./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/half_2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 8393723b Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/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_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/half_2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/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_99592050-d460-4916-aed2-ddae267d048f/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 0b362a98d328467ff4a069dbed2be3429090ca070e60d49c76297e4bb94402b7 --- 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 07:28:31,631 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-19 07:28:31,634 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-19 07:28:31,666 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-19 07:28:31,669 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-19 07:28:31,674 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-19 07:28:31,679 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-19 07:28:31,686 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-19 07:28:31,689 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-19 07:28:31,698 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-19 07:28:31,700 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-19 07:28:31,702 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-19 07:28:31,703 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-19 07:28:31,706 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-19 07:28:31,708 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-19 07:28:31,710 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-19 07:28:31,713 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-19 07:28:31,714 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-19 07:28:31,716 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-19 07:28:31,721 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-19 07:28:31,726 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-19 07:28:31,728 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-19 07:28:31,729 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-19 07:28:31,730 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-19 07:28:31,734 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-19 07:28:31,735 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-19 07:28:31,735 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-19 07:28:31,736 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-19 07:28:31,737 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-19 07:28:31,738 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-19 07:28:31,739 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-19 07:28:31,740 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-19 07:28:31,741 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-19 07:28:31,742 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-19 07:28:31,743 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-19 07:28:31,743 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-19 07:28:31,744 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-19 07:28:31,745 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-19 07:28:31,745 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-19 07:28:31,746 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-19 07:28:31,746 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-19 07:28:31,747 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-19 07:28:31,778 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-19 07:28:31,778 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-19 07:28:31,779 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-19 07:28:31,779 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-19 07:28:31,780 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-19 07:28:31,783 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-19 07:28:31,783 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-19 07:28:31,783 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-19 07:28:31,784 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-19 07:28:31,784 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-19 07:28:31,784 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-19 07:28:31,785 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-19 07:28:31,785 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-19 07:28:31,785 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-19 07:28:31,785 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-19 07:28:31,786 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-19 07:28:31,786 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-19 07:28:31,786 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-19 07:28:31,787 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-19 07:28:31,790 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-19 07:28:31,790 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-19 07:28:31,791 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-19 07:28:31,791 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-19 07:28:31,791 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-19 07:28:31,792 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-19 07:28:31,792 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-19 07:28:31,793 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-19 07:28:31,793 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-19 07:28:31,794 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-19 07:28:31,794 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-19 07:28:31,795 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-19 07:28:31,795 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-19 07:28:31,795 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 07:28:31,796 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-19 07:28:31,796 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-19 07:28:31,796 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-19 07:28:31,798 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-19 07:28:31,798 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-19 07:28:31,798 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-19 07:28:31,798 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-19 07:28:31,799 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-19 07:28:31,799 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_99592050-d460-4916-aed2-ddae267d048f/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0b362a98d328467ff4a069dbed2be3429090ca070e60d49c76297e4bb94402b7 [2022-11-19 07:28:32,106 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-19 07:28:32,152 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-19 07:28:32,155 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-19 07:28:32,156 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-19 07:28:32,157 INFO L275 PluginConnector]: CDTParser initialized [2022-11-19 07:28:32,159 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/../../sv-benchmarks/c/loop-invgen/half_2.i [2022-11-19 07:28:32,255 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/data/20aeb0865/0db46254782848ac94cddece2bfdce2a/FLAG7507131bb [2022-11-19 07:28:32,793 INFO L306 CDTParser]: Found 1 translation units. [2022-11-19 07:28:32,794 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/sv-benchmarks/c/loop-invgen/half_2.i [2022-11-19 07:28:32,803 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/data/20aeb0865/0db46254782848ac94cddece2bfdce2a/FLAG7507131bb [2022-11-19 07:28:33,143 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/data/20aeb0865/0db46254782848ac94cddece2bfdce2a [2022-11-19 07:28:33,146 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-19 07:28:33,148 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-19 07:28:33,150 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-19 07:28:33,150 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-19 07:28:33,154 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-19 07:28:33,155 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 07:28:33" (1/1) ... [2022-11-19 07:28:33,156 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@45a8ccdb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:28:33, skipping insertion in model container [2022-11-19 07:28:33,157 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 07:28:33" (1/1) ... [2022-11-19 07:28:33,165 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-19 07:28:33,181 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-19 07:28:33,393 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_99592050-d460-4916-aed2-ddae267d048f/sv-benchmarks/c/loop-invgen/half_2.i[893,906] [2022-11-19 07:28:33,415 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 07:28:33,428 INFO L203 MainTranslator]: Completed pre-run [2022-11-19 07:28:33,445 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_99592050-d460-4916-aed2-ddae267d048f/sv-benchmarks/c/loop-invgen/half_2.i[893,906] [2022-11-19 07:28:33,450 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 07:28:33,464 INFO L208 MainTranslator]: Completed translation [2022-11-19 07:28:33,465 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:28:33 WrapperNode [2022-11-19 07:28:33,465 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-19 07:28:33,466 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-19 07:28:33,467 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-19 07:28:33,467 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-19 07:28:33,477 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:28:33" (1/1) ... [2022-11-19 07:28:33,487 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:28:33" (1/1) ... [2022-11-19 07:28:33,510 INFO L138 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 48 [2022-11-19 07:28:33,511 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-19 07:28:33,512 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-19 07:28:33,512 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-19 07:28:33,512 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-19 07:28:33,523 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:28:33" (1/1) ... [2022-11-19 07:28:33,524 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:28:33" (1/1) ... [2022-11-19 07:28:33,525 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:28:33" (1/1) ... [2022-11-19 07:28:33,525 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:28:33" (1/1) ... [2022-11-19 07:28:33,528 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:28:33" (1/1) ... [2022-11-19 07:28:33,533 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:28:33" (1/1) ... [2022-11-19 07:28:33,534 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:28:33" (1/1) ... [2022-11-19 07:28:33,535 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:28:33" (1/1) ... [2022-11-19 07:28:33,537 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-19 07:28:33,539 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-19 07:28:33,539 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-19 07:28:33,539 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-19 07:28:33,540 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:28:33" (1/1) ... [2022-11-19 07:28:33,549 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 07:28:33,563 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:28:33,582 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-19 07:28:33,585 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-19 07:28:33,628 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-19 07:28:33,629 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-19 07:28:33,629 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-19 07:28:33,630 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-19 07:28:33,701 INFO L235 CfgBuilder]: Building ICFG [2022-11-19 07:28:33,704 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-19 07:28:33,843 INFO L276 CfgBuilder]: Performing block encoding [2022-11-19 07:28:33,870 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-19 07:28:33,870 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-19 07:28:33,873 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 07:28:33 BoogieIcfgContainer [2022-11-19 07:28:33,873 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-19 07:28:33,876 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-19 07:28:33,876 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-19 07:28:33,883 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-19 07:28:33,884 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 07:28:33" (1/3) ... [2022-11-19 07:28:33,884 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4eff36ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 07:28:33, skipping insertion in model container [2022-11-19 07:28:33,885 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:28:33" (2/3) ... [2022-11-19 07:28:33,885 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4eff36ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 07:28:33, skipping insertion in model container [2022-11-19 07:28:33,885 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 07:28:33" (3/3) ... [2022-11-19 07:28:33,887 INFO L112 eAbstractionObserver]: Analyzing ICFG half_2.i [2022-11-19 07:28:33,908 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-19 07:28:33,909 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-19 07:28:33,984 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-19 07:28:33,994 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;@72150374, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-19 07:28:33,994 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-19 07:28:33,999 INFO L276 IsEmpty]: Start isEmpty. Operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:28:34,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-19 07:28:34,007 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:28:34,008 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-19 07:28:34,009 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:28:34,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:28:34,016 INFO L85 PathProgramCache]: Analyzing trace with hash -2025251484, now seen corresponding path program 1 times [2022-11-19 07:28:34,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:28:34,027 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [152733461] [2022-11-19 07:28:34,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:28:34,028 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:28:34,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:28:34,554 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 07:28:34,555 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:28:34,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [152733461] [2022-11-19 07:28:34,557 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [152733461] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:28:34,557 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:28:34,557 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-19 07:28:34,559 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640931002] [2022-11-19 07:28:34,561 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:28:34,566 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 07:28:34,566 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:28:34,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 07:28:34,671 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-19 07:28:34,674 INFO L87 Difference]: Start difference. First operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 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 5 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:28:34,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:28:34,808 INFO L93 Difference]: Finished difference Result 26 states and 32 transitions. [2022-11-19 07:28:34,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-19 07:28:34,812 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-19 07:28:34,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:28:34,822 INFO L225 Difference]: With dead ends: 26 [2022-11-19 07:28:34,823 INFO L226 Difference]: Without dead ends: 13 [2022-11-19 07:28:34,835 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2022-11-19 07:28:34,845 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 14 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:28:34,847 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 11 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:28:34,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-11-19 07:28:34,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 11. [2022-11-19 07:28:34,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:28:34,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 13 transitions. [2022-11-19 07:28:34,895 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 13 transitions. Word has length 6 [2022-11-19 07:28:34,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:28:34,895 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 13 transitions. [2022-11-19 07:28:34,897 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:28:34,898 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 13 transitions. [2022-11-19 07:28:34,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-19 07:28:34,899 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:28:34,899 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:28:34,900 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-19 07:28:34,901 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:28:34,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:28:34,903 INFO L85 PathProgramCache]: Analyzing trace with hash 1610042692, now seen corresponding path program 1 times [2022-11-19 07:28:34,903 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:28:34,904 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1803129691] [2022-11-19 07:28:34,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:28:34,904 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:28:34,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:28:35,246 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:35,247 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:28:35,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1803129691] [2022-11-19 07:28:35,247 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1803129691] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:28:35,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1189276981] [2022-11-19 07:28:35,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:28:35,248 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:28:35,249 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:28:35,259 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:28:35,276 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-19 07:28:35,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:28:35,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-19 07:28:35,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:28:35,639 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:35,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:28:35,993 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:35,994 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1189276981] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:28:35,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [578864057] [2022-11-19 07:28:36,018 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-19 07:28:36,018 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:28:36,023 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:28:36,029 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:28:36,030 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:28:36,235 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:28:36,634 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '123#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (= |ULTIMATE.start_main_~j~0#1| 0) (not (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:28:36,635 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:28:36,636 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:28:36,637 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2022-11-19 07:28:36,639 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136166513] [2022-11-19 07:28:36,640 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:28:36,641 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-19 07:28:36,641 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:28:36,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-19 07:28:36,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2022-11-19 07:28:36,646 INFO L87 Difference]: Start difference. First operand 11 states and 13 transitions. Second operand has 12 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:28:37,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:28:37,299 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2022-11-19 07:28:37,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-19 07:28:37,303 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-19 07:28:37,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:28:37,304 INFO L225 Difference]: With dead ends: 36 [2022-11-19 07:28:37,305 INFO L226 Difference]: Without dead ends: 34 [2022-11-19 07:28:37,306 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=159, Invalid=653, Unknown=0, NotChecked=0, Total=812 [2022-11-19 07:28:37,307 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 55 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:28:37,308 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 26 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:28:37,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-11-19 07:28:37,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 16. [2022-11-19 07:28:37,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:28:37,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2022-11-19 07:28:37,323 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 7 [2022-11-19 07:28:37,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:28:37,324 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2022-11-19 07:28:37,325 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:28:37,325 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2022-11-19 07:28:37,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-19 07:28:37,326 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:28:37,326 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1] [2022-11-19 07:28:37,341 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-19 07:28:37,533 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:28:37,534 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:28:37,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:28:37,535 INFO L85 PathProgramCache]: Analyzing trace with hash 49336644, now seen corresponding path program 2 times [2022-11-19 07:28:37,535 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:28:37,535 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [397851842] [2022-11-19 07:28:37,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:28:37,536 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:28:37,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:28:37,755 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:37,756 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:28:37,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [397851842] [2022-11-19 07:28:37,761 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [397851842] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:28:37,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [876730094] [2022-11-19 07:28:37,762 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:28:37,762 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:28:37,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:28:37,768 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:28:37,791 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-19 07:28:37,836 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-19 07:28:37,836 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:28:37,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-19 07:28:37,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:28:37,979 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:37,980 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:28:38,104 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:38,104 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [876730094] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:28:38,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [170013968] [2022-11-19 07:28:38,111 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-19 07:28:38,112 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:28:38,112 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:28:38,113 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:28:38,113 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:28:38,244 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:28:38,581 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '295#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (= |ULTIMATE.start_main_~j~0#1| 0) (not (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:28:38,581 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:28:38,581 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:28:38,581 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 15 [2022-11-19 07:28:38,582 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564946454] [2022-11-19 07:28:38,582 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:28:38,582 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-19 07:28:38,582 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:28:38,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-19 07:28:38,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=304, Unknown=0, NotChecked=0, Total=380 [2022-11-19 07:28:38,584 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 15 states, 15 states have (on average 1.4) internal successors, (21), 15 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:28:39,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:28:39,120 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2022-11-19 07:28:39,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-19 07:28:39,121 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.4) internal successors, (21), 15 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-19 07:28:39,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:28:39,121 INFO L225 Difference]: With dead ends: 46 [2022-11-19 07:28:39,122 INFO L226 Difference]: Without dead ends: 44 [2022-11-19 07:28:39,122 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=237, Invalid=885, Unknown=0, NotChecked=0, Total=1122 [2022-11-19 07:28:39,123 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 53 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:28:39,124 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 54 Invalid, 197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:28:39,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-19 07:28:39,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 16. [2022-11-19 07:28:39,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:28:39,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2022-11-19 07:28:39,141 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 9 [2022-11-19 07:28:39,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:28:39,145 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2022-11-19 07:28:39,146 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.4) internal successors, (21), 15 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:28:39,146 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2022-11-19 07:28:39,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-19 07:28:39,148 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:28:39,148 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:28:39,160 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-19 07:28:39,354 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:28:39,355 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:28:39,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:28:39,355 INFO L85 PathProgramCache]: Analyzing trace with hash 1438439610, now seen corresponding path program 1 times [2022-11-19 07:28:39,355 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:28:39,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [717564337] [2022-11-19 07:28:39,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:28:39,356 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:28:39,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:28:39,503 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:39,504 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:28:39,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [717564337] [2022-11-19 07:28:39,504 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [717564337] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:28:39,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1499300411] [2022-11-19 07:28:39,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:28:39,505 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:28:39,505 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:28:39,507 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:28:39,508 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-19 07:28:39,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:28:39,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-19 07:28:39,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:28:39,592 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 07:28:39,607 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 07:28:39,607 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1499300411] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:28:39,607 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 07:28:39,608 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2022-11-19 07:28:39,608 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631372434] [2022-11-19 07:28:39,608 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:28:39,608 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 07:28:39,609 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:28:39,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 07:28:39,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2022-11-19 07:28:39,610 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:28:39,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:28:39,670 INFO L93 Difference]: Finished difference Result 23 states and 27 transitions. [2022-11-19 07:28:39,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-19 07:28:39,670 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-19 07:28:39,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:28:39,671 INFO L225 Difference]: With dead ends: 23 [2022-11-19 07:28:39,671 INFO L226 Difference]: Without dead ends: 16 [2022-11-19 07:28:39,672 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2022-11-19 07:28:39,687 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 4 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:28:39,688 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 13 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 07:28:39,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-11-19 07:28:39,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-11-19 07:28:39,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 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 07:28:39,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2022-11-19 07:28:39,697 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 9 [2022-11-19 07:28:39,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:28:39,697 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2022-11-19 07:28:39,698 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:28:39,698 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2022-11-19 07:28:39,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-19 07:28:39,698 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:28:39,698 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:28:39,723 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-11-19 07:28:39,904 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:28:39,904 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:28:39,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:28:39,905 INFO L85 PathProgramCache]: Analyzing trace with hash 543513786, now seen corresponding path program 1 times [2022-11-19 07:28:39,905 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:28:39,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [959180643] [2022-11-19 07:28:39,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:28:39,906 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:28:39,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:28:40,184 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:40,184 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:28:40,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [959180643] [2022-11-19 07:28:40,185 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [959180643] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:28:40,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [635617008] [2022-11-19 07:28:40,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:28:40,185 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:28:40,185 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:28:40,186 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:28:40,201 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-19 07:28:40,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:28:40,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-19 07:28:40,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:28:40,415 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:40,416 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:28:40,743 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:40,743 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [635617008] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:28:40,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [225955250] [2022-11-19 07:28:40,748 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:28:40,748 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:28:40,748 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:28:40,748 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:28:40,749 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:28:40,957 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:28:41,499 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '598#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:28:41,499 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:28:41,499 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:28:41,499 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 18 [2022-11-19 07:28:41,499 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131052557] [2022-11-19 07:28:41,500 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:28:41,500 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-19 07:28:41,500 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:28:41,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-19 07:28:41,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=465, Unknown=0, NotChecked=0, Total=552 [2022-11-19 07:28:41,501 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 18 states, 18 states have (on average 1.5) internal successors, (27), 18 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 07:28:42,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:28:42,406 INFO L93 Difference]: Finished difference Result 42 states and 48 transitions. [2022-11-19 07:28:42,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-19 07:28:42,406 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.5) internal successors, (27), 18 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) Word has length 11 [2022-11-19 07:28:42,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:28:42,407 INFO L225 Difference]: With dead ends: 42 [2022-11-19 07:28:42,407 INFO L226 Difference]: Without dead ends: 25 [2022-11-19 07:28:42,408 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=249, Invalid=1233, Unknown=0, NotChecked=0, Total=1482 [2022-11-19 07:28:42,410 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 62 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:28:42,410 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 25 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 154 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:28:42,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-11-19 07:28:42,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 16. [2022-11-19 07:28:42,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 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 07:28:42,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2022-11-19 07:28:42,421 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2022-11-19 07:28:42,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:28:42,422 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2022-11-19 07:28:42,422 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.5) internal successors, (27), 18 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 07:28:42,422 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2022-11-19 07:28:42,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-19 07:28:42,423 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:28:42,423 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1] [2022-11-19 07:28:42,436 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-19 07:28:42,629 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:28:42,629 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:28:42,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:28:42,630 INFO L85 PathProgramCache]: Analyzing trace with hash -1965317756, now seen corresponding path program 2 times [2022-11-19 07:28:42,630 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:28:42,630 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1903092751] [2022-11-19 07:28:42,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:28:42,630 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:28:42,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:28:43,024 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:43,024 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:28:43,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1903092751] [2022-11-19 07:28:43,025 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1903092751] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:28:43,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [575870747] [2022-11-19 07:28:43,025 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:28:43,025 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:28:43,025 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:28:43,027 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:28:43,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-19 07:28:43,080 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-19 07:28:43,080 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:28:43,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-19 07:28:43,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:28:43,349 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:43,349 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:28:43,815 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:43,815 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [575870747] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:28:43,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1601924413] [2022-11-19 07:28:43,818 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:28:43,818 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:28:43,818 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:28:43,819 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:28:43,819 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:28:43,974 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:28:44,504 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '837#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:28:44,504 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:28:44,505 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:28:44,505 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 26 [2022-11-19 07:28:44,505 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1612264164] [2022-11-19 07:28:44,505 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:28:44,508 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-19 07:28:44,508 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:28:44,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-19 07:28:44,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=861, Unknown=0, NotChecked=0, Total=992 [2022-11-19 07:28:44,517 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:28:45,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:28:45,036 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2022-11-19 07:28:45,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-19 07:28:45,040 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-11-19 07:28:45,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:28:45,041 INFO L225 Difference]: With dead ends: 32 [2022-11-19 07:28:45,041 INFO L226 Difference]: Without dead ends: 18 [2022-11-19 07:28:45,042 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 358 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=209, Invalid=1351, Unknown=0, NotChecked=0, Total=1560 [2022-11-19 07:28:45,043 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 28 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 202 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:28:45,043 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 37 Invalid, 225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 202 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:28:45,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-11-19 07:28:45,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2022-11-19 07:28:45,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:28:45,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2022-11-19 07:28:45,059 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 15 [2022-11-19 07:28:45,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:28:45,059 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2022-11-19 07:28:45,059 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:28:45,060 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2022-11-19 07:28:45,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-19 07:28:45,060 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:28:45,060 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1] [2022-11-19 07:28:45,076 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-19 07:28:45,267 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:28:45,267 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:28:45,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:28:45,268 INFO L85 PathProgramCache]: Analyzing trace with hash -772452956, now seen corresponding path program 3 times [2022-11-19 07:28:45,268 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:28:45,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [604534625] [2022-11-19 07:28:45,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:28:45,269 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:28:45,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:28:45,440 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:45,440 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:28:45,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [604534625] [2022-11-19 07:28:45,440 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [604534625] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:28:45,441 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1263291588] [2022-11-19 07:28:45,441 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:28:45,441 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:28:45,441 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:28:45,442 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:28:45,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-19 07:28:45,503 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:28:45,503 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:28:45,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-19 07:28:45,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:28:45,623 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:45,623 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:28:45,760 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:45,761 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1263291588] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:28:45,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1915668848] [2022-11-19 07:28:45,763 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:28:45,763 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:28:45,763 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:28:45,763 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:28:45,764 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:28:45,915 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:28:46,381 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1046#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:28:46,381 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:28:46,382 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:28:46,382 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2022-11-19 07:28:46,382 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449935141] [2022-11-19 07:28:46,382 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:28:46,383 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-19 07:28:46,383 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:28:46,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-19 07:28:46,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=507, Unknown=0, NotChecked=0, Total=600 [2022-11-19 07:28:46,384 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:28:46,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:28:46,638 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2022-11-19 07:28:46,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-19 07:28:46,639 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-11-19 07:28:46,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:28:46,640 INFO L225 Difference]: With dead ends: 28 [2022-11-19 07:28:46,640 INFO L226 Difference]: Without dead ends: 26 [2022-11-19 07:28:46,641 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 30 SyntacticMatches, 3 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=179, Invalid=877, Unknown=0, NotChecked=0, Total=1056 [2022-11-19 07:28:46,642 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 48 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:28:46,642 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 24 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:28:46,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-19 07:28:46,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 20. [2022-11-19 07:28:46,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 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 07:28:46,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2022-11-19 07:28:46,659 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 16 [2022-11-19 07:28:46,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:28:46,659 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2022-11-19 07:28:46,660 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:28:46,660 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2022-11-19 07:28:46,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-19 07:28:46,661 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:28:46,661 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1] [2022-11-19 07:28:46,677 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-19 07:28:46,867 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:28:46,867 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:28:46,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:28:46,868 INFO L85 PathProgramCache]: Analyzing trace with hash 293585018, now seen corresponding path program 4 times [2022-11-19 07:28:46,868 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:28:46,868 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1633787609] [2022-11-19 07:28:46,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:28:46,868 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:28:46,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:28:47,408 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:47,409 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:28:47,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1633787609] [2022-11-19 07:28:47,409 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1633787609] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:28:47,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1771192701] [2022-11-19 07:28:47,410 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:28:47,410 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:28:47,410 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:28:47,411 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:28:47,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-19 07:28:47,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:28:47,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-19 07:28:47,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:28:47,766 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:47,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:28:48,383 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:48,384 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1771192701] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:28:48,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1026177306] [2022-11-19 07:28:48,386 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:28:48,387 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:28:48,387 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:28:48,387 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:28:48,388 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:28:48,514 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:28:48,982 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1279#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:28:48,983 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:28:48,983 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:28:48,983 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 28 [2022-11-19 07:28:48,983 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1683265142] [2022-11-19 07:28:48,984 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:28:48,984 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-19 07:28:48,984 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:28:48,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-19 07:28:48,986 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=968, Unknown=0, NotChecked=0, Total=1122 [2022-11-19 07:28:48,986 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 28 states, 28 states have (on average 1.75) internal successors, (49), 28 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 07:28:50,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:28:50,453 INFO L93 Difference]: Finished difference Result 55 states and 63 transitions. [2022-11-19 07:28:50,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-19 07:28:50,453 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.75) internal successors, (49), 28 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) Word has length 19 [2022-11-19 07:28:50,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:28:50,456 INFO L225 Difference]: With dead ends: 55 [2022-11-19 07:28:50,456 INFO L226 Difference]: Without dead ends: 38 [2022-11-19 07:28:50,457 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 674 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=401, Invalid=2461, Unknown=0, NotChecked=0, Total=2862 [2022-11-19 07:28:50,459 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 73 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 356 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:28:50,459 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 46 Invalid, 356 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 307 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:28:50,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-11-19 07:28:50,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 28. [2022-11-19 07:28:50,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.2222222222222223) internal successors, (33), 27 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:28:50,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2022-11-19 07:28:50,480 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 19 [2022-11-19 07:28:50,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:28:50,480 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2022-11-19 07:28:50,480 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.75) internal successors, (49), 28 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 07:28:50,481 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2022-11-19 07:28:50,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-19 07:28:50,481 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:28:50,482 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1] [2022-11-19 07:28:50,491 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-11-19 07:28:50,688 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-19 07:28:50,688 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:28:50,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:28:50,689 INFO L85 PathProgramCache]: Analyzing trace with hash -486816316, now seen corresponding path program 5 times [2022-11-19 07:28:50,689 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:28:50,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575714500] [2022-11-19 07:28:50,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:28:50,689 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:28:50,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:28:51,279 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 12 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:51,279 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:28:51,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575714500] [2022-11-19 07:28:51,280 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [575714500] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:28:51,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1073063465] [2022-11-19 07:28:51,280 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:28:51,280 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:28:51,281 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:28:51,284 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:28:51,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-19 07:28:51,361 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-19 07:28:51,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:28:51,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-19 07:28:51,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:28:51,990 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:51,990 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:28:53,033 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:53,034 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1073063465] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:28:53,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1466680888] [2022-11-19 07:28:53,037 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:28:53,038 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:28:53,039 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:28:53,039 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:28:53,039 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:28:53,198 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:28:53,877 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1637#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:28:53,877 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:28:53,877 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:28:53,877 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 16] total 42 [2022-11-19 07:28:53,877 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572977416] [2022-11-19 07:28:53,877 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:28:53,878 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-11-19 07:28:53,878 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:28:53,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-11-19 07:28:53,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=270, Invalid=1986, Unknown=0, NotChecked=0, Total=2256 [2022-11-19 07:28:53,880 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand has 42 states, 42 states have (on average 1.5238095238095237) internal successors, (64), 42 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:28:55,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:28:55,092 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2022-11-19 07:28:55,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-19 07:28:55,093 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.5238095238095237) internal successors, (64), 42 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2022-11-19 07:28:55,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:28:55,094 INFO L225 Difference]: With dead ends: 51 [2022-11-19 07:28:55,094 INFO L226 Difference]: Without dead ends: 31 [2022-11-19 07:28:55,096 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 975 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=473, Invalid=3309, Unknown=0, NotChecked=0, Total=3782 [2022-11-19 07:28:55,096 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 48 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 362 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 409 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 362 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:28:55,097 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 40 Invalid, 409 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 362 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:28:55,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-19 07:28:55,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2022-11-19 07:28:55,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 27 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:28:55,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2022-11-19 07:28:55,121 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 23 [2022-11-19 07:28:55,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:28:55,121 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2022-11-19 07:28:55,121 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.5238095238095237) internal successors, (64), 42 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:28:55,122 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2022-11-19 07:28:55,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-19 07:28:55,122 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:28:55,123 INFO L195 NwaCegarLoop]: trace histogram [9, 4, 3, 3, 1, 1, 1, 1, 1] [2022-11-19 07:28:55,135 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-11-19 07:28:55,329 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-19 07:28:55,330 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:28:55,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:28:55,330 INFO L85 PathProgramCache]: Analyzing trace with hash -711895910, now seen corresponding path program 6 times [2022-11-19 07:28:55,331 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:28:55,331 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [239934220] [2022-11-19 07:28:55,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:28:55,331 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:28:55,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:28:55,694 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 28 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:55,695 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:28:55,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [239934220] [2022-11-19 07:28:55,695 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [239934220] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:28:55,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1246035779] [2022-11-19 07:28:55,695 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:28:55,696 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:28:55,696 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:28:55,697 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:28:55,723 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-19 07:28:55,770 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:28:55,771 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:28:55,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-19 07:28:55,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:28:56,114 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:56,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:28:56,474 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:56,474 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1246035779] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:28:56,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1404648781] [2022-11-19 07:28:56,477 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:28:56,477 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:28:56,477 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:28:56,478 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:28:56,478 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:28:56,631 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:28:57,220 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1979#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:28:57,220 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:28:57,220 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:28:57,220 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 39 [2022-11-19 07:28:57,220 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375786254] [2022-11-19 07:28:57,221 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:28:57,221 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-19 07:28:57,221 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:28:57,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-19 07:28:57,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=345, Invalid=1635, Unknown=0, NotChecked=0, Total=1980 [2022-11-19 07:28:57,223 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 39 states, 39 states have (on average 1.4615384615384615) internal successors, (57), 39 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 07:28:58,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:28:58,462 INFO L93 Difference]: Finished difference Result 97 states and 108 transitions. [2022-11-19 07:28:58,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-19 07:28:58,463 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.4615384615384615) internal successors, (57), 39 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 24 [2022-11-19 07:28:58,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:28:58,464 INFO L225 Difference]: With dead ends: 97 [2022-11-19 07:28:58,464 INFO L226 Difference]: Without dead ends: 95 [2022-11-19 07:28:58,467 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1633 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1185, Invalid=4365, Unknown=0, NotChecked=0, Total=5550 [2022-11-19 07:28:58,468 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 164 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 164 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 544 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:28:58,468 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [164 Valid, 54 Invalid, 544 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 462 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:28:58,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-11-19 07:28:58,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 40. [2022-11-19 07:28:58,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 39 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:28:58,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2022-11-19 07:28:58,508 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 24 [2022-11-19 07:28:58,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:28:58,509 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2022-11-19 07:28:58,509 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.4615384615384615) internal successors, (57), 39 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 07:28:58,509 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2022-11-19 07:28:58,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-19 07:28:58,510 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:28:58,510 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1] [2022-11-19 07:28:58,516 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-19 07:28:58,711 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:28:58,711 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:28:58,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:28:58,712 INFO L85 PathProgramCache]: Analyzing trace with hash 569136186, now seen corresponding path program 7 times [2022-11-19 07:28:58,712 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:28:58,712 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2145807562] [2022-11-19 07:28:58,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:28:58,712 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:28:58,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:28:59,564 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 22 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:28:59,565 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:28:59,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2145807562] [2022-11-19 07:28:59,565 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2145807562] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:28:59,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [191339578] [2022-11-19 07:28:59,566 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:28:59,566 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:28:59,566 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:28:59,571 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:28:59,578 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-19 07:28:59,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:28:59,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-19 07:28:59,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:29:00,079 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:29:00,080 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:29:01,145 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:29:01,145 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [191339578] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:29:01,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [160307300] [2022-11-19 07:29:01,147 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:29:01,148 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:29:01,148 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:29:01,148 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:29:01,149 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:29:01,272 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:29:01,833 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2464#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:29:01,834 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:29:01,834 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:29:01,834 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 38 [2022-11-19 07:29:01,834 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017225465] [2022-11-19 07:29:01,835 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:29:01,835 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-19 07:29:01,835 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:29:01,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-19 07:29:01,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=1643, Unknown=0, NotChecked=0, Total=1892 [2022-11-19 07:29:01,837 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand has 38 states, 38 states have (on average 1.868421052631579) internal successors, (71), 38 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 07:29:04,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:29:04,217 INFO L93 Difference]: Finished difference Result 124 states and 133 transitions. [2022-11-19 07:29:04,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-19 07:29:04,217 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.868421052631579) internal successors, (71), 38 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) Word has length 27 [2022-11-19 07:29:04,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:29:04,218 INFO L225 Difference]: With dead ends: 124 [2022-11-19 07:29:04,219 INFO L226 Difference]: Without dead ends: 101 [2022-11-19 07:29:04,220 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1265 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=686, Invalid=4426, Unknown=0, NotChecked=0, Total=5112 [2022-11-19 07:29:04,221 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 107 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 508 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 585 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-19 07:29:04,222 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [107 Valid, 67 Invalid, 585 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 508 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-19 07:29:04,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-11-19 07:29:04,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 40. [2022-11-19 07:29:04,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 39 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:29:04,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2022-11-19 07:29:04,262 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 27 [2022-11-19 07:29:04,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:29:04,263 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2022-11-19 07:29:04,263 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.868421052631579) internal successors, (71), 38 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 07:29:04,263 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2022-11-19 07:29:04,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-19 07:29:04,264 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:29:04,264 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1] [2022-11-19 07:29:04,271 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-19 07:29:04,470 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-19 07:29:04,470 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:29:04,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:29:04,471 INFO L85 PathProgramCache]: Analyzing trace with hash 1681635844, now seen corresponding path program 8 times [2022-11-19 07:29:04,471 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:29:04,471 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [424474188] [2022-11-19 07:29:04,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:29:04,471 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:29:04,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:29:05,342 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 35 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:29:05,342 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:29:05,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [424474188] [2022-11-19 07:29:05,343 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [424474188] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:29:05,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2128753395] [2022-11-19 07:29:05,343 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:29:05,343 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:29:05,343 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:29:05,347 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:29:05,371 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-19 07:29:05,427 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-19 07:29:05,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:29:05,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-19 07:29:05,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:29:06,307 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:29:06,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:29:07,698 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:29:07,699 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2128753395] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:29:07,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [379479043] [2022-11-19 07:29:07,702 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:29:07,702 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:29:07,702 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:29:07,703 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:29:07,703 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:29:07,820 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:29:08,466 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3035#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:29:08,466 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:29:08,466 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:29:08,466 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 20, 20] total 54 [2022-11-19 07:29:08,466 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795091156] [2022-11-19 07:29:08,467 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:29:08,467 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-19 07:29:08,467 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:29:08,468 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-19 07:29:08,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=3136, Unknown=0, NotChecked=0, Total=3540 [2022-11-19 07:29:08,469 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 54 states, 54 states have (on average 1.6296296296296295) internal successors, (88), 54 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:29:10,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:29:10,433 INFO L93 Difference]: Finished difference Result 69 states and 73 transitions. [2022-11-19 07:29:10,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-19 07:29:10,434 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.6296296296296295) internal successors, (88), 54 states have internal predecessors, (88), 0 states have call successors, (0), 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 31 [2022-11-19 07:29:10,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:29:10,434 INFO L225 Difference]: With dead ends: 69 [2022-11-19 07:29:10,435 INFO L226 Difference]: Without dead ends: 43 [2022-11-19 07:29:10,438 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1569 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=715, Invalid=5291, Unknown=0, NotChecked=0, Total=6006 [2022-11-19 07:29:10,439 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 79 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 631 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 715 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 631 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-19 07:29:10,439 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 60 Invalid, 715 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 631 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-19 07:29:10,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-11-19 07:29:10,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2022-11-19 07:29:10,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 39 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:29:10,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2022-11-19 07:29:10,465 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 31 [2022-11-19 07:29:10,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:29:10,465 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2022-11-19 07:29:10,466 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 1.6296296296296295) internal successors, (88), 54 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:29:10,466 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2022-11-19 07:29:10,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-19 07:29:10,467 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:29:10,467 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1, 1] [2022-11-19 07:29:10,473 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-19 07:29:10,671 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:29:10,671 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:29:10,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:29:10,671 INFO L85 PathProgramCache]: Analyzing trace with hash 994514938, now seen corresponding path program 9 times [2022-11-19 07:29:10,672 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:29:10,672 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1539871412] [2022-11-19 07:29:10,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:29:10,672 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:29:10,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:29:11,685 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 51 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:29:11,685 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:29:11,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1539871412] [2022-11-19 07:29:11,685 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1539871412] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:29:11,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2071689743] [2022-11-19 07:29:11,685 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:29:11,686 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:29:11,687 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:29:11,688 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:29:11,699 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-19 07:29:11,754 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:29:11,754 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:29:11,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-19 07:29:11,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:29:12,261 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:29:12,261 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:29:13,506 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:29:13,506 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2071689743] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:29:13,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1574563861] [2022-11-19 07:29:13,508 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:29:13,508 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:29:13,509 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:29:13,509 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:29:13,509 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:29:13,631 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:29:14,354 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3510#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:29:14,355 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:29:14,355 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:29:14,355 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 48 [2022-11-19 07:29:14,356 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [746127384] [2022-11-19 07:29:14,356 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:29:14,356 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-19 07:29:14,356 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:29:14,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-19 07:29:14,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=372, Invalid=2490, Unknown=0, NotChecked=0, Total=2862 [2022-11-19 07:29:14,359 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 48 states, 48 states have (on average 1.9375) internal successors, (93), 48 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 07:29:17,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:29:17,796 INFO L93 Difference]: Finished difference Result 102 states and 113 transitions. [2022-11-19 07:29:17,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-11-19 07:29:17,797 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.9375) internal successors, (93), 48 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 35 [2022-11-19 07:29:17,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:29:17,797 INFO L225 Difference]: With dead ends: 102 [2022-11-19 07:29:17,797 INFO L226 Difference]: Without dead ends: 73 [2022-11-19 07:29:17,800 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2033 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=1055, Invalid=6955, Unknown=0, NotChecked=0, Total=8010 [2022-11-19 07:29:17,801 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 147 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 819 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 945 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 819 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 07:29:17,801 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [147 Valid, 98 Invalid, 945 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 819 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-19 07:29:17,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-11-19 07:29:17,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 40. [2022-11-19 07:29:17,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 39 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:29:17,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2022-11-19 07:29:17,835 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 35 [2022-11-19 07:29:17,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:29:17,835 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2022-11-19 07:29:17,836 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.9375) internal successors, (93), 48 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 07:29:17,836 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2022-11-19 07:29:17,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-19 07:29:17,837 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:29:17,837 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1, 1] [2022-11-19 07:29:17,849 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-19 07:29:18,043 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-19 07:29:18,044 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:29:18,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:29:18,044 INFO L85 PathProgramCache]: Analyzing trace with hash -1887470012, now seen corresponding path program 10 times [2022-11-19 07:29:18,045 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:29:18,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [503981154] [2022-11-19 07:29:18,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:29:18,045 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:29:18,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:29:19,238 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 70 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:29:19,238 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:29:19,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [503981154] [2022-11-19 07:29:19,238 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [503981154] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:29:19,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [748363540] [2022-11-19 07:29:19,239 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:29:19,239 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:29:19,239 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:29:19,240 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:29:19,243 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-19 07:29:19,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:29:19,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 44 conjunts are in the unsatisfiable core [2022-11-19 07:29:19,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:29:20,029 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:29:20,029 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:29:21,557 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:29:21,558 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [748363540] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:29:21,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [92737968] [2022-11-19 07:29:21,559 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:29:21,560 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:29:21,560 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:29:21,560 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:29:21,560 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:29:21,666 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:29:22,376 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4108#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:29:22,376 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:29:22,376 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:29:22,376 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 53 [2022-11-19 07:29:22,377 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366975973] [2022-11-19 07:29:22,377 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:29:22,377 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-11-19 07:29:22,377 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:29:22,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-11-19 07:29:22,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=444, Invalid=2978, Unknown=0, NotChecked=0, Total=3422 [2022-11-19 07:29:22,380 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand has 53 states, 53 states have (on average 1.9622641509433962) internal successors, (104), 53 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:29:26,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:29:26,011 INFO L93 Difference]: Finished difference Result 110 states and 123 transitions. [2022-11-19 07:29:26,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-11-19 07:29:26,012 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.9622641509433962) internal successors, (104), 53 states have internal predecessors, (104), 0 states have call successors, (0), 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 39 [2022-11-19 07:29:26,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:29:26,012 INFO L225 Difference]: With dead ends: 110 [2022-11-19 07:29:26,013 INFO L226 Difference]: Without dead ends: 78 [2022-11-19 07:29:26,015 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2483 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=1271, Invalid=8431, Unknown=0, NotChecked=0, Total=9702 [2022-11-19 07:29:26,016 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 166 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 982 mSolverCounterSat, 150 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 1132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 150 IncrementalHoareTripleChecker+Valid, 982 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 07:29:26,016 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [166 Valid, 119 Invalid, 1132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [150 Valid, 982 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-19 07:29:26,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-11-19 07:29:26,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 53. [2022-11-19 07:29:26,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.2115384615384615) internal successors, (63), 52 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 07:29:26,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 63 transitions. [2022-11-19 07:29:26,062 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 63 transitions. Word has length 39 [2022-11-19 07:29:26,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:29:26,062 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 63 transitions. [2022-11-19 07:29:26,063 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.9622641509433962) internal successors, (104), 53 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:29:26,063 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 63 transitions. [2022-11-19 07:29:26,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-19 07:29:26,064 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:29:26,064 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1, 1] [2022-11-19 07:29:26,069 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-19 07:29:26,267 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-19 07:29:26,267 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:29:26,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:29:26,268 INFO L85 PathProgramCache]: Analyzing trace with hash -1574171718, now seen corresponding path program 11 times [2022-11-19 07:29:26,268 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:29:26,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [448179102] [2022-11-19 07:29:26,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:29:26,268 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:29:26,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:29:27,578 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 92 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:29:27,579 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:29:27,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [448179102] [2022-11-19 07:29:27,579 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [448179102] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:29:27,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [63667191] [2022-11-19 07:29:27,579 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:29:27,579 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:29:27,579 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:29:27,583 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:29:27,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-19 07:29:27,678 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-11-19 07:29:27,678 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:29:27,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 44 conjunts are in the unsatisfiable core [2022-11-19 07:29:27,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:29:28,916 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:29:28,916 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:29:30,818 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:29:30,819 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [63667191] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:29:30,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1537705427] [2022-11-19 07:29:30,820 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:29:30,821 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:29:30,821 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:29:30,821 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:29:30,821 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:29:30,920 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:29:31,669 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4796#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:29:31,669 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:29:31,669 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:29:31,670 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26, 26] total 72 [2022-11-19 07:29:31,670 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092150687] [2022-11-19 07:29:31,670 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:29:31,670 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2022-11-19 07:29:31,670 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:29:31,671 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2022-11-19 07:29:31,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=665, Invalid=5341, Unknown=0, NotChecked=0, Total=6006 [2022-11-19 07:29:31,673 INFO L87 Difference]: Start difference. First operand 53 states and 63 transitions. Second operand has 72 states, 72 states have (on average 1.7222222222222223) internal successors, (124), 72 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:29:35,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:29:35,003 INFO L93 Difference]: Finished difference Result 91 states and 102 transitions. [2022-11-19 07:29:35,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-19 07:29:35,003 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 1.7222222222222223) internal successors, (124), 72 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2022-11-19 07:29:35,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:29:35,004 INFO L225 Difference]: With dead ends: 91 [2022-11-19 07:29:35,004 INFO L226 Difference]: Without dead ends: 56 [2022-11-19 07:29:35,006 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2715 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=1183, Invalid=9119, Unknown=0, NotChecked=0, Total=10302 [2022-11-19 07:29:35,007 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 87 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 651 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 773 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 651 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-19 07:29:35,007 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 50 Invalid, 773 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 651 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-19 07:29:35,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-11-19 07:29:35,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 53. [2022-11-19 07:29:35,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.1923076923076923) internal successors, (62), 52 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:29:35,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 62 transitions. [2022-11-19 07:29:35,049 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 62 transitions. Word has length 43 [2022-11-19 07:29:35,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:29:35,050 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 62 transitions. [2022-11-19 07:29:35,050 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 1.7222222222222223) internal successors, (124), 72 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:29:35,050 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 62 transitions. [2022-11-19 07:29:35,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-19 07:29:35,051 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:29:35,051 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 9, 9, 1, 1, 1, 1, 1] [2022-11-19 07:29:35,058 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-19 07:29:35,257 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-19 07:29:35,257 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:29:35,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:29:35,258 INFO L85 PathProgramCache]: Analyzing trace with hash -1857533990, now seen corresponding path program 12 times [2022-11-19 07:29:35,258 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:29:35,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476873145] [2022-11-19 07:29:35,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:29:35,258 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:29:35,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:29:35,934 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 45 proven. 147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:29:35,934 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:29:35,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476873145] [2022-11-19 07:29:35,935 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1476873145] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:29:35,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087443951] [2022-11-19 07:29:35,935 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:29:35,935 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:29:35,935 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:29:35,940 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:29:35,955 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-19 07:29:36,030 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:29:36,030 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:29:36,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 39 conjunts are in the unsatisfiable core [2022-11-19 07:29:36,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:29:36,562 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:29:36,562 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:29:37,151 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:29:37,151 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1087443951] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:29:37,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [722122193] [2022-11-19 07:29:37,152 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:29:37,152 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:29:37,152 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:29:37,152 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:29:37,153 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:29:37,284 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:29:37,929 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5401#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:29:37,929 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:29:37,929 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:29:37,929 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2022-11-19 07:29:37,929 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125137371] [2022-11-19 07:29:37,930 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:29:37,930 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-19 07:29:37,930 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:29:37,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-19 07:29:37,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=394, Invalid=2362, Unknown=0, NotChecked=0, Total=2756 [2022-11-19 07:29:37,932 INFO L87 Difference]: Start difference. First operand 53 states and 62 transitions. Second operand has 47 states, 47 states have (on average 1.4893617021276595) internal successors, (70), 47 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:29:38,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:29:38,831 INFO L93 Difference]: Finished difference Result 90 states and 100 transitions. [2022-11-19 07:29:38,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-19 07:29:38,832 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.4893617021276595) internal successors, (70), 47 states have internal predecessors, (70), 0 states have call successors, (0), 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 07:29:38,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:29:38,833 INFO L225 Difference]: With dead ends: 90 [2022-11-19 07:29:38,833 INFO L226 Difference]: Without dead ends: 88 [2022-11-19 07:29:38,834 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 93 SyntacticMatches, 10 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1721 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=907, Invalid=4643, Unknown=0, NotChecked=0, Total=5550 [2022-11-19 07:29:38,835 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 164 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 164 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 439 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:29:38,835 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [164 Valid, 43 Invalid, 439 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 349 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:29:38,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-19 07:29:38,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 48. [2022-11-19 07:29:38,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 47 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 07:29:38,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2022-11-19 07:29:38,894 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 44 [2022-11-19 07:29:38,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:29:38,895 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2022-11-19 07:29:38,895 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.4893617021276595) internal successors, (70), 47 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:29:38,895 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2022-11-19 07:29:38,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-19 07:29:38,896 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:29:38,896 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1, 1] [2022-11-19 07:29:38,903 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-19 07:29:39,099 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-19 07:29:39,099 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:29:39,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:29:39,100 INFO L85 PathProgramCache]: Analyzing trace with hash -1431629180, now seen corresponding path program 13 times [2022-11-19 07:29:39,100 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:29:39,100 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233920822] [2022-11-19 07:29:39,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:29:39,100 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:29:39,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:29:40,533 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 117 proven. 104 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:29:40,533 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:29:40,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233920822] [2022-11-19 07:29:40,533 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1233920822] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:29:40,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1830401541] [2022-11-19 07:29:40,534 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:29:40,534 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:29:40,534 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:29:40,535 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:29:40,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-19 07:29:40,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:29:40,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-19 07:29:40,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:29:41,478 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:29:41,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:29:43,534 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:29:43,534 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1830401541] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:29:43,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [30042977] [2022-11-19 07:29:43,536 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:29:43,536 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:29:43,537 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:29:43,537 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:29:43,537 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:29:43,634 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:29:44,388 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6022#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:29:44,388 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:29:44,388 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:29:44,388 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 63 [2022-11-19 07:29:44,389 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1706189865] [2022-11-19 07:29:44,389 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:29:44,389 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-11-19 07:29:44,390 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:29:44,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-11-19 07:29:44,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=609, Invalid=4083, Unknown=0, NotChecked=0, Total=4692 [2022-11-19 07:29:44,391 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand has 63 states, 63 states have (on average 2.0) internal successors, (126), 63 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:29:50,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:29:50,452 INFO L93 Difference]: Finished difference Result 132 states and 147 transitions. [2022-11-19 07:29:50,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-11-19 07:29:50,452 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 2.0) internal successors, (126), 63 states have internal predecessors, (126), 0 states have call successors, (0), 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 47 [2022-11-19 07:29:50,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:29:50,453 INFO L225 Difference]: With dead ends: 132 [2022-11-19 07:29:50,453 INFO L226 Difference]: Without dead ends: 94 [2022-11-19 07:29:50,455 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3515 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=1766, Invalid=11806, Unknown=0, NotChecked=0, Total=13572 [2022-11-19 07:29:50,456 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 207 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 1395 mSolverCounterSat, 194 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 1589 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 194 IncrementalHoareTripleChecker+Valid, 1395 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:29:50,456 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [207 Valid, 160 Invalid, 1589 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [194 Valid, 1395 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-11-19 07:29:50,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-11-19 07:29:50,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 63. [2022-11-19 07:29:50,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.2096774193548387) internal successors, (75), 62 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 07:29:50,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 75 transitions. [2022-11-19 07:29:50,533 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 75 transitions. Word has length 47 [2022-11-19 07:29:50,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:29:50,533 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 75 transitions. [2022-11-19 07:29:50,533 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 2.0) internal successors, (126), 63 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:29:50,533 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 75 transitions. [2022-11-19 07:29:50,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-19 07:29:50,534 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:29:50,534 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1, 1, 1, 1] [2022-11-19 07:29:50,539 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-19 07:29:50,735 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-19 07:29:50,735 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:29:50,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:29:50,735 INFO L85 PathProgramCache]: Analyzing trace with hash -1237897350, now seen corresponding path program 14 times [2022-11-19 07:29:50,736 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:29:50,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [285216978] [2022-11-19 07:29:50,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:29:50,736 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:29:50,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:29:52,334 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 145 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:29:52,335 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:29:52,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [285216978] [2022-11-19 07:29:52,335 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [285216978] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:29:52,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1828548151] [2022-11-19 07:29:52,335 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:29:52,335 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:29:52,335 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:29:52,336 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:29:52,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-19 07:29:52,433 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-19 07:29:52,433 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:29:52,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-19 07:29:52,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:29:54,177 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:29:54,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:29:57,046 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:29:57,046 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1828548151] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:29:57,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [573914223] [2022-11-19 07:29:57,048 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:29:57,048 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:29:57,048 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:29:57,049 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:29:57,049 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:29:57,157 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:29:57,970 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6842#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:29:57,970 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:29:57,970 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:29:57,970 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 30, 30] total 84 [2022-11-19 07:29:57,970 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139251676] [2022-11-19 07:29:57,970 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:29:57,971 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2022-11-19 07:29:57,971 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:29:57,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2022-11-19 07:29:57,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=879, Invalid=7131, Unknown=0, NotChecked=0, Total=8010 [2022-11-19 07:29:57,973 INFO L87 Difference]: Start difference. First operand 63 states and 75 transitions. Second operand has 84 states, 84 states have (on average 1.7619047619047619) internal successors, (148), 84 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:30:02,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:30:02,826 INFO L93 Difference]: Finished difference Result 107 states and 120 transitions. [2022-11-19 07:30:02,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-19 07:30:02,827 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 1.7619047619047619) internal successors, (148), 84 states have internal predecessors, (148), 0 states have call successors, (0), 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 51 [2022-11-19 07:30:02,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:30:02,827 INFO L225 Difference]: With dead ends: 107 [2022-11-19 07:30:02,827 INFO L226 Difference]: Without dead ends: 66 [2022-11-19 07:30:02,829 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3649 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=1565, Invalid=12241, Unknown=0, NotChecked=0, Total=13806 [2022-11-19 07:30:02,830 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 126 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 1198 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 1350 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 1198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-19 07:30:02,830 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [126 Valid, 71 Invalid, 1350 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 1198 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-19 07:30:02,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-19 07:30:02,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 63. [2022-11-19 07:30:02,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.1935483870967742) internal successors, (74), 62 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:30:02,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 74 transitions. [2022-11-19 07:30:02,897 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 74 transitions. Word has length 51 [2022-11-19 07:30:02,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:30:02,897 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 74 transitions. [2022-11-19 07:30:02,897 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 1.7619047619047619) internal successors, (148), 84 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:30:02,897 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 74 transitions. [2022-11-19 07:30:02,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-19 07:30:02,898 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:30:02,898 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 11, 11, 1, 1, 1, 1, 1] [2022-11-19 07:30:02,903 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-19 07:30:03,098 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-19 07:30:03,099 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:30:03,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:30:03,099 INFO L85 PathProgramCache]: Analyzing trace with hash 1541753754, now seen corresponding path program 15 times [2022-11-19 07:30:03,099 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:30:03,099 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [605644539] [2022-11-19 07:30:03,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:30:03,100 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:30:03,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:30:03,899 INFO L134 CoverageAnalysis]: Checked inductivity of 278 backedges. 66 proven. 212 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:30:03,900 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:30:03,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [605644539] [2022-11-19 07:30:03,900 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [605644539] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:30:03,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [412037732] [2022-11-19 07:30:03,900 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:30:03,901 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:30:03,901 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:30:03,902 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:30:03,907 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-19 07:30:03,984 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:30:03,984 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:30:03,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-19 07:30:03,988 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:30:04,554 INFO L134 CoverageAnalysis]: Checked inductivity of 278 backedges. 0 proven. 278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:30:04,554 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:30:05,230 INFO L134 CoverageAnalysis]: Checked inductivity of 278 backedges. 0 proven. 278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:30:05,230 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [412037732] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:30:05,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [255567235] [2022-11-19 07:30:05,231 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:30:05,231 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:30:05,231 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:30:05,231 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:30:05,232 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:30:05,337 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:30:06,035 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7557#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:30:06,035 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:30:06,035 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:30:06,035 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2022-11-19 07:30:06,035 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480617630] [2022-11-19 07:30:06,036 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:30:06,036 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-11-19 07:30:06,036 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:30:06,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-11-19 07:30:06,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=525, Invalid=3135, Unknown=0, NotChecked=0, Total=3660 [2022-11-19 07:30:06,038 INFO L87 Difference]: Start difference. First operand 63 states and 74 transitions. Second operand has 55 states, 55 states have (on average 1.490909090909091) internal successors, (82), 55 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:30:07,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:30:07,172 INFO L93 Difference]: Finished difference Result 106 states and 118 transitions. [2022-11-19 07:30:07,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-19 07:30:07,173 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.490909090909091) internal successors, (82), 55 states have internal predecessors, (82), 0 states have call successors, (0), 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 52 [2022-11-19 07:30:07,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:30:07,174 INFO L225 Difference]: With dead ends: 106 [2022-11-19 07:30:07,174 INFO L226 Difference]: Without dead ends: 104 [2022-11-19 07:30:07,174 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 111 SyntacticMatches, 12 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2375 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1223, Invalid=6259, Unknown=0, NotChecked=0, Total=7482 [2022-11-19 07:30:07,175 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 173 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 474 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 173 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 571 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 474 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:30:07,175 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [173 Valid, 55 Invalid, 571 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 474 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:30:07,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2022-11-19 07:30:07,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 56. [2022-11-19 07:30:07,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 55 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 07:30:07,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2022-11-19 07:30:07,231 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 52 [2022-11-19 07:30:07,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:30:07,231 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2022-11-19 07:30:07,231 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 1.490909090909091) internal successors, (82), 55 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:30:07,232 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2022-11-19 07:30:07,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-11-19 07:30:07,232 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:30:07,232 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 1, 1, 1, 1, 1] [2022-11-19 07:30:07,238 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-19 07:30:07,433 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:30:07,433 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:30:07,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:30:07,433 INFO L85 PathProgramCache]: Analyzing trace with hash 10647236, now seen corresponding path program 16 times [2022-11-19 07:30:07,434 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:30:07,434 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1115203590] [2022-11-19 07:30:07,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:30:07,434 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:30:07,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:30:09,159 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 176 proven. 137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:30:09,160 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:30:09,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1115203590] [2022-11-19 07:30:09,160 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1115203590] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:30:09,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [760534746] [2022-11-19 07:30:09,161 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:30:09,161 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:30:09,161 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:30:09,163 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:30:09,175 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-19 07:30:09,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:30:09,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-19 07:30:09,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:30:10,333 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 0 proven. 313 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:30:10,333 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:30:12,973 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 0 proven. 313 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:30:12,973 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [760534746] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:30:12,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1510673690] [2022-11-19 07:30:12,974 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:30:12,975 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:30:12,975 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:30:12,975 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:30:12,975 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:30:13,089 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:30:13,906 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8286#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:30:13,907 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:30:13,907 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:30:13,907 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 73 [2022-11-19 07:30:13,907 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760426958] [2022-11-19 07:30:13,907 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:30:13,907 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-11-19 07:30:13,908 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:30:13,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-11-19 07:30:13,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=802, Invalid=5360, Unknown=0, NotChecked=0, Total=6162 [2022-11-19 07:30:13,909 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand has 73 states, 73 states have (on average 2.0273972602739727) internal successors, (148), 73 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:30:21,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:30:21,729 INFO L93 Difference]: Finished difference Result 154 states and 171 transitions. [2022-11-19 07:30:21,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-11-19 07:30:21,730 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 2.0273972602739727) internal successors, (148), 73 states have internal predecessors, (148), 0 states have call successors, (0), 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 55 [2022-11-19 07:30:21,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:30:21,731 INFO L225 Difference]: With dead ends: 154 [2022-11-19 07:30:21,731 INFO L226 Difference]: Without dead ends: 110 [2022-11-19 07:30:21,732 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4723 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=2345, Invalid=15745, Unknown=0, NotChecked=0, Total=18090 [2022-11-19 07:30:21,733 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 256 mSDsluCounter, 205 mSDsCounter, 0 mSdLazyCounter, 1803 mSolverCounterSat, 268 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 208 SdHoareTripleChecker+Invalid, 2071 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 268 IncrementalHoareTripleChecker+Valid, 1803 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-19 07:30:21,735 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [256 Valid, 208 Invalid, 2071 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [268 Valid, 1803 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-19 07:30:21,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-11-19 07:30:21,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 73. [2022-11-19 07:30:21,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.2083333333333333) internal successors, (87), 72 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 07:30:21,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 87 transitions. [2022-11-19 07:30:21,806 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 87 transitions. Word has length 55 [2022-11-19 07:30:21,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:30:21,806 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 87 transitions. [2022-11-19 07:30:21,806 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 2.0273972602739727) internal successors, (148), 73 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:30:21,806 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 87 transitions. [2022-11-19 07:30:21,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-19 07:30:21,807 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:30:21,807 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1, 1, 1, 1] [2022-11-19 07:30:21,815 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-19 07:30:22,012 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:30:22,013 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:30:22,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:30:22,013 INFO L85 PathProgramCache]: Analyzing trace with hash -1308327110, now seen corresponding path program 17 times [2022-11-19 07:30:22,013 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:30:22,013 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1517654551] [2022-11-19 07:30:22,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:30:22,014 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:30:22,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:30:23,709 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 210 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:30:23,709 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:30:23,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1517654551] [2022-11-19 07:30:23,710 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1517654551] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:30:23,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1480016744] [2022-11-19 07:30:23,710 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:30:23,710 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:30:23,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:30:23,711 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:30:23,714 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-19 07:30:23,810 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2022-11-19 07:30:23,810 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:30:23,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 56 conjunts are in the unsatisfiable core [2022-11-19 07:30:23,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:30:25,984 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:30:25,984 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:30:29,446 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:30:29,446 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1480016744] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:30:29,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [197801236] [2022-11-19 07:30:29,448 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:30:29,448 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:30:29,448 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:30:29,449 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:30:29,449 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:30:29,559 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:30:30,603 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9238#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:30:30,603 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:30:30,603 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:30:30,604 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 34, 34] total 96 [2022-11-19 07:30:30,604 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160877912] [2022-11-19 07:30:30,604 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:30:30,605 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2022-11-19 07:30:30,605 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:30:30,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2022-11-19 07:30:30,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1125, Invalid=9177, Unknown=0, NotChecked=0, Total=10302 [2022-11-19 07:30:30,607 INFO L87 Difference]: Start difference. First operand 73 states and 87 transitions. Second operand has 96 states, 96 states have (on average 1.7916666666666667) internal successors, (172), 96 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:30:37,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:30:37,055 INFO L93 Difference]: Finished difference Result 123 states and 138 transitions. [2022-11-19 07:30:37,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-19 07:30:37,055 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 96 states have (on average 1.7916666666666667) internal successors, (172), 96 states have internal predecessors, (172), 0 states have call successors, (0), 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 59 [2022-11-19 07:30:37,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:30:37,056 INFO L225 Difference]: With dead ends: 123 [2022-11-19 07:30:37,056 INFO L226 Difference]: Without dead ends: 76 [2022-11-19 07:30:37,058 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4719 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=2003, Invalid=15819, Unknown=0, NotChecked=0, Total=17822 [2022-11-19 07:30:37,059 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 132 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 1277 mSolverCounterSat, 174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 1451 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 174 IncrementalHoareTripleChecker+Valid, 1277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:30:37,059 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [132 Valid, 73 Invalid, 1451 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [174 Valid, 1277 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-19 07:30:37,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-11-19 07:30:37,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 73. [2022-11-19 07:30:37,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.1944444444444444) internal successors, (86), 72 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:30:37,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 86 transitions. [2022-11-19 07:30:37,153 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 86 transitions. Word has length 59 [2022-11-19 07:30:37,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:30:37,154 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 86 transitions. [2022-11-19 07:30:37,154 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 96 states, 96 states have (on average 1.7916666666666667) internal successors, (172), 96 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:30:37,154 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 86 transitions. [2022-11-19 07:30:37,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-19 07:30:37,154 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:30:37,154 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 13, 13, 1, 1, 1, 1, 1] [2022-11-19 07:30:37,163 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-19 07:30:37,355 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:30:37,355 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:30:37,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:30:37,356 INFO L85 PathProgramCache]: Analyzing trace with hash -832274598, now seen corresponding path program 18 times [2022-11-19 07:30:37,356 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:30:37,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1556993080] [2022-11-19 07:30:37,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:30:37,356 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:30:37,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:30:38,390 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 91 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:30:38,390 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:30:38,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1556993080] [2022-11-19 07:30:38,391 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1556993080] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:30:38,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1873291507] [2022-11-19 07:30:38,391 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:30:38,391 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:30:38,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:30:38,393 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:30:38,428 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-19 07:30:38,493 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:30:38,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:30:38,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 51 conjunts are in the unsatisfiable core [2022-11-19 07:30:38,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:30:39,184 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:30:39,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:30:40,017 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:30:40,017 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1873291507] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:30:40,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [16613450] [2022-11-19 07:30:40,018 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:30:40,019 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:30:40,019 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:30:40,019 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:30:40,019 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:30:40,125 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:30:40,709 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10063#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:30:40,709 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:30:40,709 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:30:40,710 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2022-11-19 07:30:40,710 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690193639] [2022-11-19 07:30:40,710 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:30:40,710 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-11-19 07:30:40,710 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:30:40,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-11-19 07:30:40,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=676, Invalid=4016, Unknown=0, NotChecked=0, Total=4692 [2022-11-19 07:30:40,711 INFO L87 Difference]: Start difference. First operand 73 states and 86 transitions. Second operand has 63 states, 63 states have (on average 1.492063492063492) internal successors, (94), 63 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:30:42,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:30:42,153 INFO L93 Difference]: Finished difference Result 122 states and 136 transitions. [2022-11-19 07:30:42,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-19 07:30:42,155 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.492063492063492) internal successors, (94), 63 states have internal predecessors, (94), 0 states have call successors, (0), 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 07:30:42,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:30:42,156 INFO L225 Difference]: With dead ends: 122 [2022-11-19 07:30:42,156 INFO L226 Difference]: Without dead ends: 120 [2022-11-19 07:30:42,157 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 129 SyntacticMatches, 14 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3133 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1587, Invalid=8115, Unknown=0, NotChecked=0, Total=9702 [2022-11-19 07:30:42,158 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 180 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 604 mSolverCounterSat, 118 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 722 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 118 IncrementalHoareTripleChecker+Valid, 604 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:30:42,158 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [180 Valid, 57 Invalid, 722 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [118 Valid, 604 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:30:42,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2022-11-19 07:30:42,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 64. [2022-11-19 07:30:42,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 63 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:30:42,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2022-11-19 07:30:42,225 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 60 [2022-11-19 07:30:42,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:30:42,225 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2022-11-19 07:30:42,225 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.492063492063492) internal successors, (94), 63 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:30:42,225 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2022-11-19 07:30:42,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-11-19 07:30:42,226 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:30:42,226 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 14, 14, 1, 1, 1, 1, 1] [2022-11-19 07:30:42,231 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-19 07:30:42,428 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-19 07:30:42,428 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:30:42,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:30:42,429 INFO L85 PathProgramCache]: Analyzing trace with hash 558476036, now seen corresponding path program 19 times [2022-11-19 07:30:42,429 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:30:42,429 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2118217469] [2022-11-19 07:30:42,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:30:42,429 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:30:42,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:30:44,478 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 247 proven. 174 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:30:44,478 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:30:44,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2118217469] [2022-11-19 07:30:44,479 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2118217469] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:30:44,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [691772768] [2022-11-19 07:30:44,479 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:30:44,479 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:30:44,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:30:44,481 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:30:44,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-19 07:30:44,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:30:44,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-19 07:30:44,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:30:45,831 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:30:45,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:30:49,227 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:30:49,227 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [691772768] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:30:49,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1679903307] [2022-11-19 07:30:49,228 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:30:49,228 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:30:49,228 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:30:49,229 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:30:49,229 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:30:49,329 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:30:50,228 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10900#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:30:50,228 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:30:50,228 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:30:50,228 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 83 [2022-11-19 07:30:50,228 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732737664] [2022-11-19 07:30:50,229 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:30:50,229 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2022-11-19 07:30:50,229 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:30:50,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2022-11-19 07:30:50,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1023, Invalid=6809, Unknown=0, NotChecked=0, Total=7832 [2022-11-19 07:30:50,231 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand has 83 states, 83 states have (on average 2.0481927710843375) internal successors, (170), 83 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:31:00,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:31:00,642 INFO L93 Difference]: Finished difference Result 176 states and 195 transitions. [2022-11-19 07:31:00,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2022-11-19 07:31:00,643 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 2.0481927710843375) internal successors, (170), 83 states have internal predecessors, (170), 0 states have call successors, (0), 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 63 [2022-11-19 07:31:00,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:31:00,643 INFO L225 Difference]: With dead ends: 176 [2022-11-19 07:31:00,644 INFO L226 Difference]: Without dead ends: 126 [2022-11-19 07:31:00,645 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6107 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=3008, Invalid=20248, Unknown=0, NotChecked=0, Total=23256 [2022-11-19 07:31:00,645 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 314 mSDsluCounter, 274 mSDsCounter, 0 mSdLazyCounter, 2395 mSolverCounterSat, 338 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 314 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 2733 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 338 IncrementalHoareTripleChecker+Valid, 2395 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:31:00,646 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [314 Valid, 277 Invalid, 2733 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [338 Valid, 2395 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-11-19 07:31:00,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-11-19 07:31:00,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 83. [2022-11-19 07:31:00,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.2073170731707317) internal successors, (99), 82 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 07:31:00,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 99 transitions. [2022-11-19 07:31:00,771 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 99 transitions. Word has length 63 [2022-11-19 07:31:00,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:31:00,771 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 99 transitions. [2022-11-19 07:31:00,771 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 2.0481927710843375) internal successors, (170), 83 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:31:00,771 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 99 transitions. [2022-11-19 07:31:00,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-11-19 07:31:00,772 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:31:00,772 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 15, 15, 1, 1, 1, 1, 1] [2022-11-19 07:31:00,779 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-19 07:31:00,972 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:31:00,973 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:31:00,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:31:00,973 INFO L85 PathProgramCache]: Analyzing trace with hash 1798309626, now seen corresponding path program 20 times [2022-11-19 07:31:00,973 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:31:00,973 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1664423074] [2022-11-19 07:31:00,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:31:00,973 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:31:00,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:31:03,459 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 287 proven. 194 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:31:03,459 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:31:03,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1664423074] [2022-11-19 07:31:03,460 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1664423074] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:31:03,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1266673910] [2022-11-19 07:31:03,460 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:31:03,460 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:31:03,460 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:31:03,461 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:31:03,479 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-19 07:31:03,587 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-11-19 07:31:03,587 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:31:03,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 62 conjunts are in the unsatisfiable core [2022-11-19 07:31:03,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:31:06,258 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:31:06,258 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:31:10,313 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:31:10,314 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1266673910] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:31:10,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [392798875] [2022-11-19 07:31:10,316 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:31:10,316 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:31:10,316 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:31:10,317 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:31:10,317 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:31:10,400 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:31:11,367 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11984#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:31:11,368 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:31:11,368 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:31:11,368 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 38, 38] total 108 [2022-11-19 07:31:11,368 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891847181] [2022-11-19 07:31:11,368 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:31:11,369 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 108 states [2022-11-19 07:31:11,369 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:31:11,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2022-11-19 07:31:11,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1403, Invalid=11479, Unknown=0, NotChecked=0, Total=12882 [2022-11-19 07:31:11,371 INFO L87 Difference]: Start difference. First operand 83 states and 99 transitions. Second operand has 108 states, 108 states have (on average 1.8148148148148149) internal successors, (196), 108 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 07:31:19,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:31:19,519 INFO L93 Difference]: Finished difference Result 139 states and 156 transitions. [2022-11-19 07:31:19,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-11-19 07:31:19,520 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 108 states have (on average 1.8148148148148149) internal successors, (196), 108 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 67 [2022-11-19 07:31:19,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:31:19,521 INFO L225 Difference]: With dead ends: 139 [2022-11-19 07:31:19,521 INFO L226 Difference]: Without dead ends: 86 [2022-11-19 07:31:19,522 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5925 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=2497, Invalid=19853, Unknown=0, NotChecked=0, Total=22350 [2022-11-19 07:31:19,523 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 148 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 1523 mSolverCounterSat, 197 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 1720 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 197 IncrementalHoareTripleChecker+Valid, 1523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:31:19,523 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [148 Valid, 78 Invalid, 1720 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [197 Valid, 1523 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-11-19 07:31:19,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-11-19 07:31:19,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 83. [2022-11-19 07:31:19,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.1951219512195121) internal successors, (98), 82 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 07:31:19,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 98 transitions. [2022-11-19 07:31:19,636 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 98 transitions. Word has length 67 [2022-11-19 07:31:19,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:31:19,636 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 98 transitions. [2022-11-19 07:31:19,636 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 108 states, 108 states have (on average 1.8148148148148149) internal successors, (196), 108 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 07:31:19,636 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 98 transitions. [2022-11-19 07:31:19,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-19 07:31:19,637 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:31:19,637 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 15, 15, 1, 1, 1, 1, 1] [2022-11-19 07:31:19,651 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-11-19 07:31:19,844 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-19 07:31:19,844 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:31:19,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:31:19,844 INFO L85 PathProgramCache]: Analyzing trace with hash -1637752038, now seen corresponding path program 21 times [2022-11-19 07:31:19,844 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:31:19,844 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1003968658] [2022-11-19 07:31:19,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:31:19,845 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:31:19,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:31:21,087 INFO L134 CoverageAnalysis]: Checked inductivity of 498 backedges. 120 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:31:21,087 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:31:21,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1003968658] [2022-11-19 07:31:21,088 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1003968658] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:31:21,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [774005383] [2022-11-19 07:31:21,088 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:31:21,088 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:31:21,088 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:31:21,091 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:31:21,120 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-19 07:31:21,197 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:31:21,198 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:31:21,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 57 conjunts are in the unsatisfiable core [2022-11-19 07:31:21,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:31:22,094 INFO L134 CoverageAnalysis]: Checked inductivity of 498 backedges. 0 proven. 498 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:31:22,094 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:31:23,160 INFO L134 CoverageAnalysis]: Checked inductivity of 498 backedges. 0 proven. 498 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:31:23,160 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [774005383] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:31:23,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [526497150] [2022-11-19 07:31:23,161 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:31:23,162 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:31:23,162 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:31:23,162 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:31:23,162 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:31:23,272 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:31:23,944 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12919#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:31:23,944 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:31:23,944 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:31:23,944 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 71 [2022-11-19 07:31:23,945 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121313070] [2022-11-19 07:31:23,946 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:31:23,946 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2022-11-19 07:31:23,946 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:31:23,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2022-11-19 07:31:23,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=847, Invalid=5005, Unknown=0, NotChecked=0, Total=5852 [2022-11-19 07:31:23,948 INFO L87 Difference]: Start difference. First operand 83 states and 98 transitions. Second operand has 71 states, 71 states have (on average 1.4929577464788732) internal successors, (106), 71 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:31:25,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:31:25,732 INFO L93 Difference]: Finished difference Result 138 states and 154 transitions. [2022-11-19 07:31:25,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-19 07:31:25,733 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 1.4929577464788732) internal successors, (106), 71 states have internal predecessors, (106), 0 states have call successors, (0), 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 07:31:25,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:31:25,734 INFO L225 Difference]: With dead ends: 138 [2022-11-19 07:31:25,734 INFO L226 Difference]: Without dead ends: 136 [2022-11-19 07:31:25,735 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 147 SyntacticMatches, 16 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3995 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=1999, Invalid=10211, Unknown=0, NotChecked=0, Total=12210 [2022-11-19 07:31:25,735 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 241 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 679 mSolverCounterSat, 153 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 832 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 153 IncrementalHoareTripleChecker+Valid, 679 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-19 07:31:25,736 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [241 Valid, 56 Invalid, 832 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [153 Valid, 679 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-19 07:31:25,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2022-11-19 07:31:25,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 72. [2022-11-19 07:31:25,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.028169014084507) internal successors, (73), 71 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 07:31:25,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2022-11-19 07:31:25,835 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 68 [2022-11-19 07:31:25,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:31:25,835 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2022-11-19 07:31:25,835 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 1.4929577464788732) internal successors, (106), 71 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:31:25,835 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2022-11-19 07:31:25,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-11-19 07:31:25,836 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:31:25,836 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 16, 16, 1, 1, 1, 1, 1] [2022-11-19 07:31:25,847 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-19 07:31:26,036 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-11-19 07:31:26,037 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:31:26,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:31:26,037 INFO L85 PathProgramCache]: Analyzing trace with hash 562343748, now seen corresponding path program 22 times [2022-11-19 07:31:26,037 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:31:26,037 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1972216113] [2022-11-19 07:31:26,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:31:26,037 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:31:26,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:31:28,709 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 330 proven. 215 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:31:28,710 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:31:28,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1972216113] [2022-11-19 07:31:28,710 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1972216113] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:31:28,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [107309425] [2022-11-19 07:31:28,710 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:31:28,710 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:31:28,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:31:28,711 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:31:28,714 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-19 07:31:28,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:31:28,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 284 conjuncts, 76 conjunts are in the unsatisfiable core [2022-11-19 07:31:28,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:31:30,342 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:31:30,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:31:34,179 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:31:34,179 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [107309425] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:31:34,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1053590932] [2022-11-19 07:31:34,180 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:31:34,180 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:31:34,180 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:31:34,180 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:31:34,180 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:31:34,266 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:31:35,297 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13864#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:31:35,297 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:31:35,297 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:31:35,297 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 93 [2022-11-19 07:31:35,297 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709115936] [2022-11-19 07:31:35,297 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:31:35,298 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2022-11-19 07:31:35,298 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:31:35,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2022-11-19 07:31:35,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1272, Invalid=8430, Unknown=0, NotChecked=0, Total=9702 [2022-11-19 07:31:35,300 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand has 93 states, 93 states have (on average 2.064516129032258) internal successors, (192), 93 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:31:48,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:31:48,341 INFO L93 Difference]: Finished difference Result 198 states and 219 transitions. [2022-11-19 07:31:48,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2022-11-19 07:31:48,348 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 2.064516129032258) internal successors, (192), 93 states have internal predecessors, (192), 0 states have call successors, (0), 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 71 [2022-11-19 07:31:48,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:31:48,349 INFO L225 Difference]: With dead ends: 198 [2022-11-19 07:31:48,350 INFO L226 Difference]: Without dead ends: 142 [2022-11-19 07:31:48,351 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7667 ImplicationChecksByTransitivity, 16.5s TimeCoverageRelationStatistics Valid=3755, Invalid=25315, Unknown=0, NotChecked=0, Total=29070 [2022-11-19 07:31:48,352 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 371 mSDsluCounter, 346 mSDsCounter, 0 mSdLazyCounter, 3163 mSolverCounterSat, 417 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 371 SdHoareTripleChecker+Valid, 349 SdHoareTripleChecker+Invalid, 3580 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 417 IncrementalHoareTripleChecker+Valid, 3163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-11-19 07:31:48,352 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [371 Valid, 349 Invalid, 3580 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [417 Valid, 3163 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-11-19 07:31:48,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2022-11-19 07:31:48,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 93. [2022-11-19 07:31:48,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.2065217391304348) internal successors, (111), 92 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 07:31:48,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 111 transitions. [2022-11-19 07:31:48,514 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 111 transitions. Word has length 71 [2022-11-19 07:31:48,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:31:48,515 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 111 transitions. [2022-11-19 07:31:48,515 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 93 states have (on average 2.064516129032258) internal successors, (192), 93 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:31:48,515 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 111 transitions. [2022-11-19 07:31:48,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-11-19 07:31:48,516 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:31:48,516 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 17, 17, 1, 1, 1, 1, 1] [2022-11-19 07:31:48,522 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-19 07:31:48,717 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-19 07:31:48,717 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:31:48,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:31:48,717 INFO L85 PathProgramCache]: Analyzing trace with hash 307608250, now seen corresponding path program 23 times [2022-11-19 07:31:48,718 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:31:48,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1738022755] [2022-11-19 07:31:48,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:31:48,718 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:31:48,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:31:51,361 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 376 proven. 237 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:31:51,361 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:31:51,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1738022755] [2022-11-19 07:31:51,361 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1738022755] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:31:51,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1661199935] [2022-11-19 07:31:51,362 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:31:51,362 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:31:51,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:31:51,363 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:31:51,366 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-19 07:31:51,486 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2022-11-19 07:31:51,487 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:31:51,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-19 07:31:51,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:31:54,526 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 0 proven. 613 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:31:54,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:31:59,387 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 0 proven. 613 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:31:59,387 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1661199935] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:31:59,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [59053294] [2022-11-19 07:31:59,388 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:31:59,388 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:31:59,388 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:31:59,389 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:31:59,389 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:31:59,477 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:32:00,511 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15080#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:32:00,512 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:32:00,512 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:32:00,512 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 42, 42] total 120 [2022-11-19 07:32:00,512 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41557698] [2022-11-19 07:32:00,512 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:32:00,513 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 120 states [2022-11-19 07:32:00,513 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:32:00,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2022-11-19 07:32:00,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1713, Invalid=14037, Unknown=0, NotChecked=0, Total=15750 [2022-11-19 07:32:00,515 INFO L87 Difference]: Start difference. First operand 93 states and 111 transitions. Second operand has 120 states, 120 states have (on average 1.8333333333333333) internal successors, (220), 120 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:32:11,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:32:11,317 INFO L93 Difference]: Finished difference Result 155 states and 174 transitions. [2022-11-19 07:32:11,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-11-19 07:32:11,318 INFO L78 Accepts]: Start accepts. Automaton has has 120 states, 120 states have (on average 1.8333333333333333) internal successors, (220), 120 states have internal predecessors, (220), 0 states have call successors, (0), 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 75 [2022-11-19 07:32:11,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:32:11,319 INFO L225 Difference]: With dead ends: 155 [2022-11-19 07:32:11,319 INFO L226 Difference]: Without dead ends: 96 [2022-11-19 07:32:11,321 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7267 ImplicationChecksByTransitivity, 17.8s TimeCoverageRelationStatistics Valid=3047, Invalid=24343, Unknown=0, NotChecked=0, Total=27390 [2022-11-19 07:32:11,322 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 163 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 2303 mSolverCounterSat, 256 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 2559 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 256 IncrementalHoareTripleChecker+Valid, 2303 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-11-19 07:32:11,322 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [163 Valid, 98 Invalid, 2559 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [256 Valid, 2303 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-11-19 07:32:11,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-11-19 07:32:11,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 93. [2022-11-19 07:32:11,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.1956521739130435) internal successors, (110), 92 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:32:11,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 110 transitions. [2022-11-19 07:32:11,490 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 110 transitions. Word has length 75 [2022-11-19 07:32:11,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:32:11,491 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 110 transitions. [2022-11-19 07:32:11,491 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 120 states, 120 states have (on average 1.8333333333333333) internal successors, (220), 120 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:32:11,491 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 110 transitions. [2022-11-19 07:32:11,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-11-19 07:32:11,492 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:32:11,492 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 17, 17, 1, 1, 1, 1, 1] [2022-11-19 07:32:11,499 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-19 07:32:11,698 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-19 07:32:11,699 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:32:11,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:32:11,699 INFO L85 PathProgramCache]: Analyzing trace with hash -596019494, now seen corresponding path program 24 times [2022-11-19 07:32:11,699 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:32:11,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1532967815] [2022-11-19 07:32:11,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:32:11,699 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:32:11,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:32:12,901 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 153 proven. 479 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:32:12,901 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:32:12,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1532967815] [2022-11-19 07:32:12,901 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1532967815] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:32:12,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [391269098] [2022-11-19 07:32:12,901 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:32:12,902 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:32:12,902 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:32:12,903 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:32:12,905 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-19 07:32:13,000 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:32:13,000 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:32:13,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 63 conjunts are in the unsatisfiable core [2022-11-19 07:32:13,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:32:14,013 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 0 proven. 632 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:32:14,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:32:15,295 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 0 proven. 632 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:32:15,295 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [391269098] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:32:15,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [797769886] [2022-11-19 07:32:15,296 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:32:15,296 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:32:15,296 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:32:15,296 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:32:15,296 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:32:15,389 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:32:16,212 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16125#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:32:16,213 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:32:16,213 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:32:16,213 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2022-11-19 07:32:16,213 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1772445034] [2022-11-19 07:32:16,214 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:32:16,214 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-11-19 07:32:16,214 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:32:16,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-11-19 07:32:16,215 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1038, Invalid=6102, Unknown=0, NotChecked=0, Total=7140 [2022-11-19 07:32:16,216 INFO L87 Difference]: Start difference. First operand 93 states and 110 transitions. Second operand has 79 states, 79 states have (on average 1.4936708860759493) internal successors, (118), 79 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 07:32:18,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:32:18,353 INFO L93 Difference]: Finished difference Result 154 states and 172 transitions. [2022-11-19 07:32:18,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-19 07:32:18,353 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 1.4936708860759493) internal successors, (118), 79 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 76 [2022-11-19 07:32:18,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:32:18,355 INFO L225 Difference]: With dead ends: 154 [2022-11-19 07:32:18,355 INFO L226 Difference]: Without dead ends: 152 [2022-11-19 07:32:18,356 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 165 SyntacticMatches, 18 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4961 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=2459, Invalid=12547, Unknown=0, NotChecked=0, Total=15006 [2022-11-19 07:32:18,357 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 291 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 804 mSolverCounterSat, 178 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 291 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 982 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 178 IncrementalHoareTripleChecker+Valid, 804 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-19 07:32:18,357 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [291 Valid, 69 Invalid, 982 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [178 Valid, 804 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-19 07:32:18,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2022-11-19 07:32:18,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 80. [2022-11-19 07:32:18,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0253164556962024) internal successors, (81), 79 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 07:32:18,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2022-11-19 07:32:18,485 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 76 [2022-11-19 07:32:18,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:32:18,486 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2022-11-19 07:32:18,486 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 1.4936708860759493) internal successors, (118), 79 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 07:32:18,486 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2022-11-19 07:32:18,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-19 07:32:18,487 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:32:18,487 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 18, 18, 1, 1, 1, 1, 1] [2022-11-19 07:32:18,492 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-19 07:32:18,687 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-19 07:32:18,687 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:32:18,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:32:18,688 INFO L85 PathProgramCache]: Analyzing trace with hash -617118844, now seen corresponding path program 25 times [2022-11-19 07:32:18,688 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:32:18,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2020206288] [2022-11-19 07:32:18,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:32:18,688 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:32:18,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:32:21,401 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 425 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:32:21,401 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:32:21,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2020206288] [2022-11-19 07:32:21,401 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2020206288] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:32:21,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [383117181] [2022-11-19 07:32:21,402 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:32:21,402 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:32:21,402 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:32:21,409 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:32:21,413 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-19 07:32:21,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:32:21,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 84 conjunts are in the unsatisfiable core [2022-11-19 07:32:21,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:32:23,393 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:32:23,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:32:28,105 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:32:28,105 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [383117181] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:32:28,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1901573385] [2022-11-19 07:32:28,107 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:32:28,107 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:32:28,107 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:32:28,107 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:32:28,107 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:32:28,198 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:32:29,265 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17178#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:32:29,265 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:32:29,265 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:32:29,266 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 103 [2022-11-19 07:32:29,266 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527363637] [2022-11-19 07:32:29,266 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:32:29,267 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2022-11-19 07:32:29,267 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:32:29,268 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2022-11-19 07:32:29,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1549, Invalid=10223, Unknown=0, NotChecked=0, Total=11772 [2022-11-19 07:32:29,269 INFO L87 Difference]: Start difference. First operand 80 states and 81 transitions. Second operand has 103 states, 103 states have (on average 2.0776699029126213) internal successors, (214), 103 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:32:45,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:32:45,698 INFO L93 Difference]: Finished difference Result 220 states and 243 transitions. [2022-11-19 07:32:45,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2022-11-19 07:32:45,698 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 2.0776699029126213) internal successors, (214), 103 states have internal predecessors, (214), 0 states have call successors, (0), 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 79 [2022-11-19 07:32:45,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:32:45,699 INFO L225 Difference]: With dead ends: 220 [2022-11-19 07:32:45,700 INFO L226 Difference]: Without dead ends: 158 [2022-11-19 07:32:45,702 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 358 GetRequests, 171 SyntacticMatches, 0 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9403 ImplicationChecksByTransitivity, 20.4s TimeCoverageRelationStatistics Valid=4586, Invalid=30946, Unknown=0, NotChecked=0, Total=35532 [2022-11-19 07:32:45,703 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 438 mSDsluCounter, 417 mSDsCounter, 0 mSdLazyCounter, 3647 mSolverCounterSat, 485 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 438 SdHoareTripleChecker+Valid, 420 SdHoareTripleChecker+Invalid, 4132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 485 IncrementalHoareTripleChecker+Valid, 3647 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:32:45,704 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [438 Valid, 420 Invalid, 4132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [485 Valid, 3647 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2022-11-19 07:32:45,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2022-11-19 07:32:45,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 103. [2022-11-19 07:32:45,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 102 states have (on average 1.2058823529411764) internal successors, (123), 102 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 07:32:45,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 123 transitions. [2022-11-19 07:32:45,921 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 123 transitions. Word has length 79 [2022-11-19 07:32:45,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:32:45,921 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 123 transitions. [2022-11-19 07:32:45,922 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 2.0776699029126213) internal successors, (214), 103 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:32:45,922 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 123 transitions. [2022-11-19 07:32:45,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-11-19 07:32:45,922 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:32:45,923 INFO L195 NwaCegarLoop]: trace histogram [20, 20, 19, 19, 1, 1, 1, 1, 1] [2022-11-19 07:32:45,928 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-19 07:32:46,123 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-19 07:32:46,123 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:32:46,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:32:46,124 INFO L85 PathProgramCache]: Analyzing trace with hash -216949126, now seen corresponding path program 26 times [2022-11-19 07:32:46,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:32:46,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [513123367] [2022-11-19 07:32:46,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:32:46,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:32:46,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:32:49,220 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 477 proven. 284 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:32:49,220 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:32:49,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [513123367] [2022-11-19 07:32:49,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [513123367] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:32:49,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [633816708] [2022-11-19 07:32:49,221 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:32:49,221 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:32:49,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:32:49,222 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:32:49,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-19 07:32:49,374 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2022-11-19 07:32:49,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:32:49,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 80 conjunts are in the unsatisfiable core [2022-11-19 07:32:49,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:32:53,811 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:32:53,811 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:33:00,387 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:33:00,387 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [633816708] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:33:00,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [84421869] [2022-11-19 07:33:00,388 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:33:00,389 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:33:00,389 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:33:00,389 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:33:00,389 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:33:00,500 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:33:01,721 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18530#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:33:01,722 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:33:01,722 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:33:01,722 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 48, 48] total 136 [2022-11-19 07:33:01,722 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931786388] [2022-11-19 07:33:01,722 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:33:01,723 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 136 states [2022-11-19 07:33:01,723 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:33:01,723 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2022-11-19 07:33:01,724 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2166, Invalid=17856, Unknown=0, NotChecked=0, Total=20022 [2022-11-19 07:33:01,725 INFO L87 Difference]: Start difference. First operand 103 states and 123 transitions. Second operand has 136 states, 136 states have (on average 1.7941176470588236) internal successors, (244), 136 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:33:16,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:33:16,139 INFO L93 Difference]: Finished difference Result 171 states and 192 transitions. [2022-11-19 07:33:16,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-11-19 07:33:16,140 INFO L78 Accepts]: Start accepts. Automaton has has 136 states, 136 states have (on average 1.7941176470588236) internal successors, (244), 136 states have internal predecessors, (244), 0 states have call successors, (0), 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 83 [2022-11-19 07:33:16,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:33:16,141 INFO L225 Difference]: With dead ends: 171 [2022-11-19 07:33:16,141 INFO L226 Difference]: Without dead ends: 106 [2022-11-19 07:33:16,143 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9507 ImplicationChecksByTransitivity, 24.4s TimeCoverageRelationStatistics Valid=3848, Invalid=30934, Unknown=0, NotChecked=0, Total=34782 [2022-11-19 07:33:16,144 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 248 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 2163 mSolverCounterSat, 346 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 248 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 2509 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 346 IncrementalHoareTripleChecker+Valid, 2163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-11-19 07:33:16,144 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [248 Valid, 84 Invalid, 2509 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [346 Valid, 2163 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-11-19 07:33:16,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-11-19 07:33:16,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 103. [2022-11-19 07:33:16,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 102 states have (on average 1.196078431372549) internal successors, (122), 102 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:33:16,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 122 transitions. [2022-11-19 07:33:16,360 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 122 transitions. Word has length 83 [2022-11-19 07:33:16,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:33:16,360 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 122 transitions. [2022-11-19 07:33:16,360 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 136 states, 136 states have (on average 1.7941176470588236) internal successors, (244), 136 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:33:16,361 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 122 transitions. [2022-11-19 07:33:16,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-11-19 07:33:16,361 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:33:16,361 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 19, 19, 1, 1, 1, 1, 1] [2022-11-19 07:33:16,367 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-19 07:33:16,561 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:33:16,562 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:33:16,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:33:16,562 INFO L85 PathProgramCache]: Analyzing trace with hash -1270400358, now seen corresponding path program 27 times [2022-11-19 07:33:16,562 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:33:16,562 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1221831637] [2022-11-19 07:33:16,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:33:16,563 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:33:16,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:33:17,962 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 190 proven. 592 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:33:17,962 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:33:17,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1221831637] [2022-11-19 07:33:17,963 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1221831637] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:33:17,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [670290958] [2022-11-19 07:33:17,963 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:33:17,963 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:33:17,963 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:33:17,964 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:33:17,969 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-19 07:33:18,075 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:33:18,075 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:33:18,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 69 conjunts are in the unsatisfiable core [2022-11-19 07:33:18,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:33:19,380 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 0 proven. 782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:33:19,380 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:33:21,008 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 0 proven. 782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:33:21,008 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [670290958] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:33:21,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [238540474] [2022-11-19 07:33:21,009 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:33:21,010 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:33:21,010 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:33:21,010 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:33:21,010 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:33:21,116 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:33:22,080 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19687#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:33:22,080 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:33:22,080 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:33:22,080 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 87 [2022-11-19 07:33:22,081 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1984401076] [2022-11-19 07:33:22,081 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:33:22,081 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2022-11-19 07:33:22,081 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:33:22,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2022-11-19 07:33:22,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1249, Invalid=7307, Unknown=0, NotChecked=0, Total=8556 [2022-11-19 07:33:22,083 INFO L87 Difference]: Start difference. First operand 103 states and 122 transitions. Second operand has 87 states, 87 states have (on average 1.4942528735632183) internal successors, (130), 87 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:33:24,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:33:24,753 INFO L93 Difference]: Finished difference Result 170 states and 190 transitions. [2022-11-19 07:33:24,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-11-19 07:33:24,753 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 1.4942528735632183) internal successors, (130), 87 states have internal predecessors, (130), 0 states have call successors, (0), 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 07:33:24,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:33:24,754 INFO L225 Difference]: With dead ends: 170 [2022-11-19 07:33:24,755 INFO L226 Difference]: Without dead ends: 168 [2022-11-19 07:33:24,756 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 183 SyntacticMatches, 20 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6031 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=2967, Invalid=15123, Unknown=0, NotChecked=0, Total=18090 [2022-11-19 07:33:24,757 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 288 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 942 mSolverCounterSat, 172 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 288 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 1114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 172 IncrementalHoareTripleChecker+Valid, 942 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 07:33:24,758 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [288 Valid, 70 Invalid, 1114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [172 Valid, 942 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-19 07:33:24,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-11-19 07:33:24,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 88. [2022-11-19 07:33:24,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 87 states have (on average 1.0229885057471264) internal successors, (89), 87 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:33:24,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2022-11-19 07:33:24,929 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 84 [2022-11-19 07:33:24,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:33:24,929 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2022-11-19 07:33:24,929 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 87 states have (on average 1.4942528735632183) internal successors, (130), 87 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:33:24,929 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2022-11-19 07:33:24,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-11-19 07:33:24,930 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:33:24,930 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 20, 20, 1, 1, 1, 1, 1] [2022-11-19 07:33:24,937 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-11-19 07:33:25,137 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:33:25,137 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:33:25,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:33:25,137 INFO L85 PathProgramCache]: Analyzing trace with hash 759572420, now seen corresponding path program 28 times [2022-11-19 07:33:25,138 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:33:25,138 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1892568080] [2022-11-19 07:33:25,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:33:25,138 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:33:25,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:33:28,474 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 532 proven. 309 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:33:28,474 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:33:28,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1892568080] [2022-11-19 07:33:28,474 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1892568080] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:33:28,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1513064451] [2022-11-19 07:33:28,475 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:33:28,475 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:33:28,475 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:33:28,476 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:33:28,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-19 07:33:28,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:33:28,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 344 conjuncts, 92 conjunts are in the unsatisfiable core [2022-11-19 07:33:28,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:33:30,943 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:33:30,943 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:33:36,864 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:33:36,864 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1513064451] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:33:36,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [682079468] [2022-11-19 07:33:36,865 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:33:36,866 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:33:36,866 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:33:36,866 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:33:36,866 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:33:36,956 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:33:38,158 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20848#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:33:38,158 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:33:38,159 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:33:38,159 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 113 [2022-11-19 07:33:38,159 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020652650] [2022-11-19 07:33:38,159 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:33:38,160 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2022-11-19 07:33:38,160 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:33:38,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2022-11-19 07:33:38,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1854, Invalid=12188, Unknown=0, NotChecked=0, Total=14042 [2022-11-19 07:33:38,162 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand has 113 states, 113 states have (on average 2.088495575221239) internal successors, (236), 113 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 07:33:58,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:33:58,989 INFO L93 Difference]: Finished difference Result 242 states and 267 transitions. [2022-11-19 07:33:58,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2022-11-19 07:33:58,990 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 113 states have (on average 2.088495575221239) internal successors, (236), 113 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 87 [2022-11-19 07:33:58,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:33:58,990 INFO L225 Difference]: With dead ends: 242 [2022-11-19 07:33:58,991 INFO L226 Difference]: Without dead ends: 174 [2022-11-19 07:33:58,993 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 394 GetRequests, 189 SyntacticMatches, 0 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11315 ImplicationChecksByTransitivity, 26.0s TimeCoverageRelationStatistics Valid=5501, Invalid=37141, Unknown=0, NotChecked=0, Total=42642 [2022-11-19 07:33:58,994 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 501 mSDsluCounter, 497 mSDsCounter, 0 mSdLazyCounter, 4312 mSolverCounterSat, 577 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 501 SdHoareTripleChecker+Valid, 500 SdHoareTripleChecker+Invalid, 4889 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 577 IncrementalHoareTripleChecker+Valid, 4312 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2022-11-19 07:33:58,994 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [501 Valid, 500 Invalid, 4889 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [577 Valid, 4312 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2022-11-19 07:33:58,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2022-11-19 07:33:59,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 113. [2022-11-19 07:33:59,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 112 states have (on average 1.2053571428571428) internal successors, (135), 112 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 07:33:59,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 135 transitions. [2022-11-19 07:33:59,338 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 135 transitions. Word has length 87 [2022-11-19 07:33:59,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:33:59,338 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 135 transitions. [2022-11-19 07:33:59,338 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 113 states have (on average 2.088495575221239) internal successors, (236), 113 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 07:33:59,339 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 135 transitions. [2022-11-19 07:33:59,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-11-19 07:33:59,339 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:33:59,340 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 21, 21, 1, 1, 1, 1, 1] [2022-11-19 07:33:59,366 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-11-19 07:33:59,566 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:33:59,566 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:33:59,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:33:59,567 INFO L85 PathProgramCache]: Analyzing trace with hash 872395322, now seen corresponding path program 29 times [2022-11-19 07:33:59,567 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:33:59,567 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [772411775] [2022-11-19 07:33:59,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:33:59,571 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:33:59,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:34:02,993 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 590 proven. 335 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:34:02,994 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:34:02,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [772411775] [2022-11-19 07:34:02,994 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [772411775] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:34:02,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [294749248] [2022-11-19 07:34:02,994 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:34:02,994 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:34:02,994 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:34:02,995 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:34:02,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-19 07:34:03,127 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2022-11-19 07:34:03,128 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:34:03,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 80 conjunts are in the unsatisfiable core [2022-11-19 07:34:03,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:34:07,071 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 0 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:34:07,071 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:34:13,899 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 0 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:34:13,900 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [294749248] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:34:13,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [778784599] [2022-11-19 07:34:13,901 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:34:13,901 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:34:13,901 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:34:13,902 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:34:13,902 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:34:13,994 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:34:15,510 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22328#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:34:15,511 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:34:15,511 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:34:15,511 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 50, 50] total 144 [2022-11-19 07:34:15,511 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293292805] [2022-11-19 07:34:15,511 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:34:15,512 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 144 states [2022-11-19 07:34:15,512 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:34:15,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 144 interpolants. [2022-11-19 07:34:15,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2429, Invalid=19921, Unknown=0, NotChecked=0, Total=22350 [2022-11-19 07:34:15,514 INFO L87 Difference]: Start difference. First operand 113 states and 135 transitions. Second operand has 144 states, 144 states have (on average 1.8611111111111112) internal successors, (268), 144 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:34:32,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:34:32,519 INFO L93 Difference]: Finished difference Result 187 states and 210 transitions. [2022-11-19 07:34:32,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-11-19 07:34:32,520 INFO L78 Accepts]: Start accepts. Automaton has has 144 states, 144 states have (on average 1.8611111111111112) internal successors, (268), 144 states have internal predecessors, (268), 0 states have call successors, (0), 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 91 [2022-11-19 07:34:32,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:34:32,521 INFO L225 Difference]: With dead ends: 187 [2022-11-19 07:34:32,521 INFO L226 Difference]: Without dead ends: 116 [2022-11-19 07:34:32,523 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10359 ImplicationChecksByTransitivity, 27.2s TimeCoverageRelationStatistics Valid=4315, Invalid=34691, Unknown=0, NotChecked=0, Total=39006 [2022-11-19 07:34:32,524 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 195 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 2236 mSolverCounterSat, 421 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 2657 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 421 IncrementalHoareTripleChecker+Valid, 2236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:34:32,524 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [195 Valid, 84 Invalid, 2657 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [421 Valid, 2236 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-11-19 07:34:32,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2022-11-19 07:34:32,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 113. [2022-11-19 07:34:32,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 112 states have (on average 1.1964285714285714) internal successors, (134), 112 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:34:32,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 134 transitions. [2022-11-19 07:34:32,788 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 134 transitions. Word has length 91 [2022-11-19 07:34:32,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:34:32,789 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 134 transitions. [2022-11-19 07:34:32,789 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 144 states, 144 states have (on average 1.8611111111111112) internal successors, (268), 144 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:34:32,789 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 134 transitions. [2022-11-19 07:34:32,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-11-19 07:34:32,789 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:34:32,789 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 21, 21, 1, 1, 1, 1, 1] [2022-11-19 07:34:32,800 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-11-19 07:34:32,990 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-11-19 07:34:32,990 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:34:32,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:34:32,990 INFO L85 PathProgramCache]: Analyzing trace with hash 744959578, now seen corresponding path program 30 times [2022-11-19 07:34:32,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:34:32,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1730194582] [2022-11-19 07:34:32,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:34:32,991 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:34:33,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:34:34,555 INFO L134 CoverageAnalysis]: Checked inductivity of 948 backedges. 231 proven. 717 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:34:34,555 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:34:34,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1730194582] [2022-11-19 07:34:34,555 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1730194582] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:34:34,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [531383626] [2022-11-19 07:34:34,555 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:34:34,555 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:34:34,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:34:34,557 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:34:34,559 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-19 07:34:34,667 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:34:34,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:34:34,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 75 conjunts are in the unsatisfiable core [2022-11-19 07:34:34,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:34:36,140 INFO L134 CoverageAnalysis]: Checked inductivity of 948 backedges. 0 proven. 948 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:34:36,140 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:34:38,040 INFO L134 CoverageAnalysis]: Checked inductivity of 948 backedges. 0 proven. 948 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:34:38,041 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [531383626] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:34:38,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2010383262] [2022-11-19 07:34:38,042 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:34:38,043 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:34:38,043 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:34:38,043 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:34:38,043 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:34:38,135 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:34:38,963 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23593#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:34:38,963 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:34:38,963 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:34:38,963 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 95 [2022-11-19 07:34:38,964 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85945079] [2022-11-19 07:34:38,964 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:34:38,964 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 95 states [2022-11-19 07:34:38,964 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:34:38,965 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2022-11-19 07:34:38,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1480, Invalid=8620, Unknown=0, NotChecked=0, Total=10100 [2022-11-19 07:34:38,966 INFO L87 Difference]: Start difference. First operand 113 states and 134 transitions. Second operand has 95 states, 95 states have (on average 1.4947368421052631) internal successors, (142), 95 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:34:42,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:34:42,102 INFO L93 Difference]: Finished difference Result 186 states and 208 transitions. [2022-11-19 07:34:42,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-11-19 07:34:42,102 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 95 states have (on average 1.4947368421052631) internal successors, (142), 95 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 92 [2022-11-19 07:34:42,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:34:42,103 INFO L225 Difference]: With dead ends: 186 [2022-11-19 07:34:42,103 INFO L226 Difference]: Without dead ends: 184 [2022-11-19 07:34:42,104 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 201 SyntacticMatches, 22 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7205 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=3523, Invalid=17939, Unknown=0, NotChecked=0, Total=21462 [2022-11-19 07:34:42,105 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 319 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 1057 mSolverCounterSat, 175 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 319 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 1232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 175 IncrementalHoareTripleChecker+Valid, 1057 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-19 07:34:42,105 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [319 Valid, 73 Invalid, 1232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [175 Valid, 1057 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-19 07:34:42,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2022-11-19 07:34:42,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 96. [2022-11-19 07:34:42,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 95 states have (on average 1.0210526315789474) internal successors, (97), 95 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 07:34:42,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 97 transitions. [2022-11-19 07:34:42,309 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 97 transitions. Word has length 92 [2022-11-19 07:34:42,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:34:42,310 INFO L495 AbstractCegarLoop]: Abstraction has 96 states and 97 transitions. [2022-11-19 07:34:42,310 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 95 states, 95 states have (on average 1.4947368421052631) internal successors, (142), 95 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:34:42,310 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 97 transitions. [2022-11-19 07:34:42,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-11-19 07:34:42,310 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:34:42,311 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 22, 22, 1, 1, 1, 1, 1] [2022-11-19 07:34:42,316 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-11-19 07:34:42,511 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:34:42,511 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:34:42,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:34:42,512 INFO L85 PathProgramCache]: Analyzing trace with hash 999595012, now seen corresponding path program 31 times [2022-11-19 07:34:42,512 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:34:42,512 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1251664318] [2022-11-19 07:34:42,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:34:42,512 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:34:42,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:34:46,254 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 651 proven. 362 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:34:46,255 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:34:46,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1251664318] [2022-11-19 07:34:46,255 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1251664318] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:34:46,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [374937154] [2022-11-19 07:34:46,256 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:34:46,256 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:34:46,256 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:34:46,259 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:34:46,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-11-19 07:34:46,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:34:46,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 100 conjunts are in the unsatisfiable core [2022-11-19 07:34:46,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:34:48,927 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 0 proven. 1013 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:34:48,927 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:34:55,549 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 0 proven. 1013 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:34:55,550 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [374937154] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:34:55,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [882611893] [2022-11-19 07:34:55,551 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:34:55,551 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:34:55,551 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:34:55,552 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:34:55,552 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:34:55,647 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:34:56,886 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24862#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:34:56,886 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:34:56,886 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:34:56,886 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 50] total 123 [2022-11-19 07:34:56,886 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154065540] [2022-11-19 07:34:56,887 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:34:56,887 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2022-11-19 07:34:56,887 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:34:56,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2022-11-19 07:34:56,890 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2187, Invalid=14325, Unknown=0, NotChecked=0, Total=16512 [2022-11-19 07:34:56,890 INFO L87 Difference]: Start difference. First operand 96 states and 97 transitions. Second operand has 123 states, 123 states have (on average 2.097560975609756) internal successors, (258), 123 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 07:35:20,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:35:20,171 INFO L93 Difference]: Finished difference Result 264 states and 291 transitions. [2022-11-19 07:35:20,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2022-11-19 07:35:20,172 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 2.097560975609756) internal successors, (258), 123 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 95 [2022-11-19 07:35:20,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:35:20,173 INFO L225 Difference]: With dead ends: 264 [2022-11-19 07:35:20,173 INFO L226 Difference]: Without dead ends: 190 [2022-11-19 07:35:20,175 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 207 SyntacticMatches, 0 SemanticMatches, 223 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13403 ImplicationChecksByTransitivity, 29.1s TimeCoverageRelationStatistics Valid=6500, Invalid=43900, Unknown=0, NotChecked=0, Total=50400 [2022-11-19 07:35:20,175 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 574 mSDsluCounter, 592 mSDsCounter, 0 mSdLazyCounter, 5279 mSolverCounterSat, 678 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 574 SdHoareTripleChecker+Valid, 595 SdHoareTripleChecker+Invalid, 5957 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 678 IncrementalHoareTripleChecker+Valid, 5279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:35:20,176 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [574 Valid, 595 Invalid, 5957 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [678 Valid, 5279 Invalid, 0 Unknown, 0 Unchecked, 4.1s Time] [2022-11-19 07:35:20,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2022-11-19 07:35:20,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 123. [2022-11-19 07:35:20,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.2049180327868851) internal successors, (147), 122 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 07:35:20,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 147 transitions. [2022-11-19 07:35:20,509 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 147 transitions. Word has length 95 [2022-11-19 07:35:20,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:35:20,509 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 147 transitions. [2022-11-19 07:35:20,509 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 2.097560975609756) internal successors, (258), 123 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 07:35:20,509 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 147 transitions. [2022-11-19 07:35:20,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-11-19 07:35:20,510 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:35:20,510 INFO L195 NwaCegarLoop]: trace histogram [24, 24, 23, 23, 1, 1, 1, 1, 1] [2022-11-19 07:35:20,524 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2022-11-19 07:35:20,725 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-11-19 07:35:20,725 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:35:20,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:35:20,725 INFO L85 PathProgramCache]: Analyzing trace with hash -1766066694, now seen corresponding path program 32 times [2022-11-19 07:35:20,725 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:35:20,726 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [106342325] [2022-11-19 07:35:20,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:35:20,726 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:35:20,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:35:24,455 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 715 proven. 390 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:35:24,455 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:35:24,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [106342325] [2022-11-19 07:35:24,456 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [106342325] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:35:24,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1321427972] [2022-11-19 07:35:24,456 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:35:24,456 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:35:24,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:35:24,457 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:35:24,463 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-19 07:35:24,620 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2022-11-19 07:35:24,620 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:35:24,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 389 conjuncts, 92 conjunts are in the unsatisfiable core [2022-11-19 07:35:24,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:35:29,945 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 0 proven. 1105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:35:29,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:35:37,804 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 0 proven. 1105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:35:37,804 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1321427972] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:35:37,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [740529747] [2022-11-19 07:35:37,805 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:35:37,806 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:35:37,806 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:35:37,806 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:35:37,806 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:35:37,891 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:35:39,240 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26478#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:35:39,240 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:35:39,240 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:35:39,240 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 56, 56] total 160 [2022-11-19 07:35:39,241 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107661914] [2022-11-19 07:35:39,241 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:35:39,241 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 160 states [2022-11-19 07:35:39,242 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:35:39,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 160 interpolants. [2022-11-19 07:35:39,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2962, Invalid=24428, Unknown=0, NotChecked=0, Total=27390 [2022-11-19 07:35:39,245 INFO L87 Difference]: Start difference. First operand 123 states and 147 transitions. Second operand has 160 states, 160 states have (on average 1.825) internal successors, (292), 160 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:35:59,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:35:59,407 INFO L93 Difference]: Finished difference Result 203 states and 228 transitions. [2022-11-19 07:35:59,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-11-19 07:35:59,408 INFO L78 Accepts]: Start accepts. Automaton has has 160 states, 160 states have (on average 1.825) internal successors, (292), 160 states have internal predecessors, (292), 0 states have call successors, (0), 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 99 [2022-11-19 07:35:59,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:35:59,409 INFO L225 Difference]: With dead ends: 203 [2022-11-19 07:35:59,409 INFO L226 Difference]: Without dead ends: 126 [2022-11-19 07:35:59,412 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 184 SyntacticMatches, 0 SemanticMatches, 217 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13007 ImplicationChecksByTransitivity, 31.7s TimeCoverageRelationStatistics Valid=5256, Invalid=42486, Unknown=0, NotChecked=0, Total=47742 [2022-11-19 07:35:59,412 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 334 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 3224 mSolverCounterSat, 460 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 334 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 3684 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 460 IncrementalHoareTripleChecker+Valid, 3224 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-11-19 07:35:59,413 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [334 Valid, 104 Invalid, 3684 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [460 Valid, 3224 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2022-11-19 07:35:59,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-11-19 07:35:59,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 123. [2022-11-19 07:35:59,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.1967213114754098) internal successors, (146), 122 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:35:59,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 146 transitions. [2022-11-19 07:35:59,785 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 146 transitions. Word has length 99 [2022-11-19 07:35:59,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:35:59,785 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 146 transitions. [2022-11-19 07:35:59,786 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 160 states, 160 states have (on average 1.825) internal successors, (292), 160 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:35:59,786 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 146 transitions. [2022-11-19 07:35:59,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2022-11-19 07:35:59,787 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:35:59,787 INFO L195 NwaCegarLoop]: trace histogram [25, 24, 23, 23, 1, 1, 1, 1, 1] [2022-11-19 07:35:59,799 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-11-19 07:35:59,994 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-11-19 07:35:59,994 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:35:59,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:35:59,994 INFO L85 PathProgramCache]: Analyzing trace with hash -428518886, now seen corresponding path program 33 times [2022-11-19 07:35:59,994 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:35:59,994 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [992497051] [2022-11-19 07:35:59,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:35:59,995 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:36:00,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:36:01,882 INFO L134 CoverageAnalysis]: Checked inductivity of 1130 backedges. 276 proven. 854 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:36:01,882 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:36:01,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [992497051] [2022-11-19 07:36:01,882 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [992497051] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:36:01,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1368368012] [2022-11-19 07:36:01,883 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:36:01,883 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:36:01,883 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:36:01,884 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:36:01,887 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-19 07:36:02,002 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:36:02,002 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:36:02,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 81 conjunts are in the unsatisfiable core [2022-11-19 07:36:02,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:36:03,684 INFO L134 CoverageAnalysis]: Checked inductivity of 1130 backedges. 0 proven. 1130 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:36:03,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:36:05,798 INFO L134 CoverageAnalysis]: Checked inductivity of 1130 backedges. 0 proven. 1130 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:36:05,798 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1368368012] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:36:05,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2114690788] [2022-11-19 07:36:05,799 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:36:05,799 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:36:05,799 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:36:05,800 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:36:05,800 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:36:05,897 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:36:06,901 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27855#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:36:06,901 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:36:06,901 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:36:06,901 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 103 [2022-11-19 07:36:06,901 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199763145] [2022-11-19 07:36:06,901 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:36:06,902 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2022-11-19 07:36:06,902 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:36:06,903 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2022-11-19 07:36:06,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1731, Invalid=10041, Unknown=0, NotChecked=0, Total=11772 [2022-11-19 07:36:06,905 INFO L87 Difference]: Start difference. First operand 123 states and 146 transitions. Second operand has 103 states, 103 states have (on average 1.4951456310679612) internal successors, (154), 103 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:36:10,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:36:10,367 INFO L93 Difference]: Finished difference Result 202 states and 226 transitions. [2022-11-19 07:36:10,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-11-19 07:36:10,367 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 1.4951456310679612) internal successors, (154), 103 states have internal predecessors, (154), 0 states have call successors, (0), 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 100 [2022-11-19 07:36:10,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:36:10,368 INFO L225 Difference]: With dead ends: 202 [2022-11-19 07:36:10,368 INFO L226 Difference]: Without dead ends: 200 [2022-11-19 07:36:10,371 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 219 SyntacticMatches, 24 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8483 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=4127, Invalid=20995, Unknown=0, NotChecked=0, Total=25122 [2022-11-19 07:36:10,372 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 385 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 1175 mSolverCounterSat, 215 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 385 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 1390 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 215 IncrementalHoareTripleChecker+Valid, 1175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-19 07:36:10,372 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [385 Valid, 73 Invalid, 1390 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [215 Valid, 1175 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-19 07:36:10,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2022-11-19 07:36:10,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 104. [2022-11-19 07:36:10,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.0194174757281553) internal successors, (105), 103 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 07:36:10,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 105 transitions. [2022-11-19 07:36:10,659 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 105 transitions. Word has length 100 [2022-11-19 07:36:10,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:36:10,660 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 105 transitions. [2022-11-19 07:36:10,660 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 1.4951456310679612) internal successors, (154), 103 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:36:10,660 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 105 transitions. [2022-11-19 07:36:10,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-11-19 07:36:10,660 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:36:10,661 INFO L195 NwaCegarLoop]: trace histogram [25, 25, 24, 24, 1, 1, 1, 1, 1] [2022-11-19 07:36:10,667 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-11-19 07:36:10,861 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-11-19 07:36:10,861 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:36:10,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:36:10,862 INFO L85 PathProgramCache]: Analyzing trace with hash -1358503868, now seen corresponding path program 34 times [2022-11-19 07:36:10,862 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:36:10,862 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1998847361] [2022-11-19 07:36:10,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:36:10,862 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:36:10,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:36:14,822 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 782 proven. 419 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:36:14,822 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:36:14,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1998847361] [2022-11-19 07:36:14,822 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1998847361] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:36:14,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1883242793] [2022-11-19 07:36:14,823 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:36:14,823 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:36:14,823 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:36:14,824 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:36:14,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-11-19 07:36:14,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:36:14,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 108 conjunts are in the unsatisfiable core [2022-11-19 07:36:14,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:36:17,868 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 0 proven. 1201 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:36:17,869 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:36:25,254 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 0 proven. 1201 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:36:25,255 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1883242793] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:36:25,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [108346092] [2022-11-19 07:36:25,256 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:36:25,256 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:36:25,256 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:36:25,256 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:36:25,257 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:36:25,367 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:36:26,664 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29232#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:36:26,664 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:36:26,665 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:36:26,665 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54, 54] total 133 [2022-11-19 07:36:26,665 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856508478] [2022-11-19 07:36:26,665 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:36:26,666 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 133 states [2022-11-19 07:36:26,666 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:36:26,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2022-11-19 07:36:26,668 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2548, Invalid=16634, Unknown=0, NotChecked=0, Total=19182 [2022-11-19 07:36:26,669 INFO L87 Difference]: Start difference. First operand 104 states and 105 transitions. Second operand has 133 states, 133 states have (on average 2.1052631578947367) internal successors, (280), 133 states have internal predecessors, (280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:36:54,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:36:54,702 INFO L93 Difference]: Finished difference Result 286 states and 315 transitions. [2022-11-19 07:36:54,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2022-11-19 07:36:54,703 INFO L78 Accepts]: Start accepts. Automaton has has 133 states, 133 states have (on average 2.1052631578947367) internal successors, (280), 133 states have internal predecessors, (280), 0 states have call successors, (0), 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 103 [2022-11-19 07:36:54,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:36:54,704 INFO L225 Difference]: With dead ends: 286 [2022-11-19 07:36:54,705 INFO L226 Difference]: Without dead ends: 206 [2022-11-19 07:36:54,709 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 225 SyntacticMatches, 0 SemanticMatches, 241 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15667 ImplicationChecksByTransitivity, 34.0s TimeCoverageRelationStatistics Valid=7583, Invalid=51223, Unknown=0, NotChecked=0, Total=58806 [2022-11-19 07:36:54,709 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 638 mSDsluCounter, 687 mSDsCounter, 0 mSdLazyCounter, 6106 mSolverCounterSat, 812 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 638 SdHoareTripleChecker+Valid, 690 SdHoareTripleChecker+Invalid, 6918 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 812 IncrementalHoareTripleChecker+Valid, 6106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2022-11-19 07:36:54,710 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [638 Valid, 690 Invalid, 6918 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [812 Valid, 6106 Invalid, 0 Unknown, 0 Unchecked, 4.8s Time] [2022-11-19 07:36:54,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2022-11-19 07:36:55,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 133. [2022-11-19 07:36:55,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.2045454545454546) internal successors, (159), 132 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 07:36:55,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 159 transitions. [2022-11-19 07:36:55,235 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 159 transitions. Word has length 103 [2022-11-19 07:36:55,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:36:55,235 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 159 transitions. [2022-11-19 07:36:55,236 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 133 states, 133 states have (on average 2.1052631578947367) internal successors, (280), 133 states have internal predecessors, (280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:36:55,236 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 159 transitions. [2022-11-19 07:36:55,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2022-11-19 07:36:55,236 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:36:55,236 INFO L195 NwaCegarLoop]: trace histogram [26, 26, 25, 25, 1, 1, 1, 1, 1] [2022-11-19 07:36:55,241 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-11-19 07:36:55,437 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-11-19 07:36:55,437 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:36:55,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:36:55,437 INFO L85 PathProgramCache]: Analyzing trace with hash 937585082, now seen corresponding path program 35 times [2022-11-19 07:36:55,438 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:36:55,438 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [753655898] [2022-11-19 07:36:55,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:36:55,438 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:36:55,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:36:59,851 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 852 proven. 449 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:36:59,851 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:36:59,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [753655898] [2022-11-19 07:36:59,852 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [753655898] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:36:59,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1449648950] [2022-11-19 07:36:59,852 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:36:59,852 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:36:59,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:36:59,853 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:36:59,856 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-11-19 07:37:00,017 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2022-11-19 07:37:00,017 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:37:00,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 419 conjuncts, 92 conjunts are in the unsatisfiable core [2022-11-19 07:37:00,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:37:05,737 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:37:05,737 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:37:14,631 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:37:14,631 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1449648950] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:37:14,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2036044315] [2022-11-19 07:37:14,632 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:37:14,633 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:37:14,633 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:37:14,633 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:37:14,633 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:37:14,741 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:37:16,245 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30976#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:37:16,245 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:37:16,246 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:37:16,246 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 58, 58] total 168 [2022-11-19 07:37:16,246 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018899086] [2022-11-19 07:37:16,246 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:37:16,246 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 168 states [2022-11-19 07:37:16,247 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:37:16,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 168 interpolants. [2022-11-19 07:37:16,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3273, Invalid=26829, Unknown=0, NotChecked=0, Total=30102 [2022-11-19 07:37:16,250 INFO L87 Difference]: Start difference. First operand 133 states and 159 transitions. Second operand has 168 states, 168 states have (on average 1.880952380952381) internal successors, (316), 168 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 07:37:39,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:37:39,479 INFO L93 Difference]: Finished difference Result 219 states and 246 transitions. [2022-11-19 07:37:39,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-11-19 07:37:39,480 INFO L78 Accepts]: Start accepts. Automaton has has 168 states, 168 states have (on average 1.880952380952381) internal successors, (316), 168 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 107 [2022-11-19 07:37:39,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:37:39,481 INFO L225 Difference]: With dead ends: 219 [2022-11-19 07:37:39,481 INFO L226 Difference]: Without dead ends: 136 [2022-11-19 07:37:39,485 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 432 GetRequests, 204 SyntacticMatches, 0 SemanticMatches, 228 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13995 ImplicationChecksByTransitivity, 36.6s TimeCoverageRelationStatistics Valid=5807, Invalid=46863, Unknown=0, NotChecked=0, Total=52670 [2022-11-19 07:37:39,486 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 252 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 3432 mSolverCounterSat, 468 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 252 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 3900 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 468 IncrementalHoareTripleChecker+Valid, 3432 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-11-19 07:37:39,486 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [252 Valid, 111 Invalid, 3900 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [468 Valid, 3432 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2022-11-19 07:37:39,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2022-11-19 07:37:39,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 133. [2022-11-19 07:37:39,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.196969696969697) internal successors, (158), 132 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 07:37:39,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 158 transitions. [2022-11-19 07:37:39,891 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 158 transitions. Word has length 107 [2022-11-19 07:37:39,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:37:39,892 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 158 transitions. [2022-11-19 07:37:39,892 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 168 states, 168 states have (on average 1.880952380952381) internal successors, (316), 168 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 07:37:39,892 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 158 transitions. [2022-11-19 07:37:39,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2022-11-19 07:37:39,892 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:37:39,892 INFO L195 NwaCegarLoop]: trace histogram [27, 26, 25, 25, 1, 1, 1, 1, 1] [2022-11-19 07:37:39,899 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2022-11-19 07:37:40,093 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-11-19 07:37:40,093 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:37:40,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:37:40,093 INFO L85 PathProgramCache]: Analyzing trace with hash -552753702, now seen corresponding path program 36 times [2022-11-19 07:37:40,093 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:37:40,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1825420293] [2022-11-19 07:37:40,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:37:40,094 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:37:40,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:37:42,256 INFO L134 CoverageAnalysis]: Checked inductivity of 1328 backedges. 325 proven. 1003 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:37:42,256 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:37:42,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1825420293] [2022-11-19 07:37:42,256 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1825420293] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:37:42,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [619504112] [2022-11-19 07:37:42,257 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:37:42,257 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:37:42,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:37:42,258 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:37:42,260 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-11-19 07:37:42,384 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:37:42,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:37:42,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 87 conjunts are in the unsatisfiable core [2022-11-19 07:37:42,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:37:44,321 INFO L134 CoverageAnalysis]: Checked inductivity of 1328 backedges. 0 proven. 1328 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:37:44,321 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:37:46,790 INFO L134 CoverageAnalysis]: Checked inductivity of 1328 backedges. 0 proven. 1328 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:37:46,790 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [619504112] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:37:46,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1046423359] [2022-11-19 07:37:46,791 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:37:46,791 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:37:46,791 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:37:46,791 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:37:46,791 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:37:46,870 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:37:47,976 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32461#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:37:47,977 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:37:47,977 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:37:47,977 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 111 [2022-11-19 07:37:47,977 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1281576394] [2022-11-19 07:37:47,977 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:37:47,977 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 111 states [2022-11-19 07:37:47,978 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:37:47,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2022-11-19 07:37:47,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2002, Invalid=11570, Unknown=0, NotChecked=0, Total=13572 [2022-11-19 07:37:47,979 INFO L87 Difference]: Start difference. First operand 133 states and 158 transitions. Second operand has 111 states, 111 states have (on average 1.4954954954954955) internal successors, (166), 111 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:37:51,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:37:51,927 INFO L93 Difference]: Finished difference Result 218 states and 244 transitions. [2022-11-19 07:37:51,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-11-19 07:37:51,928 INFO L78 Accepts]: Start accepts. Automaton has has 111 states, 111 states have (on average 1.4954954954954955) internal successors, (166), 111 states have internal predecessors, (166), 0 states have call successors, (0), 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 07:37:51,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:37:51,929 INFO L225 Difference]: With dead ends: 218 [2022-11-19 07:37:51,929 INFO L226 Difference]: Without dead ends: 216 [2022-11-19 07:37:51,930 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 432 GetRequests, 237 SyntacticMatches, 26 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9865 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=4779, Invalid=24291, Unknown=0, NotChecked=0, Total=29070 [2022-11-19 07:37:51,930 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 414 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 1357 mSolverCounterSat, 223 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 414 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 1580 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 223 IncrementalHoareTripleChecker+Valid, 1357 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-19 07:37:51,931 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [414 Valid, 78 Invalid, 1580 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [223 Valid, 1357 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-19 07:37:51,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2022-11-19 07:37:52,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 112. [2022-11-19 07:37:52,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 111 states have (on average 1.018018018018018) internal successors, (113), 111 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:37:52,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2022-11-19 07:37:52,189 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 108 [2022-11-19 07:37:52,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:37:52,189 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2022-11-19 07:37:52,189 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 111 states, 111 states have (on average 1.4954954954954955) internal successors, (166), 111 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:37:52,189 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2022-11-19 07:37:52,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2022-11-19 07:37:52,190 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:37:52,190 INFO L195 NwaCegarLoop]: trace histogram [27, 27, 26, 26, 1, 1, 1, 1, 1] [2022-11-19 07:37:52,195 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-11-19 07:37:52,390 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-11-19 07:37:52,391 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:37:52,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:37:52,391 INFO L85 PathProgramCache]: Analyzing trace with hash -176098172, now seen corresponding path program 37 times [2022-11-19 07:37:52,391 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:37:52,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [642254732] [2022-11-19 07:37:52,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:37:52,391 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:37:52,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:37:56,950 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 925 proven. 480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:37:56,950 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:37:56,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [642254732] [2022-11-19 07:37:56,951 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [642254732] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:37:56,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1252458459] [2022-11-19 07:37:56,951 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:37:56,951 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:37:56,951 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:37:56,952 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:37:56,955 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-11-19 07:37:57,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:37:57,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 434 conjuncts, 116 conjunts are in the unsatisfiable core [2022-11-19 07:37:57,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:38:00,386 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 0 proven. 1405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:38:00,386 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:38:09,095 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 0 proven. 1405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:38:09,095 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1252458459] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:38:09,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1031659280] [2022-11-19 07:38:09,096 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:38:09,097 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:38:09,097 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:38:09,097 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:38:09,097 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:38:09,191 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:38:10,559 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33946#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:38:10,560 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:38:10,560 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:38:10,560 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58, 58] total 143 [2022-11-19 07:38:10,560 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [784738669] [2022-11-19 07:38:10,560 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:38:10,560 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 143 states [2022-11-19 07:38:10,561 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:38:10,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2022-11-19 07:38:10,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2937, Invalid=19115, Unknown=0, NotChecked=0, Total=22052 [2022-11-19 07:38:10,564 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand has 143 states, 143 states have (on average 2.111888111888112) internal successors, (302), 143 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:38:42,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:38:42,621 INFO L93 Difference]: Finished difference Result 308 states and 339 transitions. [2022-11-19 07:38:42,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2022-11-19 07:38:42,622 INFO L78 Accepts]: Start accepts. Automaton has has 143 states, 143 states have (on average 2.111888111888112) internal successors, (302), 143 states have internal predecessors, (302), 0 states have call successors, (0), 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 111 [2022-11-19 07:38:42,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:38:42,623 INFO L225 Difference]: With dead ends: 308 [2022-11-19 07:38:42,623 INFO L226 Difference]: Without dead ends: 222 [2022-11-19 07:38:42,626 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 243 SyntacticMatches, 0 SemanticMatches, 259 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18107 ImplicationChecksByTransitivity, 39.4s TimeCoverageRelationStatistics Valid=8750, Invalid=59110, Unknown=0, NotChecked=0, Total=67860 [2022-11-19 07:38:42,626 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 709 mSDsluCounter, 799 mSDsCounter, 0 mSdLazyCounter, 6977 mSolverCounterSat, 930 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 709 SdHoareTripleChecker+Valid, 802 SdHoareTripleChecker+Invalid, 7907 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 930 IncrementalHoareTripleChecker+Valid, 6977 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:38:42,627 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [709 Valid, 802 Invalid, 7907 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [930 Valid, 6977 Invalid, 0 Unknown, 0 Unchecked, 5.2s Time] [2022-11-19 07:38:42,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2022-11-19 07:38:43,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 143. [2022-11-19 07:38:43,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.204225352112676) internal successors, (171), 142 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 07:38:43,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 171 transitions. [2022-11-19 07:38:43,317 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 171 transitions. Word has length 111 [2022-11-19 07:38:43,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:38:43,318 INFO L495 AbstractCegarLoop]: Abstraction has 143 states and 171 transitions. [2022-11-19 07:38:43,318 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 143 states, 143 states have (on average 2.111888111888112) internal successors, (302), 143 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:38:43,318 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 171 transitions. [2022-11-19 07:38:43,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2022-11-19 07:38:43,319 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:38:43,319 INFO L195 NwaCegarLoop]: trace histogram [28, 28, 27, 27, 1, 1, 1, 1, 1] [2022-11-19 07:38:43,326 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-11-19 07:38:43,525 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2022-11-19 07:38:43,525 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:38:43,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:38:43,526 INFO L85 PathProgramCache]: Analyzing trace with hash 1326386554, now seen corresponding path program 38 times [2022-11-19 07:38:43,526 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:38:43,526 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1059656966] [2022-11-19 07:38:43,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:38:43,526 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:38:43,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:38:48,438 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 1001 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:38:48,438 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:38:48,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1059656966] [2022-11-19 07:38:48,438 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1059656966] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:38:48,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1268883046] [2022-11-19 07:38:48,438 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:38:48,439 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:38:48,439 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:38:48,439 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:38:48,442 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-11-19 07:38:48,614 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2022-11-19 07:38:48,614 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:38:48,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 449 conjuncts, 105 conjunts are in the unsatisfiable core [2022-11-19 07:38:48,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:38:55,862 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 0 proven. 1513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:38:55,862 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:39:07,123 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 0 proven. 1513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:39:07,124 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1268883046] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:39:07,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [900487545] [2022-11-19 07:39:07,125 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:39:07,125 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:39:07,126 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:39:07,126 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:39:07,126 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:39:07,219 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:39:08,796 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35826#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:39:08,796 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:39:08,796 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:39:08,796 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 64, 64] total 184 [2022-11-19 07:39:08,797 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [51431631] [2022-11-19 07:39:08,797 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:39:08,797 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 184 states [2022-11-19 07:39:08,797 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:39:08,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 184 interpolants. [2022-11-19 07:39:08,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3887, Invalid=32023, Unknown=0, NotChecked=0, Total=35910 [2022-11-19 07:39:08,800 INFO L87 Difference]: Start difference. First operand 143 states and 171 transitions. Second operand has 184 states, 184 states have (on average 1.8478260869565217) internal successors, (340), 184 states have internal predecessors, (340), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:39:39,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:39:39,359 INFO L93 Difference]: Finished difference Result 235 states and 264 transitions. [2022-11-19 07:39:39,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-11-19 07:39:39,359 INFO L78 Accepts]: Start accepts. Automaton has has 184 states, 184 states have (on average 1.8478260869565217) internal successors, (340), 184 states have internal predecessors, (340), 0 states have call successors, (0), 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 115 [2022-11-19 07:39:39,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:39:39,360 INFO L225 Difference]: With dead ends: 235 [2022-11-19 07:39:39,360 INFO L226 Difference]: Without dead ends: 146 [2022-11-19 07:39:39,364 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 216 SyntacticMatches, 0 SemanticMatches, 250 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17215 ImplicationChecksByTransitivity, 46.6s TimeCoverageRelationStatistics Valid=6937, Invalid=56315, Unknown=0, NotChecked=0, Total=63252 [2022-11-19 07:39:39,364 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 345 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 4370 mSolverCounterSat, 655 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 345 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 5025 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 655 IncrementalHoareTripleChecker+Valid, 4370 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2022-11-19 07:39:39,365 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [345 Valid, 131 Invalid, 5025 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [655 Valid, 4370 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2022-11-19 07:39:39,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2022-11-19 07:39:39,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 143. [2022-11-19 07:39:39,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.1971830985915493) internal successors, (170), 142 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:39:39,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 170 transitions. [2022-11-19 07:39:39,848 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 170 transitions. Word has length 115 [2022-11-19 07:39:39,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:39:39,848 INFO L495 AbstractCegarLoop]: Abstraction has 143 states and 170 transitions. [2022-11-19 07:39:39,848 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 184 states, 184 states have (on average 1.8478260869565217) internal successors, (340), 184 states have internal predecessors, (340), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:39:39,849 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 170 transitions. [2022-11-19 07:39:39,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-11-19 07:39:39,849 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:39:39,849 INFO L195 NwaCegarLoop]: trace histogram [29, 28, 27, 27, 1, 1, 1, 1, 1] [2022-11-19 07:39:39,860 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-11-19 07:39:40,050 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:39:40,050 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:39:40,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:39:40,050 INFO L85 PathProgramCache]: Analyzing trace with hash 768354714, now seen corresponding path program 39 times [2022-11-19 07:39:40,050 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:39:40,051 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [504082376] [2022-11-19 07:39:40,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:39:40,051 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:39:40,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:39:42,515 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 378 proven. 1164 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:39:42,516 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:39:42,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [504082376] [2022-11-19 07:39:42,516 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [504082376] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:39:42,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [416226107] [2022-11-19 07:39:42,516 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:39:42,516 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:39:42,516 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:39:42,517 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:39:42,520 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-11-19 07:39:42,659 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:39:42,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:39:42,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 454 conjuncts, 93 conjunts are in the unsatisfiable core [2022-11-19 07:39:42,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:39:44,968 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 1542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:39:44,968 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:39:47,901 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 1542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:39:47,901 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [416226107] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:39:47,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1700654508] [2022-11-19 07:39:47,903 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:39:47,903 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:39:47,903 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:39:47,903 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:39:47,904 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:39:47,994 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:39:49,030 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '37425#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:39:49,030 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:39:49,030 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:39:49,031 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 119 [2022-11-19 07:39:49,031 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055866551] [2022-11-19 07:39:49,031 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:39:49,031 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 119 states [2022-11-19 07:39:49,032 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:39:49,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2022-11-19 07:39:49,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2293, Invalid=13207, Unknown=0, NotChecked=0, Total=15500 [2022-11-19 07:39:49,034 INFO L87 Difference]: Start difference. First operand 143 states and 170 transitions. Second operand has 119 states, 119 states have (on average 1.495798319327731) internal successors, (178), 119 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 07:39:53,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:39:53,831 INFO L93 Difference]: Finished difference Result 234 states and 262 transitions. [2022-11-19 07:39:53,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-11-19 07:39:53,832 INFO L78 Accepts]: Start accepts. Automaton has has 119 states, 119 states have (on average 1.495798319327731) internal successors, (178), 119 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 116 [2022-11-19 07:39:53,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:39:53,833 INFO L225 Difference]: With dead ends: 234 [2022-11-19 07:39:53,833 INFO L226 Difference]: Without dead ends: 232 [2022-11-19 07:39:53,836 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 464 GetRequests, 255 SyntacticMatches, 28 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11351 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=5479, Invalid=27827, Unknown=0, NotChecked=0, Total=33306 [2022-11-19 07:39:53,836 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 457 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 1515 mSolverCounterSat, 279 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 457 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 1794 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 279 IncrementalHoareTripleChecker+Valid, 1515 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:39:53,837 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [457 Valid, 91 Invalid, 1794 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [279 Valid, 1515 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-19 07:39:53,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2022-11-19 07:39:54,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 120. [2022-11-19 07:39:54,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 119 states have (on average 1.0168067226890756) internal successors, (121), 119 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 07:39:54,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 121 transitions. [2022-11-19 07:39:54,200 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 121 transitions. Word has length 116 [2022-11-19 07:39:54,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:39:54,201 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 121 transitions. [2022-11-19 07:39:54,201 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 119 states, 119 states have (on average 1.495798319327731) internal successors, (178), 119 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 07:39:54,201 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 121 transitions. [2022-11-19 07:39:54,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2022-11-19 07:39:54,202 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:39:54,202 INFO L195 NwaCegarLoop]: trace histogram [29, 29, 28, 28, 1, 1, 1, 1, 1] [2022-11-19 07:39:54,208 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2022-11-19 07:39:54,403 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:39:54,404 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:39:54,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:39:54,404 INFO L85 PathProgramCache]: Analyzing trace with hash -2115577660, now seen corresponding path program 40 times [2022-11-19 07:39:54,404 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:39:54,404 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [838984070] [2022-11-19 07:39:54,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:39:54,404 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:39:54,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:40:00,117 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 1080 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:40:00,117 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:40:00,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [838984070] [2022-11-19 07:40:00,117 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [838984070] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:40:00,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [743497698] [2022-11-19 07:40:00,117 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:40:00,118 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:40:00,118 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:40:00,119 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:40:00,121 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-11-19 07:40:00,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:40:00,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 464 conjuncts, 124 conjunts are in the unsatisfiable core [2022-11-19 07:40:00,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:40:04,384 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 0 proven. 1625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:40:04,384 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:40:14,562 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 0 proven. 1625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:40:14,562 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [743497698] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:40:14,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2065189061] [2022-11-19 07:40:14,564 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:40:14,564 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:40:14,564 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:40:14,564 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:40:14,565 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:40:14,687 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:40:16,479 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39018#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:40:16,479 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:40:16,479 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:40:16,479 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 62, 62] total 153 [2022-11-19 07:40:16,479 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872484505] [2022-11-19 07:40:16,480 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:40:16,480 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 153 states [2022-11-19 07:40:16,481 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:40:16,482 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 153 interpolants. [2022-11-19 07:40:16,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3354, Invalid=21768, Unknown=0, NotChecked=0, Total=25122 [2022-11-19 07:40:16,483 INFO L87 Difference]: Start difference. First operand 120 states and 121 transitions. Second operand has 153 states, 153 states have (on average 2.1176470588235294) internal successors, (324), 153 states have internal predecessors, (324), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:40:56,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:40:56,878 INFO L93 Difference]: Finished difference Result 330 states and 363 transitions. [2022-11-19 07:40:56,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 154 states. [2022-11-19 07:40:56,879 INFO L78 Accepts]: Start accepts. Automaton has has 153 states, 153 states have (on average 2.1176470588235294) internal successors, (324), 153 states have internal predecessors, (324), 0 states have call successors, (0), 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 119 [2022-11-19 07:40:56,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:40:56,881 INFO L225 Difference]: With dead ends: 330 [2022-11-19 07:40:56,881 INFO L226 Difference]: Without dead ends: 238 [2022-11-19 07:40:56,884 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 538 GetRequests, 261 SyntacticMatches, 0 SemanticMatches, 277 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20723 ImplicationChecksByTransitivity, 49.2s TimeCoverageRelationStatistics Valid=10001, Invalid=67561, Unknown=0, NotChecked=0, Total=77562 [2022-11-19 07:40:56,884 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 803 mSDsluCounter, 911 mSDsCounter, 0 mSdLazyCounter, 7990 mSolverCounterSat, 1057 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 803 SdHoareTripleChecker+Valid, 914 SdHoareTripleChecker+Invalid, 9047 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1057 IncrementalHoareTripleChecker+Valid, 7990 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.5s IncrementalHoareTripleChecker+Time [2022-11-19 07:40:56,885 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [803 Valid, 914 Invalid, 9047 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1057 Valid, 7990 Invalid, 0 Unknown, 0 Unchecked, 6.5s Time] [2022-11-19 07:40:56,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2022-11-19 07:40:57,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 153. [2022-11-19 07:40:57,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.2039473684210527) internal successors, (183), 152 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 07:40:57,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 183 transitions. [2022-11-19 07:40:57,502 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 183 transitions. Word has length 119 [2022-11-19 07:40:57,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:40:57,502 INFO L495 AbstractCegarLoop]: Abstraction has 153 states and 183 transitions. [2022-11-19 07:40:57,502 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 153 states, 153 states have (on average 2.1176470588235294) internal successors, (324), 153 states have internal predecessors, (324), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:40:57,502 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 183 transitions. [2022-11-19 07:40:57,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-11-19 07:40:57,503 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:40:57,503 INFO L195 NwaCegarLoop]: trace histogram [30, 30, 29, 29, 1, 1, 1, 1, 1] [2022-11-19 07:40:57,511 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2022-11-19 07:40:57,703 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2022-11-19 07:40:57,703 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:40:57,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:40:57,704 INFO L85 PathProgramCache]: Analyzing trace with hash -287448774, now seen corresponding path program 41 times [2022-11-19 07:40:57,704 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:40:57,704 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [23765595] [2022-11-19 07:40:57,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:40:57,705 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:40:57,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:41:03,707 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 1162 proven. 579 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:41:03,707 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:41:03,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [23765595] [2022-11-19 07:41:03,708 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [23765595] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:41:03,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [946034227] [2022-11-19 07:41:03,708 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:41:03,708 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:41:03,708 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:41:03,709 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:41:03,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-11-19 07:41:03,919 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2022-11-19 07:41:03,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:41:03,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 479 conjuncts, 104 conjunts are in the unsatisfiable core [2022-11-19 07:41:03,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:41:11,958 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 0 proven. 1741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:41:11,958 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:41:24,199 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 0 proven. 1741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:41:24,199 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [946034227] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:41:24,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1337430927] [2022-11-19 07:41:24,201 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-19 07:41:24,201 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:41:24,201 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:41:24,201 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:41:24,201 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:41:24,291 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:41:26,196 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '41026#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~n~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (< |ULTIMATE.start_main_~j~0#1| (ite (and (not (= (mod |ULTIMATE.start_main_~n~0#1| 2) 0)) (< |ULTIMATE.start_main_~n~0#1| 0)) (+ (div |ULTIMATE.start_main_~n~0#1| 2) 1) (div |ULTIMATE.start_main_~n~0#1| 2))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 07:41:26,196 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:41:26,196 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:41:26,197 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 66, 66] total 192 [2022-11-19 07:41:26,197 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727962220] [2022-11-19 07:41:26,197 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:41:26,198 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 192 states [2022-11-19 07:41:26,198 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:41:26,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 192 interpolants. [2022-11-19 07:41:26,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4245, Invalid=34761, Unknown=0, NotChecked=0, Total=39006 [2022-11-19 07:41:26,201 INFO L87 Difference]: Start difference. First operand 153 states and 183 transitions. Second operand has 192 states, 192 states have (on average 1.8958333333333333) internal successors, (364), 192 states have internal predecessors, (364), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:42:01,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:42:01,239 INFO L93 Difference]: Finished difference Result 251 states and 282 transitions. [2022-11-19 07:42:01,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2022-11-19 07:42:01,240 INFO L78 Accepts]: Start accepts. Automaton has has 192 states, 192 states have (on average 1.8958333333333333) internal successors, (364), 192 states have internal predecessors, (364), 0 states have call successors, (0), 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 123 [2022-11-19 07:42:01,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:42:01,241 INFO L225 Difference]: With dead ends: 251 [2022-11-19 07:42:01,242 INFO L226 Difference]: Without dead ends: 156 [2022-11-19 07:42:01,247 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 236 SyntacticMatches, 0 SemanticMatches, 260 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18175 ImplicationChecksByTransitivity, 53.5s TimeCoverageRelationStatistics Valid=7523, Invalid=60859, Unknown=0, NotChecked=0, Total=68382 [2022-11-19 07:42:01,247 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 279 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 4523 mSolverCounterSat, 602 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 279 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 5125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 602 IncrementalHoareTripleChecker+Valid, 4523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2022-11-19 07:42:01,248 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [279 Valid, 130 Invalid, 5125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [602 Valid, 4523 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2022-11-19 07:42:01,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2022-11-19 07:42:01,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 153. [2022-11-19 07:42:01,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.1973684210526316) internal successors, (182), 152 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:42:01,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 182 transitions. [2022-11-19 07:42:01,972 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 182 transitions. Word has length 123 [2022-11-19 07:42:01,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:42:01,973 INFO L495 AbstractCegarLoop]: Abstraction has 153 states and 182 transitions. [2022-11-19 07:42:01,973 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 192 states, 192 states have (on average 1.8958333333333333) internal successors, (364), 192 states have internal predecessors, (364), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:42:01,973 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 182 transitions. [2022-11-19 07:42:01,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-11-19 07:42:01,973 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:42:01,974 INFO L195 NwaCegarLoop]: trace histogram [31, 30, 29, 29, 1, 1, 1, 1, 1] [2022-11-19 07:42:01,980 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-11-19 07:42:02,174 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99592050-d460-4916-aed2-ddae267d048f/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:42:02,174 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 07:42:02,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:42:02,175 INFO L85 PathProgramCache]: Analyzing trace with hash -984818342, now seen corresponding path program 42 times [2022-11-19 07:42:02,175 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:42:02,175 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1151367721] [2022-11-19 07:42:02,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:42:02,175 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:42:02,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat