalysis]: Checked inductivity of 10860 backedges. 7200 proven. 3660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:21:02,562 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:21:07,662 INFO L134 CoverageAnalysis]: Checked inductivity of 10860 backedges. 7200 proven. 3660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:21:07,663 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1790476377] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:21:07,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2140161008] [2022-11-19 07:21:07,663 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:21:07,664 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:21:07,664 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:21:07,664 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:21:07,664 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:21:07,770 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:21:09,114 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '187196#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-19 07:21:09,114 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:21:09,114 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:21:09,114 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [124, 124, 124] total 187 [2022-11-19 07:21:09,114 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782631177] [2022-11-19 07:21:09,114 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:21:09,115 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 187 states [2022-11-19 07:21:09,115 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:21:09,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 187 interpolants. [2022-11-19 07:21:09,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7965, Invalid=30255, Unknown=0, NotChecked=0, Total=38220 [2022-11-19 07:21:09,118 INFO L87 Difference]: Start difference. First operand 371 states and 373 transitions. Second operand has 187 states, 187 states have (on average 3.304812834224599) internal successors, (618), 187 states have internal predecessors, (618), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:21:14,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:21:14,795 INFO L93 Difference]: Finished difference Result 803 states and 867 transitions. [2022-11-19 07:21:14,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2022-11-19 07:21:14,795 INFO L78 Accepts]: Start accepts. Automaton has has 187 states, 187 states have (on average 3.304812834224599) internal successors, (618), 187 states have internal predecessors, (618), 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 370 [2022-11-19 07:21:14,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:21:14,797 INFO L225 Difference]: With dead ends: 803 [2022-11-19 07:21:14,797 INFO L226 Difference]: Without dead ends: 556 [2022-11-19 07:21:14,801 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1293 GetRequests, 918 SyntacticMatches, 120 SemanticMatches, 255 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25066 ImplicationChecksByTransitivity, 18.7s TimeCoverageRelationStatistics Valid=15531, Invalid=50261, Unknown=0, NotChecked=0, Total=65792 [2022-11-19 07:21:14,801 INFO L413 NwaCegarLoop]: 124 mSDtfsCounter, 608 mSDsluCounter, 1492 mSDsCounter, 0 mSdLazyCounter, 1667 mSolverCounterSat, 525 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 608 SdHoareTripleChecker+Valid, 1616 SdHoareTripleChecker+Invalid, 2192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 525 IncrementalHoareTripleChecker+Valid, 1667 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:21:14,801 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [608 Valid, 1616 Invalid, 2192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [525 Valid, 1667 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-19 07:21:14,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 556 states. [2022-11-19 07:21:14,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 556 to 373. [2022-11-19 07:21:14,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 373 states, 372 states have (on average 1.0080645161290323) internal successors, (375), 372 states have internal predecessors, (375), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:21:14,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 373 states to 373 states and 375 transitions. [2022-11-19 07:21:14,873 INFO L78 Accepts]: Start accepts. Automaton has 373 states and 375 transitions. Word has length 370 [2022-11-19 07:21:14,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:21:14,873 INFO L495 AbstractCegarLoop]: Abstraction has 373 states and 375 transitions. [2022-11-19 07:21:14,874 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 187 states, 187 states have (on average 3.304812834224599) internal successors, (618), 187 states have internal predecessors, (618), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:21:14,874 INFO L276 IsEmpty]: Start isEmpty. Operand 373 states and 375 transitions. [2022-11-19 07:21:14,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 373 [2022-11-19 07:21:14,875 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:21:14,875 INFO L195 NwaCegarLoop]: trace histogram [62, 61, 61, 60, 60, 60, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:21:14,882 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Forceful destruction successful, exit code 0 [2022-11-19 07:21:15,075 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91,90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d95a582-a6c9-4741-9e00-9600daaf51f4/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:21:15,076 INFO L420 AbstractCegarLoop]: === Iteration 93 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:21:15,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:21:15,076 INFO L85 PathProgramCache]: Analyzing trace with hash 603695925, now seen corresponding path program 90 times [2022-11-19 07:21:15,076 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:21:15,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1799961213] [2022-11-19 07:21:15,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:21:15,077 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:21:15,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat